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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
1095-300 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.
32
UT ELECTRONIC CONTROLS
1095-300 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," "W", "W2" and "TWIN" terminals 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.
See Figure 27 for twinning wire diagram for 1-stage
thermostat.
See Figure 28 for twinning wire diagram for 1-stage
thermostat and times staging.
Ž
See Figure 29 for twinning wire diagram for a 2-stage
thermostat.
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