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Heat Pump Service. HEAT PUMPS TOTAL ELECTRIC UNIT CAPABLE OF PROVIDING HEATING AND COOLING MOVES HEAT WITH REFRIGERATION SYSTEM. CURRENT TECHNOLOGY ALLOWS.

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Presentation on theme: "Heat Pump Service. HEAT PUMPS TOTAL ELECTRIC UNIT CAPABLE OF PROVIDING HEATING AND COOLING MOVES HEAT WITH REFRIGERATION SYSTEM. CURRENT TECHNOLOGY ALLOWS."— Presentation transcript:

1 Heat Pump Service

2 HEAT PUMPS TOTAL ELECTRIC UNIT CAPABLE OF PROVIDING HEATING AND COOLING MOVES HEAT WITH REFRIGERATION SYSTEM. CURRENT TECHNOLOGY ALLOWS US TO ABSORB ENERGY FROM THE OUTDOOR AIR EFFICIENTLY, DOWN TO 20º.

3 During the winter months the heat pump absorbs heat from the outdoor air. Then releases the heat (energy) into the indoor air. There is energy (heat) present to minus 460º. Just as it is more efficient to move an object than it is to build or make one. It is more energy efficient to move heat, than generate it (depending on thermal/economic balance points).

4 Heat pumps are sized for the cooling demand of the application. The heat pump will be the sole source of cooling for the application. It may be the only source of heat, depending on heating requirements. Most areas of the country will also require an additional source of heat. This may be as little as a 5KW heat strip, or as much as a 80,000 BTU furnace. Well look at this in more detail later.

5 HEAT PUMPS COOLING SEASON –HEAT PUMP PERFORMS THE SAME AS ANY AIR CONDITIONING SYSTEM BY PICKING UP HEAT FROM THE SPACE TO BE CONDITIONED AND REJECTING IT OUTDOORS

6 HEAT PUMPS HEATING SEASON –UNIT ABSORBS HEAT FROM THE OUTDOOR AIR AND MOVES IT TO THE CONDITIONED SPACE –REVERSE-CYCLE AIR CONDITIONERS

7 HEAT PUMPS CLASSIFIED BY: THE SOURCE OF HEAT DURING THE HEATING CYCLE AND THE MEDIUM TO WHICH THE HEAT IS TRANSFERRED –AIR-TO- AIR –WATER-TO-AIR

8 INSIDE THE HEAT PUMP COMPRESSOR CAPABLE OF OPERATING AT LOW OUTDOOR TEMPERATURES INDOOR / OUTDOOR COIL DESIGN METERING DEVICE FOR INDOOR / OUTDOOR COIL REVERSING VALUE ( 4-WAY VALUE ) ACCUMULATOR CRANKCASE HEATER AUXILIARY HEAT EMERGENCY HEAT DEFROST CYCLE

9 HEAT PUMP ACCUMULATOR –CLIMATUFF - PART OF COMPRESSOR SHELL –LOCATED IN SUCTION LINE BETWEEN THE COMPRESSOR AND REVERSING VALUE –WHY HAVE ONE? MOST IMPORTANT: –HEATING CYCLE - COLD TEMPERATURES, OUT DOOR COIL MAY NOT BE ABLE TO EVAPORATE ALL THE REFRIGERANT –END OF DEFROST CYCLE –LIQUID CARRYOVER WILL BE CAUGHT BY THE ACCUMULATOR TO PREVENT COMPRESSOR DAMAGE

10 WHAT MAKES A HEAT PUMP UNIQUE SPECIAL COMPRESSOR MUCH HIGHER COMPRESSION RATIO MOST SEVERE APPLICATION HEAT PUMP COILS –ALTERNATELY FUNCTION AS EVAPORATOR AND CONDENSER –MUST TOLERATE CHARGE IMBALANCE –OUT DOOR COIL MUST BE DESIGNIED FOR EASY DEFROST

11 HEAT PUMP CRANKCASE HEATER –LOCATED ON COMPRESSOR, OLDER SYSTEMS USED COMPRESSOR WINDINGS. –RAISES TEMPERATURE OF OIL SO THAT THE ABSORPTION OF REFRIGERANT INTO THE COMPRESSOR IS KEPT TO A MINIMUM

12 COOLING CONDITION INDOOR COIL SAT. SUCT. T. 41F ENT. AIR T. 76F OUTDOOR COIL SAT. COND. T. 120F ENT. AIR T. 90F 4-WAY VALUE SUCT. P. 70 PSIG SUCT. T. 52F SUPERHEAT 11F DISCHARGE PRESSURE 260 PSIG METERING DEVICE SUBCOOLING 10F COMPRESSOR

13 HEATING CONDITIONS INDOOR COIL OUTDOOR COIL METERING DEVICE SUBCOOLING 10F SAT. COND. T. 95F ENT. AIR T. 70F SAT. SUCT. T. 20F ENT. AIR T. 45F 4-WAY VALUE DISCHARGE PRESSURE 182 PSIG METERING DEVICE SUBCOOLING 10F SUCT. P. 43 PSIG SUCT. T. 35F SUPERHEAT 10F COMPRESSOR

14 HEAT PUMP TOTAL HEAT REJECTED EQUALS HEAT ABSORBED + HEAT OF COMPRESSOR

15 THE REVERSING VALUE CONTROLS THE DIRECTION THE REFRIGERANT FLOWS HEAT PUMP

16 COOLING CONDITION INDOOR COIL SAT. SUCT. T. 41F ENT. AIR T. 76F OUTDOOR COIL SAT. COND. T. 120F ENT. AIR T. 90F 4-WAY VALUE SUCT. P. 70 PSIG SUCT. T. 52F SUPERHEAT 11F DISCHARGE PRESSURE 260 PSIG METERING DEVICE SUBCOOLING 10F COMPRESSOR

