Trane TVR Pro CO 4TVY0096H8000AA User Manual

32
6.2 Oil Return Operation
In order to prevent compressors from running out of oil, the oil return operation is conducted to recover oil that has
flowed out of the compressor(s) and into the piping system. This operation is performed for all units including units that
are in standby. When the outdoor unit is running in oil return, the digital display on outdoor main PCB will display “d0”.
Timing of oil return operation:
 When the initial cumulative operating time reaches 140 minutes and then every 8 hours.
Tables 3-6.1 and 3-6.2 show component control during oil return operation in cooling mode.
Table 3-6.1: Outdoor unit component control during oil return operation in cooling mode
Component
Wiring diagram label
8-12HP
14-16HP
18-22HP
24-30HP
Control functions and states
Inverter compressor A
BP1
● ● ● ●
Fixed frequency
Inverter compressor B
BP2
● ●
DC fan motor A
FAN1
● ● ● ●
Controlled according to
discharge pressure
DC fan motor B FAN2 ● ●
Electronic expansion valve A
EXVA
● ● ● ●
Position 480 (steps)
Solenoid valve (Liquid injection)
SV2
● ● ● ●
Normal control
Solenoid valve (oil balance)
SV4
● ● ● ●
Normal control
Solenoid valve (refrigerant bypass)
SV7
● ● ● ●
Normal control
Table 3-6.2: Indoor unit component control during oil return operation in cooling mode
Component Unit state Control functions and states
Fan
Thermo on Remote controller setting
Standby Off
Thermo off Off
Electronic expansion valve
Thermo on Normal control
Standby 300 (steps)
Thermo off 300 (steps)

Trane TVR Pro CO 4TVY0096H8000AA Specifications

General

Brand	Trane
Model	TVR Pro CO 4TVY0096H8000AA
Category	Air Conditioner
Language	English