United CoolAir VariCool EZ-Fit Series User manual

VariCool®
EZ-Fit Series
Installation, Operation and Maintenance Manual
E󰀨ective March 2023
Variable Air Volume
Water-Cooled, Water Source Heat Pump

Installation, Operation and Maintenance Manual
VariCool EZ-Fit
3
Subject to change without notice.
Contents
Contents � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
Wiring Diagram � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4
Safety Introduction and Labeling Guide � � � � � � � � � � � � 5
General Information � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
Inspection of Equipment                         6
Handling                                      6
Location                                      6
Application Data                                6
Service Clearances� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
Single Modules                                7
Dual Modules                                  7
Condensate Drain� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
Physical Data � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
Dimensions & Weight� � � � � � � � � � � � � � � � � � � � � � � � � � � 10
Mounting and Placement� � � � � � � � � � � � � � � � � � � � � � � � 11
Mounting Options                              12
Cabinet Vibration Isolation Method Options         12
Suggested Assembly Sequence                  14
Evaporator Section                            14
Gasket Material                               14
Compressor / Condensing Section                14
Resealable Refrigerant Fittings                   15
3D-Intelliclamps                               16
Blower Section                                19
Duct Connections                             19
Water Requirements                           19
Water Piping                                 20
Electrical and Controls                          21
Power Wiring                                 21
Transformer                                  22
Voltage Unbalance                             22
High Duct Static Pressure Switch                 22
Low Voltage Control Devices                     22
Wall Display                                  22
BMS Applications                              23
Static Pressure Transducer                      23
Supply Air Temperature Sensor                   23
Return Air Temperature Sensor                   23
Sequence of Operation Manuals                  23
Single-Zone Variable Air Volume                  23
Multi-Zone Variable Air Volume                   23
Constant Air Volume                           23
Water Flow Switch Installation                    24
Maintenance Procedures� � � � � � � � � � � � � � � � � � � � � � � � 25
Filters                                       25
DWDI Blowers                                25
Lubrication                                   25
Belt Driven (DWDI)                            25
Belt Tensioning                               26
Direct Drive Blowers                           26
Drain Pan                                    24
Evaporator Coil                               27
Condenser                                   27
Water Side Economizer Coil                     28
Water Valves                                 28
Refrigerant Systems                           28
Operations Verication Check List� � � � � � � � � � � � � � � � 29
Troubleshooting Guide � � � � � � � � � � � � � � � � � � � � � � � � � 30
Limited Warranty � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 33
Water-Cooled Unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 34
Start-Up Procedures � � � � � � � � � � � � � � � � � � � � � � � � � � � 36
Product Nomenclature� � � � � � � � � � � � � � � � � � � � � � � � � � 40
Maintenance Log � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 41

Installation, Operation and Maintenance Manual
VariCool EZ-Fit
4
Subject to change without notice.
Wiring Diagram
To retrieve the unit wiring diagram, scan the wiring diagram QR Code label a󰀩xed near the unit data tag This will link to
the wwwunitedcoolaircom website Scroll down to the Serial Search box and enter the unit serial number
The serial number is a combination of the year, month and sequential order of build date
This will return the Model Number, Job Number and the Wiring Diagram for viewing as well as downloading
Wiring diagrams are available for units shipped since November 2016 For older units, please contact the factory at
wwwunitedcoolaircom/general-inquiry/.

