Sterling EV User Manual

IIEVC-6

J30-05401

INSTALLATION SERVICE MANUAL

OUTDOOR ROOFTOP EVAPORATIVE COOLING UNITS

*Unit Type (EV) - Capacity (CA) - (10-40)

Evaporative Cooling systems meet a wide range of heating and ventilating requirements. The Evaporative Cooler
may be purchased as an individual unit in four sizes from 800 CFM to 8500 CFM (0.4 to 4.0 m3/s) or, it can be
combined with Rooftop Packaged Units (Natural or Power Vented), Air Handlers, or Make-up Air Handlers. In any
combination, the Evaporative Cooler will replace the need for 100% Outside Air Inlet Hood.

Evaporative Cooling is the simplest and most-cost effective cooling method without the use of mechanical
refrigeration.

FPO

ATTENTION: Read This manual IIEVC, manuals RISM* and RBM*, submittal/data sheets,
and all labels attached to the unit carefully before attempting to install, operate, or ser­vice the Evaporative Cooling Unit! Retain this manual for future reference.

Maintain water in sumps by proper microbicidal water treatment to mini­mize the risks of illness caused by Legionella Pneumophila (the bacteria that causes
Legionnaire's Disease) and other bacteria. Refer to local codes regar ding any additional
treatment or restrictions regarding water supplies and usage.

INSTALLER'S RESPONSIBILITY

Installer Please Note: This equipment has been tested and inspected. It has been shipped

free from defects from our f actory . Ho wever , during shipment and installation, problems such as
loose wires, leaks or loose fasteners ma y occur . It is the installer's responsibility to inspect

and correct any problems that may be found.

The model and serial numbers are located on the data plate attached to the side of the cooler.
Record this information in the spaces provided below.

Model No. Serial No.

*This manual may also be used for the following:
Unit Types (UT) - (RT or PV)
Rooftop Arrangements (RA) - (D or E) and
Unit Type (UT) - (AH)
Rooftop Arrangements (RA) - (P or R)
Capacity (CA) - (20 or 40)

260 NORTH ELM ST., WESTFIELD, MA 01085

TEL: [phone] FAX: [phone]

www.mestek.com

RECEIVING INSTRUCTIONS

Inspect shipment immediately after receiving to determine
if any damage has occurred during shipment If any
damage is found, the consignee should sign the bill of
lading, indicating such damage, and immediately fi le claim
for damage with the transportation company.

TABLE OF CONTENTS

Description Page

General Information ...........................................Cover, 2

PERFORMANCE & SPECIFICATION DATA
Evaporative Cooler - Dimensional

& Performance Data .............................................. 3

CELdek® Media Data and Effi ciency Chart .............3

Gas-Fired Rooftop Packaged Units

with Evaporative Cooler .................................... 4, 5

Air Handler with Evaporative Cooler ......................... 6

PARTS IDENTIFICATION ............................................ 7

INSTALLATION

Mounting to Roof ...................................................... 8

Connecting Water Supply ......................................... 8

Faucet Use ............................................................... 8

Adjusting Water Level and Float Valve ..................... 9

Adjusting Water Flow ................................................ 9

Bleed-Off .................................................................. 9

Electrical Connections ...................................... 10, 11

MAINTENANCE

Maintenance Schedule ........................................... 12

Changing Media ................................................12, 13

Cleaning Water Pump .............................................13

Washing Media ........................................................13

Washing Inlet Filter ..................................................13

Cabinet Cleaning and Touch-up ..............................13

Winter Shut-Down ...................................................13

Evaporative Cooler Curb Assembly Diagram ..........14

Model Number Description ......................................15

Replacement Parts ..................................................15

The following terms are used throughout this manual, in
addition to the other requirements, to bring attention to the
presence of potential hazards or to important information
concerning the product:

Indicates an imminently hazardous
situation which, if not avoided, will result in
death, serious injury or substantial property
damage.

Indicates an imminently hazardous
situation which, if not avoided, could result in
death, serious injury or substantial property
damage.

Indicates an imminently hazardous
situation which, if not av oided, ma y result in minor
injury or property damage.

NOTICE: Used to notify of special instructions on
installation, operation, or maintenance which are
important to equipment but not related to personal
injury.

Failure to comply with the General Safety Information
may result in extensive property damage, severe
personal injury, or death.

GENERAL SAFETY INFORMATION

Unless otherwise specifi ed, the following conv ersions may
be used for calculating SI/metric unit measurements:
1 lb. = 0.453 kg
1 cubic foot = 0.028m

3

1000 Btu per hour = 0.293 kW
1 foot = 0.305 m
1 inch water column = 0.249 kPa
1 inch = 25.4 mm
1 gallon = 3.785 L
1 psig = 6.894 kPa
1000 BTU/cu. ft. = 37.5 MJ/m

3

1liter/second = CFM x 0.472
meter/second = FPM ÷ 196.8

– 2 –

Disconnect all power before
installing or servicing the unit. If power disconnect
is out of sight, lock it in the open position and ta g
it to prevent unexpected application of power.
Failure to do so could result in fatal electrical
shock or severe personal injury.

Do not alter the unit in any way, or
damage to the unit and/or severe personal injury
or death may occur.

