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18-BC90D1-4A-EN
11.2 Low Voltage Hook-up Diagrams (cont.)
With TEM 6/8
Thermostat
Air Handler
Outdoor
Unit
R
G
B
W1
W2
R
B
O
X2
R
G
B/C
B/C
O
Y1
W
Blue
24 VAC HOT
FAN
24 VAC
Common
SOV
COOL/HEAT
1st STAGE
HEATING
2nd STAGE
EMERGENCY
HEAT
Pink
Black
White
X2
O
Y1
Y2
Y1
Y2
COOL/HEAT
2nd STAGE
Y2
With TAM 7/9
Thermostat
Air Handler
Outdoor
Unit
R
G
B
W1
W2
R
B
O
Y
O
Y
O
X2
R
G
O
Y
l
W
Blue
O
Y2
Y
l
24 VAC HOT
FAN
24 VAC
Common
SOV
COOL/HEAT
1st STAGE
Y2
Y2
COOL/HEAT
2nd STAGE
HEATING
2nd STAGE
EMERGENCY
HEAT
Pink
Black
White
X2
•
Units with pigtails require wirenuts for connections.
•
In systems with multiple stages of electric heat, jumper W1 and W2 together if comfort control has only one stage of heat.
** TEM6 only - When using a BK enabled comfort control, cut BK jumper and bypass Y1 and Y2 at the air handler. Connect BK from
comfort control to BK of the air handler
• TAM7 only - When using a BK enabled comfort control, cut BK jumper on the AFC and connect BK from comfort control to BK of
the air handler. T
AM7 DIP switches must be configured for “HP: 2-Stage/1 Compressor”.
Note: Refer to Indoor Unit Literature for proper configuration.
BK
WH/BLK
BK
WH/BLK
BK
WH/BLK
BK
WH/BLK
11.3 Defrost Control
Defrost controls have a selectable termination temperature. As shipped, defrost will terminate at 47°F. For a
higher termination temperature, cut Jumper J2 to achieve 70°F when at or below 30°F ambient. See Service
Facts shipped in the outdoor unit for more information.
Pin Identification
(See Illustration at right)
1. TEST_COMMON (Shorting any of the other pins to this pin causes the function of the other pin to be
executed. Leaving this pin open results in the normal mode of operation.)
2. TST = Test (Shorting TEST_COMMON to this pin speeds up all defrost board timings.)
3. FRC_DFT = Forced Defrost (Short TEST_COMMON to this pin for two (2) seconds to initiate a forced
defrost. Remove the short after defrost initiates.)
Defrost Control Checkout
Normal operation requires:
•
LED on board flashing 1 time/second.
•
24V AC between R & B.
•
24V AC between Y & B with unit operating.
•
Defrost initiation when FRC_DFT pin is shorted to TEST_COMMON pin.
If a defrost control problem is suspected, refer to the service information in control box.