17 HEATING CONDITIONS INDOOR COIL OUTDOOR COIL METERING DEVICE SUBCOOLING 10F SAT. COND. T. 95F ENT. AIR T. 70F SAT. SUCT. T. 20F ENT. AIR T. 45F 4-WAY VALUE DISCHARGE PRESSURE 182 PSIG METERING DEVICE SUBCOOLING 10F SUCT. P. 43 PSIG SUCT. T. 35F SUPERHEAT 10F COMPRESSOR

18 Heat pump Thermostats Thermostats with adjustable heat anticipation need to have it adjusted for proper operation!

19 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NOR M TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA BAYSTAT239 OR 240 HEAT PUMP THERMOSTAT

20 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA Fault Indication Light

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22 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA Fault Indication Light SOV Energized In Cooling Brings On Compressor In Both Heating And Cooling

23 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA Fault Indication Light SOV Energized In Cooling Brings On Compressor In Both Heating And Cooling Energizes Auxiliary Heat When Unit Is In Defrost

24 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA Fault Indication Light SOV Energized In Cooling Brings On Compressor In Both Heating And Cooling Energizes Auxiliary Heat When Unit Is In Defrost Brings On Indoor Fan

25 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA Fault Indication Light SOV Energized In Cooling Brings On Compressor In Both Heating And Cooling Energizes Auxiliary Heat When Unit Is In Defrost Brings On Indoor Fan Part of Heat Anticipation Circuit (Used with Trane Electro-Mechanical Tstats

26 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA Fault Indication Light SOV Engerized In Cooling Brings On Compressor In Both Heating And Cooling Energizes Auxiliary Heat When Unit Is In Defrost Brings On Indoor Fan Part of Heat Anticipation Circuit (Used with Trane Electro-Mechanical Tstats This Is The Second Stage-Brings On The Electric Heat

27 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA Fault Indication Light SOV Engerized In Cooling Brings On Compressor In Both Heating And Cooling Energizes Auxiliary Heat When Unit Is In Defrost Brings On Indoor Fan Part of Heat Anticipation Circuit (Used with Trane Electro-Mechanical Tstats This Is The Second Stage-Brings On The Electric Heat Functions As An Internal Connection For The Blue Light

28 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA Fault Indication Light SOV Engerized In Cooling Brings On Compressor In Both Heating And Cooling Energizes Auxiliary Heat When Unit Is In Defrost Brings On Indoor Fan Part of Heat Anticipation Circuit (Used with Trane Electro-Mechanical Tstats This Is The Second Stage-Brings On The Electric Heat Functions As An Internal Connection For The Blue Light This Is The Common Side Of The Transformer

29 This Is The Other Side Of 24 Volts From The Transformer HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA Fault Indication Light SOV Engerized In Cooling Brings On Compressor In Both Heating And Cooling Energizes Auxiliary Heat When Unit Is In Defrost Brings On Indoor Fan Part of Heat Anticipation Circuit (Used with Trane Electro-Mechanical Tstats This Is The Second Stage-Brings On The Electric Heat Functions As An Internal Connection For The Blue Light This Is The Common Side Of The Transformer

30 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NOR M TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA BAYSTAT239 OR 240 HEAT PUMP THERMOSTAT

31 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA INDOOR UNIT R B G W1

32 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM FAN ON - ON C1 H1 ODA INDOOR UNIT R B G W1

33 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 N ORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA INDOOR UNIT R B G W1 BAYSTAT240A COOLING ON FAN - AUTO COOLING ON FAN - AUTO

34 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 N ORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA INDOOR UNIT R B G W1 BAYSTAT240A R Y X2 O BL Y O Defrost Board ODS-A R/W OUTDOOR UNIT COOLING ON FAN - AUTO

35 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 HEATING - ON - FIRST STAGE FAN - AUTO ODA 15 TO 22 VOLTS (T) FROM ODS-A TO (R)

36 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 N ORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA INDOOR UNIT R B G W1 BAYSTAT240A

37 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 N ORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA R Y X2 O BL Y O Defrost Board ODS-A R/W INDOOR UNIT R B G W1 OUTDOOR UNIT BAYSTAT240A

38 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 HEATING - ON - 2ND STAGE FAN - AUTO ODA 15 TO 22 VOLTS (T) FROM ODS-A TO (R)

39 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 NORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA 24 VOLT S (X2) FROM DEF. BRD 24 VOLT S (O) FROM DEF. BRD 15 TO 22 VOLTS (T) FROM ODS-A TO (R)

40 HEAT COOL F O Y X2 G T W U B R OFF RHS-1 N ORM TS SM-2 COOL HEAT RHS-2 FAN AUTO ON HA CA BL RD TSH NORM C1 H1 ODA INDOOR UNIT R B G W1 BAYSTAT240A HEATING ON EMERG. HTG (OPERATES 1.5° BELOW SETPOINT) FAN - AUTO

41 WHAT IS COOLING DROOP? Cooling droop is caused by the cooling anticipator heating up during the off cycle, causing the tstat to come on sooner, to help overcome the thermal lag of the system. This also provides night time cooling that helps keep humidity under control

42 DROOP (cont) Then there is Heating Droop. Heating Droop moves the temperature in the wrong direction. To compensate for this, the T circuit is added.

43 WHAT DOES THE T CIRCUIT HAVE TO DO WITH ANYTHING? The T circuit is a heat anticipation circuit that adds heat to the thermostat to slow down thermostat response, and removes heat to speed up the response.

44 T Circuit As the outdoor temperature drops, the resistance in the T, actually a thermistor (ODS-A), goes up. The higher the resistance, the less voltage is supplied to the resistor (ODA) located inside the thermostat. The less voltage to the ODA, the colder the tstat thinks it is.