Installation, Operation and Maintenance Manual
VariCool EZ-Fit
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Subject to change without notice.
This signies a critical procedural step
that is required by the end user
IMPORTANT
Safety Introduction and Labeling Guide
The electrical hazard icon indicates the
presence of an electrical hazard which
could result in electrical shock or death
The warning icon indicates a potentially
hazardous situation which could result
in death or serious bodily injury if not
avoided
The caution icon indicates a potentially
hazardous situation which may result in
minor or moderate injury if not avoided
The information icon indicates a situation
that may result in equipment or property
damage The information provided
alerts the reader to relevant facts and/or
conditions
ELECTRICAL HAZARD
WARNING
CAUTION
INFORMATION
Your Safety is Important to Us!
Please follow and understand the rules and the instructions
contained herein carefully Failure to do so could cause a
malfunction of the HVAC equipment, resulting in injury,
death and/or property damage Throughout this manual,
and in specic places on the unit itself, the signal words
ELECTRICAL HAZARD, WARNING and CAUTION are
used to identify levels of hazard seriousness IMPORTANT
and INFORMATION will be used in areas where there is
important information but not hazard related
These instructions, local codes and ordinances and
applicable standards that apply to piping, electrical wiring,
ventilation, etc must be thoroughly understood before
proceeding with the installation
Protective gear is to be worn during installation, operation
and service in accordance to the Occupational Safety and
Hazard Administration (OSHA) Gear must be in accordance
to NFPA 70E, latest revision when working with electrical
components Thin sheet metal parts have sharp edges
To prevent injury, the use of work gloves is recommended
This equipment must be applied and operated under the
general concepts of reasonable use and installed using best
building practices
This equipment is not intended for use by persons (including
children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning
use of the equipment by a person responsible for their safety
Children should be supervised to ensure that they do not
play with the equipment
To obtain additional copies of the Installation, Operation and
Maintenance Manual, please contact United CoolAir For
detailed information regarding specications, dimensional
drawings, and weight information, contact your local United
CoolAir manufacturer’s representative

Installation, Operation and Maintenance Manual
VariCool EZ-Fit
6
Subject to change without notice.
General Information
This manual covers most unit congurations Since many
unit are built-to-order some of the information provided may
not directly apply to this specic unit
Inspection of Equipment
IMPORTANT
Upon receiving of the unit, carefully inspect
all sections for visible or concealed interior
/ exterior damage
United CoolAir has factory run tested this unit and has taken
photographs post testing for verication and reference in
case of any damage incurred during transportation, handling
or rigging If you have led a freight damage claim and
require pre-transportation photos please contact United
CoolAir’s local manufacturer’s representative with the serial
number
If damage occurred during transit, contact the freight carrier
immediately and le a damage claim report
Inspect the unit data plate to verify the model unit that was
ordered is what has been received
Some options / accessory items may have been shipped
loose in one or more boxes These may have been delivered
to another location, or possibly within the unit If shipped with
the unit there will be a sticker that identies where in the
unit the shipped loose items are located Conrm that all of
these options / accessory items are also available and that
no damage has occurred
Handling
To help facilitate handling, most units or modules are shipped
on a wooden skid Use caution when moving the unit or
modules so that damage does not occur when moving each
piece to the nal installation location within the structure
The units or modules can be moved by the use of a crane,
fork lift, pallet jack or roller bars as appropriate Under no
circumstances should the unit or modules be “walked” on
the corners of the skid or unit
If a crane, cables or slings are used to move a unit or module,
spreader bars must be used to protect each section’s cabinet
structure
INFORMATION
Unit should NOT be located in space
subject to freezing temperatures
Location
Before unit can be installed, a thorough study should be
made of the structure Attention must be given to:
A� Floor, ceiling or wall load limitations as appropriate
B� Required service clearances
C� Condensate removal, trapping and disposal
D� Location of wiring and safety devices
E� Ductwork sizing and connections are per industry
standards
F� Maintenance access
G� Mounting location is level in both horizontal planes
H� Water piping location and connection conguration
I� An EZ-Fit Frame Cart is available to verify that
the largest cabinet section of a unit will t through
doorways, around corners and onto elevators Contact
United CoolAir’s local manufacturer’s representative for
access to the Frame Cart
Application Data
Cooling
(Air Entering Evaporator)
DB
(min./max.) 65 / 110
WB 57 / 72
Water-Cooled
GPM / Ton
(min./max.) 2.5 / 3.5
Leaving Water
(min./max.) 60 / 115
Note: Not all combinations may be valid.
Voltage 280 / 230 460
Variation 187 / 253 414 / 504

