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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 mount-
ing 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.
INSTALLATION
CAPTIVE
SCREW
CAPTIVE
SCREWS
THERMOSTAT
BASE
COVER
MOUNTING SCREWS
SUBBASE
Y G
W R
HI LO
COOL
O
FF
V
E
N
T
COOLING
ANTICIPATOR
THERMOSTAT
SUBBASE
FAN
HI LO
SYSTEM
OFF COOL VENT
SUBBASE SWITCH POSITIONS SYSTEM FUNCTION
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.*
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.*
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.*
In "HI" position - No fan, but fan speed relay will
remain energized
Indicates switch position on thermostat subbase and
system function in operation.
* Fan timer relay energizes in approximately one minute. When
system shuts off, relay de-energizes in approximately 1/2 minute.
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.
WIRING
Take care when securing and routing wires so they
do not short to adjacent terminals or rear of ther-
mostat. Personal injury and/or property damage
may occur.
All wiring should be installed according to local
and national electrical codes and ordinances.
Refer to instruction sheet for 8A18Z-2, Evaporative
Cooler Control for typical system hookup.
OPERATION
The chart below illustrates system and thermostat function during various modes of operation.
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