45 RESISTANCE DEFROST THERMISTOR RESISTANCE OUTDOOR TEMPERATURE

46 V.047 W.036 W ODS-A -20°F.0034 A V

47 W V.046 W 0°F.036 W.069 W -20°F 13.6 V ODS-A.0034 A V ODS-A.0048 A V

48 W V.047 W 9.6 V.046 W 0°F.036 W.069 W ODS-A -20°F.0034 A V ODS-A.0048 A V 5 V ODS-A 30°F.0063 A V.119 W

49 W W 0°F -20°F 13.6 V V.046 W.031 W W.069 W ODS-A.0034 A V ODS-A.0048 A V 5 V ODS-A 30°F.0063 A V.119 W 2.2 V ODS-A 70°F.0073 A V.159 W

50 OD Motor BR/BL 230 VOLTS R Y RD/W BK O BL Y O TT AMB. COL SENSORS TSTAT SOV F Y O R X2 B COMPR T K1 K2 DEFROST BOARD DURING DEFROST

51 WHY IS THE BLUE LIGHT ON?

52 THE BLUE LIGHT IS AN INDICATION THAT THE AUXILIARY HEAT IS ON. It is on in several instances. –If the tstat is adjusted above set point. –If the outdoor temperature is below 40°F it will cycle off and on to maintain room temperature. If it stays on constantly above 30°F or cycles on when the outdoor temp. is above 50°F, the system should be checked.

53 WHY IS THE RED LIGHT ON STEADY?

54 The Red Light on steady is an indication the Emergency Heat Switch is on. The switch is used only if the heat pump is inoperative, but not due to a power failure. Using the heating in this mode will increase your power consumption. The red light is to remind the customer that the temperature is being controlled by resistance heat only.

55 THE RED LIGHT ON, BUT IT IS FLASHING The Emergency Heat switch is in the Normal position.

56 RED LIGHT FLASHING If the red light is flashing, this is an indication that the defrost board has detected a defrost fault. Reset by moving the Emergency Heat Switch to the on position for 30 seconds. If the flashing returns, service on the heat pump may be required.

57 HEAT PUMP REVERSING VALUE ILLUSTRATION

58 . TP-4. TP-3. TP-2. TP-1 SUCTION LINE INDOOR COILOUT DOOR COIL COMPRESSOR DISCHARGE

59 .... FROM OUTSIDE COIL TO ACCUMULATOR TO INDOOR COIL TP-4 TP-3 TP-2 TP-1 FROM COMPRESSOR DISCHARGE LINE HEATING MODE 5F MAX TEMP. DIFFERENCE

60 .. TP-4. TP TP-1... TP-3 TO OUTDOOR COIL TO ACCUMULATOR FROM INDOOR COIL FROM COMPRESSOR DISCHARGE LINE COOLING MODE 5F MAX TEMP. DIFFERENCE

61 HEAT PUMP METERING DEVICES –HEATING CYCLE, REFRIGERANT IS METERED TO THE OUTDOOR COIL –COOLING CYCLE, REFRIGERANT IS METERED TO THE INDOOR COIL

62 HEAT PUMP METERING DEVICES REFRIGERANT METERED TO COIL WHICH ABSORBS HEAT HEATING CYCLE REFRIGERANT METERED TO OUTDOOR COIL COOLING CYCLE REFRIGERANT METERED TO INDOOR COIL

63 METERING DEVICES CAPTUBE FIXED ORFICE TXV

64 METERING DEVICES CHECK VALVE SHUT CHECK VALUE OPEN METERING DEVICE METERING DEVICE FLOW IS METERED FLOW BYPASSES METERING DEVICE

65 The role of the defrost control To extract heat from the outdoor air, the heat pump must lower its outdoor coil temperature below that of the outdoor ambient. Depending on the humidity and temperature, frost may form on the outdoor coil. This frost will insulate the coil from the outdoor air, reducing its ability to absorb the heat from the outdoor air.

66 HEAT PUMP DEFROST CONTROLS - CONTROLS THE DEFROST CYCLE IN A HEAT PUMP DURING HEATING OPERATION. -THE DEFROST CONTROL CONTROLS THE FOLLOWING FUNCTIONS: 1 - SWITCH OVER VALVE OR REVERSING VALVE 2 - OUTDOOR FAN MOTOR 3 - ELECTRIC OR GAS AUX. HEAT 4 - INDICATES A FAULT HAS OCCURRED (OPTIONAL) -CONTROL THAT ESTABLISHES THE NEED FOR A DEFROST -BOTH TIMED AND DEMAND CONTROLS ARE USED TODAY -ELECTRO MECHANICAL TIMERS AND PRESSURE SWITCHES USED IN THE PAST

67 Heat pump defrost controls Several types of defrost controls have been used through the years. We will discuss their function and diagnostics of each type. The newer solid state and Demand Defrost controls will be the main focus of our time today.

68 As the frost accumulates on the outdoor coil, the systems capacity is reduced. Ö To remove the frost/ice from the outdoor coil, the system will shift itself into a variation the cooling mode. Ö During a defrost cycle the outdoor fan will stop, leaving the heat in the coil to remove the frost. Ö The type of defrost control system will dictate how much frost/ice is allowed to accumulate prior to initiating a defrost.

69 SYSTEM IN COOLING MODE- -ENERGIZE REVERSING VALVE –DIRECTS HOT GAS TO OUTDOOR COIL TO MELT THE FROST DEFROST CYCLE

70 DEFROST CONTROLS THE MUCH OLDER EQUIPMENT UTILIZED ELECTRO-MECHANICAL TIME CLOCKS. ELECTRONIC TIMER - TIME & TEMPERATURE DEFROST SOLID STATE - DEMAND DEFROST

71 DEFROST CYCLE TEMPERING INDOOR AIR –ELECTRIC HEAT IS TURNED ON TO TEMPER THE AIR DURING DEFROST CYCLE.

72 DEFROST CYCLE OUTDOOR FAN OFF –ENHANCES DEFROST

73 Electro-Mechanical systems çAll electro-mechanical systems are a time/temperature based control. çA predetermined amount of time must pass before a defrost cycle can be initiated. çAs mentioned earlier, the outdoor conditions have major impact on the amount of defrost needed. çThese systems are temperature activated as well.

74 Large amounts of frost may accumulate before the Time has elapsed. This results in lower seasonal efficiency. The reduced capacity will result with a greater dependence on a secondary heat source.