Do not depend on a thermostat or
other switch as a sole means of disconnecting
power when installing or servicing unit. Always
disconnect power at the main circuit breaker as
described above. Failure to do so could result in
fatal electrical shock.

4"

(102)

8" CELdek®
(Optional 12")

2" CELdek®

Overflow

Pump

Ball
Valve

1/4" Water
Inlet

Float Valve

Bleed-off

Water
Distribution
Assembly

“A”

Intake
Filter

S

S

SECTION S-S

3/4" NPT

Drain

(Capped)

Junction Box

Liquid Tight
Electrical
Tubing

43"

(1092)

36"

(914)

Figure 1

200

0.5

100%

90%

80%

70%

60%

0.4

0.3

0.2

0.1

Air Velocity - FPM

Evaporative Cooling Efficiency

Air Pressure Drop Inches - WG

300 400 500 600 700 800

12"

8"

8"

12"

Evaporative Cooling Efficiency

Air Pressure Drop

PERFORMANCE AND SPECIFICATION DATA

Evaporative Cooling Units

Capacity

10/15

20/25/50

30/35
60/70

40/80

A

32-7/8"

(835)

43-7/8"

(1114)

54-7/8"

(1394)

60-3/8"

(1534)

Table 1 (Refer to individual unit submittals for more specifi cations.)

Performance and Dimensional Data

8" Saturation 12" Saturation 8" or 12" Media Pressure Drop “A” Unit Shipping Operating
CFM Effi ciency Effi ciency Face Area Size in W.C. Width Wt. Wt.
(cu. m/s) (cu. m/s) Range Range Ft.
*Capacity MIN. MAX. MIN. MAX. MIN. MAX. (m

10,15 800 4,500 78 88 89 92 7.01 31 x 32-9/16 0.03 0.23 32-3/4 137 301
(0.378) (2.124) (0.65) (787 x 827) (0.01) (0.06) (832) (62) (136)
20, 25, 50 1,600 5,500 77 88 88 92 9.38 31 x 43-9/16 0.03 0.20 43-3/4 166 386
(0.755) (2.596) (0.87) (787 x 1106) (0.01) (0.05) (1111) (75) (175)
30, 35, 60, 70 2,400 8,500 77 86 88 92 11.75 31 x 54-9/16 0.05 0.30 54-3/4 192 468
(1.133) (4.012) (1.09) (787 x 1386) (0.01) (0.07) (1391) (87) (212))
40, 80 3,200 8,500 77 86 87 92 12.92 31 x 60 0.07 0.28 60-1/4 206 509
(1.510) (4.012) (1.20) (787 x 1524) (0.02) (0.07) (1530) (93) (231)
*Capacities - (50, 60, 70 and 80) are for Dual Furnace Unit Types only.

2

in. (kPa) (kPa) in. lb. lb.

2

) (mm) MIN. MAX. (mm) (kg) (kg)

CELdek® EVAPORATIVE MEDIA

The Evaporative Cooler utilizes high effi ciency
CELdek® media. CELdek® is made from a special
cellulose paper, impregnated with insoluble anti­rot salts and rigidifying saturants. The cross fl uted
design of the pads induces highly-turbulent mixing
of air and water for optimum heat and moisture
transfer. The evaporative coolers are available
with standard 8 or optional 12 inch media which
produce high effi ciency and high face velocities,
along with a 2" distribution pad to disperse the
water evenly over the pads.

Figure 2

– 3 –

Rooftop Packaged Unit

D4163
T4160BD

B

Discharge

Opening

1-5/16" (33) Typ.
Anchor Hole
Location

5"

(127)

A

C (Typ. Sq.)

*

F

D

39"

(991)

G

Outside

1" (25)

Curb Cap

5/8" (16) Typ.
Anchor Hole
Location

6-1/16"

(154)

8-3/4
(222)

26"

(660)

Electrical
Connections

Vent Caps
Are Shipped
In Separate
Cartons

Gas
Connection

§

L

Evaporative
Cooler

18-7/8" (479)

x J Typ.

O.S. Damper

Opening

6-1/2"

(165)

36"

(914)

C

L

1-1/8" (29)

Typ. Duct

Flange

1" (25)

Typ.

19"

(483)

Discharge

Opening

10-1/8"

(257)

§

U (Capacities 10/40)

§

U (Capacities 50/80)

36"

(914)

with Evaporative Cooling

Figure 3 - Natural Vent Rooftop Unit with Evaporative Cooler (without Supply Plenum)

