White Rodgers 8A18Z-2 Specifications, Installation, Electrical Ratings, Power Consumption

SPECIFICATIONS

Electrical Ratings:

Input Voltage: 120 or 240 VAC, 60 Hz.

Operating Ambient Temperature Range:

40to 150°F (5 to 65°C)

Power Consumption:

6Watts nominal with all three relays energized

Fan Rating:

12FLA., 72 LRA; 120 VAC

6FLA., 36 LRA; 240 VAC

Pump Rating:

10FLA., 60 LRA: 120 VAC

5FLA., 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 oper- ated, 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

N 120V L2 240V

P2 120V P2 240V

F2 120V F2 240V

L1

LO P1

HI

	Low voltage
	transformer
	Pump relay
R
W	Low voltage
Y	thermostat
	connections
G
	Fan
	speed
	relay
Fan timer
relay

Figure 1. Panel assembly

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 pack- ing material.

NOTE

Place panel assembly in a safe location to prevent dam- age 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.

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.

Flat washers	Mounting holes
	for four bolts
	and washers
	Panel mounting
	screws

Cover screw

Bolts

Case

Panel

Cover

Figure 2. Installing control

Figure 3. Electrical knockouts

2