TemperZone UC8 Troubleshooting Guide

Temperzone UC8 Troubleshooting Guide
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7. Controller test mode
A controller test mode is available that can provide a quick check of the operation of relays, contactors
and fans. Test mode can only be activated when the unit is not already in commissioning mode, the
compressor must be off and the thermostat or BMS must not request to start.
To activate test mode hold down pushbutton SW3 until the display shows the letter ‘t’, then release the
button.
During test mode following outputs are activated one by one, in the order indicated in the table below,
with a brief pause between each step. When the test sequence is complete the UC8 returns to normal
mode and the display will show the suction line pressure (letters SLP followed by the pressure in kPa)
or it may return to show a flashing decimal point.
Step
Test
Duration (seconds)
Notes
1
Output R/V (reverse-cycle valve)
2
2
Outdoor fan low speed
7
1, 3, 4, 5
3
Outdoor fan medium speed
7
4
Outdoor fan high speed
15
5
Indoor fan low speed
7
2, 3, 6, 7, 8
6
Indoor fan medium speed
7
7
Indoor fan high speed
15
8
Output SSR1
2
9
Output SSR2
2
10
Output AUX
2
11
Pressure transducer test
1
9
12
Output CMC (compressor contactor)
2
Notes:
1 Steps 2, 3 and 4 are skipped on hydronic units (no outdoor fan).
2 Steps 5, 6 and 7 are skipped on chillers and water-heating units (no indoor fan).
3 If the fan is a three speed type then relays Low, Medium and High activate in turn.
4 If the outdoor fan is a variable speed type (0-10V control) then relay Medium will activate, but
only if this relay is not required for a three-speed indoor fan.
5 If the outdoor fan is a single-speed type then relay Medium activates for 29 seconds in total.
6 If the indoor fan is a variable speed type (0-10V control) then relay High will activate, but only
if this relay is not required for a three-speed outdoor fan.
7 If the indoor fan is a single-speed type then relay High activates for 29 seconds in total.
8 If the unit is a split type and the indoor unit has an indoor unit controller (IUC) then the indoor
fan is tested via the IUC and steps 5, 6 and 7 will not activate any output on the UC8 controller.
9 Step 11 is skipped if the unit does not have both the low- and the high-pressure transducers. If
the test is performed then pressure readings are expected to be approximately equal. If they are
found to be very different then fault F34 is reported. The fault is cleared automatically when
pressures are sufficiently equalised.

TemperZone UC8 Specifications

General

Brand	TemperZone
Model	UC8
Category	Controller
Language	English