Table 2A

A.G.A. C.G.A. GAS INLET
CAPACITY A B C D D *F G ▲J L §U NAT LP

10 32-7/8 15-9/16 12 11 20-11/16 19-3/8 31-1/16 24 77-3/8 72-1/4 1/2 1/2
(835) (395) (305) (279) (525) (492) (789) (610) (1965) (1835)
15 32-7/8 18-5/16 21-1/2 16 25-3/16 23-1/2 31-1/16 24 77-3/8 72-1/4 1/2 1/2
(835) (465) (546) (406) (640) (597) (789) (610) (1965) (1835)
20 43-7/8 23-13/16 23-1/2 16 25-3/16 26-1/4 42-1/16 35 77-3/8 72-1/4 1/2 1/2
(1114) (605) (597) (406) (640) (667) (1068) (889) (1965) (1835)
25 43-7/8 29-5/16 23-1/2 16 25-3/16 34-1/2 42-1/16 35 77-3/8 72-1/4 3/4 1/2 OR 3/4
(1114) (745) (597) (406) (640) (876) (1068) (889) (1965) (1835)
30 54-7/8 34-13/16 26 17-1/2 26-11/16 37-1/4 53-1/16 46 77-3/8 72-1/4 3/4 1/2 OR 3/4
(1394) (884) (660) (445) (678) (946) (1348) (1168) (1965) (1835)
35 54-7/8 40-5/16 26 17-1/2 26-11/16 45-1/2 53-1/16 46 77-3/8 72-1/4 3/4 1/2 OR 3/4
(1394) (1024) (660) (445) (678) (1156) (1348) (1168) (1965) (1835)
40 60-3/8 45-13/16 26 17-1/2 26-11/16 51 58-9/16 51-1/2 77-3/8 72-1/4 3/4 1/2 OR 3/4
(1534) (1164) (660) (445) (678) (1295) (1487) (1308)

50 43-7/8 29-5/16 23-1/2 16 25-3/16 34-1/2 42-1/16 35 103-3/8 98-1/4 3/4 1/2 OR 3/4

(1114) (745) (597) (406) (640) (876) (1068) (889) (2626) (
60 54-7/8 34-13/16 26 17-1/2 26-11/16 37-1/4 53-1/16 46 103-3/8 98-1/4 3/4 1/2 OR 3/4
(1394) (884) (660) (445) (678) (946) (1348) (1168) (2626) (
70 54-7/8 40-5/16 26 17-1/2 26-11/16 45-1/2 53-1/16 46 103-3/8 98-1/4 3/4 1/2 OR 3/4
(1394) (1024) (660) (445) (678) (1156) (1348) (1168) (2626) (
80 60-3/8 45-13/16 26 17-1/2 26-11/16 51 58-9/16 51-1/2 103-3/8 98-1/4 3/4 1/2 OR 3/4
(1534) (1164) (660) (445) (678) (1295) (1487) (1308) (2626) (2496)

NOTE: REFER TO UNIT SUBMITTALS FOR MORE SPECIFICATIONS/UNIT ARRANGEMENTS.
DIMENSIONS ARE IN INCHES, DIMENSIONS IN PARENTHESIS ARE IN MILLIMETERS.
* “F” DIMENSION IS THE RECOMMENDED CLEARANCE TO SERVICE THE BURNER DRAWER(S).
▲“J” DIMENSION IS AN OUTSIDE DIMENSION FOR RETURN AIR DAMPERS.

§ “U” ALL DIMENSIONS ARE TABULATED FOR ROOFTOP ARRANGEMENTS B & D PER CAPACITIES 10 THROUGH 80 ACCORDINGLY
(CAPACITIES 50/80 ARE SHOWN PICTORIALLY).
NATURAL VENT UNIT DIMENSIONS SHOWN ABOVE; FOR POWER VENT DIMENSIONS, CONTACT CUSTOMER SERVICE FOR POWER
VENT UNIT SUBMITTAL SHEETS.

– 4 –

(1965) (1835)

2496)

2496)

2496)

Rooftop Packaged Unit

J Inside

Supply Opening

1-5/16" (33) Typ.
Anchor Hole
Location

5"

(127)

A

C (Typ.) Sq.

*

F

C

L

D

39"

(991)

G

1" (25)

Curb Cap

D4165
T4160CE

5/8" (16) Typ.
Anchor Hole
Location

6-1/16"

(154)

Vent Caps
Are Shipped
In Separate
Cartons

Gas
Connection

6-1/16"

(154)

Evaporative
Cooler

18-7/8" (479)

x J Typ.

Inside

Opening

34-3/4"

(883)

26"

(660)

18-7/8" (479)

x J Typ.

O.S. Damper

Opening

6-1/2"

(165)

3-9/16"

(90)

Lifting
Brackets

Electrical
Connections

Outside

§

R

§

Q

§

L

§

U

26"

(660)

26"

(660)

36"

(914)

with Evaporative Cooling

Figure 4 - Natural Vent Rooftop Unit with Evaporative Cooler (with Supply Plenum)

