Pentair WCHE Series User manual

© 2013 Pentair Equipment Protection 89087984
Rev. G P/N 89087983
Air-To-WATer HeAT excHAngers
WcHe Models
INSTRUCTION MANUAL

© 2013 Pentair Equipment Protection 89087984
- 2 -
NOTE: Please read this manual carefully before installing the unit. This user manual is an
integral part of the product and should accompany it until it is eventually disassembled.
TABLE OF CONTENTS
HOW TO CONSULT THIS MANUAL.................................................................................................................................................................... 3
THIS MANUAL IS INTENDED FOR THE FOLLOWING: .........................................................................................................................................................3
PURPOSE OF THE INFORMATION CONTAINED IN THIS MANUAL:....................................................................................................................................3
RESTRICTIONS TO THE USE OF THIS MANUAL ..................................................................................................................................................................3
WHERE AND HOW TO STORE THIS MANUAL ......................................................................................................................................................................3
CURRENT TECHNOLOGY ......................................................................................................................................................................................................3
UPDATES ...............................................................................................................................................................................................................................3
IN THE EVENT OF SALE OF THE PRODUCT.........................................................................................................................................................................3
UNPACKING AND INSPECTION........................................................................................................................................................................ 4
Included in the carton: ..........................................................................................................................................................................................................4
UNIT IDENTIFICATION ..........................................................................................................................................................................................................4
SAFETY REMARKS ............................................................................................................................................................................................ 5
PRECAUTIONS WHEN HANDLING THE UNIT......................................................................................................................................................................5
OPERATING PRINCIPLE.................................................................................................................................................................................... 6
COOLING CAPACITY ..............................................................................................................................................................................................................7
Performance Data WCHE019 Series ....................................................................................................................................................................................7
Design Data WCHE019 Series........................................................................................................................................................................... 8
Performance Data WCHE049 Series ....................................................................................................................................................................................9
Design Data WCHE049 Series......................................................................................................................................................................... 10
Performance Data WCHE069 Series ..................................................................................................................................................................................11
Design Data WCHE069 Series......................................................................................................................................................................... 12
Performance Data WCHE149 Series ..................................................................................................................................................................................13
Design Data WCHE149 Series......................................................................................................................................................................... 14
INSTALLATION INSTRUCTIONS...................................................................................................................................................................... 15
Installation...........................................................................................................................................................................................................................15
WATER CONNECTIONS.......................................................................................................................................................................................................16
MECHANICAL PARTS ...................................................................................................................................................................................... 18
STRUCTURE ........................................................................................................................................................................................................................18
HEAT EXCHANGE BANK .....................................................................................................................................................................................................18
CONDENSATE COLLECTION BASIN...................................................................................................................................................................................18
FLOW CONTROL SOLENOID VALVE....................................................................................................................................................................................18
MOTORS ........................................................................................................................................................................................................... 19
FANS ....................................................................................................................................................................................................................................19
CONTROL, MONITORING AND SAFETY COMPONENTS ................................................................................................................................ 19
REGULATING THERMOSTAT FOR SOLENOID VALVE.........................................................................................................................................................19
Adjustments................................................................................................................................................................................................................19
ELECTRICAL CONNECTIONS.......................................................................................................................................................................... 20
WCHE019 only .....................................................................................................................................................................................................................20
WCHE049, WCHE069, WCHE149 ........................................................................................................................................................................................21
START-UP......................................................................................................................................................................................................... 21
TEMPERATURE CONTROL.............................................................................................................................................................................. 21
PRELIMINARY CHECKS AFTER STARTING THE UNIT................................................................................................................................... 21
TURNING OFF THE UNIT ................................................................................................................................................................................ 21
MAINTENANCE................................................................................................................................................................................................ 22
PREVENTATIVE MAINTENANCE SCHEDULE.....................................................................................................................................................................22
Twice a year.................................................................................................................................................................................................................22
Annually ......................................................................................................................................................................................................................22
REPLACEMENT OF COMPONENTS...........................................................................................................................................................................22
HOW TO CLEAN THE UNIT.........................................................................................................................................................................................22
INACTIVITY ..................................................................................................................................................................................................................22
INFORMATION ON RESIDUAL HAZARDS AND EMERGENCY SITUATIONS.................................................................................................. 23
GENERAL SAFETY PROVISIONS ................................................................................................................................................................................23
HAZARDS ARISING FROM THE PRODUCT COMING INTO CONTACT WITH THINGS OR PERSONS................................................................................23
SAFETY STANDARDS FOR ELECTRICAL EQUIPMENT......................................................................................................................................................23
Introduction.................................................................................................................................................................................................................23
TASKS ASSIGNED TO OFFICERS-IN-CHARGE...................................................................................................................................................................23
HIGH VOLTAGE.....................................................................................................................................................................................................................23
SAFETY STANDARDS TO COMPLY WITH WHEN THE EQUIPMENT IS TURNED OFF.......................................................................................................24
SAFETY STANDARDS TO COMPLY WITH WHEN SERVICING LIVE EQUIPMENT ..............................................................................................................24
SAFETY STANDARDS TO COMPLY WITH WHEN SERVICING THE UNIT ...........................................................................................................................24
FIRE HAZARDS....................................................................................................................................................................................................................24
TOXIC SUBSTANCES ...........................................................................................................................................................................................................24
DANGERS ARISING FROM FLUIDS.....................................................................................................................................................................................24
DISASSEMBLING THE UNIT ........................................................................................................................................................................... 25
TROUBLE SHOOTING ...................................................................................................................................................................................... 26
Symptoms and Possible Causes: .......................................................................................................................................................................................26
Replacement Parts..............................................................................................................................................................................................................27
WARRANTY ...................................................................................................................................................................................................... 30
RETURN AND REPAIR POLICY ....................................................................................................................................................................... 30
LIMITATION OF LIABILITY ............................................................................................................................................................................... 31

