Foster Solo Plus - Inputs; Outputs; Controller Board Electrical Connections; Resistance Values

40
INPUTS
Air Temperature Probe - Senses coldroom internal temperature. Negative temperature/resistance coefficient thermistor
probe.
Evaporator Temperature Probe - Senses temperature at the suction line outlet from the evaporator, required to terminate
defrosting. Negative temperature/resistance coefficient thermistor probe.
OUTPUTS
Compressor - Relay output switching single phase mains supply to the compressor direct or via a contactor for three
phase models.
Evaporator Fans - Relay output switching single phase mains supply to the evaporator fans.
Condenser Fans - Relay output switching single phase mains supply to the condenser fans.
Defrost - Relay output switching single phase mains supply to the hot gas solenoid valve.
Internal Light - Relay output switching single phase mains supply to the internal light (if fitted).
Door Frame Heater - Direct single phase mains supply to the door frame heater (if fitted).
External Alarm - Relay output switching single phase mains supply to an external alarm (if fitted).
CONTROLLER BOARD ELECTRICAL CONNECTIONS
Terminal Numbers Output
+/- Connection to keypad
2 External alarm (if fitted)
3 Mains in (3 phase models only)
19 / 20 Door switch (if fitted)
17 / 18 High pressure switch (SP 4H, 5H, 3L, 4L, 5L only)
13 / 14 Air probe
11 / 12 Defrost probe
45 Hot gas defrost valve
55 Condenser fan
21 Compressor or contractor coil (3 phase only)
22 Mains in (single phase)
44 Internal light (if fitted)
40 Door frame heater (if fitted)
50 Evaporator fan motor
70 Neutrals
60 Earth
RESISTANCE VALUES
The air and defrost probes have the following temperature resistance values (K ohms).
+50°C 4161 +10°C 17,960 –20°C 67,740
+30°C 8015 0°C 27,280 –30°C 111,300
+20°C 12,090 –10°C 42,450 –50°C 329,200