Temperzone UC8 Operation, OSA models with inverter, issue 1
Isolated inputs
Applies to:
HI, ME, LO, CP and HT inputs
Common terminals are:
C1 for HI, ME and LO
C2 for CP and HT
When used with 24V AC input signals:
Maximum input voltage OFF state: 2V RMS AC
Minimum input voltage ON state: 18V RMS AC
Absolute maximum input voltage: 35V RMS AC
Input impedance: 2.5kΩ
When used with 12V DC input signals:
Maximum input voltage OFF state: 2V DC
Minimum input voltage ON state: 11V DC
Absolute maximum input voltage: 35V DC
Input impedance: 2.5kΩ
VC and VF 0-10V analogue inputs
Referenced to terminal 0V
Absolute maximum input voltage: -2 to +15V DC
Nominal input voltage: 0 to +10V DC
Input impedance: 13.9kΩ
IN#1 and IN#2
DRED inputs D1, D2, D3
Remote On/Off input
Referenced to terminals 0V and SC
Designed to be operated by isolated voltage free
contacts.
Open circuit voltage: 3.3V DC typical
Closed circuit current: 3.3mA DC typical
V1 and V2 0-10V analogue outputs
Referenced to terminal 0V
Maximum load: 6.5kΩ
Maximum short circuit output current: 30mA
Temperature sensor inputs
DL: red
SL: white
AMB: black (electric heating
models only)
IC: yellow
OC, DEI: not used on hydronic units
Designed to connect to standard Temperzone
thermistor temperature sensors.
Pressure transducer inputs
Power: 5.0±0.2V DC, maximum current draw 50mA
Signal: 0.5V at the lowest pressure
4.5V at the highest pressure
Pressure ranges:
LPT, all units: 0 to 3450 kPa (0-34.5 bar, 0-500 PSI)
HPT, all units: 0 to 4500 kPa (0-45.0 bar, 0-653 PSI)
Modbus RS485 serial communications
format
Baud rate 19200
Data bits 8
Parity even
Stop bits 1
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