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530.70-N1.11Y
Unitary Products Group 3
The new thermostat requires a thermostat cable with a mini-
mum of 10 conductors that run from the sub-base to the con-
trol box. The new wire will be connected as shown in Figure
3.
1. Locate the W7400 control module in the box-electric
(Figures 1 and 2).
2. Remove the following wires form the W7400 control
module and from the unit.
•201/R
•208/BR
•254/GY
•252/Y
•257/Y
•248/GY
•240/Y
•244/0
•246/PR
NOTE:
Wire ties will need to be removed to remove above
wires.
3. Disconnect wire 204/BR from the TR terminals on the
w7400 control module.
NOTE:
These wires will be used with the new controls.
4. Disconnect thermostat wire from terminals 1-4 on the
W7400 control module.
NOTE:
This wire will be used with the new controls.
NOTE: STEPS 5 THROUGH 7 ARE FOR OPTIONAL HEAT
ONLY.
TABLE 3: PARTS SUPPLIED FOR CV UNITS WITH
OPTIONAL HEAT
QTY PART NO. DESCRIPTION
1 373-18689-610
820/Y
823/Y
1 373-18689-611
822/BR
826/BR
1 AB144GRA7171844 844/GY
1 AB144WHT7171845 845/W
2 024-24116-000 Isolation Relay
FIGURE 1: POWER & CONTROL WIRING
LOCATION
FIGURE 2 : EXISTING CONTROL PANEL COMPO-
NET LOCATION
FIGURE 3 : TYPICAL THERMOSTAT WIRING
OPEN ALL DISCONNECTS BEFORE SERVIC-
ING THIS UNIT.