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.
