WHITE-RODGERS

8A18Z-2

Evaporative Cooler Control

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 enclosure 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 automatic 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.

If in doubt about whether your wiring is millivolt, line, or low 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 components could cause the control to malfunction.

!

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.

!

WARNING

Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.

WHITE-RODGERS DIVISION

EMERSON ELECTRIC CO.

9797 REAVIS ROAD

ST. LOUIS, MISSOURI 63123-5398

Printed in U.S.A.

PART NO. 37-5918B

Replaces 37-5918A

9909

SPECIFICATIONS

Electrical Ratings:

Input Voltage: 120 or 240 VAC, 60 Hz.

Operating Ambient Temperature Range:

40 to 150

°

F (5 to 65

°

C)

Power Consumption:

6 Watts nominal with all three relays energized

Fan Rating:

12 FLA., 72 LRA; 120 VAC

6 FLA., 36 LRA; 240 VAC

Pump Rating:

10 FLA., 60 LRA: 120 VAC

5 FLA., 30 LRA; 240 VAC

Combined Total Connected Load:

16 FLA., 120 VAC

8 FLA., 240 VAC

Mounting:

Four 9 ⁄

32

” Dia. holes

(2 1 ⁄

2

” x 5” center line to center line)

Dimensions:

6” wide x 8” high x 3” deep

Line connections

8A18Z-2

The 8A18Z-2 Evaporative Cooler Control consists of three relays and a low voltage transformer with dual voltage primary. The pump relay is automatically operated, which allows the cooler pads to become wet before the fan starts. This will eliminate the fan from blowing dust, warm air, and odor on initial start-up. The fan relay controls operation of the fan without the pump when the thermostat subbase is in the vent position, and controls operation of both fan and pump when the thermostat subbase is in the cool position.

Pump connections

Fan connections

L1

LO

HI

N 120V L2 240V

P2 120V P2 240V

F2 120V F2 240V

P1

Fan timer relay

Figure 1. Panel assembly

Y

G

R

W

Low voltage transformer

Pump relay

Low voltage thermostat connections

Fan speed relay

INSTALLATION

1. Remove cover screw. To remove cover, pull cover outward at the top, then lift cover off the locating tabs at the bottom of the case.

2. Remove panel assembly from case and discard packing material.

NOTE

Place panel assembly in a safe location to prevent damage to the panel while installing the case.

3. Determine which knockouts will be used for electrical conduits, then remove electrical knockouts from case before mounting.

Bolts

Case

Flat washers

Mounting holes for four bolts and washers

Panel mounting screws

Cover screw

Panel

Cover

Figure 2. Installing control

NOTE

If the larger knockout is to be removed, remove the smaller knockout before removing the larger one.

4. To remove the knockouts, place a screwdriver on the knockout at the location indicated by the arrow

(see fig. 3). Tap the screwdriver to pop the knockout out of the case. If the knockout is not completely removed, carefully use pliers to twist the knockout until it comes out.

Figure 3. Electrical knockouts

2

5. Select an appropriate location for mounting the control. Position the case on a smooth flat surface in a vertical position only (with electrical knockouts down).

Mount the case using flat washers and screws (not provided) through the four mounting holes in the back of the case.

NOTE

Install conduit, then run wiring and install the thermostat according to thermostat installation instructions (included with thermostat) before installing panel assembly in case.

INSTALLATION (cont’d)

All wiring should be done in accordance with local and national electrical codes and ordinances.

N

120V

HOT

GND

PUMP MOTOR

(120 V)

COM

L0

HI

2-SPEED FAN

(120 V)

120 VAC DIAGRAM

1F51-619 or 1F51W-619 THERMOSTAT

R W Y G

8A18Z-2

N 120V L2 240V

P2 120V P2 240V

F2 120V F2 240V

L1 P1

PUMP

RELAY

L0

LO SPEED

FAN

HI

HI SPEED

FAN

FAN

TIMER

RELAY

R

PUMP

RELAY

W

FAN SPEED

RELAY

Y

FAN TIMER

RELAY

G

INTERNAL WIRING

FIELD INSTALLED WIRING

ELECTRICAL CONNECTION

!

CAUTION

Non-metallic enclosure does not provide grounding between conduit connections. Use grounding bushings and jumper wires to ensure proper grounding of control.

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.

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 assembly 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.

L2

240V

HOT

L1

HOT

GND

PUMP MOTOR

(240 V)

COM

L0

HI

2-SPEED FAN

(240 V)

240 VAC DIAGRAM

1F51-619 or 1F51W-619 THERMOSTAT

R W Y G

8A18Z-2

N 120V L2 240V

P2 120V P2 240V

F2 120V F2 240V

L1 P1

PUMP

RELAY

L0

LO SPEED

FAN

HI

HI SPEED

FAN

FAN

TIMER

RELAY

R

PUMP

RELAY

W

FAN SPEED

RELAY

Y

FAN TIMER

RELAY

G

INTERNAL WIRING

FIELD INSTALLED WIRING

ELECTRICAL CONNECTION

Figure 4. Typical wiring diagrams

!

CAUTION

Do not over tighten panel mounting screws to avoid damage to the panel assembly.

8. Connect wires to proper terminals (see fig. 4 for typical wiring connections).

!

CAUTION

Do not press against panel assembly while tightening terminal screws to avoid damage to the panel assembly.

9. Replace cover and test operation per the checkout section.

WIRING

!

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.

CHECKOUT

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 thermostat switch to “COOL”. Nothing should happen provided 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.

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.

4. Turn fan switch to “HI” position. The fan should now be operating on high speed.

5. Turn thermostat switch to “VENT” position. The pump should stop immediately.

6. Turn the thermostat switch to “OFF” position. After a delay of 3 to 30 seconds, the fan should stop running.

3

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.

Scale

Differential: 1°F

Dimensions: 3¼” x 4½” x 1⅝”

________________________________________SAFETY_________________________________________

Installation of this equipment should be done by an experienced • Improper connections could cause shock service technician.

CAUTION: To prevent electrical shock and equipment damage, disconnect electrical power to system at main fuse or circuit breaker box, until installation is complete.

WARNING: • Do not exceed the specification ratings on this control. Check the manufacturer’s information supplied with the associated product. or fire hazard.

• 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.

_____________________________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:

1. Locate it about 5 ft. above the floor.

2. Install it on a partitioning wall, not on an outside wall.

3. Never expose it to direct light from lamps, sun, fireplaces, or any temperature radiating equipment.

4. Avoid locations close to doors that lead outside, windows or adjoining outside walls.

5.

6.

7.

Avoid locations close to air registers, or in the direct path of air from them.

Make sure there are no pipes or duct work in that part of the wall chosen for the thermostat location.

Never locate it in a room that is warmer or cooler than the rest of the home.

8. Avoid location with lack of air circulation, such as behind doors or alcoves.

9. The living or dining room is normally a good location provided there is no cooking range or refrigerator on opposite side of wall.

_____________________________________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 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 through 5. The number “1” represents the cooler 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

FAN SYSTEM

HI LO OFF COOL VENT

FAN

TIMER RELAY

○ ● ●

FAN

SPEED RELAY

PUMP

RELAY

COMPONENT OPERATION

●

●

●

●

●

●

●

●

●

●

●

●

●

Indicates switch position on thermostat sub-base and

system function in operation.

○ If left in “HI” position-no Fan, but fan speed relay will

remain energized.

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.*

* Fan timer relay energized in approximately one minute. When system

shuts off, it opens in approximately ½ minute.

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