32
Twinning
Twinning operation of two furnaces, installed side-by-side, con-
nected 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 1194-250 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
1194-250 CONTROL BOARD
(62-104058-02)
1. Single Stage Operation
a. Control board “ONE” is on furnace connected to the ther-
mostat.
b. The 24 VAC supply to both control boards must be in
phase with each other.
c. Connect the “C,” “W” and “TWIN” terminals to counter-
parts on each control.
d. Twinning is automatically detected when wire is con-
nected to the twin terminal on both controls. If twinning
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 28 for twinning wire diagram for 1-stage thermostat.
See Figure 29 for twinning wire diagram for 2-stage thermostat.
TWINNING
FURNACE TWINNING INSTALLATIONS
To Next Page
Loading...
Need help?
General