© 2013 Pentair Equipment Protection
89087984 - 3 -
HOW TO CONSULT THIS MANUAL
This document contains general information applicable to all models. In the event of any information updates
becoming necessary, such updates shall be inserted in the enclosures.
THIS MANUAL IS INTENDED FOR THE FOLLOWING:
• Owner of the appliance
• Person responsible for its installation
• Person responsible for managing the product
• Person responsible for ordinary maintenance
• Person responsible for its disassembly
PURPOSE OF THE INFORMATION CONTAINED IN THIS MANUAL:
• CORRECT HANDLING: performed by unskilled personnel
• CORRECT INSTALLATION: performed by skilled personnel
• CORRECT MANAGEMENT: performed by skilled personnel
• CORRECT MAINTENANCE: performed by skilled personnel
• CORRECT ORDER FOR SPARE PARTS: CORRECT DISPOSAL OF THE PRODUCT: made by skilled personnel
RESTRICTIONS TO THE USE OF THIS MANUAL
They apply to any operations that must be performed by highly skilled personnel.
WHERE AND HOW TO STORE THIS MANUAL
Inside the electric cabinet or together with any other literature concerning the equipment which utilizes
the product, provided it is a dry and clean place.
In the event of the manual being misplaced or damaged, the customer may require, for a fee, a new
manual, by quoting the model and serial number shown on the technical name- plate, by contacting:
Pentair Equipment Protection
2100 Hoffman Way
Minneapolis MN 55303 USA
1-763-323-8200
CURRENT TECHNOLOGY
This manual reflects the state of the art existing at the time the product is marketed and shall not
be deemed to be inadequate for the sole reason that it has not been updated as a result of any new
experience.
UPDATES
Pentair Equipment Protection reserves the right to update the product and relevant manual without being
required to update previous products and manuals other than in exceptional circumstances. To require or
receive any updates of the instructions manual or amendments thereto, which shall be deemed to be an
integral part of the manual, please contact Pentair Equipment Protection.
Any suggestions or recommendations made by installers or users of the product for the purpose of
improving the product or the contents of this manual, will be greatly appreciated by the Manufacturer.
IN THE EVENT OF SALE OF THE PRODUCT
Please advise Pentair Equipment Protection of the address of the new owner so as to enable the dispatch
of any updates to the manual, otherwise Pentair Equipment Protection shall be relieved of any subsequent
liabilities.

