NOTE! The EARTH terminal on the UC8 controller board MUST always be
directly connected to the unit earth stud.
1.2. Low voltage signals
HI, ME, LO, CP and HT: Control signal inputs, 24V AC or 12V to 24V DC
DL, SL, AMB, DEI, OC, IC: Inputs for Temperzone standard temperature sensors
HPT, LPT: Inputs for Temperzone standard pressure transducers
IN#1, IN#2, D1, D2, D3, On: Control signal inputs for voltage free relay contacts
VC, VF: Control signal inputs, 0-10V analogue
A1, B1, A2, B2: Communication ports, RS485 Modbus RTU
HIGH, MED, LOW, C3, C4: Relay contact outputs
CMC, R/V: Relay contact outputs
SSR#1, SSR#2: Solid state relay contact outputs
V1 and V2: Control signal outputs, 0-10V analogue
EXV1, EXV2: Outputs for 12V DC uni-polar electronic expansion valves
AUX, FLT, EXV2: Outputs for 12V DC relay coils
Notes: The UC8 controller cannot accept 230V AC signals on any of the low voltage inputs!
Terminals marked “0V” and “SC” are electrically directly connected to the EARTH terminal.
1.3. Temperature sensor inputs
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