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Temperzone Unit Controller 6 - Operation and installation- Hydronic
The UC6 will automatically reduce capacity of a variable compressor before the
maximum value of 42bar / 66°C is reached.
When a compressor is stopped due to high pressure it is held off for a period of 3
minutes, after which it is allowed to restart (provided pressure has fallen well
below the maximum).
If three consecutive trips occur then the unit will be "locked out". The trip counter
is reset to 0 when there has been no compressor run request for longer than 60
minutes.
Display indication when protection is active
6.5.
Loss of refrigerant protection (LOR)
When a compressor is running the UC6 continuously monitors the various
temperatures and pressures. The controller software applies logic that enables it
to determine whether the system has an adequate amount of refrigerant. Signals
used for this check are suction temperatures ST1 and suction line pressures SP1.
The check is not made during the first 5 minutes after a compressor is started to
allow pressures and temperatures to settle.
If the compressor is a variable speed type or a digital scroll type then the check is
made only when the capacity is at 100%.
When a compressor is stopped due to loss of refrigerant it is held off for a period
of 3 minutes, after which it is allowed to restart.
If three consecutive trips occur then the unit will be "locked out". The trip counter
is reset to 0 when there has been no compressor run request for longer than 60
minutes.
Display indication when protection is active
6.6.
High suction line temperature (HiST)
When the suction line temperature is above 30°C and continuously for 15
minutes, stop the compressor.
If the compressor is a digital scroll type then the check is made only when the
capacity is at 100%.
When a compressor is stopped due to high suction temperature, it is held off for a
period of 3 minutes, after which it is allowed to restart.
If three consecutive trips occur then the unit will be "locked out"
Display indication when protection is active
6.7.
Indoor coil frost protection (FROST)
When the unit is cooling the evaporating temperature in the indoor coil must
remain above -4°C (adjustable from -10°C to -2°C by using a UC6 service tool).
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