Temperzone UC8 Operation, OSA models with inverter, issue 1
12. UC8 controller circuit board specifications
Notes:
• Relay outputs HIGH, MED, LOW, C3, C4, CMC, R/V, SSR#1 and SSR#2 are isolated from all other
circuits. It is permitted to connect these relay outputs to mains live circuits.
• Inputs HI, ME, LO, C1, CP, HT and C2 are isolated from all other circuits. These inputs accept
24V AC or 12V DC control signals.
• All other input and output signals from/to the UC8 are referenced to unit EARTH.
• It is recommended that any input signal that is referenced to EARTH and that needs to connect
to a circuit external to the temperzone unit to be isolated by a suitable means, for example a
relay. Typical examples of this are the remote On/Off input and the DRED inputs.
• For safety and to ensure correct operation of the unit the EARTH terminal must directly
connect to a unit earth stud located close to the controller board.
Controller environmental conditions
Storage temperature range
Operating temperature range
Relative humidity
-20 to +75°C
-10 to +65°C
20 to 95% non-condensing
Output relays
Applies to:
HIGH, MED, LOW, CMC and R/V outputs
250V AC, 5A maximum, resistive load
250V AC, 2.5A maximum, inductive load
Solid state output relays
Applies to:
SSR1 and SSR2 outputs
12V AC minimum, 250V AC maximum (AC only!)
0.25A maximum (continuous)
2.5A maximum (peak, 0.5s)
AUX and FLT outputs
Designed to operate a relay with 12V DC
coil.
Open collector and +12VDC output
OFF state: leakage current 0.5mA maximum
ON state: 12V DC, 100mA maximum
EXV1 output
For control of auni-polar electronic
expansion valve (5-wire or 6-wire type)
Open collector and +12VDC output
OFF state: leakage current 0.5mA maximum
ON state: 12V DC, 275mA maximum per winding/coil
EXV2 output
For control of 12V DC relay coils.
Open collector and +12VDC output
OFF state: leakage current 0.5mA maximum
ON state: 12V DC, 275mA maximum per winding/coil
Continued on the next page.
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