75 ELECTRONIC TIME-TEMPERATURE DEFROST CONTROL MINUTE COMPRESSOR RUN TIME SELECTION 10 MINUTE TIME OVERRIDE IN DEFROST CYCLE TWO TEST PINS - ADVANCES ELECTRONIC TIMER AND PUTS SYSTEM INTO DEFROST CYCLE FOR TESTING ON BOARD DEFROST RELAYS FOR OUTDOOR FAN, SOV VALVE AND AUXILIARY HEAT DEFROST TERMINATED ON TIME OR TEMPERATURE COMPRESSOR RUN TIME IS KEPT ONLY WHEN COIL THERMOSTAT IS CLOSED

76 The defrost thermostat is set to close at 25º. When the DT is closed, supplying 24 VAC to the D terminal, jumpering the test pins will speed up the internal clock. If you are testing the system, and have a jumper from R to D, remove the jumper as soon as the system shifts into defrost. To prevent excessive refrigerant pressures.

77 These controls will default to the 90 minute setting if the selector jumper is not connected. Which is how the equipment is shipped. I recommend one of the shorter time settings, 50 or 70 minutes. The water run off from a unit in defrost is pure water, and has never been reported to caused roof damage to date! Trying to catch the water could damage the outdoor coil (if the collected water froze and backed up under the coil).

78 TST EDR R R B B X2 Y O O D T

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85 There are several versions of these DFC boards. Many feature the exact same functions, with the only difference being the terminal for the defrost thermostat being labeled D or DT.

86 TST EDR R R B B X2 Y O O D T There are several versions of these DFC boards. Many feature the exact same functions, with the only difference being the terminal for the defrost thermostat being labeled D or DT.

87 TST EDR R R B B X2 Y O O D T There are several versions of these DFC boards. Many feature the exact same functions, with the only difference being the terminal for the defrost thermostat being labeled D or DT.

88 TST EDR R R B B X2 Y O O D T There are several versions of these DFC boards. Many feature the exact same functions, with the only difference being the terminal for the defrost thermostat being labeled D or DT.

89 TST EDR R R B B X2 Y O O D T There are several versions of these DFC boards. Many feature the exact same functions, with the only difference being the terminal for the defrost thermostat being labeled D or DT.

90 TST EDR R R B B X2 Y O O D T DFC CNT1152 OR CNT CNT1152 may be replaced by CNT K2 M1 M2 OD FAN K1 24V AC 24V COMMON INDOOR THERMOSTAT DT MS SC

91 DT SC TR TR1 EDC OR LPCO MS F G EDR DFC CNT1642 K1 K2 M1 M2 OD FAN TST EDR R R B B X2 Y O O DT T X2 YOTYOT INDOOR THERMOSTAT 24V AC 24V COMMON INDOOR THERMOSTAT COMMON FOR ELECTRIC HEATER ECONOMIZER (OPTIONAL)

92 TIMER DEFROST CONTROL

93 DEMAND DEFROST CONTROLS

94 DEMAND DEFROST FEATURES –ADAPTABILITY –LEARNING PROCESS –DEFROST ON DEMAND –DIAGNOSTICS –TIME OVERRIDE –SOFT SWITCHOVER

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96 DEMAND DEFROST CONTROLS

97 HEAT PUMP DEMAND DEFROST CONTROLS -TRANE DEMAND DEFROST CONTROLS OPERATE IN AN ADAPTIVE PROCESS TO OPTIMIZE THE HEAT PUMP PERFORMANCE. -THE DEMAND DEFROST CONTROL WILL ADAPT TO THE HEAT PUMP IT IS INSTALLED ON AND LEARN ITS OPTIMUM DEFROST CONDITIONS AND STORE THEM IN MEMORY. -THE DEMAND DEFROST CONTROL WILL ADJUST THE TIME BETWEEN DEFROST CYCLES TO MATCH THE WEATHER CONDITIONS.

98 HEAT PUMP DEMAND DEFROST CONTROLS - THE DEMAND DEFROST CONTROL WAS DEVELOPED BY TRANE IN 1984 AND IS PATENTED. -HEAT PUMP SYSTEMS WITH DEMAND DEFROST CONTROLS BENEFIT FROM A 6% HEATING SEASONAL PERFORMANCE FACTOR (HSPF) ADVANTAGE. -THERMISTOR SENSORS SENSE THE OUTDOOR AMBIENT TEMPERATURE AND OUTDOOR COIL TEMPERATURE. -THE DIFFERENCE BETWEEN THE OUTDOOR TEMPERATURE AND THE OUTDOOR COIL TEMPERATURE IS CALLED THE DELTA TEMPERATURE OR JUST DELTA-T.

99 The Defrost Cycle is Initiated As ice builds on the coil, the delta-t of the system increases until it reaches the initiate value, and the control starts the defrost process. The initiate value is not constant, but instead, is a value that the defrost control has learned will provide a fast, thorough defrost at a given outdoor temperature. Low initiate values waste energy by defrosting too often, while high initiate values fail to defrost the coils thoroughly. The control is continually varying the initiate value slightly to learn the best value. It measures the success of each initiate value by measuring the delta-t of the system during the next heating cycle.

100 DEFROST IS TERMINATED Once the temperature of the outdoor coil reaches the termination value, the defrost control turns on the outdoor fan. After waiting the soft-switch over time, it changes the switch over valve to the heating mode. This soft-switch over delay time, 12 seconds, gives the outdoor coil time to cool, reducing the refrigerant pressure and reducing the surge that occurs when the switch over valve is switched. If the compressor or Y cycles off during defrost, the switchover valve remains energized but the X2 output will be OFF. If Y cycles off during the soft-switchover time, the switchover valve is switched OFF immediately.

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108 Demand Defrost Control Operation Requirements for defrost initialization 1 - The outdoor temperature must be less than 52 F 2 -The coil temperature must be less than 33 F 3 -The Y line must be energized for a least 128 seconds 4 -The delta-T must be greater than the initiate temperature 5 - It must be time for a timed defrost minutes of run time have passed since the unit was first powered up

109 Demand Defrost Control Operation If the unit is placed into a forced defrost by placing the test jumper in the FRC DFT position and Y is energized, none of the above conditions need to be met. Defrost Controls groups 8 thru 21 have a 6 hour forced defrost below 6 degrees F outdoor temperature with a 3 minute timed override.

