Cambridge Air Solutions E Series User manual

E-TM1-0220
E-SERIES
Evaporative Cooling
TECHNICAL MANUAL
WARNING:
Improper installation, adjustment, alteration, service or maintenance can
cause property damage, injury or death. Read the installation, operating, and
maintenance instructions thoroughly before installing or servicing this equipment.
Made in the USA

LIMITED WARRANTY
Cambridge Air Solutions Limited Warranty is included with the Terms and Conditions that are sent with
every Order Acknowledgement. For questions regarding the Limited Warranty, contact Cambridge Air
Solutions Customer Service Group at 1-800-473-4569 during the hours of 8:00 a.m. to 5:00 p.m. Central
Time, Monday through Friday.

Copyright © 2020
Cambridge Air Solutions
All Rights Reserved
CONTENTS
SAFETY CONSIDERATIONS ..................................................................................................4
OVERVIEW OF MANUAL.......................................................................................................5
RECEIVING, OFFLOADING, AND RIGGING INSTRUCTIONS.........................................5
Receiving Checklist..............................................................................................................5
Resolving Shipping Damage ................................................................................................6
Forklifting Considerations ...................................................................................................6
Preparing the Unit Site .........................................................................................................6
Offloading and Rigging Instructions...................................................................................6
General Lifting Considerations............................................................................................7
Unit Placement and Assembly..............................................................................................7
SECTION TO SECTION ASSEMBLY ......................................................................................7
Assembly Hardware .............................................................................................................8
INSTALLATION ─ MECHANICAL ........................................................................................8
INTERNAL ASSEMBLY ..........................................................................................................8
EXTERNAL CONNECTIONS ..................................................................................................8
Duct Connections.................................................................................................................8
Fan Discharge Connections..................................................................................................8
FILL AND DRAIN VALVE SCHEMATIC ..............................................................................9
Condensate Drain Connections.......................................................................................... 10
Electrical Connections ....................................................................................................... 10
START-UP ................................................................................................................................ 10
Media Cooling Pads Operating Installation....................................................................... 11
Start-Up Checklist.............................................................................................................. 11
MAINTENANCE.....................................................................................................................12
TROUBLESHOOTING............................................................................................................ 14
SERVICES AVAILABLE ......................................................................................................... 14
ORDER NOTES ....................................................................................................................... 14
CAMBRIDGE ENGINEERING PARTS LIST (COMMON PARTS)..................................... 15
Cambridge Air Solutions
760 Long Road Crossing Dr.
Chesterfield, MO. 63005
Phone: [phone]
Fax: [phone]
www.cambridgeair.com
E-SERIES
Evaporative Cooling
TECHNICAL MANUAL
NEED UPDATED
TABLE OF
CONTENTS

