White Rodgers 8A18Z-2 Attaching Sub-Baseto Wall, Mounting Thermostat to Sub-Base

_____________________________________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		FAN	FAN	PUMP	COMPONENT OPERATION
						TIMER RELAY	SPEED RELAY	RELAY
HI		LO	OFF	COOL	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.

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

*Fan timer relay energized in approximately one minute. When system shuts off, it opens in approximately ½ minute.