110 Requirements for Defrost Termination The coil temperature must exceed the terminate value. If the outdoor temperature is greater than 22 F, the terminate value is 47 F. If the outdoor temperature is less than 10 F, the terminate value is 35 F. If the outdoor temperature is between 10 F to 22 F, the terminate value is 25 F plus the outdoor temperature.OR The defrost control has a for 15 minute override time.

111 The Test Mode The control may be placed into a test mode by placing the RED jumper wire on the TST pin. This will cause the LED to blink rapidly and the operation of the control will be five times faster. The controller will run normally once the jumper is removed from the TST pin.

112 Fault Indications There are three types of faults the demand defrost control can experience. All three faults can cause the defrost control to change from a demand defrost control to a timed defrost control which defrosts the unit every 30 minutes. When the control goes into a timed defrost mode due to a FAULT A or FAULT C, on units that have the F line feature, it alerts the home owner by energizing the F line once every second which flashes a fault light on the thermostat. If the thermostat is switched to the emergency heat position, the F line will be energized, and the defrost control will be cleared of all faults after a few seconds.

113 Fault Indications FAULT A is indicated by 2 led flashes per second. FAULT A is caused by one of two conditions: 1 - During heating the system's delta-T is unusually low. (The capacity of the system is lower than it should be.) 2 - After 12 minutes of operation since the defrost termination, delta-T is greater than the initiate value. After running in a FAULT A condition for 30 minutes, the defrost control will indicate it by flashing the LED. After running 2 hours with this fault, the demand defrost control will then change to a timed defrost operation, and the homeowner will be notified via the F line.

114 Fault Indications FAULT A can be cleared by any one of the following operations: 1 - If the control has two normal defrost cycles (If the fault has been present long enough for the Fault light to start Flashing, it will flash until the first normal defrost.) 2 - If power is removed from the defrost control for more than 30 seconds. 3 - If the F line is energized for a few seconds.

115 Fault A

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124 Fault Indications FAULT B is indicated by 3 led flashes per second. FAULT B is caused by 10 successive failures of the heat pump to terminate on temperature during the defrost cycle. The unit will stop defrosting after 15 minutes due to the override timer. Once a FAULT B occurs, the control will indicate it by flashing the led. After FAULT B occurs 10 times, the control will act as a timer defrost control.

125 Fault Indications FAULT B can be cleared by any one of the following operations: 1 - If the control reaches the terminate value during one of the timed defrost cycles. (Since this fault is pretty common in cold climates with high winds, this fault does not alert the home owner via the F line.) 2 - If power is removed from the defrost control for more than 30 seconds. 3 - If the F line is energized for a few seconds.

126 Fault Indications FAULT C is indicated by 3 led flashes per second. FAULT C is caused by 15 successive faults in which the unit has an unusually high delta-T 15 minutes after a defrost termination. (Poor air flow over outdoor coils - they are probably blocked by ice.)

127 Fault Indications FAULT C can be cleared by any one of the following operations: 1 - If the unit has a normal delta-T 15 minutes after a defrost. (If the fault has been present long enough for the Fault light to start flashing, it will continue to flash until there is a defrost cycle without a high delta-T fault.) 2 - If power is removed from the defrost control for more than 30 seconds 3 -If the F line is energized for a few seconds

128 Fault B or C

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138 Combination Fault Indications FAULT A & FAULT B, indicated by 4 led flashes per second, is caused by 60 or more FAULT A's occurring and one or more FAULT B's occurring. FAULT A & FAULT C, indicated by 4 led flashes per second, is caused by 60 or more FAULT A's occurring and one or more FAULT C's occurring. Combination faults will notify the home owner by toggling the F line. Combination faults can be cleared by any one of the following operations: 1 - If the F line is energized for a few seconds 2 - If power is removed from the defrost control for more than 30 seconds

139 Power-up Initial Defrost After the defrost board is powered up, its first defrost cycle will be a timed cycle. On the newer boards, the unit must run during defrosting conditions for 30 minutes while some older boards must run for 45 minutes. Assuming there are no faults, subsequent defrost cycles will be performed on demand. The delay in each case can be reduced to 1/5 this time by placing the red jumper lead on the TST terminal.

140 Forcing the Unit to Defrost Placing the red jumper wire on the FRC DFT pin, the defrost board can be forced to initiate a defrost immediately even if outside temperature conditions are not met. The only requirement is that the compressor is running or the Y signal is present. The defrost will be terminated normally when the outdoor coil becomes hot enough. If the jumper is still on the FRC DFT lead upon defrost termination, it will initiate the defrost cycle again.

141 F Line Operation Full featured defrost controls (G15-G17 & G19-G20) have an F line to alert the home owner in the event of a fault. On older controls, the F line would continue to flash a fault to the home owner after the fault was gone, but newer boards stop flashing the Fault light after the faults A, B, and C have passed. This will hopefully cut down on nuisance service calls, and still yet alert the home owner if the heat pump fails.

142 No Fault Found DONT REPLACE IT! –If LED blinks, –& Sensors ohm out OK, –& Forced defrost works. Look Elsewhere For Cause(s) Package Unit Ambient Sensor Bracket –Added for better ambient sensing

143 ODS-A Thermistor Failures Cause –Field miswire during installation Solution –X2 wire color changed from BR/X2 to BK DO NOT REPLACE CONTROL –Use RES0118 ODS-A kit –Needed ONLY for GE blue light thermostat

144 Defrost Control Failures Early defrost controls would sometimes fail to defrost with the LED steady ON or OFF. If power is removed for 1 minute, the board will resume normal operation. After months of research at Trane and the microprocessor manufacturer, the mechanisms for this type of failure were discovered, and the new defrost boards were designed and tested to resist this type failure. Defrost controls manufactured after Jan have this improvement made.

