Accessories - Rheem GPH series Installation Instructions Manual

FIGURE 16
LINE VOLTAGE CONNECTIONS
UT ELECTRONIC CONTROLS 1028-928 CONTROL BOARDS
UT ELECTRONIC CONTROLS 1012-925 CONTROL BOARD
FIELD INSTALLED OPTION

ACCESSORIES

ELECTRONIC AIR CLEANER
1. Electronic air cleaner line voltage
power can be supplied from the
screw terminal "EAC" and a line
voltage neutral screw terminal on
the control board. See Figure 16.
NOTE: For (-)GPJ and (-)GLJ units
spade terms only are provided for
E.A.C. and humidifier. This will power
the electronic air cleaner whenever the
circulating air blower is in operation.
HUMIDIFIER
((-)GPH & (-)GLH MODELS ONLY)
2. Humidifier line voltage power can be
supplied from screw terminal "HUM"
to a line voltage neutral screw
terminal on the control board. See
Figure 16. This will power the
humidifier whenever the inducer is
operating in the heating mode.
NOTE: (-)GPJ and (-)GLJ models do
not have an output for a humidifier.
NOTE: Maximum current –1.0 amps
for each option.
FURNACE TWINNING
INSTALLATIONS
IMPORTANT: TWINNING OF (-)GPJ,
AND (-)GLJ UNITS REQUIRES AN
ACCESSORY TWINNING KIT. REFER
TO THE FURNACE SPECIFICATION
SHEET FOR PROPER KIT. DO NOT
ATTEMPT TO TWIN THESE MODELS
BY USING THE INSTRUCTIONS
BELOW.
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.
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 1028-928 integrated
control boards.
The "OK" LED will flash if twinning is
not set up properly.
UT ELECTRONIC CONTROLS
1028-928 CONTROL BOARD
1. Single Stage Operation
(See Figure 17)
a. Control board "ONE" is on
furnace connected to the
thermostat.
b. The 24 VAC supply to both
control boards must be in phase
I677
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 18)
a. Follow above instructions.
Connect "W2" on thermostat to
"W" on control board "TWO".
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