Table 2B

A.G.A. C.G.A. GAS INLET
CAPACITY A C D D *F G ▲J L Q R §U NAT LP

10 32-7/8 12 11 20-11/16 19-3/8 31-1/16 24 103-3/8 NA NA 98-1/4 1/2 1/2
(835) (305) (279) (525) (492) (789) (610) (2626) (2496)
15 32-7/8 21-1/2 16 25-3/16 23-1/2 31-1/16 24 103-3/8 NA NA 98-1/4 1/2 1/2
(835) (546) (406) (640) (597) (789) (610) (2626) (2496)
20 43-7/8 23-1/2 16 25-3/16 26-1/4 42-1/16 35 103-3/8 NA NA 98-1/4 1/2 1/2
(1114) (597) (406) (640) (667) (1068) (889) (2626) (2496)
25 43-7/8 23-1/2 16 25-3/16 34-1/2 42-1/16 35 103-3/8 NA NA 98-1/4 3/4 1/2 OR 3/4
(1114) (597) (406) (640) (876) (1068) (889) (2626) (2496)
30 54-7/8 26 17-1/2 26-11/16 37-1/4 53-1/16 46 103-3/8 NA NA 98-1/4 3/4 1/2 OR 3/4
(1394) (660) (445) (678) (946) (1348) (1168) (2626) (2496)
35 54-7/8 26 17-1/2 26-11/16 45-1/2 53-1/16 46 103-3/8 NA NA 98-1/4 3/4 1/2 OR 3/4
(1394) (660) (445) (678) (1156) (1348) (1168) (2626) (2496)
40 60-3/8 26 17-1/2 26-11/16 51 58-9/16 51-1/2 103-3/8 NA NA 98-1/4 3/4 1/2 OR 3/4
(1534) (660) (445) (678) (1295) (1487) (1308) (2626) (2496)
50 43-7/8 23-1/2 16 25-3/16 34-1/2 42-1/16 35 129-5/16 58-3/4 38-5/8 124-1/4 3/4 1/2 OR 3/4
(1114) (597) (406) (640) (876) (1068) (889) (3285) (1492) (981) (3156)
60 54-7/8 26 17-1/2 26-11/16 37-1/4 53-1/16 46 129-5/16 58-3/4 38-5/8 124-1/4 3/4 1/2 OR 3/4
(1394) (660) (445) (678) (946) (1348) (1168) (3285) (1492) (981) (3156)
70 54-7/8 26 17-1/2 26-11/16 45-1/2 53-1/16 46 129-5/16 58-3/4 38-5/8 124-1/4 3/4 1/2 OR 3/4
(1394) (660) (445) (678) (1156) (1348) (1168) (3285) (1492) (981) (3156)
80 60-3/8 26 17-1/2 26-11/16 51 58-9/16 51-1/2 129-5/16 58-3/4 38-5/8 124-1/4 3/4 1/2 OR 3/4
(1534) (660) (445) (678) (1295) (1487) (1308) (3285) (1492) (981) (3156)

NOTE: REFER TO UNIT SUBMITTALS FOR MORE SPECIFICATIONS/UNIT ARRANGEMENTS.
DIMENSIONS ARE IN INCHES, DIMENSIONS IN PARENTHESIS ARE IN MILLIMETERS.
* “F” DIMENSION IS THE RECOMMENDED CLEARANCE TO SERVICE THE BURNER DRAWER(S).

▲“J” DIMENSION IS AN OUTSIDE DIMENSION FOR RETURN AIR DAMPERS.
▲“J” DIMENSION IS ALSO AN INSIDE DIMENSION FOR SUPPLY AIR (WITHOUT DAMPER).

§ “U” ALL DIMENSIONS ARE TABULATED FOR ROOFTOP ARRANGEMENTS C & E PER CAPACITIES 10 THROUGH 80 ACCORDINGLY
(CAPACITIES 50/80 ARE SHOWN PICTORIALLY).

NATURAL VENT UNIT DIMENSIONS SHOWN ABOVE; FOR POWER VENT DIMENSIONS, CONTACT CUSTOMER SERVICE FOR POWER
VENT UNIT SUBMITTAL SHEETS.

– 5 –

Air Handler Packaged Unit

18-7/8" (479)

x J Typ.

Damper

Opening

39"

(991)

5"

(154)

1" (25)
Curb Cap

5/8" (16) Typ.
Anchor Hole
Location

6-1/16"

(154)

72"

(1829)

51-1/2"

(1306)

6-1/2"

(165)

36"

(883)

Electrical
Connections

Evap.
Cooler

19" (483)

x B

Discharge

Opening

10-1/8"

(257)

A

Water
Inlet 1/4"

Overflow

3/4" Npt Drain
(Capped)

Intake
Filter

D3666B
T3672FR

1" (25) Typ.
Duct Flange

18-7/8" (479)

x J Typ.

Damper
Opening

39"

(991)

5"

(127)

1" (25)
Curb Cap

6-1/16"

(154)

5/8" (16) Typ.
Anchor Hole
Location

72"

(1829)

77-3/8"

(1964)

6-1/2"

(165)

36"

(883)

Electrical
Connections

Evap.
Cooler

19" (483)

x J

Discharge

Opening

6-1/16"

(154)

A

Water
Inlet 1/4"

Overflow

3/4" NPT Drain
(Capped)

Intake
Filter

D3667B
T3672FR

with Evaporative Cooling

Figure 5 - Standard Air Handler with Evaporative Cooler (without Supply Plenum)

Table 3

CAPACITY A B C G ▲J

20 43-7/8" 23-13/16" 21-15/16 42-1/16" 35"
(1114) (605) (557) (1068) (889)
40 60-3/8" 45-13/16" 30-3/16" 58-9/16" 51-1/2"
(1534) (1164) (767) (1487) (1308)

NOTE: REFER TO UNIT SUBMITTALS FOR MORE SPECIFICATIONS/UNIT ARRANGEMENTS.
DIMENSIONS ARE IN INCHES, DIMENSIONS IN PARENTHESIS ARE IN MILLIMETERS.