145 Defrost Control Failures The second problem is caused by miswiring. Often, the anticipator lead has been confused with the X2 lead, because the leads were both brown. In current generation outdoor units the X2 lead is black, so the incidence of field miswiring should go down.

146 Temperature Sensors The temperature sensors are temperature dependent resistors encased in a heat-shrunk plastic shroud and sealed from air and moisture by a hot glue adhesive fill. The resistance of the sensor decreases as temperature increases according to a specified curve. See the temperature / resistance curve provided with the service information. It is rare for a temperature sensor to fail, and most that have been replaced in warranty were OK, or they had been damaged by rough handling.

147 Temperature Sensors A common problem with sensors is damage inflicted by forcing ohmmeter probes into their connectors. This permanently bends the contact causing an intermittent connection. On some package units, the sensor leads have been pinched by the access panel. Checking the sensor resistance to ground will detect this problem.

148 Check Out Procedure The following tests are to be performed to check for proper operation after installation of the demand defrost control. Step 1: Apply power to the system and operate in heating mode. The switchover valve should be off (heating mode), and the outdoor fan should be on. Step 2: Check to be sure the led on the defrost board is blinking once every second and the fault light on the thermostat is off. Step3: Force the system to defrost by placing the red jumper wire on the FRC DFT pin.

149 Check Out Procedure As the unit goes through the defrost process, the switchover valve should be energized, the auxiliary heat should be on and the outdoor fan motor should be off. Step 4: Monitor the system to be sure it stops defrost within 15 minutes. Step 5: At the end of the defrost cycle, the outdoor fan should come on, and after a 12 second delay, the unit will switch back to the heating mode.

150 Check Out Procedure Step 6: If the board has the fault light feature (G15-G17& G19-G20), test this feature by placing the red jumper wire on the FRC FLT pin for a few seconds then return the red jumper wire to the NORM pin. This should cause the led on the defrost board to blink four times a second, and the indoor fault indicator on the thermostat should be blinking once a second. Step 7: Switch the indoor thermostat to the emergency heating position for at least 30 seconds and then back to the heat pumps position. The indoor fault indicator should stop blinking and the LED should blink once a second indicating that everything is normal.

151 Helpful Hints in Case of Difficulty Led fails to blink on the defrost board If the led is off, check between R and B to be sure 24 volts is present. Remove power for one minute and re-apply power. Check to see if the LED starts flashing.

152 Helpful Hints in Case of Difficulty LED flashes, but the unit fails the forced defrost test. 1. Be sure the red jumper wire was returned to the NORM pin. 2. Make sure the thermostat is calling for heating (24 V on Y) 3. Verify that the sensors are connected and mounted in the right places 4. Check the electrical connections to the defrost board (24V on O while defrosting) 5. There is a 1 minute minimum time in defrost under normal operation. If defrost is forced there is no minimum time in defrost.

153 Helpful Hints in Case of Difficulty 1-The indoor fault indicator goes on and then goes off. During extreme weather conditions, the unit may have difficulty defrosting. This will cause a fault and alert the owner, but when the weather is more temperate, the fault will clear and the indicator will stop blinking. 2 -The outdoor sensor (ODS) is burnt on the defrost board. Check control wiring T and X2. On the newer units the X2 lead is black and this is not as likely to happen.

154 Demand Defrost Control Problems Excessive Ice Built-up on OD Coil Low refrigerant charge Defrost Control will not Initiate A. No 24 VAC between R&B at defrost control B.No 24 VAC between B&Y at defrost control with system running C.Verify correct sensor location, mounting & their resistance D.Verify ambient sensor is connected to AMB position on defrost control E.Verify coil sensor is connected to coil position on defrost control

155 Demand Defrost Control Problems Excessive Ice Built-up on OD Coil SOV Inoperative A.Stuck in heating mode B.Open switchover valve (SOV) coil C.Defective defrost control Defrost control contacts to OD fan fail to open during defrost cycle

156 Demand Defrost Control Problems Excessive Ice Built-up on OD Coil Defrost control terminates, but does not remove ice A.Windy conditions B.Outdoor unit located under eaves C.Lack of proper drainage D.Night setback operation

157 Ice Build Up on Lower Part of Outdoor Coil Low refrigerant charge Coil sensor connected to wrong pass of outdoor coil, or poor contact Leaking check valve (outdoor unit) Distributor tube restricted One pass of OD coil restricted Lack of proper drainage

158 Defrost Initiates, but Terminates Only on a Time Override Low refrigerant charge Outdoor fan on during defrost Windy conditions Night setback operation Unit location Coil sensor in contract with ice Coil sensor circuit open or reading very high resistance.

159 Defrost Cycle Initiates, but Will Not Terminate Defrost Control Switch-over valve stuck in cooling mode

160 Unit Goes Into Defrost In Cooling Mode Defective Sensors Defective Defrost Control

161 Control Terminates Defrost Before Frost Is Gone Coil sensor mounted in wrong location or has incorrect resistance reading Refrigerant overcharge

162 Defrost Initiates About Every 15 Minutes Coil sensor Ambient sensor Defrost control

163 Defrost Initiates About Every 30 Minutes. Fault Light on Indoor Thermostat Will Be Flashing If Wired Coil sensor Ambient sensor Weather conditions Night setback operation Outdoor fan on during defrost System refrigerant charge SOV operation

164 Two-Compressor Controllers Tyler Version For V.S. OD Fan Motor –Cooling model 21C150624G02, CNT2275 –Heatpump model 21C150625G02, CNT2276

165 Two-Compressor Controllers Ft. Smith Version for PSC Fan Motor –Cooling model 21C150624G01, CNT1858 –Heatpump model 21C150625G01, CNT1859