Cambridge Air Solutions. 4 E-Series Technical Manual
GENERAL INFORMATION:
Cambridge Air System’s E-Series Direct Evaporative
Coolers are custom fabricated air handlers.
They use evaporative cooling to meet specific usage and
dimensional requirements. Use this manual to install,
start-up, operate and maintain the E-Series models.
A careful review of this manual will help minimize
installation, start-up, and maintenance difficulties.
Operating Environment
The unit is designed for outdoor applications. When
considering the placement of the E-Series, it is important
to consider the operating environment. The acceptable
temperature range for unit operation is -10°F to 115°F.
CAUTION:
Do not subject the unit to temperatures above
140°F / 60°C..
NOTE: Careful consideration is also required if the
unit will be installed within a coastal temperate zone.
Additional protective coatings may be necessary to
prevent corrosion.
SAFETY CONSIDERATIONS:
Throughout this manual are Warnings, Cautions and
Notes to alert the installing contractors, service and
maintenance personnel of potential hazards that could
result in personal injury, death or serious damage to
property or equipment.
Your personal safety and the proper operation of this
machinery depend on the careful observance of all
Warnings, Cautions and Notes:
WARNING:
Indicates a potentially hazardous situation which, if
not avoided, could result in death or serious injury.
CAUTION:
Indicates a potentially hazardous situation which,
if not avoided, could result in minor or moderate
injury, or to alert against unsafe practices.
NOTE: Indicates a situation that could result in
equipment or property damage, or provides important
information on installation considerations.
WARNING:
Proper Field Wiring and Grounding Required!
All field wiring MUST be performed by qualified
personnel. Ensure all field wiring and grounding
is accomplished in full accordance with National
Electrical Code (NEC) and local/state electrical
codes. Failure to do so may pose FIRE or
ELECTROCUTION hazards resulting in death or
serious injury.
WARNING:
Personal Protective Equipment (PPE) Required!
Installing/servicing this unit could result in
exposure to electrical, mechanical and chemical
hazards.
• Before installing/servicing this unit, technicians
MUST wear all recommended Personal Protective
Equipment (PPE) for the specific work being
undertaken.
ALWAYS refer to appropriate Safety Data Sheets
(SDS) sheets and OSHA guidelines for proper
PPE.
• When working with or around hazardous
chemicals, ALWAYS review appropriate SDS
and OSHA guidelines to ensure compliance with
safety standards for personal exposure levels,
proper respiratory protection and handling
recommendations.
• If there is a risk of arc or flash, technicians MUST
put on all PPE in accordance with the National
Electrical Code (NEC) for arc flash protection,
PRIOR to servicing the unit.
• Failure to follow recommendations could result in
death or serious injury.
E-SERIES DIRECT EVAPORATIVE COOLING (DEC)

E-Series Technical Manual 5 Cambridge Air Solutions
RECEIVING:
Upon receipt, examine units carefully for in-transit
damage or missing components as detailed in packing
list. If damaged, report damage(s) to trucking company,
take pictures, and contact Cambridge Air Solutions.
After uncrating unit, verify that it is the proper size and
that all loose parts are included.
NOTE: Inspect the exterior and interior of the equipment
carefully for any damage that may have occurred during
shipment. Verify shipped loose parts are complete and
undamaged. Ensure there is no damage to protruding
exterior components such as door handles, disconnect
switch handle, etc. or to internal components such as
pumps, media, filters, louvers and drains.
INSTALLATION:
WARNING:
Do not remove unit from shipping skid until it
is at the installation location. Moving these units
when not properly secured to the skid can result in
personal injury or death and can seriously damage
the unit.
WARNING:
To prevent injury or death, and damage to unit,
ensure the lifting capacity of the moving equipment
exceeds the weight of the unit by an adequate
safety margin.
NOTE: Ensure all local building and electrical codes are
fully complied with in installing the unit.
Take the following factors into consideration before
selecting the location of installation:
• Ensure sufficient clearance, per the submittal, to
allow easy access for maintenance and system
operation.
• Unit must be installed on a level foundation
that allows for proper flow of condensation into
internal drains, sufficient to support continuous
to full perimeter of base and cross members, and
minimize deflection of unit base frame to no more
than 1/16th “ (1.6mm) over the length and width of
unit.
WARNING:
To prevent injury or death, disconnect electrical
power source before completing connection to
the unit. All wiring must comply with National
Electrical Code (NEC) and state and local
requirements. Outside the United States, the
national and or local electrical requirements of
other countries shall apply.
The installing contractor must connect appropriate
power wiring to the terminal block or non-fused,
unit-mounted disconnect in the power section of
the unit control panel.
WARNING:
During installation, testing, servicing, and
troubleshooting of this product, it may be necessary
to work with live electrical components. To
prevent injury or death due to electrocution, take
extreme care when performing service procedures
with electrical power energized. Have a qualified
licensed electrician or other individual who has
been properly trained in handling live electrical
components perform these tasks. Failure to
follow all safety precautions when exposed to
live electrical components could result in death or
serious injury.
1. All installation should be performed in accordance to
local and state codes and with proper permits.
2. Measure the unit for correct sizes compared to the
submittal. Immediately contact Cambridge Air
Solutions if the unit’s openings do not match.
3. Check for proper air flow direction.
4. Set the unit in place. Make sure the unit covers the
entire air inlet opening.
5. Fasten the unit in place with the self-drilling screws
provided with the unit.
NOTE: Take care not to drill or screw into sump tank.
6. Check for air leakage. Air leakage will lower the
efficiency of the unit.
7. Check that the unit is level for proper water transfer
through the system.
8. Check that the sump pump has a good seal to the
floor.

