McQuay WHR 080 User Manual

CONDENSER
GENERAL - For proper performance, the condenser water
must enter the bottom connection of the condenser. Water
cooled condensers may be piped for use with cooling towers,
well water or heat recovery applications. Cooling tower ap-
plications should be made with consideration to freeze pro-
tection and scaling problems. For specific applications, con-
tact cooling tower manufacturer for equipment characteristics
and limitations.
HEAD PRESSURE CONTROL, TOWER SYSTEM
- Some
means of controlling operating head pressure must be pro-
vided. Minimum condensing temperature allowed is 80°F.
Minimum entering tower condenser water temperature is
70°F. Typical systems are shown in Figures 8 and 9. In Figure
8, a three-way pressure actuator water regulating valve is
used for cooling applications, In Figure 9 the capacity of the
cooling tower is controlled through damper and/or fan
WATER PIPING
modulation. These typical systems, depending on the specific
application, must maintain a constant condensing pressure,
regardless of temperature conditions and must assure
enough head pressure for proper thermal expansion valve
operation. Note also that both systems assure full water flow
to the tower.
HEAD PRESSURE CONTROL, WELL WATER SYSTEM -
Where well water is used for condensing refrigerant, a direct
acting water regulating valve is recommended (see Figure
10). The valve is normally installed at the outlet of the con-
denser. On shutdown, the valve will close and, in this way,
prevent water siphoning out of the condenser. Siphoning
causes drying of the waterside of the condenser and rapid
build-up of fouling. When no valve is used, a loop at the outlet
end is recommended (See Figure 10).
COOLING TOWER SYSTEMS-HEAD PRESSURE CONTROL
Figure 8. 3-Way Water Valve
Figure 9. Fan Modulation
REGULATING VALVES
TO
COOLING
BYPASS BALANCING
VALVES OR COCKS
Figure 10. Well Water Cooling System
I
LOOP REOUIAED WHEN NO
REGULATING VALVE IS USED
DIRECT ACTlNG WATER
REGULATING VALVE
COOLING TOWER
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McQuay WHR 080 Specifications

General

Brand	McQuay
Model	WHR 080
Category	Chiller
Language	English