© 2013 Pentair Equipment Protection 89087984
- 4 -
UNPACKING AND INSPECTION
Hoffman®cooling branded products are shipped ex-works. All units have been individually inspected and carefully
packaged.
Immediately inspect the unit upon receipt, making sure it has been shipped in its proper position. Note improper
shipment on the shipping document. We recommend accepting merchandise subject to inspection.
Check for damage and, if any, note this immediately on the shipping document.
Remove packing and check that the exterior casing is not scratched, marked or have signs of blows and that no
components are missing.
Before throwing the packaging away, check that it does not contain documents or additional parts of the unit.
Any damage that is encountered must be communicated to the carrier by registered letter within 8 days of receipt.
The carrier is responsible for any damage caused during shipment.
Pentair Equipment Protection is not responsible for damage caused to the merchandise by the shipper but will do
all in its power to assist customers in these situations.
INCLUDED IN THE CARTON:
• Heat Exchanger
• Mounting fastener kit
• Mounting gasket
• G-NPT Adapting Valves (2)
• User Manual
NOTE: This product may not be returned without prior written approval by Pentair Equipment
Protection.
NOTE: If installation of the product is not immediately required or the product needs to be
transported to its final destination, repackage it after your initial inspection, and store it in a
safe place.
UNIT IDENTIFICATION
This unit can be correctly identified by the technical nameplate containing all the information for its
correct use.
The technical name-plate is embossed on a plastic support which ensures high endurance of the text even
in particularly difficult environments.
Note: The serial number is required for any assistance or information concerning the unit
described in this manual.

© 2013 Pentair Equipment Protection
89087984 - 5 -
SAFETY REMARKS
Operation and maintenance of the heat exchangers can be dangerous if not carried out with the same care as
given to other appliances that have moving parts and electric components next to water.
Only skilled personnel may repair, inspect or maintain the heat exchangers.
Before servicing this unit, refer to the instructions contained in this manual, check the data on the name-plate
and follow any other precaution to ensure absolute safety.
Disconnect power before working on the unit.
WARNING
PRECAUTIONS WHEN HANDLING THE UNIT
Metal edges may be sharp. Be careful handling the unit, and always wear gloves.

© 2013 Pentair Equipment Protection 89087984
- 6 -
OPERATING PRINCIPLE
Hoffman cooling branded air-to-water heat exchangers are designed for cooling electric cabinets with
either a Type 12 or IP55 protection and are suitable for operating in industrial environments. These
models eliminate problems caused by high temperatures of the cabinet and prevent dirt and dust from
penetrating inside the electric board.
It is required that the water temperature be lower than the
cabinet temperature for the air-to-water heat exchanger to work
properly.
CAUTION
Cooling water, a constant flow of which must be furnished by the user at a temperature that is lower than the
temperature in the cabinet, passes through the tubes in a heat exchanger with copper tubes and aluminum fins
and back into the cabinet.
Heat is transferred through the walls of the copper tubes, exchanging heat from the fins to the cold water so that
the air exits cooler and the water hotter.
Note: The greater the difference between these two temperatures the more heat is
exchanged.
Temperature trend
0
10
20
30
40
50
60
tim e
°C
internal temp.
w ater temp.
∆t
AMBIENT
CABINET
WATER

