American Standard Freedom 80 - Manual (Page 19)

12-1263-02 19
Twinning
Field Wiring
TWIN TWIN
TWINNING CONNECTION DIAGRAM
FOR TWINNING UD/DD-R FURNACES
1 STAGE HEAT / 1 STAGE COOLING THERMOSTAT
1 STAGE
HEATING / COOLING
THERMOSTAT FURNACE NO. 1 FURNACE NO. 2
BLOWER OPERATION OF
UNIT NO. 2 IS SYNCRONIZED
WITH UNIT NO. 1 VIA SIGNALS
FROM TWIN CONNECTION.
SEE NOTE 4
OUTDOOR UNIT NO. 1
(NO TRANSFORMER)
OUTDOOR UNIT NO. 1
(WITH TRANSFORMER)
SEE NOTE 3
RC
ISOLATION RELAY
(FIELD SUPPLIED)
ALTERNATE CONNECTION
R1
R1
SEE NOTE 5
ISOLATION RELAY
(FIELD SUPPLIED)
SEE NOTE 4
JUMPER W1 TO W2
ON BOTH UNITS.
2ND STAGE WILL FIRE
10 MINUTES AFTER 1ST.
B/C B/C B/C
From Dwg. 21B341487 Rev. 1
TWIN TWIN
TWINNING CONNECTION DIAGRAM
FOR TWINNING UD/DD-R FURNACES
2 STAGE HEAT / 1 STAGE COOLING THERMOSTAT
2 STAGE HEATING
1 STAGE COOLING
THERMOSTAT FURNACE NO. 1 FURNACE NO. 2
BLOWER OPERATION OF
UNIT NO. 2 IS SYNCRONIZED
WITH UNIT NO. 1 VIA SIGNALS
FROM TWIN CONNECTION.
SEE NOTE 4
OUTDOOR UNIT NO. 1
(NO TRANSFORMER)
OUTDOOR UNIT NO. 1
(WITH TRANSFORMER)
SEE NOTE 3
RC
ISOLATION RELAY
(FIELD SUPPLIED)
ALTERNATE CONNECTION
R2
R2
SEE NOTE 5
ISOLATION RELAY
(FIELD SUPPLIED)
SEE NOTE 4
ISOLATION RELAY
SEE NOTE 4
R1
R1
B/C B/C B/C
From Dwg. 21B341488 Rev. 1