1. PACKAGE UNITS
GPG 10 AND 12 SEER

2. TECHNICAL SUPPORT
MARK STOKES
EXT. 630

3. Model Number Chart

4. 09 is for the month it was built 04 is for the year it was built
SERIAL NUMBER
09 is for the month it was built
04 is for the year it was built

5. 12 & 10 SEER Packaged Gas Electric
Fits in a standard size Pickup!
47” Wide

6. 12 & 10 SEER Packaged Gas Electric
Cooling Features:
Convenient access panels to the compressor
High-efficiency Scroll and Energy-efficient reciprocating compressor.
Copper tube/aluminum fin coil.
Liquid line filter drier.
Fully charged R-22 system.
Louvered Guard Protection

7. 10 & 12 SEER Packaged Gas Electric
Control Features:
Convenient access panels to the Evaporator coil and control section.
Direct spark ignition system, which includes a microprocessor based control for the entire ignition sequence, all blower operation and all safety circuits.
Diagnostic Indicator provided for trouble shooting system faults.

8. Design Objectives 2 – 5 ton Single Phase 3, 4 & 5 ton Three Phase
12 &10 SEER Cooling, 80% AFUE Heating
Capable of expansion to higher SEER ratings
Convertible
Easy Access Service Panels
Architectural Gray

9. 12 & 10 SEER Packaged Gas Electric
Heating Features:
Convenient access panels to the heating section.
Redundant gas valve, natural gas and easy conversion to propane.
Power-assisted combustion.
L.P. Conversion Kit Available
12 & 10 SEER units offer a durable, T-140 Aluminized Steel tubular heat exchanger.
California Low Nox Approved

10. We begin with T-140 Aluminized Steel tubes
Wrinkle-bend Process
We begin with T-140 Aluminized Steel tubes
Manufacturing stress including wall-thinning is minimized
Wrinkles are placed precisely where we want them
Wrinkles promote turbulence to aid heat transfer and efficiency

11. Dual-diameter/Muffler-joint
We apply a patented process to join tubes
1-3/4” diameter fits inside a 1-1/4” diameter
Tubes are joined with a proprietary process
Velocity of combustion products is optimized
Efficiency is maximized

12. Tubular Technology Renders Clamshell Obsolete
800°F
1,000°F
1,000°F
300°F
300°F
300°F
300°F
110°F
Non-uniform thermal growth
Eyelets can pop
Stress-cracks can form
Tube can grow in length and diameter
Growth is uniform at the cross-section
No opportunity for stress-cracks

13. INSTALLATION

14. CLEARENCE FROM COMBUSTIBLE MATERIALS

15. CURB INSTALLATION

16. RIGGING

17. PIPING

18. CONDENSATE DRAIN

19. FLUE HOOD & BUG SCREEN

20. 12 & 10 SEER Packaged Gas Electric
McDaniel Metals
Accessories By

21. 10 & 12 SEER Packaged Gas Electric
Blower Features:
Convenient access panels to the blower section.
Filter rack included on 12 SEER large (4 &5 ton) chassis.
Easy removal of blower with two screws.
Multi-speed evaporator blower.
Fully insulated with blankets of fiberglass.

22. 12 & 10 SEER Packaged Gas Electric
Base Features:
042 Aluminized Steel Bottom/Base Pan
2” High Base Rails
Shipped with four panels

23. DUST COVER INSTALLATION

24. RECOMMENDED FILTER SIZES

25. Electrical
208/230 Volt Power connections and 460 Volt available in 5 Ton Cool only model
Single Phase and Three phase models available
Maximum Over current Protection determined by model

26. Wiring
All wiring should be made in accordance with the National Electrical Code.
Wire sizes and over current protection should be determined from the unit nameplate ampacity.
Wire sizes should not be smaller than recommended by these two sources.
All exterior wiring must be within approved weatherproof conduit.
The unit must be permanently grounded in accordance with local codes.