▲ “J” DIMENSION IS AN OUTSIDE DIMENSION FOR RETURN AIR DAMPERS.
▲ “J” DIMENSION IS ALSO AN INSIDE OPENING FOR SUPPLY AIR (WITHOUT DAMPERS)

Figure 6 - Standard Air Handler with Evaporative Cooler (with Supply Plenum)

– 6 –

16

15

EVAPORATIVE COOLER
PARTS IDENTIFICATION

32

4

5

14

13

6

7

8

9

10

11

112

1. Bulk Head Fitting (Drain Overfl ow)

2. Water Distribution Assembly

3. Clip Assembly (Water Distribution

Assembly)

4. Ball Valve

5. Line Filter

6. Brass Needle Cock Valve

7. Worm Clamp

8. PVC Flexible Hose

9. Pump Support Bracket

10. Pump

11. Poly Tubing - 1/4" O.D.

12. Pump Basket Screen

13. Float Valve

14. Media Pad ( 8" or Opt. 12" W)

15. Media Distribution Pad (2" x 8" x L or 2" x 12" x L)

16. Hood Water Distribution

– 7 –

INSTALLATION

3-1/4"

FLOAT VALVE

ROD LEVEL
ADJUSTMENT SCREW

1/4" TUBING
FROM COOLER

FAUCET WITH
HOSE BIBB

BRASS NEEDLE COCK

BRASS STOP COCK
WITH DRAIN

WATER SUPPLY

ROOF LINE

NUT AND FERRULE

D3870

This manual is for Evaporative Cooler Module Installations only.

Refer to the Installation and Service Manuals for Rooftop Packaged Units

and Outdoor Furnaces for these unit installations.

Mounting to Roof

1. Before positioning the unit in its permanent
location, make certain that the roof is capable
of carrying the load of this equipment. Note that
when the cooler is fi lled with water, the unit will be
much heavier than when dry . See “Performance and
Dimension Data” table for appropriate operating
weight.

2. If unit is to be mounted on a curb, refer to the curb
specifi cations for installation requirements.

3. Make cer tain that the mounting surface is level in
all directions.

4. Make certain that you have suffi cient means for
lifting the unit into place.

5. Installation must conform to local and national
building and safety codes.

6. The units are mounted on skid rails and are suitab le
for use on combustible fl ooring. It is recommended
that the skids be mounted either on solid planking or
on steel channels, but nev er on a soft tar roof where
the skids could sink and reduce the 4" clearance
between the bottom pan and the roof.

7. Inspect all internal parts of the cooler section to
determine if any damage has occurred during
shipment. See roof curb specifi cations at the end of
the manual.

Connecting the Water Supply

NOTICE: Soft water equipment should not be
attached to water lines going to the cooler. “Soft
Water” will cause corrosion and decrease the
effective life of the cooler.

Figure 7 - Float Valve Assembly

NOTICE: There will be a slight odor during the initial
start-up of the unit. The odor will disappear within
the fi rst few days of operation if the bleed-off is
adjusted correctly.

Faucet Use

1. To connect the water line to the water supply, install
a sillcock and water valve on the faucet.

2. Place tubing nut and ferrule on tube end, and insert
valve.

3. Tighten the nuts on the valve and the tube.

NOTICE: If a faucet is not to be used for the water
supply, install the valve on the water line to be used.
Follow the procedure above for securing the tubing
to the valve.

Figure 8 - Evaporative Cooler Water Connections

1. A water valve should be installed at a convenient

2. Place tube nut and ferrule over the end of the

3. Insert tubing into factory-installed fl oat valve and

location to allow water to be turned on and off. Use
1/4" tubing to supply water to Evaporative Cooler.
A water connector kit is available at your local
wholesaler.

tubing.
tighten securely.

– 8 –

Adjusting the Water Level and Float Valve

Fill the tank as follows:

1. Turn the water supply on. Fill the tank to a depth of
approximately 3.25" (82.6mm). While fi lling the tank,
check for good pressure and fl ow from the fl oat
valve.

2. The fl oat valve should shut down the water supply
at the 3.25" (82.6mm) level. It may be necessary to
adjust the fl oat valve by bending the rod. The rod
level adjustment screw should be set in lower notch
on lever.

3. Check the tank and all connections for leaks.

NOTE: The overfl ow fi tting is set so that the water
will begin to fl ow at the 3.25" (82.6mm) depth. It is
important that the water level not be above the pump
basket screen!

Adjusting the Water Flow

Proper water flow over the media is important.
Insufficient water flow will result in increased
accumulation of minerals on the media. Excessive water
fl ow will result in deterioration of the media and moisture
carryover.

1. Using the ball valve handle, adjust the water fl ow so
that the media is damp from the top to the bottom. If
you can see water fl owing on the entering side, your
water level is too high. Adjust the valve so that the
media is just damp on the entering side. Repeated
drying of the media will cause rapid buildup of
mineral deposits in the media. Drying is due to
improper adjustment of the water fl ow valv e, frequent
shut-down of the pump to control the evaporative
cooling/humidifi cation, or localized air velocities
across the surface of the media. The area where dry
spots occur will exhibit high mineral deposits. The
valve must be adjusted so that no dry spots appear
on entering or leaving side, and when adjusted
correctly, enough water will fl ow through the media to
wash out most of the airborne dirt and other debris.