© 2013 Pentair Equipment Protection
89087984 - 7 -
COOLING CAPACITY
This depends on the specific exchange factor of the heat exchanger (indicated on the label) and the
temperature difference between the interior of the cabinet and the cooling water.
FOR EXAMPLE:
Model: WCHE04916
Capacity noted on label: 2200W @ 25 C ∆T
Specific heat transmission: 2200 / 25 = 88W/°C
Application:
Maximum internal cabinet temperature desired: 40 C
Maximum estimated water temperature: 20 C
∆T Difference: 20 C
Cooling capacity: 88 x 20 = 1760W
PERFORMANCE DATA WCHE019 SERIES
Parameter Units WCHE01916002 WCHE01926002
Voltage / Phase / Frequency V/ph/Hz 115/1/50-60 230/1/50-60
Cooling capacity L35W10 (25°C dT) W870
Power absorbed W28
Current absorbed A0.5
Max airflow through heat exchanger CFM (m3/h) 118 (200)
Recommended water flow gpm (l/h) 0.66 (150)
Pressure drop at recommended water
flow psi (kPa) 0.3 (2)
Max water pressure psi (kPa) 73 (500)
Water connections (using valves) NPT 3/8 inch
Operating temperature Min/Max °F (°C) 50/122 (10/50)
Noise level (measured at 1m) dB(A) 58
Duty cycle %100
Protective system side cabinet Type 12 / IP55
Protective system side ambient IP55
Weight lb (kg) 20 (9)
Electrical connection 6 foot (1.8m) cord with
NEMA 5-15P 6 foot (1.8m) cord with NEMA 6-15P

© 2013 Pentair Equipment Protection 89087984
- 8 -
DESIGN DATA WCHE019 SERIES
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© 2013 Pentair Equipment Protection
89087984 - 9 -
PERFORMANCE DATA WCHE049 SERIES
Parameter Units WCHE04916002 WCHE04926002
Voltage / Phase / Frequency V/ph/Hz 115/1/50-60 230/1/50-60
Cooling capacity L35W10 (25°C dT) W2200
Power absorbed W90
Current absorbed A0.8
Max airflow through heat exchanger CFM (m3/h) 247 (420)
Recommended water flow gpm (l/h) 0.66 (150)
Pressure drop at recommended water
flow psi (kPa) 4.4 (30)
Max water pressure psi (kPa) 145 (1000)
Water connections (using valves) NPT 1/2 inch
Operating temperature Min/Max °F (°C) 50/122 (10/50)
Noise level (measured at 1m) dB(A) 58
Protective system side cabinet Type 12 / IP55
Protective system side ambient IP55
Duty cycle %100
Weight lb (kg) 44 (20)
Electrical connection 6 foot (1.8m) cord with
NEMA 5-15P 6 foot (1.8m) cord with NEMA 6-15P

© 2013 Pentair Equipment Protection 89087984
- 10 -
DESIGN DATA WCHE049 SERIES
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© 2013 Pentair Equipment Protection
89087984 - 11 -
PERFORMANCE DATA WCHE069 SERIES
Parameter Units WCHE06916002 WCHE06926002
Voltage / Phase / Frequency V/ph/Hz 115/1/50-60 230/1/50-60
Cooling capacity L35W10 (25°C dT) W3100
Power absorbed W115
Current absorbed A 1
Max airflow through heat exchanger CFM
(m3/h) 265 (450)
Recommended water flow gpm (l/h) 2.2 (500)
Pressure drop at recommended water flow psi (kPa) 9.1 (63)
Max water pressure psi (kPa) 145 (1000)
Water connections (using valves) NPT 1/2 inch
Operating temperature Min/Max °F (°C) 50/122 (10/50)
Noise level (measured at 1m) dB(A) 58
Protective system side cabinet Type 12 / IP55
Protective system side ambient IP55
Duty cycle %100
Weight lb (kg) 46 (21)
Electrical connection 6 foot (1.8m) cord with
NEMA 5-15P 6 foot (1.8m) cord with NEMA 6-15P

© 2013 Pentair Equipment Protection 89087984
- 12 -
DESIGN DATA WCHE069 SERIES
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© 2013 Pentair Equipment Protection
89087984 - 13 -
PERFORMANCE DATA WCHE149 SERIES
Parameter Units WCHE14916002 WCHE14926002
Voltage / Phase / Frequency V/ph/Hz 115/1/50-60 230/1/50-60
Cooling capacity L35W10 (25°C dT) W6700
Power absorbed W200 245
Current absorbed A 2 1.3
Max airflow through heat exchanger CFM (m3/h) 500 (850)
Recommended water flow gpm (l/h) 3.8 (860)
Pressure drop at recommended water flow psi (kPa) 5.8 (40)
Max water pressure psi (kPa) 145 (1000)
Water connections (using valves) NPT 1/2 inch
Operating temperature Min/Max °F (°C) 50/122 (10/50)
Noise level (measured at 1m) dB(A) 58
Protective system side cabinet Type 12 / IP55
Protective system side ambient IP55
Duty cycle %100
Weight lb (kg) 86 (39)
Electrical connection 6 foot (1.8m) cord with
NEMA 5-15P 6 foot (1.8m) cord with NEMA 6-15P