Cambridge Air Solutions. 6 E-Series Technical Manual
Roof Top Configuration – E-Series
24" MOUNTING CURB
INLET DAMPER
RAINHOOD
W/ FILTERS
Fan Discharge Connections
To ensure the highest fan efficiency, duct turns and transitions must be made carefully, minimizing air friction losses
and turbulence. Proper ductwork installation, as outlined by such organizations as Sheet Metal and Air Conditioning
Contractors National Association, Inc. (SMACNA), should be followed closely.
PLUMBING / FILL AND DRAIN VALVES:
1. All installation should be performed in accordance to local and state codes and with proper permits.
2. The make-up water connection is ½” FPT.
3. Install a 3-way fill valve under the roof (in a conditioned space) to keep the pipe from freezing (see attached
schematic).
4. The 2-way drain valve can be installed outdoors or indoors under the roof line in a frost-free environment. See
schematic below. If the 2-way drain valve is installed outdoors (above the roof level), valve cover(s) are required.
Auto Drain with Freeze Protection (Optional)
Install a two-way drain valve on the sump’s drain connection. Install a three-way fill valve under the roof-line with
port “AB” piped to the make-up water connection from the sump. Port “A” is piped to the city water supply and port
“B” is piped to an approved roof drain. (See attached drawing.)
During normal operation of the unit the drain valve will be shut and the fill valve is open from port ”A” to port “AB”
letting city water enter the sump. Water level is adjusted and controlled by a float assembly to a level ½” inch below
the overflow. On a freeze signal or a signal from the 24-hour time clock, the drain valve will open allowing the sump
to drain. Simultaneously, the fill valve will shut off the city water, closing port ”A” to port “AB” but will open port
“AB” to port “B,” thus allowing the remaining water in the exposed pipe from the valve to the sump to drain to keep
the pipe from freezing. A low-water cut off switch will protect the pump(s) from running dry.
During installation, relocate the freeze stat bulb (located inside the electric control panel) to the outside of the
enclosure to ensure correct temperature readings.

E-Series Technical Manual 7 Cambridge Air Solutions
FILL VALVE SCHEMATIC:
NOTE: ALL PLUMBING, PIPING, AND FIXTURES EXTERNAL TO UNIT ARE TO BE
FURNISHED AND INSTALLED BY OTHERS UNLESS OTHERWISE INDICATED.
8
FILL VALVE SCHEMATIC :
NOTE: ALL PLUMBING, PIPING, AND FIXTURES EXTERNAL TO UNIT ARE TO BE FURNISHED AND
INSTALLED BY OTHERS UNLESS OTHERWISE INDICATED.

Cambridge Air Solutions. 8 E-Series Technical Manual
FILL AND DRAIN VALVE SCHEMATIC
Drain, Overflow and Make-Up Water Piping for Autodrain with Freeze Protection
NOTE: *Wiring may change ifpumps provided by others.
FILL & DRAIN KIT
24V CONTROL TB
FROM UNIT
(FIELD INSTALLED & WIRED)
FILL & DRAIN KIT WIRING SCHEMATIC
2 WAY VALVE*
3 WAY VALVE*
DRAIN OVERFLOW
1" DRAIN
WATER SUPPLY LINE
VIEW
Scale: None
A - A
Evap Pump
Bleed
Tube
Manifold
Supply
Tube
Service Valve
(by others)
Pressure Regulator
(by others) Three Way Drain
& Fill Valve
Water Supply (Refer to manual
pressure guide)
End B
End A
Roof Line
UNIT MUST BE LEVEL
A
A
Two Way Drain Valve
Normally Open
End A
End B
1" Drain
Drain Overflow
**All wiring must comply with local and national electrical codes.
NOTE: ForDual Inlet Units, separate connections
are required for each evaporative section.

