Liebert Challenger ITR - Manual (Page 42)

Glycol/GLYCOOL-Cooled Models
36
5.6 Condenser
The condenser is designed to operate in conjunction with a drycooler. The maximum coolant pressure
is 350 psig (2413 kPa).
5.7 Glycol Regulating Valve
The glycol regulating valve automatically regulates the amount of coolant necessary to remove the
heat from the refrigeration system, permitting more fluid to flow when load conditions are high and
less fluid to flow when load conditions are low. The valve consists of a brass body, balance spring,
valve seat, valve disc holders, capillary tube to discharge pressure, and adjusting screw.
5.7.1 Glycol Regulating Valve Adjustment
The Liebert Challenger ITR may be equipped with either a standard Johnson Controls valve, 150 psig
(1034 kPa) or with a high-pressure Johnson Controls valve, 350 psig (2413 kPa). For details on adjust-
ing the valve, refer to 4.3.1 - Water Regulating Valve Adjustment.
5.7.2 Testing Valve Function
When the refrigeration system has been off for approximately 10-15 minutes, the coolant flow should
stop.
Should the coolant continue to flow, the valve is either improperly adjusted or the pressure sensing
capillary is not connected properly to the condenser.
NOTE
For pressures above 150 psig (1034 kPa), the high pressure option for high pressure valve(s)
is required.
Table 18 Refrigerant control settings psi (kPa)
Low Pressure
Cut Out
Low Pressure
Cut In
High Pressure
Cut Out
20 (137.9) 65 (448.2) 360 (2482)