© 2013 Pentair Equipment Protection 89087984
- 14 -
DESIGN DATA WCHE149 SERIES
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89090294

© 2013 Pentair Equipment Protection
89087984 - 15 -
INSTALLATION INSTRUCTIONS
Before installing, check the following:
• The cabinet is Type 12 or IP55 type, depending on the overall rating required
• There is enough room for an easy application and installation, both inside and outside the cabinet
• The cabinet is clean on the inside
• The cabinet is not in the vicinity of heat sources or warm air flows
• The inside of the cabinet allows a proper air circulation, preventing any recirculation
• There is enough clearance to remove the outer cover and access the components.
For wall-mount applications, the following safety instructions must be complied with:
• The heat exchanger must be installed as high as possible
• If it is installed on a door, make sure that the hinges are strong enough to support the unit
• Make sure that the electric cable does not get torn or damaged with the door closed
• If the depth of the heat exchanger blocks the entire door opening clearance, provide a door stop for it
• Cabinet panel must be flat and rigid to form a tight seal with the mounting gasket.
INSTALLATION
NOTE: Prior to drilling holes or making cuts on the cabinet, make sure that holes, screws,
cables, etc. do not interfere with the equipment which has already been installed.
1. Identify the proper cutout drawing for the model being installed. Paper templates (included with
the unit) are marked with EXW## designations. The cross reference below indicates the template
for each model. Cutout drawings are also shown in this manual.
Model Template Marking
WCHE019 EXW06
WCHE049 EXW15
WCHE069 EXW25
WCHE149 EXW50
2. Make cuts on the cabinet panels by following the relevant template. Remove any chips, burrs or
sharp edges.
3. Attach the adhesive gasket (included) to the mounting surface of the heat exchanger as shown.
4. Place the heat exchanger against the cabinet and secure it with the appropriate screws (included).
Verify cabinet panel forms a tight seal with the mounting gasket.
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WCHE019 ONLY ALL OTHER MODELS
89086208
89087063

© 2013 Pentair Equipment Protection 89087984
- 16 -
WATER CONNECTIONS
1. Make plumbing connections using the on/off valves included. The connections on the unit are ‘G’
thread. ‘G’ to NPT adapting valves are included. Do not connect NPT fittings directly to the heat
exchanger, as the threads are not compatible and the connection will leak.
Note: Once unit is connected to water, PROTECT THE UNIT FROM FREEZING. Even after it is
disconnected, the heat exchanger will hold water and could be severely damaged by freezing
temperatures.
2. Make sure the pressure in the plumbing circuit does not exceed admissible values.
3. Introduce water into the circuit, making sure there are no leaks from pipelines.
4. Install an inlet and an outlet pressure gauge on the plumbing circuit plus a gate valve.
5. This will permit you to control the speed of the water inside the heat exchange coil and avoid
dangerous corrosion of the copper piping.
6. This is done by adjusting the gate valve so that the pressure gauges show a pressure difference
that is approximately equal to the stated load losses.
Note: If the unit contains a solenoid valve, it will allow flow of water only when the unit is
powered and calling for cooling.
For example: WCHE06916 stated pressure drop: 9.1 psi. The difference between inlet-
pressure value and out-pressure value ~9 psi.
7. For correct use of the heat exchanger and to avoid corrosion, the water used for the heat
exchanger must have hydrological values as listed:

