TemperZone UC8 Operation Manual
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TemperZone UC8 Operation Manual

TemperZone UC8 Operation Manual

Unit controller 8
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Temperzone UC8 Operation, OSA models with inverter, issue 1
UNIT CONTROLLER 8 (UC8)
Split System models: OSA–RLF
Date:
24 November 2020
Issue: 1
Note:
Information in this document applies to UC8 controllers with
software version 6.1.2-55 and installed in models OSA-RLF
To find the UC8 software version:
Turn on mains power to the UC8 controller and observe the seven-segment display.
The display will show the characters "UC8", followed by the software version, build
number and software identification code (SHA).
Operation Manual
Page 1 of 27

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Questions and answers

Sylverius Didibu
February 20, 2025

Temperzone unit cutout on L.p

User image 67b6798259ea7
0
1 comments:
Mr. Anderson
February 20, 2025

The TemperZone UC8 unit can cut out on low pressure due to the following reasons:
- Incorrect compressor model selected.
- Compressor does not start.
- Issues with the compressor contactor.
- Faulty compressor or contactor wiring.

To resolve this, check and select the correct compressor model, inspect the compressor contactor, and verify wiring connections.

This answer is automatically generated

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Summary of Contents for TemperZone UC8

  • Page 1 6.1.2-55 and installed in models OSA-RLF To find the UC8 software version: Turn on mains power to the UC8 controller and observe the seven-segment display. The display will show the characters “UC8”, followed by the software version, build number and software identification code (SHA).

  • Page 2: Table Of Contents

    Temperzone UC8 Operation, OSA models with inverter, issue 1 Contents 1. UC8 circuit board input and output signals ............4 1.1. Mains power ........................4 1.2. Low voltage signals ......................4 1.3. Temperature sensor inputs ....................4 1.4. Pressure transducer inputs ....................4 1.5.
  • Page 3 Temperzone UC8 Operation, OSA models with inverter, issue 1 7. Dry mode (de-humidification) ................13 7.1. Dry mode and the SAT-3 thermostat ................13 7.2. Dry mode and the TZT-100 thermostat ................14 8. Indoor fan control ....................14 8.1.

  • Page 4: Uc8 Circuit Board Input And Output Signals

    AUX, FLT, EXV2: Outputs for 12V DC relay coils Notes: The UC8 controller cannot accept 230V AC signals on any of the low voltage inputs! Terminals marked “0V” and “SC” are electrically directly connected to the EARTH terminal. 1.3. Temperature sensor inputs...

  • Page 5: Inputs Hi, Me, Lo, Cap And Ht

    Temperzone UC8 Operation, OSA models with inverter, issue 1 1.5. Inputs HI, ME, LO, CAP and HT These inputs are electrically isolated from all other circuits. The inputs can accept 24V AC or 12V DC signals. A thermostat or other controller can be connected as follows:...

  • Page 6: Relay Outputs Cmc, Low, Med And High, Ssr#2

    The communications protocol is Modbus RTU and the signals follow the RS485 standard. On this port the UC8 always acts as a Modbus slave device. The RS485 signal reference is terminal 0V, which is directly connected to unit earth.

  • Page 7: Dip Switch Settings

    Temperzone UC8 Operation, OSA models with inverter, issue 1 2. DIP switch settings Switch Function Indoor fan behaviour Indoor fan speed may vary from the thermostat request. Indoor fan speed follows the thermostat request. Note: Thermostat fan settings and protection functions can override the selections above.

  • Page 8: Digitally Communicating Thermostats: Sat-3 And Tzt-100

    The unit can connect to one SAT-3 or to one TZT-100 room thermostat. It is strongly recommended to use a shielded cable with twisted pair wires. Signals from UC8 terminals A2 and B2 must form one twisted wire pair. The cable shield should connect to terminal “0V” at the UC8.

  • Page 9: Thermostat Communication Settings

    4. Connecting to external devices using Modbus RTU over RS485 The UC8 provides a serial communications port (terminals A1 & B1) for RS485 type signals and wiring. Full monitoring and control are available through this port. The communications protocol used is Modbus RTU.

  • Page 10: Connecting The Indoor Unit

    5. Connecting the indoor unit During the first 30 seconds after mains power to the outdoor unit is switched on the UC8 controller searches for a connection to an indoor unit. The indoor unit must send a reply to the outdoor unit withing that first half minute.

  • Page 11: Connecting 1 Outdoor Unit To 2 Indoor Units

    Temperzone UC8 Operation, OSA models with inverter, issue 1 5.3. Connecting 1 outdoor unit to 2 indoor units The diagram below shows how to connect one outdoor unit to two indoor units. Refer to the IUC manual for the required IUC DIP switch settings.

