White Rodgers 1F51N-619 User Manual

Operator: Save these instructions for future use!

CAUTION

!

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.

DESCRIPTION

This low voltage thermostat is designed to operate with
the White-Rodgers 8A18Z-2 Evaporative Cooler Control.
For versatility, the thermostat subbase has a System
Switch that lets you select VENT, COOL or OFF posi­tions. The Fan Switch offers the selection of LOW or
HIGH fan speed.

PRECAUTIONS

1F51N-619

Low Voltage

Evaporative Cooler Thermostat

INSTALLATION INSTRUCTIONS

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.

SPECIFICATIONS

ELECTRICAL DATA
Switch Rating: 24VAC (30VAC max.)

Cooling - 0 to 1.5 Amps

Switch Action: SPST - Snap Action switch

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

Do not short out terminals on gas valve or primary
control to test. Short or incorrect wiring will burn
out heat anticipator and could cause personal
injury and/or property damage.

WARNING

!

Do not use on circuits exceeding 30 volts. Higher
voltage will damage control and could cause shock
or fire hazard.

THERMAL DATA
Temperature Scale Range: 1 to 5 (Cooler to Warmer)
Differential: 1°F

ATTENTION!

This product does not contain mercury. However, this product may replace a unit which contains mercury. Do not open mercury cells. If a
cell becomes damaged, do not touch any spilled mercury. Wearing non-absorbent gloves, take up the spilled mercury with sand or other
absorbent material and place into a container which can be sealed. If a cell becomes damaged, the unit should be discarded. Mercury must
not be discarded in household trash. When the unit this product is replacing is to be discarded, place in a suitable container and refer to
www.white-rodgers.com for location to send the product containing mercury.

White-Rodgers is a division

of Emerson Electric Co.

www.white-rodgers.com

PART NO. 37-6960A

0822

INSTALLATION

ATTACH SUBBASE TO WALL

1. Route wires from the cooling equipment to the thermostat
location and pull wires through hole in wall so that 6 inches
of cable protrudes.

2. Pull wires through opening near center of subbase and
connect wires beneath terminal screws as shown under
wiring.

3. Push excess wiring into wall and plug hole with fire-resistant
material (such as fiberglass insulation) to prevent drafts
from affecting thermostat operation.

4. Fasten subbase loosely to wall, as shown, using two mount­ing screws. Place a level against bottom of subbase, adjust
until level, and then tighten mounting screws to secure
subbase.

ATTACH THERMOSTAT TO SUBBASE

1. Remove cover from thermostat base by gripping the base in
one hand. Use the other hand to pull gently at the top or
bottom of the cover.

2. Carefully remove the shipping protective packing from the
switch.

WIRING

MOUNTING SCREWS

CAPTIVE

SCREW

SUBBASE

CAPTIVE
SCREWS

COVER

THERMOSTAT

BASE

3. Attach thermostat base to subbase, being sure that all
captive screws are tightened snugly, since they serve as
electrical connections between thermostat and subbase.

4. Snap cover on thermostat base and set temperature lever to
desired setting. The thermostat scale has numbers from 1 to

5. The lower numbers represent cooler temperature and the
higher numbers represent warmer temperature.

Take care when securing and routing wires so they
do not short to adjacent terminals or rear of ther­mostat. Personal injury and/or property damage

COOLING

ANTICIPATOR

may occur.
All wiring should be installed according to local

and national electrical codes and ordinances.

HI LO

COOL

FF

O

V

Refer to instruction sheet for 8A18Z-2, Evaporative
Cooler Control for typical system hookup.

Y G

W R

OPERATION

The chart below illustrates system and thermostat function during various modes of operation.

SUBBASE SWITCH POSITIONS SYSTEM FUNCTION

FAN

HI LO

SYSTEM

OFF COOL VENT

FAN

TIMER

RELAY

FAN
SPEED
RELAY

PUMP

RELAY

COMPONENT OPERATION

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 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 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 short time delay.*

VENT MODE - Fan timer relay energized by thermostat. Fan
will start on low speed after short time delay.*

THERMOSTAT

SUBBASE

E

N

T

In "HI" position - No fan, but fan speed relay will
remain energized

Indicates switch position on thermostat subbase and
system function in operation.

2

* Fan timer relay energizes in approximately one minute. When
system shuts off, relay de-energizes in approximately 1/2 minute.

The Emerson logo is a
trademark and a service mark
of Emerson Electric Co.