Installation, Operation and Maintenance Manual
VariCool EZ-Fit
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Subject to change without notice.
Service Clearances
SERVICE
ACCESS
SERVICE ACCESS
FILTER ACCESS
FRONT
SERVICE ACCESS
SERVICE
ACCESS
FILTER ACCESS
LEFT HAND
TOP VIEW
FRONT
SERVICE
ACCESS
36
24
24
24
SERVICE ACCESS
SERVICE
ACCESS
FILTER ACCESS
RIGHT HAND
TOP VIEW
FRONT
SERVICE
ACCESS
36
24
24
24
36
24
24
24
Single Module
Dual Module
Notes:
(a) Service clearances apply to all air path configurations
(b) Service clearances apply to all size units
SERVICE
ACCESS TOP VIEW
Additional Clearance
required for ECM &
DDP Fans Only
SERVICE
ACCESS
SERVICE ACCESS
FILTER ACCESS
FRONT
SERVICE ACCESS
SERVICE
ACCESS
FILTER ACCESS
LEFT HAND
TOP VIEW
FRONT
SERVICE
ACCESS
36
24
24
24
SERVICE ACCESS
SERVICE
ACCESS
FILTER ACCESS
RIGHT HAND
TOP VIEW
FRONT
SERVICE
ACCESS
36
24
24
24
36
24
24
24
Single Module
Dual Module
Notes:
(a) Service clearances apply to all air path configurations
(b) Service clearances apply to all size units
SERVICE
ACCESS TOP VIEW
Additional Clearance
required for ECM &
DDP Fans Only

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VariCool EZ-Fit
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Subject to change without notice.
Condensate Drain
Each EZ-Fit evaporator has a condensate drain connection
in the base frame (Ref Figure 1) If the application contains
dual modules two (2) drain traps are required
Traps will need to be connected to the 1-1/4” NPT drain
connection(s) (Ref Figure 1)
A condensate drain trap must be eld fabricated and installed
The purpose of the trap is to neutralize the negative pressure
created within the blower cabinet
The negative pressure can vary from less than 1” up to 3”
column The condensate trap must be of su󰀩cient depth
in water column to permit the condensate to ow from the
drain pan Failure to have a su󰀩cient drain trap will cause
the condensate to overow the drain pan or to cause the unit
to shut down on the drain pan overow safety
The “A” dimension (Ref Figure 2) must equal or exceed the
negative static pressure developed by the supply air blower
The “A” dimension will be unique for each unit application
The trap must be 2-1/2” deep to maintain a water seal under
all operating conditions, especially during blower start-up
It is highly recommended that the trap be primed with water
prior to start-up
Each trap must be piped to a suitable waste drain
Plugged
Removable
Cleanout
A
25
Min
35
Figure 2 - Condensate Trap Dimensions
Condensate Drain
1-1/4" NPT 4276
1047
Figure 1 - Condensate Drain Location

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VariCool EZ-Fit
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Physical Data
Single Module
Nominal Tons Blower Type Filter Size Evap. Coil Compressor R-410A
ECM iDDP DWDI Qty Size (in) Rows FPI Qty Lbs/Ckt
15 • • • 4 / 2 15x20 / 20x20 4 14 2 7
20 • • • 6 18x25 4 14 2 10.8
25 • • • 6 18x25 4 14 2 11.8
30 • • 6 / 3 24x20 / 20x20 5 14 2 15
35 • • 2 / 5 / 2 20x20 / 20x24 / 24x24 5 14 2 20
40 • • 3 / 6 14x24 / 25x25 6 14 2 24.1
45 • • 3 / 6 14x24 / 25x25 6 14 2 27
Dual Module
Nominal Tons Blower Type Filter Size Evap. Coil Compressor R-410A
ECM iDDP DWDI Qty Size (in) Rows FPI Qty Lbs/Ckt
30 • • • 8 / 4 15x20 / 20x20 4 14 4 7
40 • • • 12 18x25 4 14 4 10.8
50 • • • 12 18x25 4 14 4 11.8
60 • • 12 / 6 24x20 / 20x20 5 14 4 15
70 • • 4 / 10 / 42 20x20 / 20x24 / 24x24 5 14 4 20
80 • • 6 / 12 14x24 / 25x25 6 14 4 24.1
90 • • 6 / 12 14x24 / 25x25 6 14 4 27
1. Standard Filters - 2” MERV 13, Optional Filters - 2” MERV 8 Pre- and 4” MERV 13 Final
2. Total Unit Working Fluid Pressure:
Coaxial Condenser (Std. A/C) - up to 250 psig
Brazed Plate Condenser (Std. WSHP) - up to 250 psig
Shell and Tube Condenser (Option) - up to 150 psig

