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Summary of Contents for TemperZone UC8
- Page 1 Temperzone UC8 Troubleshooting Guide UNIT CONTROLLER 8 (UC8) Troubleshooting guide Date: 21 April 2017 Issue: 3 Page 1 of 24...
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Page 2: Table Of Contents
SAT-3 room thermostat fault codes ..................17 SAT-3 internal fault codes ....................17 SAT-3 + Zone controller fault codes ................... 17 SAT-3 + UC8 fault codes ..................... 18 Protection function details ......................19 High pressure protection (HP)....................19 Low pressure protection (LP) ....................19 Indoor coil frost protection .................... -
Page 3: Cautions
Laptop computer with USB to RS485 converter (Hyperterm or TeraTerm program installed) 3. Recommended set of spare parts Known good UC8 controller circuit board, programmed with software version 2.1.9 or later Set of Temperzone standard temperature sensors (yellow, blue, red and white leads) ... -
Page 4: Controller Start-Up Procedure
Temperzone UC8 Troubleshooting Guide 5. Controller start-up procedure When mains power to the UC8 controller is switched on it follows a defined start-up procedure. The controller start-up procedure is, in this order: 1. The yellow light marked Power must illuminate. -
Page 5: Viewing System Information
Under those conditions it is possible to use the display on the UC8 controller to view information on pressures, temperatures, superheat, expansion valve opening, capacity and the controller Modbus address. This is available regardless whether the compressor is on or off. -
Page 6: Controller Test Mode
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. -
Page 7: Commissioning Mode
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. -
Page 8: Troubleshooting Procedure
Power light is 3. All mains wiring and connectors are OK. 4. Mains phases connect in the right sequence. 5. 230V AC voltage is present across the UC8 L and N terminals. 6. No short circuit exists between UC8 terminals 12 and Check: 1. - Page 9 ●? TZT-100 or SAT-3 wall thermostat? Satellite dish shown on t-stat display? Check wiring between UC8 and the thermostat. Pressure differential is too high to allow the inverter compressor to start: Display shows Wait until the pressures have equalised.
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Page 10: Fault Messages
Fix leak, evacuate unit, then recharge. protection Expansion valve (EEV) is Check valve coil is properly fitted onto the valve closed. body. Check UC8 DIP switch settings. Repair wiring to the valve. Replace expansion valve. Faulty transducer cable. Repair transducer cable. Faulty transducer. - Page 11 Temperzone UC8 Troubleshooting Guide Display Meaning Possible causes Possible remedy HI-SL High suction Insufficient refrigerant. Add refrigerant. line Very high room temperature Reduce indoor fan speed (temporarily). temperature (cooling mode). protection Very high outdoor ambient Do not operate the unit in heating mode with temperature (heating mode).
- Page 12 To unlock the following steps MUST be followed times in a row without making in order: any successful (complete) 1. Press the UC8 pushbutton to unlock. cooling or heating cycle. 2. Fix the cause of the repeating problem. 3. Allow the unit to make at least one successful (complete) cooling or heating cycle.
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Page 13: Fault Codes
Thermostat serial Loose wiring. Repair connections. comms lost Electrical interference. Use twisted pair screened cable. Signals A and B must form a pair. Connect screen to 0V at the UC8. Re-route cable away from other cables. Page 13 of 24... - Page 14 Electrical interference. Use twisted pair screened cables. Signals A and B must form a pair. System 3 serial Connect screen to 0V at the UC8. comms lost Re-route cables away from other cabling where possible. System 4 serial Incorrect DIP switch settings.
- Page 15 Restore power to the indoor unit. Electrical interference. Use a twisted pair screened cable. Signals A and B must form a pair. Connect screen to 0V at the UC8. Re-route cables away from other cabling where possible. The indoor unit should use the same earth point as the outdoor unit.
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Page 16: Inverter Fault Codes
(inverter). Notes: The fault code shown on the UC8 display is F100 + the error code reported by the Power+ driver. For detailed information about the Power+ fault codes refer to the Carel Power+ speed drive user manual, chapter 8.3: Alarms table. -
Page 17: Fault Codes Shown On A Room Thermostat
14. Fault codes shown on a room thermostat TZT-100 room thermostat fault codes When the UC8 is connected to a TZT-100 room thermostat and a fault is detected then the thermostat will show the word FAULT on the display (flashing slowly). The TZT-100 room thermostat cannot show individual fault codes. -
Page 18: Sat-3 + Uc8 Fault Codes
Temperzone UC8 Troubleshooting Guide SAT-3 + UC8 fault codes SAT-3 UC8 display Fault Notes display code code ● Blank No faults Lock out UC8 display shows the cause. A1 A4 HP trip A1 A5 LP trip A3 A6 Overload A1 A6... -
Page 19: Protection Function Details
Temperzone UC8 Troubleshooting Guide 15. Protection function details High pressure protection (HP) Protects a unit from excessively high refrigerant pressure. Conditions: Unit with HP switch: When the switch activates (open circuit). Unit with high pressure transducer: When compressor discharge pressure exceeds 4151 kPa (602 PSI, equivalent to +65°C condensing temperature). -
Page 20: High Suction Line / Evaporating Temperature Protection
Temperzone UC8 Troubleshooting Guide High suction line / evaporating temperature protection Protects the compressor motor from overheating. If the unit has a variable duty compressor (digital scroll or variable speed) then high suction pipe / evaporating temperature protection is applied only when capacity is at 50% of nominal duty or higher. -
Page 21: Reverse Cycle Valve Fault Protection
Applies only to air-to-air units with two pressure transducers (connected to UC8 inputs HPT and LPT) and with a temperature sensor fitted to the indoor coil (connected to UC8 input IC for packaged units or connected to IUC input T1 for split units). -
Page 22: Low Compression Ratio Protection
By BACnet command sequence. Refer to document UC8 BACnet communications for details. When a unit was locked out and the UC8 controller is reset, e.g. by removing and then restoring mains power, the display will show the previous fault message for 20 seconds (after the normal start-up sequence). -
Page 23: Unit Log
The controller keeps an internal log of certain information. The log can be viewed as follows: Connect a USB to RS485 converter to a computer and to UC8 terminals A1 and B1 respectively. On the computer start a communications program such as HyperTerm or TeraTerm. - Page 24 Disclaimer: Information given in this document is believed to be correct at the time of writing. Temperzone assumes no responsibility for any errors that may appear in this document. Information in this document is subject to change without notice and should not be construed as a commitment by Temperzone.
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