E-Series Technical Manual 9 Cambridge Air Solutions
ELECTRIC PANEL / WIRING:
The pump and low level switches are wired to a J-Box in
the DEC module.
Wiring to the control panel is pre-wired and coiled up in
the Electrical Control Enclosure for termination in the
field.
Factory-supplied power and control wiring are to be
field-connected to the terminal strip located in the Jbox-
mounted on the DEC.
NOTE: Power is supplied and installed by others.
• All installations should be performed in accordance
to local and state codes and with proper permits.
• Wire the unit according to approved submittals and
the wiring diagram.

Cambridge Air Solutions. 10 E-Series Technical Manual
MEDIA COOLING PADS OPERATING INSTALLATION:
45
15
Do not expose CELdek®evaporative cooling pads to sparks, open flame, welding spatter, temperatures
in excess of 3500F, or other sources which may ignite the paper. GLASdek®will not readily ignite,
unless exposed to a direct flame or extremely high temperatures for an extended period of time.
Test Results for ASTM-E84 Standard Method of Test for Surface Burning Characteristics of Building Materials
PRODUCT Flame Spread Index Smoke Density
CELdek 450 420
GLASdek 0 20
Mi-T-Dark®,DRIFdek®, & COOLdek®15 745
IMPORTANT
Installation
In order to get the best performance from your Munters cooling pads, they must be installed properly. If you have
purchased a pad with two equal angles, they can be installed in either direction.
Depending on the application, pads are manufactured with special angle combinations. Those having combinations
of 150x 450or 300x 450are made to direct more water toward the
air entering side of the pads. If installed backwards, the pads may
not work properly.
Munters pads must always be installed with the steeper flute
angle sloping down toward the air entering side. The reasoning is
simple, the steeper angle puts more water on the entering side of
the pad where the air is hot, dry, and dusty and extra water it is
needed most. The unequal angles also counteract the tendency
of the air to push the water toward the air leaving side of the pad.
CELdek “New Pad” Odor
CELdek is made from materials similar to those used in paints,
carpets, paneling and wallpaper. CELdek pads must be flushed
with water to remove the new construction odors.
If you find the smell of the new paper to be objectionable, you
should run water over the pad for 2-5 hours without the fan
running. Change the water often, using bleed off or dump cycles.
If the odor continues after one or two days, call Munters
customer service. Please have full details of when and from
whom the pad was purchased.
Caution
The data and suggestions contained herein are based on information Munters believes to be reliable. They are offered in good faith but without guarantee, as conditions and methods of use are beyond our
control. We recommend that the prospective user determine the suitability of our media and suggestions before adopting them on a commercial scale.
For more information Contact Munters Corporation, HumiCool Division 239-936-1555
©Copyright Munters Corporation 2002 Printed in USA
Engineering Bulletin EB-OI-0906
MEDIA ORIENTATION
INSTRUCTIONS

