64
18-CE12D1-1D-EN
TWINNING CONNECTION DIAGRAM
FOR TWINNING S-SERIES FURNACES
2 STAGE HEAT / 1 STAGE COOLING
(WITH TRANSFORMER) THERMOSTAT
2 STAGE HEATING
1 STAGE COOLING
THERMOSTAT
FURNACE NO. 1
FURNACE NO. 2
R2
R2
ISOLATION RELAY
(FIELD SUPPLIED)
ISOLATION RELAY
R1
R1
Y1
B
Y1
Y1
Y1
W1
W1
W1
W2
W2
W2
R
R
R
G
G
G
B
B
B
NOTES:
1. BOTH FURNACES MUST BE POWERED FROM
THE SAME 115 VAC PHASE LEG AT THE CIRCUIT BREAKER.
2. TRANSFORMERS MUST BE IN PHASE.
- MEASURE THE VOLTAGE BETWEEN THE “R” TERMINALS
ON BOTH FURNACES, VOLTAGE SHOULD BE LESS THAN
10 VOLTS.
- IF GREATER, REVERSE THE LOW VOLTAGE ON ONE OF THE
TRANSFORMERS AND RECHECK.
3. HEATING AND COOLING AIRFLOW MUST BE THE SAME FOR
BOTH FURNACES.
4. OD UNIT TYPE SETUP MUST BE SET FOR 1-1.
5. WHEN TWINNING THE S9X1 OR S9B1 FURNACES, DISREGARD THE
W2 AND R2 WIRING.
From Dwg. 21B341337 Rev. 2
OUTDOOR UNIT
(WITH TRANSFORMER)
R
C
ISOLATION RELAY
(FIELD SUPPLIED)
ALTERNATE CONNECTION
TWINNING CONNECTION DIAGRAM
FOR TWINNING S-SERIES FURNACES
2 STAGE HEAT / 2 STAGE COOLING THERMOSTAT
2 STAGE HEATING
1 STAGE COOLING
THERMOSTAT
FURNACE NO. 1
FURNACE NO. 2
R2
R2
ISOLATION RELAY
(FIELD SUPPLIED)
ISOLATION RELAY
R1
R1
2 STAGE ODU
(NO TRANSFORMER)
Y2
Y1
Y1
Y1
Y1
B
Y2
Y2
Y2
W1
W1
W1
W2
W2
W2
R
R
R
G
G
G
B
B
B
NOTES:
1. BOTH FURNACES MUST BE POWERED FROM
THE SAME 115 VAC PHASE LEG AT THE CIRCUIT BREAKER.
2. TRANSFORMERS MUST BE IN PHASE.
- MEASURE THE VOLTAGE BETWEEN THE “R” TERMINALS
ON BOTH FURNACES, VOLTAGE SHOULD BE LESS THAN
10 VOLTS.
- IF GREATER, REVERSE THE LOW VOLTAGE ON ONE OF THE
TRANSFORMERS AND RECHECK.
3. HEATING AND COOLING AIRFLOW MUST BE THE SAME FOR
BOTH FURNACES.
4. OD UNIT TYPE SETUP MUST BE THE SAME FOR BOTH FURNACES.
5. WHEN TWINNING THE S9X1 OR S9B1 FURNACES, DISREGARD THE
W2 AND R2 WIRING.