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Assembled Unit
Cabinet Sections
Single Module Dual Module
Nominal
Tons
Unit Weight Nominal
Tons
Unit Weight
W1D1,2 HECM iDDP DWDI W1D1,2 HECM iDDP DWDI
15 55-1/2 49-5/8 88-1/8 1635 1675 1650 30 110-1/2 49-5/8 88-1/8 3270 3350 3300
20-25 65-1/2 52-1/8 93-1/8 2200 2250 2175 40-50 130-1/2 52-1/8 93-1/8 4400 4500 4350
30 70-1/2 58-1/8 105-1/8 3140 3140 N/A 60 139 56-5/8 105-1/8 6280 6280 N/A
35 77-1/2 60-1/8 105-1/8 3660 3780 N/A 70 153 58-5/8 105-1/8 7320 7560 N/A
40-45 77 59-1/2 112 4220 4350 N/A 80-90 152-1/2 58 112 8440 8700 N/A
Single Module
Nominal
Tons
Condensing Section Evaporator Section Fan Section (Each)
Qty W1D1H Wgt Qty W1D1,2 H Wgt Qty W1D1H Wgt3
15 1 55-1/2 32-1/4 56 800 1 55-1/2 17-1/4 56 375 1 55-1/2 49-5/8 32 460
20-25 1 65-1/2 34-3/4 59 1075 1 65-1/2 17-1/4 59 525 1 65-1/2 52-1/8 34 600
30 1 70-1/2 34-3/4 71 1340 1 70-1/2 23-1/4 71 1000 2 35-1/4 58-1/8 34 400
35 1 77-1/2 34-3/4 71 1570 1 77-1/2 25-1/4 71 1170 2 38-3/4 60-1/8 34 460
40-45 1 77 34-1/2 78 1850 1 77 25 78 1450 2 38-1/2 59-1/2 34 460
Dimensions and Weights

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VariCool EZ-Fit
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Supply Air Opening
Dimensions and Weights
Dual Module
Nominal
Tons
Condensing Section (Each) Evaporator Section (Each) Fan Section (Each)
Qty W1D1H Wgt Qty W1D1,2 H Wgt Qty W1D1H Wgt3
30 2 55-1/2 32-1/4 56 800 2 55-1/2 17-1/4 56 375 2 55-1/2 49-5/8 32 460
40-50 2 65-1/2 34-3/4 59 1075 2 65-1/2 17-1/4 59 525 2 65-1/2 52-1/8 34 600
60 2 70-1/2 34-3/4 71 1340 2 70-1/2 23-1/4 71 1000 4 35-1/4 58-1/8 34 400
70 2 77-1/2 34-3/4 71 1570 2 77-1/2 25-1/4 71 1170 4 38-3/4 60-1/8 34 460
80-90 2 77 34-1/2 78 1850 2 77 25 78 1450 4 38-1/2 59-1/2 34 460
1. Dimension (in.) includes hardware.
2. Dimension (in.) does not include depth of removeable Filter Rack. Filter rack depth is 5 to 24 inches, based on combination of
options installed (2” and/or 4” lters plus aux. coil or elec. heat).
3. Weight (lbs.) with ECM Fans
NOTE: Alternate Narrow cabinet is available. See www.unitedcoolair.com website for drawings.
Single Dual ECM1iDDP1DWDI2
Nominal Tons Front Top Rear Front Top Rear Front Top Rear
15 30 17-5/8 x 24
N/A
17-5/8 x 24 18-7/8 x 16-1/8
20-25 40-50 15-1/2 x 25 15-1/2 x 25 22-1/8 x 18-7/8
30 60 15-1/2 x 25 15-1/2 x 25
N/A35 70 19 x 25 19 x 25
40-45 80-90 19 x 25 19 x 25
1. Quantity two fans per module
2. Quantity one fan per module