E-Series Technical Manual 11 Cambridge Air Solutions
START-UP CHECKLIST
Once the air handler has been assembled, installed,
and piped, attention must be directed to individual
components for proper operation. Before operating the
unit, complete the Pre Start-up checklist. Sign and send
copy to Cambridge.
NOTE: Follow all Manufacturers’ Guides for Pre Start-
Up. The following is a guide only.
1. Remove any debris from the unit interior.
a. Remove all foreign material from the drain pan
and check drain pan opening and condensate line
for obstructions.
b. Ensure the unit has been installed level.
c. Ensure the damper operator motors and
connecting linkage has been installed.
d. Verify the damper operation and linkage
alignment.
e. Check that the air filters are in place and
positioned properly.
f. Close and secure all unit access doors
2. If differential pressure switch is provided on filter
rack, adjust per system requirements.
3. Inspect electrical connections to the unit and unit
controllers.
a. Connections should be clean and secure.
b. Compare the actual wiring with the unit
diagrams.
c. eference the appropriate controller manual for
more details about starting units with factory
mounted controls.
4. Ensure all piping, connections, vents and drains have
been connected properly
5. Ensure supply and return air ducts have been
connected properly.
6. Check piping and valves for leaks.
7. Fill sump tank with water and adjust float to ½”
below overflow drain.
8. Check that the fill and drain valve are installed and
wired to the 24-hour timer and freeze stat. Set the
24-hour fill and drain timer to local time. The drain
and refill feature is factory set to turn off the sump
for 1 hour between 4 am to 5 a.m., and is manually
adjustable to User’s requirements.
WARNING:
Whenever power is interrupted, the 24-hour clock
must be reset to local time.
9. Turn power to unit on and check for any electrical
shorts.
a. Measure and record the motor voltage and
amperage on all phases to ensure proper
operation. The readings should fall within the
range given on the motor nameplate.
b. Check fan rotation and correct if necessary.
c. Check all interlocks to be sure that connected
components work per plans and specifications.
10. Check that line and sump pump voltages and
amperages as per the nameplate.
11. Confirm the time delay has been set to 1 minute on
the sump pump(s).
12. Verify the low water level float switch located in
sump is working properly and will turn the pump(s)
on.
13. Start-up the fan per manufacturer's instructions. After
both the fan and sump are running and operating
properly, check that water is not being carried over
into the airstream from the media pads or sump.
14. Cycle damper actuators to ensure they open and close
freely.
If there is water carryover from the media pads
perform the following procedure:
15. Check for proper positioning of media pads on the
sides of the pads are arrows marking the direction of
air flow. If media pads are correctly positioned then
check for air bypassing between the media pads and
their frames. If air is bypassing, then place a strip
of foam gasketing between the media pads and side
channel to compress the media pads and fill the gap.
16. After twenty (20) minutes observe media for
complete wetting and check that there are no dry
streaks. Open balancing valve to increase water flow
and close valve as necessary to reduce water flow to
media pads. (Initial factory-set position of valve is ½
open).

Cambridge Air Solutions. 12 E-Series Technical Manual
17. After running the unit for (1) week adjust factory
pre-set bleed valve(s). This process allows the pump
to discharge the concentration of solids in the water.
The bleed valve is located on the discharge portion
of the pump and is connected to a 3/8" drain tube.
The drain tube should always be positioned inside the
overflow drain. Use the following procedure to set
bleed valve:
i. Completely turn the bleed valve(s) open.
This allows the pump to discharge the
concentration of solids in the water.
ii. Close the bleed valve(s) and count the
number of turns required.
iii. Set bleed valve(s) to ½ open position.
iv. Check that bleed lines(s) are connected
to overflow drain.
v. Increase water flow rate if there are scale
deposits on the media pads. Check for
water carryover afterwards and adjust if
necessary.
vi. If there are dry streaks in the media
then remove distribution header and any
debris blocking the distribution holes.
b. Open or close the valves to check for proper
operation.
c. Drain lines should be open.
18. Leave this manual with the unit.
Conductivity/Total Dissolved Solids (TDS)
Controller
Start up the controller per manufacturer’s Installation &
Operation Manual (IOM), based on the recommendations
of your local water quality expert to ensure proper water
quality in the evaporative cooling units.
BELT TENSION:
Proper belt tension is important for long belt life. Too
much tension will place excessive loads on the belts and
bearing, causing premature failure. Not enough tension
will cause belts to slip generating dust and heat while
reducing the belt life. Use a belt tension tool to check the
belt’s tension. Ideal belt tension is the lowest tension at
which the belts will not slip under peak load conditions.
Before starting the fan, recheck the alignment and realign
the sheaves if necessary. New belts may stretch after
installation, so recheck belt tension frequently during the
first 24-48 hours of operation. Make drive inspections
on a periodic basis. Never apply belt dressing.
Correct
Incorrect Incorrect
Incorrect
NORMAL OPERATIONS:
Sequence of Operation:
1. Upon external signal the sump pump will energize
and water will flow to the distribution header and
over the media pads.
NOTE: For longer media pad life do not cycle the
water flow over the media pads. The pump should run
continuously (Variable air volume or cycling the fan are
acceptable methods of temperature control).
If the pump has to be cycled, a wash down cycle
component can be purchased to prevent the plating of
solids on the media.
2. At the factory pre-set or customer-set time, the fill
valve will close and the drain valve will open for one
hour emptying the sump.
NOTE: This procedure is necessary to prevent algae and
scale formation on the media pads.

