TemperZone UC8 User Manual

Temperzone UC8 Operation, OSA models with inverter, issue 1
Page 13 of 27
6.5. Oil recovery (oil flush) cycles
If the unit operates on low capacity for longer than 1 hour and 40 minutes the controller will perform
an oil recovery cycle. Oil recovery cycles are necessary to ensure sufficient lubricating oil returns to
the compressor. An oil recovery cycles takes 1 minute. During this one-minute the compressor speed
is increased and the EEV is directed to open.
It is possible to change the interval between oil recovery cycles (normally 1 hour and 40 minutes). It is
also possible to disable oil recovery cycles. If this is required contact temperzone customer service.
7. Dry mode (de-humidification)
OSA models provide three options for cooling mode:
Mode
Indoor fan speed
Standard cooling
Fixed
High-efficiency cooling
Variable
Dry cooling (de-humidification)
Variable
• Standard cooling mode:
This is the default mode. In this mode the controller does not actively control the indoor coil
temperature. De-humidification occurs only when the indoor coil temperature (= the refrigerant
evaporating temperature) is below the dew point. Under normal operating conditions the indoor fan
speed is kept equal to the speed requested by the thermostat.
Standard cooling mode is suitable for installations where indoor airflow must remain constant and/or
when de-humidification is not required.
• 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. De-humidification occurs only when the indoor coil temperature
is below the dew point.
High efficiency cooling mode may be unsuitable for installations where indoor airflow must remain
constant.
• Dry cooling mode (de-humidification):
The UC8 controller must be allowed to vary the indoor fan speed to obtain an indoor coil temperature
to that is below the dew point. The indoor fan speed can differ from the speed as requested by the
thermostat.
Dry cooling mode may be unsuitable for installations where indoor airflow must remain constant.
7.1. Dry mode and the SAT-3 thermostat
Refer to the SAT-3 installer and user manuals for configuring the SAT-3 thermostat.
To operate a unit in dry mode: Select cool + dry or auto cool / heat + dry, start the unit in cooling
mode. Select fan auto-speed (the word AUTO shows on the fan display).

TemperZone UC8 Specifications

General

Brand	TemperZone
Model	UC8
Category	Controller
Language	English