Trane 8B1A026M2PSAB, Installer'S Manual, Page: 42 / 64

42 18-CE14D1-1A-EN
Twinning
TWINNING CONNECTION DIAGRAM
FOR TWINNING S-SERIES FURNACES
2 STAGE HEAT / 1 STAGE COOLING THERMOSTAT
2 STAGE HEATING
1 STAGE COOLING
THERMOSTAT FURNACE NO. 1 FURNACE NO. 2
R2
R2
ISOLATION RELAY
R1
R1
1 STAGE ODU
(NO TRANSFORMER)
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 THE SAME FOR BOTH FURNACES.
5. WHEN TWINNING THE S8B1 / S8X1 FURNACES, DISREGARD THE
W2 AND R2 WIRING.
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.
F Fu urrn na acce e G Ge en ne erra all IIn nsstta alllla attiio on n