166 Heat Pump Control

167 EFFICIENCY EER COP SEER HSPF

168 EER BTUS OUT 39,000 BTU/HR. POWER IN 4380 WATTS/HR. =8.9 BTU/WATT

169 COP BTUS OUT 39,000 BTU/HR BTUS WE 4380 WATTS/HR X BTU/WATT PAY FOR = 2.6

170 COP FOR HEAT PUMP AND RESISTANCE HEAT OUTDOOR TEMPERATURE HEATING COP RESISTANCE HEAT HEAT PUMP

171 HSPF HEATING SEASONAL PERFORMANCE FACTOR TOTAL HEATING OUTPUT OF A HEAT PUMP DURING ITS NORMAL ANNUAL USAGE PERIOD FOR HEATING DIVIDED BY THE TOTAL ELECTRIC POWER INPUT IN WATT-HOURS DURING THE SAME PERIOD

172 SEER SEASONAL ENERGY EFFICIENCY RATIO TOTAL COOLING OF A CENTRAL UNITARY AIR CONDITIONER OR UNITARY HEAT PUMP IN BTUS DURING ITS NORMAL ANNUAL USAGE PERIOD FOR COOLING DIVIDED BY, THE TOTAL ELECTRIC POWER INPUT IN WATT- HOURS DURING THE SAME PERIOD

173 WHEN CAPACITY DROPS OUTDOOR TEMPERATURE EER&COP - CAPACITY - SUCTION - TEMPERATURE PRESSURE

174 WHAT CAUSES CAPACITY TO DROP GAS DENSITY DECREASES SHORTER EFFECTIVE STROKE DECREASED FLOW RATE =+

175 CAPACITY VS. HEAT LOSS CAPACITY TEMPERATURE UNIT CAPACITY HEAT LOSS SUPPLEMENTAL HEAT NEEDED

176 ELECTRIC HEAT SUPPLEMENTAL HEAT EMERGENCY HEAT AUXILIARY HEAT RESERVE HEAT

177 THERMAL BALANCE POINT HEAT LOSS HEATING CAPACITY = HEAT PUMP

178 CAPACITY VS. HEAT LOSS BTU/HR OUTDOOR TEMPERATURE 45,000 50F 21,000 HEAT LOSS UNIT CAPACITY 10F

179 BALANCE POINT HEAT LOSS UNIT CAPACITY BALANCE POINT OUTDOOR TEMPERATURE BTU/HR 34, F 65F

180 DESIGN POINT HEAT LOSS UNIT CAPACITY OUTDOOR TEMPERATURE BTU/HR 10F 57,500 21,000 DESIGN POINT NEED 36,500 BTU/HR ADDITIONAL

181 EMERGENCY HEAT HEAT LOSS UNIT CAPACITY 10F 57,500 BTU/HR OUTDOOR TEMPERATURE 57,500 X ,500 BTU/HR 3413 BTU/KW =16.8 KW

182 TOTAL CAPACITY WITH 17 KW HEATER PACKAGE UNIT CAPACITY 1 ST STAGE 2 ND STAGE 3 RD STAGE 19,340 BTU/HR (5.66KW) 19,340 BTU/HR

183 BALANCE POINT 1 ST STAGE ELECTRIC HEAT UNIT CAPACITY 1 ST STAGE OUTDOOR TEMPERATURE 22.5F HEAT LOSS BALANCE POINT

184 BALANCE POINT 2ND STAGE ELECTRIC HEAT UNIT CAPACITY 1 ST STAGE OUTDOOR TEMPERATURE HEAT LOSS BALANCE POINT 2 ND STAGE 13F

185 BALANCE POINT 3RD STAGE ELECTRIC HEAT UNIT CAPACITY 1 ST STAGE OUTDOOR TEMPERATURE HEAT LOSS 2 ND STAGE 3 RD STAGE BALANCE POINT 4F10F DESIGN POINT BTU/HR

186 Heat pump with heat strips This application has a 17KW heat strip. You will see that W2 heat strip is brought on during defrost. The W1 and W3 heat strips are controlled by outdoor thermostats. Only bringing them on as the outdoor temperature drops.

187 TO LINE VOLTAGE SUPPLY BR/RD PURPLE/WH BK/BL PURPLE/WHBLACK TDL SUMP HTR BK/BLRDBR MS-1 CSR-1 CSR CS OR BK/BL SRSR CPR IOL RD CR RD BR/RD BL/WHFAN MTR RED R B B O O Y Y X2 F Y1 RD YL YL BK BK CBS ODS-B BK/RD CF PURPLE BROWN BLACK OFT-B OFT-A LO HI

188 YL YL BK BK Y Y X2 FR B B O O RD T1 BLACK OR YL X BK X BK X HEATER CONTROLS BR BL RD TO POWER SUPPLY PER LOCAL CODES TYPICAL MANUAL CHANGE OVER THERMOSTAT TYPICAL AIR HANDLER O Y W3 W2 W1 J G T F O Y X2 G T W U B R B R RD/WH F YL BKOR RD BL WS ODS-A FAN CONTROL BD T T B R X2 Y O SM-1 HEAT OFF COOL HA CA TS RHS-1 SM-2 HEAT COOL RHS-2 FAN AUTO ON ODA TSH RD BL

189 EMERGENCY HEAT RELAY PACKAGE MAINTAINS COMFORT IF HEAT PUMP FAILS BY 1 LOCKING OUT COMPRESSOR 2 BYPASSING OUTDOOR THERMOSTAT 3 BRINGING ON FULL STRIP HEAT

190 SQUEEZING OUT OPERATIONG $ DECREASE BALANCE POINT –OVERSIZE HEAT PUMP –UPGRADE BUILDING INS. & GLAZING –TURN DOWN THE THERMOSTAT DUAL - ALTERNATIVE HEATING SYSTEM 2 - STAGE HEAT PUMP

191 LOCATING THE UNIT AIR CONSIDERATIONS –AVOID RECIRCULATION –CUT OFF PREVAILING WIND WATER DRAINAGE –ALLOW CLEARANCE FOR WATER DRAIN OFF SNOW CONSIDERATIONS –AVOID SNOW DRIFTS –RAISE UNIT IN HEAVY SNOW AREAS

