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Liebert
®
Challenger 3000
™
74
7.6 Water and Glycol-Cooled Condensing Units
For installation guidelines, refer to Installing the Indoor Condensing Unit on page 67.
7.6.1 Piping Considerations
It is recommended that manual service shutoff valves be installed at the supply and return line to
each unit. This will provide for routine service or emergency isolation of the unit.
When the water source for the condenser is of poor quality, it is good practice to provide cleanable
filters in the supply line. These filters will trap the particles in the water supply and extend the
service life of the water-cooled condenser.
3-Ton Connection Sizes
5-Ton Connection Sizes
7.6.2 Condenser Water Requirements
The standard maximum water pressure is 150 psig (1034 kPa). For applications above this pressure,
consult the factory about high pressure systems.
The system will operate in conjunction with a cooling tower, city water, or drycooler.
7.6.3 Regulating Valve
For details, refer to sections 4.3.1 - Standard Valve - 150psig (1034kPa) System for 3 & 5-Ton
Units (Johnson Controls Valve) High Pressure Valve - 350psig (2413kPa) System for 5-Ton
Units (Johnson Controls Valve) and 4.3.2 - High Pressure Valve - 350 psig (2413 kPa) System
for 3-Ton Units (Metrex Valve).
Condenser Water Inlet 7/8" OD Cu
Condenser Water Outlet 7/8" OD Cu
Suction Line 1-1/8 - 12 male #11 quick connect
Liquid Line: 5/8 - 18 male #6 quick connect
Condenser Water Inlet 1-1/8" OD Cu
Condenser Water Outlet 1-1/8" OD Cu
Suction Line 1-7/16" - 16 male #12 quick connect
Liquid Line 1-1/16" - 12 male #10 quick connect
Table 32 Water and glycol-cooled condensing unit data
Model
Net Weight,
lb (kg)
Glycol Volume,
gal (l)
MC_44W
MC_43W
200 (91) 1.7 (6.4)
MC_69W
MC_68W
282 (128) 2.0 (7.6)