Installation, Operation and Maintenance Manual
VariCool EZ-Fit
19
Subject to change without notice.
Blower Section
Before installing the blower section(s), make sure the
appropriate gasket material has been applied to the top of the
evaporator section and the compressor / condensing section
(Ref Figure 4, surfaces identified as “2”) Make sure the
alphabetical labels align properly for either a single module
or a dual module configuration Set the blower section(s) in
place and attach the 3D-Intelliclamps
Dual Module Units -- There is a 15 pin connector set to
join the low voltage controls from one module to the second
module The pin connector must be snapped together and
only fits in one direction
There is factory provided power wiring to connect one module
with the second module Route the power wiring from the
one control box to the other and attach to the appropriate
power terminals located in the second module
Duct Connections
Ductwork must be designed using applicable industry
standards and practices Use of turning vanes is
recommended Verify that the designed duct external static
pressure is in line with the capability of the unit blower /
motor provided
Connection to the unit supply air outlet flange must be made
using a field provided flexible collar
Units that incorporate the EC fans or the direct drive parallel
(DDP) fans should have the two supply outlets serve a
common duct arrangement
When dual modules are used in the application, a common
supply duct should be used between both modules
Ductwork and plenums shall be insulated in accordance with
applicable industry standards or local codes
Typically these units are installed using the mechanical
room as the return air plenum However, return ductwork
can be applied Sufficient duct flange area exists on the filter
frame for this purpose Field provided flexible collar should
be used
Make sure that all duct work is supported independently
from the equipment
INFORMATION
If the duct work is built in a manner that will
split into 2 separate supply ducts directly
off of the plenum,
contact the factory
immediately�
A “T” type configuration
must be very carefully designed and there
will be issues that must be addressed
or control of the static pressure, zones
temperature and supply control will be
adversely affected
Water Requirements
It is recommended that the water or coolant distribution
system be of proper PH and free from debris The filtration
used for this must be maintained as unmaintained filtration
systems that may cause low GPM will not be acceptable
operating conditions A minimum mesh strainer rated at 16-
20 mesh must be installed on the systems inlet piping 20-
40 mesh is the best choice and strongly recommended for
brazed plate heat exchanger applications Mesh pressure
drop must be assumed and is not considered when unit
pressure drop is provided The field must verify the proper
GPM supply to the unit
The water should be maintained at a ph of 74 and not less
than 70 or higher than 80 for proper heat exchanger life
If this is not possible the unit should be verified to have
had specialty coatings or heat exchanger coils installed if
reasonable life of the heat exchangers is to be expected
INFORMATION
Water-cooled units have been designed
for use with fresh water application only
Do not use for brackish water or salt water
unless appropriate condenser and water
piping has been applied