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Mounting and Placement
Mounting Options
When installing any oor mounted unit, some form of
vibration isolation is required
The EZ-Fit cabinet has one (single) or two (dual) modules
Each module has three or more cabinet sections The EZ-
Fit requires support on the corners, the middle of each
section, and wherever sections come together If the entire
cabinet base of each section is not supported, refrigeration
pipe breakage and/or coil leaks will occur, and the warranty
coverage will be void
Cabinet Vibration Isolation Method
Options:
One of the following recommended cabinet vibration
isolation methods are required and must be provided by
the eld Keep in mind that su󰀩cient height of the cabinet
vibration isolation must account for the required height of
the condensate drain trap
1 Steel Frame with Spring Isolation – Fabricate a steel
frame to provide support around the entire perimeter
of the unit Allow su󰀩cient clearance for any door or
panel access that is required to provide eld service or
maintenance on the unit The frame will also need to be
designed with suitable cross bracing See Figure 3B and
notice that the middle beam supports the mid-section of
the unit Field supplied spring vibration isolators are to
be installed on each corner of each frame per module
2 Channel Steel with Wa󰀪e Pads - Obtain channel steel
rail of an approved gauge to support the unit weight
and place underneath the unit in 4 locations per single
module or 7 locations per dual module, see Figure 3C
Place wa󰀪e pad type furnace pads underneath the
channel steel rail inside the “C” facing down for sound
dampening It is important that the channel steel rail
does not touch the ground or sound dampening will not
occur All the rails must be level before placing the unit
atop them Please note the locations of the pads
3 Wa󰀪e Pads Only - If cabinet height prevents adequate
space for framing, wa󰀪e pads alone may be used,
reference Figure 3E It is highly recommended that each
IMPORTANT
The assembled EZ-Fit cabinet has not
been designed for corner point only
loading with vibration isolators
pad be of identical height and that the pads are kept no
smaller than 4”x 4” You will need at minimum 30 pads to
support the EZ-Fit properly Additional pads, more than
the specied count, will improve the support of the unit
The goal is to keep the middle of the unit from sagging
Support under the compressors and water coils is key
Figure 3B - Base Option 1 - Unit View - Single Module
Figure 3A - Base Option 1- Steel Frame with Spring Isolation

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Figure 3C - Base Option 2 - Channel Steel with Wafe Pads
- Bottom View
Figure 3D - Base Option 2 - Unit View - Single Module Figure 3F - Base Option - Unit View - Single Module
Figure 3E - Base Option 3 - Wafe Pads Only - Bottom View

Installation, Operation and Maintenance Manual
VariCool EZ-Fit
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Subject to change without notice.
Suggested Assembly Sequence
1� Set Evaporator section in place
2� Set Compressor / Condensing section in place
a� On Dual Module systems connect the factory
provided water pipes between modules
3� Connect resealable refrigerant ttings
4� Attach 3D-Intelliclamps
5� Set Blower section in place
NOTE: If space is limited in the mechanical room it may
be advantageous to suspend the blower section(s)
temporarily as the initial step�
6� Attach 3D-Intelliclamps
a� On Dual Module systems connect the factory
provided power and control wiring from one module
to the other
Each module has three or more cabinet sections Dual
modules have a left hand and a right hand module
Each section will be labeled as to which system it is These
labels are typically something such as AC-1, AC-2 or AHU-
1, AHU-2, etc Make sure when mating up the sections that
each section is correctly matched for the appropriate module
Additionally, when a dual module system is being assembled
there will also be an indication as to which sections are
left hand (LH) or right hand (RH) Left and Right hand is
determined when viewing the unit from the control box side
(side opposite the lters)
Each section is also alphabetically labeled so that each
section can be mated properly Set the sections so that point:
A aligns to A
B aligns to B
C aligns to C
Evaporator Section
Start by locating the evaporator section rst Set each section
as needed, making sure that in dual module applications the
evaporator sections are placed correctly as left hand and
right hand
Gasket Material
Gasket material has been factory supplied for eld
installation between each unit section The gasket material
must be installed to minimize air leakage and to help reduce
transmission of noise
Before applying any gasket material make sure the surface
is clean and dry
Gasket material, 3” wide, should be applied to those surfaces
identied as “3” in Figure 4 (evaporator and compressor /
condensing section)
Gasket material, 2” wide, should be applied to those surfaces
identied as “2” in Figure 4 (evaporator and compressor /
condensing section)
Compressor / Condensing Section
Next, locate the compressor / condensing section(s) Make
sure the alphabetical labels align properly for either the single
module or dual module conguration Set the compressor /
condensing section(s) in place
Dual Module Units - Condenser water piping for dual
module units are a single water inlet and outlet Piping and
grooved end couplings are factory provided to connect the
two modules together These items are shipped loose with
the sections

