Incident table (green LED)
Green Led flashes
Description
1st Ser‐
ies
2nd Ser‐
ies
3rd Ser‐
ies
Type
Incident
1, 2 or 3
1
1
Probes
Discharge probe open or short circuited
2
Liquid probe open or short circuited
3
Suction probe open or short circuited
2
1
Temperature
Repeated defrosting
2
The discharge temperature is not recovered
4
1
1
Probes
Supply probe open or short circuited
2
Return probe open or short circuited
3
Outdoor probe open or short circuited
4
Water probe open or short circuited
5
Fault in the enthalpy probes
2
1
Thermostat
Signal Y1 without signal G
3
1
Auxiliary heat
Heating element thermal switch 1
2
Heating element thermal switch 2
3
Heating element thermal switch 3
4
Heating element thermal switch 4
4
1
Temperature
The water coil temperature is not recovered
2
Outdoor temperature too low
3
Water coil performing antifreeze operation
4
Supply temperature above 55 °C
5
Supply temperature < 25 °C with gas
5
1
Others
Defrost cycle
2
There is at least one accessory not found
3
Air quality demand
4
Dirty filters
5
Presence sensor is unoccupied
6
Suction temperature < 0 °C, economiser
6
1
Recovery system
Energy recovery wheel motor trip switch
2
Energy recovery fan motor trip switch
2.3.1 Test button
• If the test button is pressed until the green led is activated, certain times are shortened.
• If the test button is pressed until the orange led is activated, any fault that has been detected is reset.
• If the test button is pressed until the red led is activated, the optional accessories and probes
connected to the board are identified.
2.4 DPC-1 thermostat
When a fault occurs and there is communication between the unit and the thermostat, the thermostat
alternately displays the time and the fault produced according to the unit fault table.
It also displays other faults related to the thermostat.
2
Wiring diagrams
2.4
DPC-1 thermostat
50
Summary of Contents for VCH-25A
Page 4: ...1 Installation manual...
Page 50: ...2 Wiring diagrams...
