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Temperzone Unit Controller 6 - Operation and installation- Hydronic
6.11.
Low output water temperature protection
If the output water temperature is blow 2°C for a contain time, stop the
compressor. Minimum output water temperature and the delay time are
configurable variables on UC6 service tools Service Configuration page.
6.12.
Compressor lock-out
Certain faults (as outlined in the preceding paragraphs) can cause the unit to be
"locked out" if they occur three consecutive times while the compressor-run
request has remained active. When a unit is locked out the compressor is not
allowed to start until the lock-out is manually reset. Lock-out protects the unit
from repeatedly starting the compressor when a serious fault exists that requires
the attention of a service technician.
When a unit is locked out the alarm relay output (NO7, NC7) will be active.
A unit that is locked out can be reset by either of the following two methods:
1. Remove mains power from the unit for at least 3 seconds, and then restore
power.
2. Use a UC6 service tool to manually reset the lock-out condition.
Display indication when protection is active
6.13.
Sensor alarm
If the signal of a temperature sensor or pressure transducer is out of normal
operating range the UC6 will generate an alarm. The sensor may be faulty,
disconnected or short circuit.
Display indication temperature sensor alarm
Display indication pressure transducer alarm
6.14.
Loss of RS485 communications alarm
If the UC6 does not receive correct responses from a device that connects via the
RS485 Modbus serial communications port then an alarm is generated. Examples
of such devices are: a TZT-100 thermostat, a Carel Power+ inverter.
Display indication for communications fault
7. Test mode
Test mode can only be activated when both compressors are OFF.
To start test mode press and hold down the push button on the lower board
between 1 and 5 seconds.
In test mode each output is activated for 5 to 10 seconds, one output at a time.
When test mode completes the unit automatically returns to normal operation.
Display indication when Water Float
Display indication during test mode
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