E-Series Technical Manual 13 Cambridge Air Solutions
MAINTENANCE:
Frequency of Maintenance
Spring Start-Up
1. Clean any scale or debris in the sump tank and sump
pump.
2. Remove the distribution header and clean out the
distribution holes that supply water flow to media
pads. Inspect all wire connections for discolored and/
or burned wires. Replace where necessary.
3. Check unit for proper grounding.
4. Inspect media pads and replace per manufacturer’s
recommendations.
5. Inspect and lubricate bearings. Use correct and
adequate lubrication. Keep grease lines, connectors
and lubrication tools clean and free of contamination.
6. Inspect and clean fan housing and impeller (no high
pressure cleaners are to be used).
7. Check and adjust the following items:
a. Open make-up water valve allowing sump to fill
with water and check for leaks.
b. Check float for operation and adjust to maintain
water level at 3-1/4" depth.
c. Check the sump water level is ½” below the
overflow level and the low water level switch is
closed.
d. Clean any debris around the overflow intake.
e. Fully close bleed valve then fully open it
counting the revolutions. Set to 50% open.
f. Check after the first month of operation and
adjust if necessary to prevent solids from
forming on the exchanger.
g. Inspect media pads and replace per
manufacturer’s recommendations.
1) Inspect at bottom of heat exchanger for
complete water coverage. Should see a
steady flow of water across the complete
exchanger
8. Follow ‘Initial Start Up’ procedures.
Monthly and Quarterly Maintenance
1. Inspect sump pump and water level. Adjust float
valve if necessary.
2. Check media pads for scaling and adjust bleed valve
as required.
3. Inspect for water carryover and leaks.
4. Inspect air flow making sure no outside air is
bypassing media pads.
5. Check the belts and sheaves. Align as needed.
Always replace all the drive belts, even if only one
belt is worn. Replace the sheave if the grooves show
signs of wear.
6. Verify the proper belt tension and drive alignment.
7. Clean the housing and wheel.
8. Check all bolts, nuts and set-screws are tightened.
Annual Shutdown for Winterizing
1. Disconnect the power supply.
2. Shut off manual water make-up valve to unit.
3. Drain sump. Pump removal is not necessary.
4. Clean any scale or debris in sump and sump pump
area.

Cambridge Air Solutions. 14 E-Series Technical Manual
REFERENCES
Munters Engineering Bulletins (Available on the Cambridge Air Solutions web site)
• EB-CPR-0311 When do cooling pads need to be replaced?
• EB-IMT-100-0501 Inspection & maintenance for T-100 horizontal flow mist eliminator
• EB-OPI-0205 Media operating instructions
• EB-PMC-0305 Cooling pad checklist
• EB-WTM-0408 Water treatment advice for industrial applications with CELdek and GLASdek equipped
evaporative coolers
• MB-ACC-205 Common algae treatment chemicals
SCAN THIS CODE TO ACCESS OUR
“HOW-TO” SERVICE VIDEOS ONLINE.
https://www.cambridgeair.com/parts-service/how-to-service-videos

E-Series Technical Manual 15 Cambridge Air Solutions
MODEL NO. SERIAL NO.

Cambridge Air Solutions reserves the right to change specifications, modify the design and/or substitute
equivalent materials without notice as the result of code requirements, product enhancements, ongoing
research/development and vendor changes beyond our control.
760 Long Road Crossing Dr., Chesterfield, MO 63005
Phone: [phone] [phone], Fax: [phone]
www.cambridgeair.com