8A18Z-2
Evaporative Cooler Control
WHITE-RODGERS
INSTALLATION INSTRUCTIONS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
This Evaporative Cooler Control has a rain-proof enclo-
sure and can be used with either 120 VAC or 240 VAC
systems. It was designed for use with the White-Rodgers
1F51-619 or 1F51W-619 Thermostat to provide auto-
matic temperature and ventilation control and remote fan
speed selection of an evaporative cooler with 2-speed
fan. The pump relay is automatically operated to allow
wetting of cooler pads before starting fan.
PRECAUTIONS
CAUTION
To prevent electrical shock and/or equipment
damage, disconnect electric power to system, at
main fuse or circuit breaker box, until installation
is complete.
Ifindoubtaboutwhetheryourwiringismillivolt,line,orlow
voltage, have it inspected by a qualified heating and air
conditioning contractor, electrician, or someone familiar
with basic electricity and wiring.
!
Do not exceed the specification ratings.
All wiring must conform to local and national electrical
codes and ordinances.
This control is a precision instrument, and should be
handled carefully. Rough handling or distorting compo-
nents could cause the control to malfunction.
WARNING
Do not use on circuits exceeding specified volt-
age.Highervoltagewilldamagecontrolandcould
cause shock or fire hazard.
!
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
PART NO. 37-5918B
Replaces 37-5918A
Printed in U.S.A.
9909
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INSTALLATION(cont’d)
5. Select an appropriate location for mounting the con- All wiring should be done in accordance with local and
trol. Position the case on a smooth flat surface in a national electrical codes and ordinances.
vertical position only(with electrical knockouts down).
120 VAC DIAGRAM
Mount the case using flat washers and screws (not
provided) through the four mounting holes in the back
of the case.
N
1F51-619 or 1F51W-619 THERMOSTAT
120V
W
Y
G
R
HOT
8A18Z-2
GND
N
L2
P2
F2
120V
120V
120V
240V
240V
240V
R
P2
F2
NOTE
W
Y
PUMP
RELAY
FAN SPEED
RELAY
Install conduit, then run wiring and install the thermostat
according to thermostat installation instructions (included
withthermostat)beforeinstallingpanelassemblyincase.
L1
P1
PUMP
RELAY
PUMP MOTOR
(120 V)
G
FAN TIMER
RELAY
L0
HI
LO SPEED
FAN
FAN
TIMER
RELAY
L0
COM
HI SPEED
FAN
HI
2-SPEED FAN
(120 V)
CAUTION
!
INTERNAL WIRING
FIELD INSTALLED WIRING
ELECTRICAL CONNECTION
Non-metallicenclosuredoesnotprovideground-
ingbetweenconduitconnections.Usegrounding
bushings and jumper wires to ensure proper
grounding of control.
240 VAC DIAGRAM
1F51-619 or 1F51W-619 THERMOSTAT
L2
HOT
HOT
240V
L1
W
Y
G
R
8A18Z-2
6. After wiring is run into case, bend the wires out slightly
so that the wires will be in front of the panel assembly
when it is installed.
GND
N
L2
P2
F2
120V
120V
120V
240V
240V
240V
R
P2
F2
W
Y
PUMP
RELAY
7. Loosen the three panel mounting screws in the case
approximately one turn. Slide the two slots located at
the top of the panel assembly under the two mounting
screws at the top of the case. Lower the panel assem-
bly into the case until the bottom mounting screw
protrudes through the keyhole slot on the panel. Slide
the panel assembly up toward the top of the case, then
hold the panel assembly in place while tightening all
three mounting screws.
FAN SPEED
RELAY
L1
P1
PUMP
RELAY
PUMP MOTOR
(240 V)
G
FAN TIMER
RELAY
L0
HI
LO SPEED
FAN
FAN
TIMER
RELAY
L0
COM
HI SPEED
FAN
HI
2-SPEED FAN
(240 V)
INTERNAL WIRING
FIELD INSTALLED WIRING
ELECTRICAL CONNECTION
Figure 4. Typical wiring diagrams
CAUTION
!
CHECKOUT
Do not over tighten panel mounting screws to
avoid damage to the panel assembly.
1. After mounting and wiring has been completed, set
thermostat switch to “OFF” position and fan switch to
“LO” position. Turn thermostat lever to “5” and thermo-
stat switch to “COOL”. Nothing should happen pro-
vided the room temperature is below 95°F.
2. Turn thermostat lever to “1”. The pump should start
immediately, provided the room temperature is above
55°F.
8. Connect wires to proper terminals (see fig. 4 for typical
wiring connections).
CAUTION
!
Do not press against panel assembly while tight-
ening terminal screws to avoid damage to the
panel assembly.
3. After a time delay of 30 to 120 seconds to allow the
cooling pads to become soaked, the fan should start
running at low speed.
9. Replace cover and test operation per the checkout
section.
4. Turn fan switch to “HI” position. The fan should now be
operating on high speed.
WIRING
5. Turn thermostat switch to “VENT” position. The pump
should stop immediately.
CAUTION
!
6. Turn the thermostat switch to “OFF” position. After a
delay of 3 to 30 seconds, the fan should stop running.