192 AIR FLOW CHARGING LOAD CALCULATION CAPACITY

193 DUAL FUEL

194 HEATING ON CYCLE FOSSIL FUEL HEAT PUMP TIME TEMP

195 DUAL FUEL SYSTEMS DEPENDS ON THE COST OF ELECTRICITY AND PRICE OF THE FOSSIL FUEL LESS EXPENSIVE TO HEAT COMPRESSION- CYCLE EQUIPMENT WHEN THE OUTDOOR TEMPERATURE IS MILD TO MODERATELY COLD MORE ECONOMICAL TO HEAT WITH FOSSIL FUEL WHEN THE OUTDOOR TEMPERATURE IS VERY COLD REDUCES DEMAND FOR POWER DURING PERIODS OF COLD WEATHER

196 ECONOMIC BALANCE POINT OUTDOOR TEMPERATURE ASSOCIATED WITH EQUAL OPERATING COSTS

197 ADD-ON HEAT PUMP KIT TYPLUS103A SEQUENCE OF HEATING OPERATION NON-RESTRICTIVE MODE –FIRST STAGE HEAT, HEAT PUMP (ONLY) OPERATES IN HEATING, IF HEAT PUMP CANNOT HANDLE THE LOAD, WHEN THE TEMPERATURE IN ROOM DROPS APPROX. 1- 1/2F, FURTHER, SECOND STAGE HEAT IS CALLED FOR. SECOND STAGE TURNS THE HEAT PUMP OFF AND BRINGS THE FURNACE ON. FURNACE WILL SATISFY SECOND STAGE ONLY. FIRST STAGE IF CALLING WILL OPERATE AFTER 45 SEC. DELAY –THERMOSTAT EMERGENCY HEAT POSITION OPERATES FURNACE ONLY

198 SEQUENCE OF HEATING OPERATION RESTRICTIVE MODE - ( REQUIRES TAYSTAT250A ) –O.D.T. CHANGEOVER AT OR ABOVE ECONOMIC BALANCE POINT –TEMPERATURES ABOVE O.D.T.,HEAT PUMP ONLY,WHEN CALLED BY FIRST STAGE STAT. –TEMPERATURES BELOW O.D.T.,FIRST STAGE STAT. GOES TO THE FURNACE AND HEAT PUMP IS CUT OFF –EMERGENCY HEAT POSITION CONVERTS SYSTEM TO FURNACE ONLY OPERATION ADD-ON HEAT PUMP KIT TYPLUS103A

199 AIR FLOW SUPPLY DUCT UPFLOW FURNACE NOTE 1 A COIL UPFLOW APPLICATION CLASS 2 LOW VOLTAGE WIRING TO SYSTEM CONTROLLER COIL ENCLOSURE BONNET THERMOSTAT A COIL FRONT COIL BAFFLE NOTE: 1. MOUNT BONNET THERMOSTAT THROUGH FRONT COIL BAFFLE AT THE HIGHEST PRACTICAL POINT INSIDE THE A COIL SO THE SENSING ELEMENT DOES NOT TOUCH EITHER SLAB OF COIL OR INTERFERE WITH TUBING.

200 T O R W Y B X2 G G W1 W2 R B Y FIELD WIRING DIAGRAM FOR SPLIT HEAT PUMP SYSTEM WITH TAYPLUS103A CONTROL IN FURNACE (UNRESTRICTED MODE) ROOM THERMOSTAT INTER-COMPONENT WIRING 24 V. FACTORY LINE V. WIRING 24 V. FIELD LINE V. WIRING FIELD INSTALLED FACTORY WIRING HEAT PUMP O.D. SECTION BR T OR O YL Y RD R BL B BR/X2 OR BK X2 3 PH. ONLY TO POWER SUPPLY PER LOCAL CODES LEGEND TDR - TIME DELAY RELAY MODEL RLY1664 K - RELAY MODEL RLY1663 BT - BONNET THERMOSTAT MODEL THT1248 W3 Y3 X3 G3 G1 K1-3 K1-2 K1 TDR TDR - 1 K1-1 Y2 X2 Y1 B W1 BT 3 PH. ONLY TO POWER SUPPLY PER LOCAL CODES TAYPLUS103A FURNACE

201 T O R W Y B X2 G G W1 W2 R B Y FIELD WIRING DIAGRAM FOR SPLIT HEAT PUMP SYSTEM WITH TAYPLUS103A CONTROL IN FURNACE (RESTRICTED MODE) ROOM THERMOSTAT INTER-COMPONENT WIRING 24 V. FACTORY LINE V. WIRING 24 V. FIELD LINE V. WIRING FIELD INSTALLED FACTORY WIRING HEAT PUMP O.D. SECTION BR T OR O YL Y RD R BL B BR/X2 OR BK X2 3 PH. ONLY TO POWER SUPPLY PER LOCAL CODES LEGEND TDR - TIME DELAY RELAY MODEL RLY1664 K - RELAY MODEL RLY1663 BT - BONNET THERMOSTAT MODEL THT1248 W3 Y3 X3 G3 G1 K1-3 K1-2 K1 TDR TDR - 1 K1-1 Y2 X2 Y1 B W1 BT 3 PH. ONLY TO POWER SUPPLY PER LOCAL CODES TAYPLUS103A FURNACE ODT

202 Component failures Components that fail after 30 days of operation, but prematurely. A 2 year old compressor or fan motor. If a component last for 100 hours of operation, but not 10,000 hours, odds are it is a symptom of another yet undiagnosed problem!

203 Mechanical problems that cause electrical failures Failure of start components or compressor? Compressor starting with liquid present! Overcharged unit. Crankcase heater circuit failure. Cycle rate too short, superheat never stabilizing. Low supply voltage is the least common, and most often assumed.

204 Things we need to get better at Gathering information from the consumer. Looking beyond the failure in front of us, why did it fail. Shit does not just happen! Charging, letting the system run long enough to stabilize. Taking subcooling and superheat. Remembering that over 50% of the electronic controls replaced didnt need to be replaced!

205 The MOST important thing to remember Trane technicians are proven to be the best!

206 The End Thank you


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