Figure 31 Hot Gas Bypass - Liebert Mini-Mate2 MMD24E User Manual

Adjustment
1. Install the suction and discharge pressure gauge.
2. Adjust temperature setpoint to call for cooling so that the refrigeration compressor will run
continuously.
3. Remove the TOP adjusting nut from the valve.
4. Insert an Allen wrench in the brass hole at top of valve in adjusting port and turn CLOCKWISE if
a higher evaporator temperature is required. Adjust no more than 1/4 turn at a time. Let the
system stabilize for 15 minutes before determining if additional adjustment are necessary.
5. After obtaining the suction pressure required, reinstall cap tightly making sure there are no
leaks.
6. Let the evaporator operate for approximately 10 to 15 minutes to make sure the suction pressure
is within the range desired.
7. There may be a fluctuation of approximately 3 to 6 PSIG (21 to 41kPa) on the evaporator due to
the differential on the hot gas bypass.
8. Return temperature setpoint to the desired setting.

Figure 31 Hot gas bypass

63
System Testing and Maintenance
®
Liebert Mini-Mate2
™