507746-01
Issue 1821
Page 15 of 39
AIR HANDLER CONTROL COMES FROM FACTORY WITH A
METAL JUMPERS BETWEEN W1 TO W2 AND W2 TO W3. SEE
FIGURE 22 FOR HEAT SECTION CONFIGURATION.
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
BCE7S
COMFORT SYNC™
AIR
CONDITIONER
UNIT
(TWO-STAGE)
RED
BROWN
YELLOW
BLUE
BLACK
1
1
R
W3
W2
W1
O
Y1
Y2
G
DS
C
R
H
W2
W1
O
L
Y1
Y2
G
D
B
C
Y1-Y2
2-STAGE
COMPR
R-O
HEAT
PUMP
R-DS
DEHUM
OR
HARMONY
CUT FOR OPTIO
N
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE AC
DO NOT CUT ON-BOARD LINK R -O.
IMPORTANT — USE CARE WHEN CUTTING
ON-BOARD LINKS TO PREVENT DAMAGE TO
CONTROL. SEE FIGURE 19, BCE7S JUMPER AND
LINK GUIDE, FOR FURTHER DETAILS.
AIR HANDLER
CONTROL
Figure 15. Control (Field Wiring) – Cooling Application (Non-Communicating)
HEAT PUMP
UNIT
(TWO-STAGE)
X2658 OUTDOOR SENSOR IS REQUIRED FOR OUTDOOR
TEMPERATURE DISPLAY, DEW POINT CONTROL, HEAT
PUMP AND DUAL FUEL BALANCE POINTS.
R
R
R
W3
H
W2
W2
W1
W1
W1
O
O
O
L
L
Y1
Y1
Y1
Y2
Y2
G
G
C
C
C
T
T
D
B
Y2
DS
O. D.
SENSOR
(X2658)
Y2
OUT
BL
1
1
CUT ON-BOARD LINK R -O.
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE HP
2
2
FIELD PROVIDED JUMPER BETWEEN Y2 OUT BL ON
HEAT PUMP TO Y2 ON BCE4MS.
Y1-Y2
2-STAGE
COMPR
R-O
HEAT
PUMP
R-DS
DEHUM
OR
HARMONY
CUT FOR OPTIO
N
BCE7S
IMPORTANT — USE CARE WHEN CUTTING
ON-BOARD LINKS TO PREVENT DAMAGE TO
CONTROL. SEE FIGURE 19, BCE7S JUMPER AND
LINK GUIDE, FOR FURTHER DETAILS.
COMFORT SYNC™
Figure 16. Control (Field Wiring) – Heat Pump (Non-Communicating)
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
Electrostatic discharge can affect electronic components. Take care during unit installation and service to protect the
unit’s electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the unit,
the control and the technician at the same electrostatic potential. Touch hand and all tools on an unpainted unit surface
before performing any service procedure to neutralize electrostatic charge.
WARNING