To prevent electrical shock and/or equipment
damage, disconnect electric power to system at
main fuse or circuit breaker box until installation
is complete.
3
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INSTALLATION INSTRUCTIONS
1F51-619
LOW VOLTAGE
EVAPORATIVE COOLER
THERMOSTAT
READ ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL
The 1F51-619 low voltage thermostat is designed to
operate
with
the
White-Rodgers
8A18Z-1
Evaporative Cooler Control. For versatility, the
thermostat sub-base has a System Switch that lets
you select VENT, COOL, or OFF positions, while the
Fan Switch offers the selection of LOW or HIGH fan
speed.
____________________________________SPECIFICATIONS_____________________________________
Electrical Rating: 30V.A.C. Max.
Switch Action: SPST-Sealed Mercury Contacts
close on temperature rise.
Temperature Scale Range: 1 to 5 (Cooler to Warmer)
Differential: 1°F
Dimensions: 3¼” x 4½” x 1⅝”
________________________________________SAFETY_________________________________________
Installation of this equipment should be done by an experienced
service technician.
• Improper connections could cause shock
or fire hazard.
CAUTION: To prevent electrical shock and equipment
damage, disconnect electrical power to system at main fuse
or circuit breaker box, until installation is complete.
• All wiring must conform to local and
national electrical codes and ordinances.
• Rough handling, tampering or distorting
components of control, could cause the
control to malfunction.
WARNING: • Do not exceed the specification ratings on this
control. Check the manufacturer’s information
supplied with the associated product.
_____________________________SELECTING THERMOSTAT LOCATION__________________________
The proper location of the room thermostat is most
important to insure that it will provide a comfortable
home temperature. Observe the following general rules
when selecting a location:
5. Avoid locations close to air registers, or in the direct
path of air from them.
6. Make sure there are no pipes or duct work in that
part of the wall chosen for the thermostat location.
1. Locate it about 5 ft. above the floor.
7. Never locate it in a room that is warmer or cooler
than the rest of the home.
2. Install it on a partitioning wall, not on an outside wall.
8. Avoid location with lack of air circulation, such as
behind doors or alcoves.
3. Never expose it to direct light from lamps, sun,
fireplaces, or any temperature radiating equipment.
9. The living or dining room is normally a good location
provided there is no cooking range or refrigerator on
opposite side of wall.
4. Avoid locations close to doors that lead outside,
windows or adjoining outside walls.
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_____________________________________INSTALLATION______________________________________
Attaching Sub-Base to Wall
1. Route wire from cooling equipment to thermostat location
and pull wires through hole in wall so that 6 in. of cable
protrudes.
2. Pull wires through opening near center of sub-base and
connect wires beneath proper terminal screws as shown
under “wiring”.
3. Push excess wire into wall or switch box and plug up hole
with non-combustible material to prevent drafts from
affecting thermostat operation.
4. Fasten sub-base loosely to wall in position shown in Fig. 1
using two mounting screws provided. Level sub-base by
placing spirit level on bottom of sub-base. Tighten
mounting screws to secure sub-base in level position.
Mounting Thermostat to Sub-Base
1. Remove cover from thermostat by pulling it straight
outward.
2. Attach thermostat base to sub-base, being sure that all
through 5.
The number “1” represents the cooler
screws are tightened snugly since they serve as electrical
connections between thermostat and sub-base.
3. Snap on thermostat cover and set thermostat to desired
setting. The thermostat scale range has numbers from 1
controlling temperature, and number “5” represents the
warmer controlling temperature.
________________________________________WIRING_________________________________________
All wiring should be done according to local and national
electrical codes and ordinances.
NOTE: See Instruction Sheet on 8A18Z-1 Evaporative Cooler
Control for typical system hook-up.
______________________________________OPERATIONS______________________________________
The chart below illustrates system and thermostat function during various modes of operation.
SUBBASE SWITCH POSITIONS
SYSTEM FUNCTIONS
COMPONENT OPERATION
FAN
LO
SYSTEM
COOL
FAN
TIMER RELAY
FAN
SPEED RELAY
PUMP
RELAY
HI
OFF
VENT
NO FAN-NO PUMP-NO COOL
○
●
●
COOLING MODE-Pump relay and fan timer
relay energized by thermostat. Water begins
circulating on cooler pads, fan will start on low
speed after a short time-delay.*
COOLING MODE-Pump relay and fan timer
relay energized by thermostat. Fan speed relay
is energized by fan switch in “HI” position.
Water begins circulating on cooler pads, fan will
start on high speed after a short time-delay.*
VENT MODE-Fan timer relay energized by
thermostat. Fan speed relay is energized by
fan switch in “HI” position. Fan will start on high
speed after a short time-delay.
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
VENT MODE-Fan timer relay energized by
thermostat. Fan will start on low speed after a
short time-delay.*
●
● Indicates switch position on thermostat sub-base and
system function in operation.
* Fan timer relay energized in approximately one minute. When system
shuts off, it opens in approximately ½ minute.
○ If left in “HI” position-no Fan, but fan speed relay will
remain energized.
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If you need further information about this product, please write to
White-Rodgers Division, Emerson Electric Co.
9797 Reavis Road
St. Louis, MO 63123-5398
Attention: Technical Service Department
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