  • Page 12: Automatic Control With Sat-3 Or Tzt-100 Thermostat

    Temperzone UC8 Operation, OSA models with inverter, issue 1 6.3. Automatic control with SAT-3 or TZT-100 thermostat An OSA unit connected to a SAT-3 or TZT-100 room thermostat automatically varies capacity in order to make the room temperature equal to the selected setpoint temperature and then keep the room temperature constant.

  • Page 13: Oil Recovery (Oil Flush) Cycles

    • High efficiency cooling mode: The UC8 controller must be allowed to vary the indoor fan speed to obtain an indoor coil temperature for optimum unit duty and efficiency. Note that in this mode the indoor fan speed can differ from the speed requested by the thermostat.

  • Page 14: Dry Mode And The Tzt-100 Thermostat

    If the UC8 is not used to control the indoor fan then it is the responsibility of the system- designer and -installer to ensure proper and safe operation of the indoor fan, and the system as a whole, under all operating conditions.

  • Page 15: Indoor Fan Speed Adjustment

    In installations where access to the indoor unit is restricted it could be more convenient to adjust the indoor fan speed settings from the UC8 in the outdoor unit. If this is the case then turn on UC8 DIP switch 5, remove power and then re-apply power to the unit. After that the fan speed settings can be...

  • Page 16: Translation From 0-10V Fan Control Input Signal Vf To A Fan Output Signal

    8.2. Translation from 0-10V fan control input signal VF to a fan output signal Input VF on the UC8 can be used for a 0-10V control signal for the indoor fan. If the indoor fan speed is controlled using a control voltage applied to input VF then that input voltage is translated to a corresponding output voltage.

  • Page 17: Display Messages

    Temperzone UC8 Operation, OSA models with inverter, issue 1 9. Display messages The following messages can be seen on the LED display. Display Meaning Notes / factory setting Controller name 6.1.2-55 Software version and build number Shown only after power-on...
  • Page 18 Temperzone UC8 Operation, OSA models with inverter, issue 1 Pressures and temperatures and other information can be observed on the controller display while the unit is in normal mode or in commissioning mode. This is available regardless whether the compressor is on or off. Use short button presses to cycle the display through the options. After 2 minutes the display automatically returns to a flashing dot (or ‘c’).

  • Page 19: Special Modes

    Temperzone UC8 Operation, OSA models with inverter, issue 1 Special modes The UC8 offers several options for making modifications to the operation of the unit. Operating the pushbutton in level 1: • Apply power to the unit and wait until the power-on sequence is completed.

  • Page 20: Factory Test Mode: T

    Temperzone UC8 Operation, OSA models with inverter, issue 1 10.1. Factory test mode: t In factory test mode the controller activates the various control board output signals one by one, with a pause between each step. When the test sequence is complete the controller automatically returns to normal mode.

  • Page 21: Thermostat Auto-On/Off Options: O

    This mode is intended for use only on cooling-only installations; it is unsuitable for installations that also require operation in heating mode. The thermostat is forced to remain off when the UC8 remote-on/off input is inactive. When the UC8 remote on/off signal becomes active the thermostat is automatically switched on in cooling mode.

  • Page 22: Troubleshooting

    Temperzone UC8 Operation, OSA models with inverter, issue 1 Troubleshooting When the UC8 controller detects a problem within the system the fault relay output (FLT) is activated. Fault light FLT will illuminate, and a fault code is shown on the LED display.
  • Page 23 Temperzone UC8 Operation, OSA models with inverter, issue 1 Display Meaning Possible causes Low pressure transducer fault Transducer cable disconnected Faulty transducer Loss of refrigerant (gas leak) High pressure transducer fault Transducer cable disconnected Faulty transducer Loss of refrigerant (gas leak)

  • Page 24: Inverter Fault Codes

    Temperzone UC8 Operation, OSA models with inverter, issue 1 11.2. Inverter fault codes The following set of fault codes relate to the Power+ compressor driver. The fault code shown on the controller is F100 plus the alarm code as reported by the Power+ driver.

  • Page 25: Uc8 Controller Circuit Board Specifications

    • It is recommended that any input signal that is referenced to EARTH and that needs to connect to a circuit external to the temperzone unit to be isolated by a suitable means, for example a relay. Typical examples of this are the remote On/Off input and the DRED inputs.
  • Page 26 Temperzone UC8 Operation, OSA models with inverter, issue 1 Isolated inputs When used with 24V AC input signals: Applies to: Maximum input voltage OFF state: 2V RMS AC HI, ME, LO, CP and HT inputs Minimum input voltage ON state:...
  • Page 27 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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