Accessories - Rheem RGRK SERIES Installation Instructions Manual

FIGURE 41
THERMOSTAT WIRING OPTIONS
2 HEAT - 1 COOL
2 HEAT - 2 COOL
THERMOSTAT
NOTE: Do not use 24 volt control wiring
smaller than No. 18 AWG. (Refer to
Table 9.)
See Figure 41 for thermostat wiring
options.
A single- or two-stage thermostat may be
used, however, a two-stage thermostat is
recommended for optimum performance.
The room thermostat must be compatible
with the integrated furnace control on the
furnace. Generally, all thermostats that
are not of the "current robbing" type are
compatible with the integrated furnace
control being used.
Install the room thermostat in accordance
with the instruction sheet in the box with
the thermostat. Run the thermostat lead
wires inside the control compartment.
Connect the thermostat as shown on the
wiring diagram. Never install the
thermostat on an outside wall or where it
will be influenced by drafts, concealed
hot or cold water pipes, lighting fixtures,
radiation from fireplace, rays of sun,
lamps, television, radios or air streams
from registers. Refer to the instructions
packed with the thermostat for best
anticipator adjustment or selection.
Locate the thermostat approximately five
feet up from the floor.
HEAT ANTICIPATOR SETTINGS
If a current reading taken at the
thermostat is not performed, an initial
setting of .15 amps is recommended.
(OPTION A) TIMED STAGING W/1
STAGE HEAT T-STAT (AFTER F3507
DATE CODE (AUGUST 2007)
(OPTION B) 100% HEAT ALWAYS -- NO TIMED STAGING
FIELD-INSTALLED OPTIONAL ACCESSORIES
Adjust as needed to improve comfort
level.
ISOLATION RELAY
IMPORTANT: NOT ALL ELECTRONIC
NIGHT SETBACK THERMOSTATS
ARE COMPATIBLE WITH THE
FURNACE CONTROL SYSTEM.
SOME MAY REQUIRE AN ISOLATION
RELAY.
If an isolation relay is needed, install it
as close to the control board as
possible. Use a single-pole, single-
throw relay with a 24 volt operating coil.
The relay contacts should be designed
for 24 volt loads.
Connect one end of the operating coil
to the thermostat "W" terminal.
Connect the other end of the coil to the
"C" terminal on the control board.
­ Connect a jumper from the coil
terminal connected to the thermostat to
one of the normally open relay
contacts.
­ Connect the other side of the
normally open relay contacts to the
control board "W" terminal if using a
two stage thermostat. Connect that one
side of the normally open relay
contacts to the control board "W2"
terminal if using a single stage
thermostat.
When the thermostat calls for heat, it
powers the 24 volt operating coil. This
1 HEAT, 1 COOL
1 HEAT, 1 COOL
closes the relay contacts and
conducts power from terminal 3 and 4
to terminal "W" on the control board
and starts the furnace ignition
sequence. See Figure 42.
­ NOTE: Use of an isolation relay
with the two stage furnace is not
normally needed.
ELECTRONIC AIR CLEANER
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. This will power the electronic
air cleaner whenever the circulating
air blower is in operation.
HUMIDIFIER
Line voltage power can be supplied
from screw terminal "HUM" to a line
voltage neutral screw terminal on the
control board. This will power the
humidifier during a normal heat
sequence after the blower has turned
on.
NOTE: Maximum current of 1.0 Amp
for each option.
ALTERNATE (LEFT SIDE)
DRAIN KIT - (-)XGY-H01
(DOWNFLOW MODELS
ONLY)
43