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Figure 4 - Gasket Material
An insulation piece is factory installed between the module
sections to seal any possible air leakage where the water
piping passes through the cabinets Cut a hole in the
insulation to feed both the inlet and outlet water piping
through
Install the pipes and attach to the existing unit piping using
the grooved end couplings Hand tighten the bolts on
the grooved end couplings until all interconnecting piping
connections are made Then, fully tighten all the bolts as
necessary
The interconnecting piping needs to be wrapped to minimize
any condensate forming on the piping The same gasket
material used to seal between the cabinet sections can be
used
Resealable Refrigerant Fittings
All units are shipped from the factory with a full factory
refrigerant charge The resealable refrigerant ttings must
be connected and properly tightened to facilitate refrigerant
ow between the evaporator and compressor / condensing
section
For shipping purposes the refrigerant ttings are held in place
to the cabinet using vinyl coated hangers and a mounting
bracket These are to be removed before the refrigerant
ttings are connected
1� On the refrigerant resealable ttings, apply a few drops
(5 to 6 droplets are recommended) of refrigerant oil to
the male coupling halves before starting the assembly
(Ref to Figure 6)
2� Align each resealable tting and hand thread the female
tting onto the male tting (Ref to Figure 6) Continue
to hand thread until resistance is observed
3� Once slight resistance is evident, continue to tighten
the ttings using the appropriate size wrenches listed in
Table 1 Please note that it is important to support the
male side of the tting with a wrench when tightening
the female side with a wrench
Figure 6 - Resealable Fittings
4� If the resealable ttings still feel loose, tighten a bit
more as required
INFORMATION
Count the number of threaded rotations
Use Table 1 to determine how many total
rotations are required for proper sealing of
the ttings
Apply oil to male threads
Female Fitting
Male Fitting
Clockwise Rotation

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VariCool EZ-Fit
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Subject to change without notice.
3D-Intelliclamps
Each section of a single module is furnished with
3D-Intelliclamps to facilitate connection to the adjacent
section These have been installed at the factory during
production and consist of two interlocking halves that mate
and are then bolted together Once tightened, they ensure
perfect alignment of the mating section surfaces
Once adjacent sections have been put into place, use the
included hardware to pull sections together until the curved
surfaces of the 3D-Intelliclamps are completely mated
3D-Intelliclamp
Size Wrench Full Turns Required
3/8" 1-3/16" 6
1/2" 1-3/16" 6
5/8" 1-5/8" 7-3/4
3/4" 1-5/8" 7-3/4
7/8" 1-5/8" 8
1-1/8" 2" 8
Table 1 - Resealable Fitting Turns
INFORMATION
If low refrigerant pressure is evident during
the start-up process, check the tightness
of all resealable ttings A tting that is not
fully open will restrict refrigerant ow

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VariCool EZ-Fit
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Subject to change without notice.
Figure 5A - Single Module
TYPICAL 8 PLACES

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VariCool EZ-Fit
18
Subject to change without notice.
Figure 5B - Dual Module
TYPICAL
16 PLACES

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VariCool EZ-Fit
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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 identied as “2”) Make sure the
alphabetical labels align properly for either a single module
or a dual module conguration 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 ts 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 ange must be made
using a eld provided exible 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 Su󰀩cient duct ange area exists on the lter
frame for this purpose Field provided exible 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
o󰀨 of the plenum, contact the factory
immediately� A “T” type conguration
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 a󰀨ected
Water Requirements
It is recommended that the water or coolant distribution
system be of proper PH and free from debris The ltration
used for this must be maintained as unmaintained ltration
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 eld must verify the proper
GPM supply to the unit
The water should be maintained at a ph of 74 and not less
than 70 or higher than 80 for proper heat exchanger life
If this is not possible the unit should be veried 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

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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 eld supplied and applied:
A� Water shut-o󰀨 valves (Gate or Ball Type)
B� Inlet water strainer with isolation shut o󰀨 valves on
each side for periodic cleaning
C� Water ow 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, uid side must be started
rst
• At shutdown, refrigerant side must be
shut down rst
• 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
ow and increase water pressure drop
CAUTION
Ensure that the water pressure to the unit
does not exceed 250 psig
INFORMATION
All eld 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 eld
(grooved end, threaded etc) must be
eld 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 uid at the
factory contains a glycol mixture It is
important to ush the internal unit piping
and heat exchangers at the job site prior to
start-up or connection to the cooling uid
circuit being used