2. Prior to start-up, it is recommended that the tank
be fi lled, and the pump turned on, allowing the
unit to run for approximately 10 minutes. Repeat
this procedure two times to help fl ush any dirt that
may have accumulated during shipping.

Bleed-Off

Bleed-Off is required to maintain the water quality of
the system. When water evaporates, minerals and
other impurities are left behind, impurities are scrubbed
from the air fl owing through the system, and make-up
water (even good quality make-up water) adds more
minerals and impurities. These form deposits on the
media during the evaporative process.Therefore, it is
important to bleed-off a small quantity of recirculating
water to keep the concentration of impurities under
control. The bleed-off rate required is dependent upon
the quality of the water used and the rate of evaporation.
As climate conditions change, the rate of evaporation
may increase, requiring an increase in the bleed-off rate.
It is recommended that the bleed-off rate be adjusted
for the maximum water evaporation. An indication of
insuffi cient bleed-off is a uniform build-up of minerals
on the entering air face of the media. If this condition is
observed, increase the rate of bleed-off until the mineral
deposits dissipate.

Adjusting the Bleed-Off

1. The bleed-off is attached to the PVC tee. This
bleed-off system will eliminate a small quantity of
water from recirculation, which will reduce scale
build-up. This water will drain through the attached
tube, and out through the overfl ow. Disposal of this
water should comply with local codes.

2. Adjust the bleed-off rate according to Table 4.

Table 4

Unit Size Seconds to Fill
Capacity 12 oz. Can

10/15 69 46
20/25/50 52 34
30/35/60/70 41 27
40/80 38 25

– 9 –

ELECTRICAL CONNECTIONS

HAZARDOUS VOL TAGE!

DISCONNECT ALL ELECTRIC
POWER INCLUDING REMOTE
DISCONNECTS BEFORE
SERVICING. Failure to
disconnect power before
servicing can cause severe
personal injury or death.

Refer to the unit data plate to determine the supply
voltage.

Do not service before disconnecting
power or there could be a potential for an electrical
shock hazard.

The motor name-plate and electrical rating on the
transformer should be checked before energizing the
unit electrical system. All external wir ing must conform
to ANSI/NFPA No. 70-1996, National Electrical Code
(or the latest edition of) and applicable local codes; in
Canada, to the Canadian Electrical Code, Part 1 CSA
Standard C22.1

“Dashed” lines represent either fi eld wiring (by others) or
optional equipment. Ref er to optional items (shown on wir­ing diagram included with unit) - these will be hard wired.

Do not jumper factory wiring.
Mis-wiring of safety circuits may result in fi r e
or death.

Do not use any tools (i.e. screwdriver,
pliers, etc.) acr oss the terminals to chec k f or po wer.
Use a voltmeter.

USE COPPER CONDUCTORS ONLY!
UNIT TERMINALS ARE NOT DESIGNED TO ACCEPT
OTHER TYPES OF CONDUCTORS. Failure to do so
may cause damage to the equipment.

It is recommended that the electrical power to each
unit be provided by a separate, fused, and permanently
live electrical circuit. A disconnect switch of suitable
electrical rating for each unit should be placed as close
to the controls as possible. Each unit must be electrically
grounded in accordance with the latest edition of the
National Electrical Code, ANSI/NFPA No. 70-1996, or
CSA Standard C22.1. Sample wiring connections are
depicted in Figures 9 & 10.

NOTICE: Consult the factory before making any
changes to factory wiring.

OPTIONAL FILL AND DRAIN KIT: Optional Evaporative

Cooler Fill and Drain Kit consists of two motorized valv es,
installed in the building, and piped and wired to the roof.
The kit eliminates the need to go to the roof to fi ll or drain
the cooler for seasonal changeover, and automatically
maintains the water level. See sample Figure 10. Refer
to the kit's instruction.

GROUNDING: Install a ground wire to suitable ground
according to local codes.

NOTICE: For all wiring connections, refer to the
wiring diagram shipped with the unit (either affi xed
to the side jacket or enclosed in the unit’ s installation
instruction envelope). Should any original wire
supplied with the unit have to be replaced, it m ust be
replaced with wiring material having a temperature
rating of at least 105°C.

– 10 –

ELECTRICAL CONNECTIONS (continued)

Figure 9

Figure 10

– 11 –

MAINTENANCE

Open all disconnect switches
and secure in that position before servicing unit.
Failure to do so may result in personal injury or
death from electrical shock.

Because of the nature of the evaporative process, algae
buildup, biological f ouling, scale build-up, and corrosion are
distinct possibilities. Proper water treatment and regularly
scheduled maintenance will minimize or eliminate most
problems.
a.) Cooling Pad Check List:
√ Reduce the number of on/off cycles.
√ Shade the pads and pump.
√ Dry pads out completely once every 24 hours.
√ Maintain a suitable water bleed-off rate.
√ Drain and disinfect the entire water system
quarterly.
√ Avoid harmful contaminants, including dust,
fumes, harsh cleaners, and water treatment
chemicals.
√ Circulate the recommended quantity of
water over the pads.
√ Avoid dry areas on the pads.
√ Clean the fi lters regularly.
b.) Controlling Algae:
Scale and mineral deposits can form on the
cooling pad because the mineral content of
the water is too high.