© 2013 Pentair Equipment Protection
89087984 - 17 -
Chemical parameters of the circuit water
Characteristic Parameter
Langelier index -0.2 < L < +0.4
Chloride ions [Cl-] < 10 mg/l (ppm)
Sulfate ions [SO4 2-] < 30 mg/l (ppm)
Nitrates and nitrites[NO3-] < 30 mg/l (ppm)
Iron < 0.5 mg/l (ppm)
Cooper < 0.5 mg/l (ppm)
Resistivity 2000 < R < 5000 Ohm cm
pH value 6.9 < pH < 8
Alkalinity [HCO] < 300 mg/l (ppm)
[Ca2+ , Mg2+] / [HCO3-] > 0.5
Oxygen 4 < [O2] < 9 mg/l (ppm)
[CO2] < 30 mg/l (ppm)
Failure to comply with these instructions, in addition to
compromising proper machine operation, causes cancellation of
guarantee coverage.
CAUTION

© 2013 Pentair Equipment Protection 89087984
- 18 -
MECHANICAL PARTS
STRUCTURE
Made with self-supporting sheet metal panels, passivated and with primer coat to ensure good resistance
to corrosion, easily inspected and at the same time giving suitable protection to internal components.
Components inside the structure are only accessible by removing the front cover. This is done by
removing screws using appropriate tools.
HEAT EXCHANGE BANK
This is where heat exchange takes place between cabinet air and cooling water. It is composed of copper
pipes with aluminum fins.
CONDENSATE COLLECTION BASIN
This is built into the unit’s frame and is made of galvanized sheet or stainless steel. It comes standard with
a condensate drain pipe that exits from the heat exchanger.
ambient
cabinet
FLOW CONTROL SOLENOID VALVE
This is a normally-closed two-way type (ON/OFF).
Controlled by an internal thermostat, this valve opens the flow of water when the preset temperature is
reached. It stops the flow when cooling is no longer needed, or when power is disconnected from the unit.

© 2013 Pentair Equipment Protection
89087984 - 19 -
MOTORS
FANS
Fans run full speed to constantly circulate enclosure air, they are not controlled by the thermostat.
These may be of different types depending on the model. They are either:
- multi-blade axial, with outside rotor on bearings, dynamically balanced.
- compact axial, on bearings
- radial, with plastic or metal rotor, on bearings
These fans are manufactured in accordance with Standard EN 60 335 1. They are treated with rust-
inhibiting plastic materials, with class B insulation and class 1 protection.
The motor protection is IP44, in accordance with Standard DIN40500 whereas the safety degree complies
with Standards DIN30110.
Noise levels are consistent with Standard DIN 45635.
CONTROL, MONITORING AND SAFETY COMPONENTS
REGULATING THERMOSTAT FOR SOLENOID VALVE
This is a gas-loaded mechanical thermostat. It measures the air temperature entering the heat
exchanger, and upon reaching the setpoint, activates the solenoid valve to open the flow of cooling water.
In some models the mechanical thermostat may be replaced with an electronic thermostat, whose
specifications are outlined in the supplements to the manual.
ADJUSTMENTS
To adjust the thermostat setting, first interrupt power to the unit. Remove the heat exchanger’s
front cover to access the thermostat.
The thermostat is set at 35 C (95 F) at the factory. It can be adjusted using a screwdriver to turn
its pin. The thermostat can be set to temperatures from 20 C to 46 C (68 F to 115 F). Contact our
service department for temperatures other than those in the pre-set range.
Note: The thermostat has a 4 C (7 F) hysteresis, therefore the solenoid valve will open at a
temperature 4 C (7 F) greater than the set temperature.
Temperature Conversion
°C °F
20 68
25 77
30 86
35 95
40 104
45 113
After making the adjustment, replace the front cover and resupply voltage.

© 2013 Pentair Equipment Protection 89087984
- 20 -
ELECTRICAL CONNECTIONS
Check supply voltage before making any connections. Supply
voltage must be as specified on the unit’s nameplate.
WARNING
Connect the power cord to a properly grounded power source. Use of an extension cord is not recommended.
Electrical connections must be made according to local applicable codes and standards.
An automatic circuit breaker with a capacity as indicated on the
unit’s nameplate must be installed.
WARNING
WCHE019 ONLY
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