Accessories; Furnace Twinning - Rheem GPT series Installation Instructions Manual

FIGURE 18
LINE VOLTAGE CONNECTIONS
UT ELECTRONIC CONTROLS 1028-930 CONTROL BOARD
FIELD INSTALLED OPTION

ACCESSORIES

Electronic air cleaner line voltage
ELECTRONIC AIR CLEANER
power can be supplied from the screw
terminal "EAC" and a line voltage
neutral screw terminal on the control
board. Power is on any time the blower
is activated. See Figure 18.
Humidifier line voltage power can be
HUMIDIFIER
supplied from screw terminal "HUM" to
a line voltage neutral screw terminal on
the control board. See Figure 18. This
will power the humidifier whenever the
inducer is operating in the heating
mode.
NOTE: Maximum current –1.0 amps
for each option.
Refer to specification sheet for
FOSSIL FUEL KIT
approved fossil fuel kit number.
RXGW-B01 CHIMNEY
ADAPTER
IMPORTANT: CHIMNEY ADAPTER IS
CERTIFIED FOR USE ON UPFLOW
ONLY.
This appliance is CSA certified for use
with RXGW-B01 Chimney Adapter.
Refer to Kit Installation Instructions
92-101682-01.
24

FURNACE TWINNING

INSTALLATIONS
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.
NOTE: Limit of two furnaces per
thermostat.
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 1028-930R2 integrated
control boards.
The "OK" LED will blink five times if
twinning is not set up properly.
UT ELECTRONIC CONTROLS
1. Single Stage Operation
1028-930R2 CONTROL BOARD
(See Figure 19)
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" and
"TWIN" terminals to
counterparts on each control.
d. Both control boards must have
switch #3 in the "ON" position.
2. Two Stage Operation
(See Figure 20)
a. Follow above instructions.
Connect "W2" on thermostat to
"W" on control board "TWO".