Installation, Operation and Maintenance Manual
VariCool EZ-Fit
20
Subject to change without notice.
INFORMATION
It is advantageous to record the inlet and
water outlet temperatures and the heat
exchanger pressure drop during the unit
start-up procedure These are then a
valid reference point for maintenance
considerations in the future
The following items are to be field supplied and applied:
A�
Water shut-off valves (Gate or Ball Type)
B�
Inlet water strainer with isolation shut off valves on
each side for periodic cleaning
C�
Water flow switch
The standard condenser heat exchangers are co-axial type
These are tube-in-tube type that are chemically cleanable
The inner tube carries the water and the outer tube the
refrigerant When designing and installing the water piping,
Water Piping
WARNING
HEAT EXCHANGER FREEZE RISK:
Heat Exchanger will fail if operated at or
near the freezing point of water/glycol
mixture
The following precautions must be taken:
• At startup, fluid side must be started
first
• At shutdown, refrigerant side must be
shut down first
• Fluid side outlet must have temperature
monitoring and emergency shutdown
equipment in case temperature
approaches too close to the freezing
point
INFORMATION
Do not reduce the water inlet or outlet
connection size as this will restrict water
flow and increase water pressure drop
CAUTION
Ensure that the water pressure to the unit
does not exceed 250 psig
INFORMATION
All field installed piping must conform to
applicable local, state and federal laws
some consideration for the chemical cleaning should be
made if desired for future maintenance
In some units, the optional shell & tube condensers may be
incorporated Care must be taken when designing the water
piping and other items external to the unit to allow room for
mechanically cleaning the heat exchangers if required
INFORMATION
Factory inlet and outlet water connections
contain grooved end connections The
appropriate connection in the field
(grooved end, threaded etc) must be
field supplied Refer to Table 2 for Water
Connection Sizes
INFORMATION
Field supplied water piping must include
a pet cock or other suitable means at the
highest point to bleed air from the water
piping
IMPORTANT
Units have been tested at the factory
before shipment The test fluid at the
factory contains a glycol mixture It is
important to flush the internal unit piping
and heat exchangers at the job site prior to
start-up or connection to the cooling fluid
circuit being used
Summary of Contents for VariCool EZ-Fit Series
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