Temperzone UC8 Troubleshooting Guide
8. Commissioning mode
A controller commissioning mode is available that allows doing a quick check of the operation of the
entire unit. Commissioning mode can only be activated when the compressor is off and the thermostat
or BMS must not request to start.
To activate commissioning mode hold down pushbutton SW3 until the display shows the letter ‘c’, then
release the button.
Commissioning mode starts immediately and ends automatically after 30 minutes. It is also possible to
manually end commissioning mode either by cycling mains power off and on again, or by pressing the
pushbutton again until the display again shows the letter ‘c’ and then release. When commissioning
mode ends the controller returns to normal operating mode.
During commissioning mode some delay times are reduced:
Minimum On-Off time (‘Run’-time) 20 seconds (note)
Minimum Off-On time (‘Off’-time) 20 seconds
Minimum On-On time (‘Cycle’-time) 1 minute
Cool to heat change-over time 1 minute
Heat to cool change-over time 1 minute
De-ice mode hold-off time 3 minutes
Note:
If the unit has a variable speed compressor then the Minimum On-Off time (‘Run’-time) remains set to
90 seconds regardless whether the controller is placed in commissioning mode or not.
9. Timer durations
Unit start-up delay (after mains power-on)
Minimum compressor run-time
(On-to-Off duration)
Minimum compressor off-time
(Off-to-On duration)
Minimum compressor cycle-time
(On-to-On duration)
6 minutes
(a maximum of ten compressor starts per hour)
Hydronic unit compressor start delay
(allows time for a water valve to open)
Compressor high discharge pipe temperature
protection
Indoor coil frost protection
Hydronic unit water freeze protection
High suction line temperature/pressure
protection
Low / high discharge superheat protection
High / low compression ratio protection
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