27. HIGH VOLTAGE WIRING

28. LOW VOLTAGE WIRING

29. CHECKING THE COMPRESSOR

30. CHECKING CONTACTOR

31. CHECKING CAPACITOR

32. COMPRESSOR NORMINCLATURE

33. COMPRESSOR DIAGONSTICS

34. TESTING FOR GROUNDED COMPRESSOR

35. FLOW RATER

36. EVACUATION

37. HEATING SIDE OF GPG

38. CHECKING GAS PRESSURE Manifold Outlet Gas Pressure
Natural…. Min. 3.2” W.C., Max 3.8” W.C.
Propane….Min. 9.7” W.C., Max. 10.3” W.C.

39. CHECKING BURNERS

40. Burner

41. BURNER BOX REMOVAL

42. CHECKING BURNERS

43. CHECKING LIMIT SWITCH

44. Pressure Switch Check
Meter on AC Voltage Setting ; between Quick Connect on Pressure Switch and Ground
Prior to Operation check for open side of Pressure Switch (No Voltage Present)
When Pressure Switch Closes 24 Volts should be present on N/O side
Issue: Watch for switch bounce on windy days
Issue: Watch for P.S. drop-out for low pressure

45. CHECKING PRESSURE SWITCH

46. CHECKING PRESSURE SWITCH

47. PRESSURE SWITCH

48. INDUCED DRAFT BLOWER

49. Understanding ECM Motors

50. Understanding ECM Motors
What does ECM mean?
How does the ECM work?
Variable Speed vs Constant Volume.
What is PWM
How does the ECM sense static pressure?
Troubleshooting ECM motors.
In this discussion we will be covering the following topics;
What does ECM mean? Who came up with that acronym?
How does the ECM work?
Variable Speed vs. Constant Volume.
What is PWM
How does the ECM sense static pressure?
Troubleshooting ECM motors.

51. BLOWER MOTOR & HOUSING

52. Electronic Controls

53. B18099-18 Control B18099-21 Has Green Diagnostic LED
B Cannot be
used alone; must be used
with B Control
B Control is set
up for 50Hz Operation and
for use in Europe (CE Mark)

54. Control Environment +80 to -40 Degrees Celsius (+176 to -40 F)
10% to 95% R.H. Non-Condensing
98 to 132VAC Line Voltage
18 to 30VAC Control Voltage
Frequency - 60Hz
UL & cUL Approved

55. General Functions “W” Input Off (Call for Heat Satisfied)
“W” Input On (Call for Heat)
Checks to see pressure switch open
Turns on Inducer
Pressure Switch Closes; 15 Second Pre-Purge
Starts Sparking & Gas Valve Turns On for 7 Seconds
Flame Sensed Anytime During Spark
Gas Valve Stays On
Blower Comes On after 30 Second Delay
“W” Input Off (Call for Heat Satisfied)
Gas Valve De-Energizes Immediately
Inducer Remains on for 29 Second Post Purge
Indoor Blower De-Energizes after Selected Blower Off Delay

56. General Functions Continued....
Single Compressor Mode (Tab is not Broken)
“Y” Input On (Call for Cooling)
3 Minute Anti-Short Cycle Timer from the time the compressor was last on.
Cooling Speed Blower after a 7 second delay
“Y” Input Off (Call for Cool Satisfied)
Cooling Speed Fan Off after 60 Second Delay
Dual Compressor Mode (Tab is Broken)
1st Stage Compressor is Energized Externally
“Y” Input On for 2nd Stage Cooling after 7 Second Delay
“Y” Input Off ; Cooling Speed Fan off after 60 Second Delay

57. General Functions Continued....
“G” Input On (Call For Fan)
Fan Immediately on Heat Speed
“G” Input Off
Fan Immediately Shuts Off
If “Y” input Occurs During “G”
Blower Switches to Cooling Speed
If “W” Occurs During “G”
Blower off when Heat Blower On Delay Begins
Continuous Fan Operates while control is in Heat Mode Lockout
Test/Speed-Up Bypasses Compressor Short-Cycle Timer
If Shorted for Over 4 Minutes ; Control Ignores = Operates Normal

