80
Twinning operation of two furnaces, installed side-by-side,
connected by a common duct system with main power
supplied by the same source, and controlled by a common
thermostat can be done with the UT Electronic Controls
1195-310 integrated control boards.
IMPORTANT:
Only twin furnaces with identical control
boards.
IMPORTANT:
Only bottom returns can be used. No more
than two furnaces can share the same supply and return.
Furnaces must have same heating and blower capacity.
Twinning furnaces must operate off the same phase of
power.
It should be noted that both blowers will run simultaneously
when there is a call for heating, cooling or fan.
NOTE:
Duct system must be adequate to provide correct
airflow to each furnace for supply and return.
UT ELECTRONIC CONTROLS 1095-
310 CONTROL BOARD
(62-104059-01)
1. Single Stage Operation
a. Control board “ONE” is on furnace connected to the
thermostat.
b. The 24 VAC supply to both control boards must be
in phase with each other.
c. Connect the “C,” “G,” “W,” “W2” and “TWIN” termi-
nals to counterparts on each control.
d. Twinning is automatically detected when wire is con-
nected to the twin terminal on both controls. If twin-
ning is detected and then lost in the same power
cycle, the furnace control will declare and display
fault code 20 at the seven-segment display.
➀
See Figure 44 for twinning wire diagram for 1-stage
thermostat.
➁
See Figure 45 for twinning wire diagram for 1-stage
thermostat and times staging.
➂
See Figure 46 for twinning wire diagram for a 2-stage
thermostat.
TWINNING
FURNACE TWINNING INSTALLATIONS
Twinning
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