Increase the water fl ow over the face of the pads.
Make certain that the fl ow of water is even from

one end of the distribution pipe to the other end.
Clean and fl ush the distributor pipe regularly;

especially if dry areas appear on the pads.
Maintain the pH of the recirculating water

between 6 and 8.
Maintain suffi cient bleed-off rate.
For more details, check MUNTERS

®

Engineering

Bulletin EB-WTM-502 (included with this manual).

c.) Preventing Algae in the Evaporative Pads:
Algae needs light, moisture, and nutrients

to survive. Eliminating, or reducing, these
elements will help to control algae. For specifi c
details, see MUNTERS® Engineering Bulletin
EB-WTM-502 (included with this manual).

d.) Biological Fouling Control:
Uncontrolled growth of organic matter can lead to

plugged media, metal deterioration, and biologi­cal contamination of the airstream. Whenever the
possibility of biological contamination of water in
an airstream exists, transmittal of Legionnaire’s
Disease should be addressed. While there are
no reported cases of Legionnaire’s Disease as­sociated with rigid media type evaporativ e cooling
systems, the Legionella Pneumophila bacteria is
present in almost all water supplies. Howe v er , the
mere presence of the bacteria does not create a
hazard: the bacteria must be transmitted as an
aerosol in suffi cient densities to be infectious.

NOTICE: It is highly recommended that the services
of a water treatment company be retained to advise
on the proper treatment of the sump water for
biological, scale, and corrosion control. For more
information, see MUNTERS

®

Engineering Bulletin

EB-WTM-502 (included with this manual).

Maintenance Schedule

Regular maintenance is the key to successful service from
your Evaporativ e Cooler. Use the f ollowing schedule as a
guide to maintain you unit:

Maintenance Annual Annual

Requirements Start-Up Shut-Down
Changing Media At Beginning of 6th
Year or if Passages
are blocked
Cleaning Water
Pump √
Cleaning &
Touch-Up √
Adjusting Bleed-Off √
Periodic Inspection During Cooling During Cooling
Season Season
Washing Down As Required During
Media with Hose Season
Washing Inlet Filter
with Hose √ √
Drain Unit √

Following are e xplanations of the procedures outlined in
the above schedule.

Changing the Media

This should be done every 5 years or if passages become
blocked.

1. Remove fi lter/frame assemblies.

2. Disconnect the water hood panel from the top panel
by removing screws.

3. Snap out water distribution system.

4. Remove top media distribution pad.

5. Lift out media sections (Note the position of media
with respect to airfl ow. See Figure 11)

– 12 –

®

45° TYP.

15° TYP.

AIR FLOW

D3883

6. Replace with new CELdek

media sections. (See
replacement part section).
Aspen and other evaporative media will not work.

7. When re-installing media, be sure all media

sections are installed in the proper direction. See
Figure 11.

8. Replace top media distribution pad, water dis-

tribution system, water hood panel, and fi lter/frame
assemblies.

Figure 11 - Evaporative Cooling Media Pad Section

Cleaning the Water Pump

Do not allow the pump to topple over
or become submerged. Water will damage the pump
motor. This is not a submersible pump.

Washing the Media

Avoid splashing water on the blower
motor at all times (this could cause electrical
problems)!

1. Scale and dust should be washed off the intake side of

the media annually , using a garden hose and nozzle;
this will help to unclog passages.

2. Using a stiff brush, lightly br ush the intake edges of

the media. This will not harm the openings, but will
remove any hardened scale.

3. Occasionally, there will be a b uild-up of algae or odors.

The best solution for both of these problems is to
allow the pads to dry thoroughly on a regular basis.
If cooling is not needed at night during the cooling
season, allow the blower to run for a few hours after
the pump has been shut-down to dry pads daily.

4. During the cooling season, we recommend that

the pads be shut down nightly if possible with the
blower running to dry the pads out for a few hours
before the unit is shut down.

Washing the Inlet Filter

The pre-fi lter should be cleaned periodically as follows:

1. Turn the four latches and remove filter frame

assemblies.

2. Carefully remove the aluminum fi lters. Wash the fi lters

with warm water and a mild soap, rinse thoroughly.

3. Re-install in unit.

4. If the aluminum mesh fi lters are damaged or cannot

be cleaned, replace the mesh fi lter (See replacement
parts section).

Disassemble and clean water pump as follows:

1. Disconnect power.

2. Disconnect the liquid tight connector from the
junction box to remove cord and connector.

3. Disconnect the pump mounting bracket and hose.

4. Remove the pump and basket screen.

5. To clean pump, snap out base of the pump; notice
the impeller.

6. Using a mild detergent solution, wash all deposits
from the impeller and the impeller base plate.

7. Spin the impeller to dislodge any foreign material.
Make sure that the impeller spins freely.

8. Carefully snap the impeller and impeller base plate
back onto the pump.

9. Wash the pump basket screen using the same
detergent solution, and rinsing thoroughly to remove
any debris. If unable to clean, replace with a new
screen (See replacement part section).

NOTICE: The pump motor does not require any
lubrication.

Cabinet Cleaning and Touch-Up

The cabinet and all internal parts of the Evaporative Cooler
should be cleaned annually using a soft cloth, warm water,
and a mild cleanser.

NOTE: Avoid using steel wool or sandpaper in normal
cleaning of the unit.