58. Diagnostic Codes Steady On = Normal Operation in Standby
1 Flash = Lockout for Ignition Failure or Flame Dropouts
3 Trials for Ignition or 5 Flame Losses
2 Flashes = Pressure Switch Open with Inducer On
3 Flashes = Pressure Switch Stuck Closed with Inducer Off
4 Flashes = Limit Switch Open
Heat Speed Blower and Inducer On Until Limit Closes
Blower Runs thru Off Delay; Inducer runs thru 29 Second Post-Purge
5 Flashes = Flame Detected with Gas Valve Off
Blower and Inducer Both On Until No Longer Sensed
Control Locks out But Senses Limit and Flame
Control is Reset By Removing Power or after 1 Hour Automatically
6 Flashes = Compressor Delayed for Short Cycle/Staging Timer
Status Light Off = Board Hardware Fault

59. Flame Sense Checking Digital Meter set for lowest uA Setting
Meter in series with Flame Sense Rod Wire
Control must read a minimum of .5uA during flame sensing period
Average current reading is around 3-5uA.
Control constantly monitors Flame during heating operation
Issue: Flame Sense Rod gets corroded ; Clean w/ steel wool
Issue: Flame Rod not situated in Flame Correctly

60. Ground Check Meter set to Ohms or Resistance Setting
Place Meter from P1-6 or COM quick connect to chassis ground
Reading should be near Zero ohms
Issue: COM Quick Connect Loose ; causes board resetting when blower starts
Issue: Flame Sensing problems if improper grounding in system

61. GPG TROUBLESHOOTING THEORY OF OPERATION
Control of heating, cooling, and fan functions in response to a standard thermostat
Direct spark ignition using a microprocessor to control timing, flame sensing, and ignition retries
Monitoring of system pressure switch and limit switch
Control of gas valve, indoor fan, and induced draft motor based on the thermostat demand and status of safety inputs
Control of compressor contactor
Diagnostic indicator to provide information on power to the control and control status

62. GPG TROUBLESHOOTING Summary of Timing Functions (in seconds) Function
Signal Name
Delay-On
Delay-Off
Heat Speed
MV (1) 30
120, 135,150 (2)
Cool Speed Y 7 60
Compressor
60 (3)
180 (4)
Induced Draft
15 (5) 29
1. Heat speed delay on and off occur only after flame has been sensed and main valve (MV) is energized
Selectable with jumpers
3. Indicates timing when “Two Stage Comp” tab is broken off, timer becomes delay on make
4. Indicates timing when “Two Stage comp”tab is not broken off, timer becomes compressor lock out between cycles(I.e. Minimum timing between compressor cycles)
5. Prepurge timing (not delay on )

63. GPG TROUBLESHOOTING Inputs
Limit Switch –The limit switch is connected to control pins 4 and 5. The limit switch is connected is electrically between fused 24 VAC and the thermostat R
Pressure Switch-The pressure switch is connected on pins 6 and 8. The pressure switch “W and the gas valve relay contacts
Thermostat call for Heat “W”-24 VAC thermostat input. Connection via pin 10
Thermostat call for cool “Y”- 24 VAC thermostat input connections via pin 11
Thermostat call for fan “G”- 24 VAC thermostat inputs. Connection via pin 7
Flame Sense- Open circuit flame sense voltage shall be approximately 100 VAC . The control requires at least .5 microamperes DC flame current to guarantee flame is sensed

66. 12 & 10 SEER Packaged Gas Electric
Leading Warranties:
12 SEER offers an Aluminized Steel Heat Exchanger with a 20Year limited Warranty and10 Year Limited Warranty on the Compressor and Parts.
10 SEER offers an Aluminized Steel Heat Exchanger with a 20Year limited Warranty and 5 Year Limited Warranty on the Compressor and Parts.