Trane UD1D140A9H51B, UD1D120A9H51B, UD1B060A9H31B manual Twinning, Stage Heating only Thermostat

Installer’s Guide

TWINNING

These furnaces may be twinned. Twinning requires that two furnaces with the same configuration, capacity, and airflow must be used. They shall have common returns with equal pressure drops or ducts with equivalent lengths and sizes. See Field Wiring Diagrams below for proper hookup.

	TWINNING CONNECTION DIAGRAM
	FOR TWINNING 1 STAGE FURNACES WITH
	SINGLE WIRE TWINNING FEATURE
1 STAGE HEAT	1 STAGE HEATING ONLY THERMOSTAT
ONLY
THERMOSTAT
(WITH FAN SWITCH)	FURNACE NO. 1	FURNACE NO. 2
		BLOWER OPERATION OF
		UNIT NO. 2 IS SYNCRONIZED
		WITH UNIT NO. 1 VIA SIGNALS
		FROM TWIN CONNECTION.
	TWIN	TWIN
		SEE NOTE 4
	ISOLATION RELAY
	(FIELD SUPPLIED)
	SEE NOTE 4
	R1	R1
		ISOLATION RELAY
		SEE NOTE 4
B/C	SEE NOTE 3	B/C
	B/C
		From Dwg. 21B341422 Rev. 3

			TWINNING CONNECTION DIAGRAM
		FOR TWINNING 1 STAGE FURNACES WITH
			SINGLE WIRE TWINNING FEATURE
	1 STAGE	1 STAGE HEAT / 1 STAGE COOL THERMOSTAT
OUTDOOR UNIT
	HEATING / COOLING
(WITH TRANSFORMER)
	THERMOSTAT		FURNACE NO. 1	FURNACE NO. 2
				BLOWER OPERATION OF
				UNIT NO. 2 IS SYNCRONIZED
				WITH UNIT NO. 1 VIA SIGNALS
				FROM TWIN CONNECTION.
			TWIN	TWIN
RC
ISOLATION RELAY
(FIELD SUPPLIED)
SEE NOTE 3
				SEE NOTE 4
OUTDOOR UNIT
(NO TRANSFORMER)
					R1
					ISOLATION RELAY
					SEE NOTE 4
		SEE NOTE 5	B/C	R1
	B/C			B/C
				ISOLATION RELAY
				(FIELD SUPPLIED)
				SEE NOTE 4	From Dwg. 21B341423 Rev. 2
18					18-CD21D1-5