American Standard Freedom 80 - Manual (Page 20)

20 12-1263-02
TWIN TWIN
TWINNING CONNECTION DIAGRAM
FOR TWINNING UD/DD-R FURNACES
2 STAGE HEAT / 2 STAGE COOLING THERMOSTAT
2 STAGE HEATING
2 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. 2
(NO TRANSFORMER)
SEE NOTE 3
R2
R2
SEE NOTE 5
ISOLATION RELAY
(FIELD SUPPLIED)
SEE NOTE 4
ISOLATION RELAY
SEE NOTE 4
R1
R1
OUTDOOR UNIT
(WITH TRANSFORMER)
SEE NOTE 3
RC
ISOLATION RELAY
(FIELD SUPPLIED)
ALTERNATE CONNECTION
B/C B/C B/C
From Dwg. 21B341489 Rev. 1
Twinning
Field Wiring