Winter Shut Down

1. Clean and fl ush out Evaporative Cooler media and
sump.

2. Clean water distributor holes.

3. Drain fi ll pipe and leave open. DO NOT LEAVE ANY
WATER IN THE SYSTEM. FREEZING CAN CA USE
MAJOR DAMAGE TO THE UNIT.

4. Remove and clean pump if necessary.

5. Check sump tank for leaks and repair if necessary.
Sump tank is fabricated from stainless steel.

– 13 –

Roof Curb Kit - RC015* (-1, -2, -3, -4)

For use with:

Unit type (UT) - EV

Capacities (CA) - 10/40

*Evaporative Cooler Platform Only

(Included with Roof Curb Kit No's RC002, RC004, RC008, RC012)

Roof Curb Kit RC015
Contents:

1 Evaporative Cooler Assembly (sold separately)
2 Curb (2 platforms per kit)
3 1/4-20 “KEPS” Nut (8) required
4 1/4-20 x 5/8 LG. Hex HD. Bolt (8) required

Club Platform to Unit Assembly

Approximate Curb Kit

Shipping Weight

Curb Kit No. Capacity (CA) Weight (lbs.)

RC015-1 10/15
RC015-2 20/25/50
RC015-3 30/35/60/70
RC015-4 40/80
1 lb. = 0.453 kg

30

*One Platform Kit fi ts All Evaporative Cooler Modules/Capacities (CA) - 10/80

Capacities 50, 60, 70 and 80 are for (RT/PV) unit types only.

– 14 –

How to order Replacement Parts

Please provide the following information to your local representative:

• Model Number

• Serial Number (if any)

• Part Description and Number as shown in Replacement Parts Literature
If further assistance is needed, please contact the manufacturer's customer service department.

Evaporative Cooler Model Number Description

Digit E X X — E V 3* 4* 0 0 0 0 0 0 11* 0 0 0 0 16* 17* +
Item Prefi x UT CA FT FM RA CO GT GC SV MT MS AI AC AS

(Internal use Only)

*See Model No. Description below.

1, 2 - Unit Type [UT]

EV - Evaporative Cooler Only

3, 4 - Capacity [CA]

10 - 100,000 BTU/HR
15 - 150,000 BTU/HR
20 - 200,000 BTU/HR
25 - 250,000 BTU/HR
30 - 300,000 BTU/HR
35 - 350,000 BTU/HR

40 - 400,000 BTU/HR

5 - Furnace Type [FT]

0 - None

6 - Furnace Construction Material [FM]

0 - None

7 - Rooftop Arrangement [RA]

0 - None

8 - Coil Options [CO]

0 - None

9 - Gas Type [GT]

0 - None

10 - Gas Control [GC]

0 - None

11 - Supply Voltage [SV]

1 - 115/1/60
2 - 208/1/60

3 - 230/1/60

12 - Motor Type [MT]

0 - None

13 - Motor Sizes [MS]

0 - None

14 - Air Inlet Confi guration [AI]

0 - None

15 - Air Control & Damper Arrangement [AC]

0 - None

16 - Accessories [AS]

C1 - Evap. Cooler - Fill & Drain Kit
C2 - Evap. Cooler - 12" Celdek
C3 - Evap. Cooler - Freezestat

D1 - Time Clock - 7 Day
D2 - Time Clock - 24 Hour

E2 - G.F .I. Conv enience Outlet 115V AC
E3 - Remote Control Panel

F1 - Ductstat - One Stage
F2 - Ductstat - T wo Stage

G1 - Thermostat - T87F w/Subbase
G2 - Thermostat - T87F w/Subbase & Guard
G3 - Thermostat - T834H w/Subbase (Sterling Stat)
G4 - Thermostat - T7300 - 7 Day Programmable
G5 - Thermostat - T874 (T wo Stage)

H1 - Return Firestat
H2 - Supply Firestat
H3 - Freezestat

L1 - 30 Amp, Fused Disconnect Switch
L2 - 30 Amp, Non Fused Disconnect Switch
L3 - 60 Amp, Fused Disconnect Switch
L4 - 60 Amp, Non Fused Disconnect Switch

0 - Other (Specify)

®

Media

LIMITED W ARRANTY

The complete unit is warranted by the manufacturer to be free from defects in material and workmanship for a
period of one (1) year from the date of manufacture.

The manufacturer will repair or replace, at its option, any component which, upon inspection, it fi nds to be
defective, provided that the unit has been operated within its listed capacity, has been installed in accordance with
the furnished instructions, has not been misused or subjected to negligence and has received reasonable and
necessary maintenance. The warranty does not cover labor costs or other costs incurred in repairing, removing,
installing, servicing or handling of parts or completed products.

The warranty does not cover loss due to corrosion by chemicals precipitated in the air such as halogenated
hydrocarbons. The manufacture will in no event be liable for incidental or consequential damages of any kind
whatsoever.

Written permission is required prior to the return of defective components. All returns must be sent with all
transportation charges prepaid to the plant designated in the written permission.

This warranty is extended only to the original owner of the unit.

– 15 –

260 NORTH ELM ST., WESTFIELD, MA 01085

TEL: [phone] FAX: [phone]

www.mestek.com