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Aaron RichardsonSep 1, 2025
What causes over-voltage on TemperZone UC8?
- CChristopher HollandSep 1, 2025
If the over-voltage protection is active on your TemperZone Controller, it is due to the mains supply voltage being too high.
To Next PageTo Next PageWhat causes over-voltage on TemperZone UC8?
If the over-voltage protection is active on your TemperZone Controller, it is due to the mains supply voltage being too high.
What causes mains input voltage too low on TemperZone UC8 Controller?
If the mains input voltage is too low on your TemperZone Controller, it is because the mains supply voltage is too low.
What causes mains input voltage too high on TemperZone UC8 Controller?
If the mains input voltage is too high on your TemperZone Controller, it is caused by the mains supply voltage being too high.
What causes high compression ratio protection in TemperZone Controller?
If the high compression ratio protection is active on your TemperZone Controller, it could be due to a pressure transducer fault, an EEV malfunction or disconnection, or an indoor fan or controller malfunction.
What causes drive over-current in TemperZone UC8?
If the drive over-current is detected in your TemperZone Controller, it may be due to an incorrect compressor model being selected, insufficient airflow, or a fan malfunction.
What causes motor over-current in TemperZone UC8?
If the motor over-current is detected in your TemperZone Controller, it may be due to an incorrect compressor model being selected, insufficient airflow, or a fan malfunction.
What causes high temperature protection to activate on TemperZone UC8 Controller?
If high temperature protection is active on your TemperZone Controller, it may be caused by insufficient airflow (e.g., a blocked air filter) or an indoor fan malfunction.
Why is indoor coil frost protection active on TemperZone Controller?
If the indoor coil frost protection is active on your TemperZone Controller, this could be due to insufficient airflow, such as a blocked air filter, or an indoor fan malfunction.
What causes high discharge superheat protection on TemperZone UC8?
If the high discharge superheat protection is active in your TemperZone Controller, it may be caused by a loss of refrigerant (gas leak), a faulty transducer, or an EEV malfunctioning or disconnected.
General| Input Voltage | 24 VAC |
|---|---|
| Output Voltage | 24 VAC |
| Humidity Range | 10% to 90% RH (non-condensing) |
| Enclosure Rating | IP20 |
| Controller Category | HVAC Controller |
| Operating Temperature | -20 to 70 °C |
Covers mains power terminals (L, N, EARTH) and various low voltage signals.
Details connections for temperature sensors (DL, SL, AMB, DEI) and their wire colours.
Details connections for pressure transducers (HPT, LPT) and their pressure ranges/outputs.
Explains isolated inputs for compressor, fan speed, and capacity control (HI, ME, LO, CAP, HT).
Describes Modbus RTU serial communication ports for BMS and thermostats.
Configures indoor/outdoor fan behavior, outdoor fan type, and expansion valve arrangement.
Selects the EEV type and sets the unit's role as standalone master or slave.
DIP switches 13-16 are used to identify the unit models as OSA and OPA.
Illustrates the typical wiring connections for SAT-3 and TZT-100 room thermostats.
Details Modbus RTU settings for SAT-3 (address 8) and TZT-100 (address 7) thermostats.
Describes the UC8's RS485 port for connecting to external building management systems (BMS).
Guidelines for establishing a reliable communication link between outdoor and indoor units using shielded cables.
Shows standard wiring diagrams for connecting one outdoor unit to one or two indoor units.
Details initial capacity (33%) and control options: 0-10V, thermostat, Modbus RTU.
Explains the automatic oil recovery cycles performed to ensure compressor lubrication.
Details cooling modes (Standard, High-efficiency, Dry) and dry mode setup with SAT-3 thermostat.
Describes how to configure and operate the unit in dry mode using a TZT-100 thermostat.
Lists available fan control inputs and provides important notes on fan speed variation.
Covers adjusting fan speed settings via UC8 and translating 0-10V VF input to fan output.
Lists and explains display codes shown on the UC8 LED, such as version, delay, and fault indicators.
Shows display codes for key operational parameters like pressures, temperatures, and capacity.
Details how to access factory test (t), commissioning (c), and fan speed (H, L) adjustment modes.
Covers Modbus address, SAT control, communication, and model selection settings.
Critical steps for selecting the correct compressor model (E) and EEV operating mode (n).
Configures thermostat auto on/off synchronization with the UC8 remote on/off signal.
Explains fault indication via FLT light/display codes and unit unlocking procedures.
Lists common fault codes (LP, HP, OL, FROST, HI-t, etc.) and their potential causes.
Lists specific fault codes (F100-F199) related to the Power+ compressor driver.
Details operating conditions, mains input, and ratings for output relays.
Covers isolated inputs, analogue I/O, digital inputs, and sensor interfaces.
Lists baud rate, data bits, parity, and stop bits for Modbus RTU serial communication.