Owners Manual
Quantum Energy Technologies
6l: Optional Controls
6l.1: Hot Gas Bypass (for 67ACW- 417, 67ACP2-xxx, 67ACB-xxx)
Hot gas bypass is a system for maintaining evaporator pressure at or above a minimum value. The
purpose for doing this is to keep the velocity of the refrigerant, as it passes through the evaporator,
high enough for proper oil return to the compressor when the ambient temperature is very low.
The solenoid valve should be wired to open whenever the liquid line solenoid valve is energized.
This can be accomplished by wiring the hot gas solenoid in parallel with the liquid line solenoid.
The pressure control is factory set to begin opening at 200kPa.
6m: Trouble Shooting
WARNING
The hot gas line may become hot enough to cause injury in a very short time.
Avoid contact during valve maintenance.
WARNING
Trouble shooting can present risks of severe personal injury or death from burns,
cuts, electrocution, strangulation and asphyxiation. Troubleshooting must be done
by trained, experienced technicians only.
Document Number : QDC0049PD-5
Page 28 of 33
