1. Fan Coils Units Control
25-Apr-17
Fan Coils Units Control
Wall mounted, 2x2 and 3x3 cassette fancoil units
MERCA, SRC and WRC

2. Wiring connection SRC SLM 3 or MERCA
CN_DSP
CN_WIR or
MERCA
Note: Only one application is function at one time, either wireless or wired

3. Wireless controller WRC-xxA Transmission LCD Display ON/OFF Switch
25-Apr-17
Wireless controller
WRC-xxA
Transmission
LCD Display
ON/OFF Switch
Temperature
Setting
Operating Mode
Fan Speed
Timer Switch Setting
SRC-HPA
Turbo Mode
“Sleep” Function
Swing
Real Time Clock

4. Simplified wired controller
25-Apr-17
Simplified wired controller
SRC-xxA
FWT / FWF / FWC
Temperature Display
Operating Mode
Fan Speed
ON/OFF Switch
IR Receiver
“Sleep” Function
Timer Switch Setting
Swing
Temperature
Setting
SRC-HPA
SRC-HPA

5. Standard wired controller
25-Apr-17
Standard wired controller
MERCA
FWT / FWF / FWC
LCD Display
Fan
ON/OFF Switch
Operating Mode
Sleep
Temperature Setting
Swing
SRC-HPA
Real Time Clock
Timer Active
ON/OFF Timer

6. Mode Selection The PCB has 4 modes selection via jumper: Model
25-Apr-17
Mode Selection
The PCB has 4 modes selection via jumper:
Model
Configuration
Operating Modes M1
2 pipes
Cooling or Heating (no Auto mode) M2
2 pipes + Aux. Htr
Cooling or Heating with Aux. Htr (no Auto mode) M3
4 pipes with Boiler
Cooling only or Boiler (with Auto mode) M4
4 pipe + Boiler
Cooling or Heating with Boiler water (no Auto mode)

7. 25-Apr-17
Last Memory
Options for last memory setting is available by setting of J_LST.
Last setting that memorized:
1. Mode and on/off status
2. Set Temperature
3. Fan Speed
4. DC & AC Swing
5. Flap stop coordinate (for DC swing off mode)
For Default setting, power up is “OFF” mode, temperature
setting is 24 o C, indoor fan speed is High and swing mode
is off.
Setting
J_LST
With Last Memory Setting
Short
Default Setting
Open

8. Valve/Valveless Control Selection
Setting
Jumper Valve
Valve control
Short
Valveless control
Open
Valve Jumper

9. Temperature range and setting
25-Apr-17
Turn ON/OFF
3 ways to turn on / off the system:
1. Via ON/Off triggering - pressing emergency ON/Off button
or LCD controller ON/OFF button. Override timer setting
2. Via delay timer - Delay timer is to simulate the ON/OFF
pressing after the set numbers of hours
3. Via real time ON/OFF timer - When the real time ON timer
set time matches the internal real time clock, unit will switch
on, similar for OFF time. The timer setting are retained so
that similar switching can occur 24 hours later
Temperature range and setting
Temperature setting allowed in COOL, DRY, and HEAT mode Temperature range is 16 o C to 30 o C

10. Fan Priority Setting
This option applied to Cool, Heat and Auto mode (apply only during thermostat off cycle)
FAN_P Jumper
Setting
Jumper FAN_P
User set speed or low fan if auto mode is selected
Short
Fan stop when thermostat cuts off
Open

11. Bar Heat Mode Setting This setting is to bar user from using Heat mode
Jumper Heat
Heat mode allow to use
Short
Bar Heat mode
Open
Heat Jumper

12. Sleep Mode Only available for COOL & HEAT modes -
25-Apr-17
Sleep Mode
Only available for COOL & HEAT modes -
This function will increase (cooling mode) or decrease (heating mode) the set temperature with time
The option can be set or reset by the LCD or LED controller. Activation of Emergency switch will reset this option .

13. 25-Apr-17
Sleep Mode
Sleep Mode: energy saving option while optimising comfort conditions by temperature adjustment
In cooling mode, this function will prevent
excessive cooling during summer season
After the first 1/2h, T0°→ T0° + 0,5°C
After 1h, T0°→ T0° + 1°C
After 2h, T0°→ T0° + 2°C
In heating mode, this function will prevent
night sweat
After the first 1/2h, T0°→ T0°-1°C
After 1h, T0°→ T0°-2°C
After 2h, T0°→ T0°-3°C
Energy Saving
Comfort
Temperature profile – Sleep Mode
Sleep Mode activated
SRC-HPA
Sleep Mode activated

14. Cool Mode - With Water Valve
25-Apr-17
Cool Mode - With Water Valve
Water valve will cut in if the Tr >= Ts + 1 C. Water valve cut out if Tr=<Ts. Thermostat cut in or out is decided every 30 seconds. In this mode, indoor fan will follow jumper FAN_PRIO setting.
If jumper FAN_PRIO is ON:-
- For manual fan speed setting, indoor fan will run as per user set speed.
- In AUTO FAN, the indoor fan speed will run as follows:
Tr: room T°
Ts: T°set

15. Cool Mode - Without Water Valve
Fan speed decision is made every 30 seconds.
Fan speed will run as the following diagram
Manual fan speed
Auto fan speed

16. Heat Mode - With Water Valve
25-Apr-17
Heat Mode - With Water Valve
Water valve will cut in if the Tr =< Ts - 1 C. Water valve cut out if Tr<=Ts. Thermostat cut in or out is decided every 30 seconds.
If jumper FAN_PRIO is ON:-
- For manual fan speed setting, indoor fan will run as per user set speed.
- In AUTO FAN, the indoor fan speed will run as follows:
Tr: room T°
Ts: T°set

17. Heat Mode - Without Water Valve
Fan speed decision is made every 30 seconds.
Fan speed will run as the following diagram
Manual fan speed
Auto fan speed

18. 25-Apr-17
Pipe Water Temperature Sensor (Indoor Coil Sensor) Cool Mode - With Water valve
Water valve and indoor fan at set fan speed will be forced to cut in
minimum 2 minutes irrespective of thermostat cycle during power on
reset / change mode/unit recover from fault

19. Pipe Water Temperature Sensor (Indoor Coil Sensor) Cool Mode - Without Water valve
Indoor fan is forced to run at low speed for at least 2 minutes
irrespective of thermostat cycle during power on reset /
change mode / unit recover from fault

20. Pipe Water Temperature Sensor(Indoor Coil Sensor) Heat Mode - With Water valve
Water valve will be forced to cut in minimum 2 minutes
irrespective of thermostat cycle during power on reset /
change mode / unit recover from fault

21. Pipe Water Temperature Sensor(Indoor Coil Sensor) Heat Mode - Without Water valve
Indoor fan is forced to run at low speed for at least 2 minutes
irrespective of thermostat cycle during power on reset /
change mode / unit recover from fault

22. Fault Diagnostics Errors Cool LED 7 Segment Indicator
25-Apr-17
Fault Diagnostics
Errors
Cool LED
7 Segment Indicator
Rooms sensor error (short/open)
1 blinks E1
Pipe water sensor error (short/open)
2 blinks E2
Water pump error
6 blinks E6
Pipe water temperature fault
5 blinks E5