36
the proper connection, refer to the
appropriate wiring diagram located on
the inside cover of the furnace control
box and in these instructions.
NOTE: UPFLOW MODELS ONLY
The electrical junction box may be
moved to the right side if necessary.
A knockout is provided. Seal the
opposite hole with plug provided.
NOTE: L1 (hot) and L2 (neutral)
polarity must be observed when
making field connections to the
furnace. The ignition control may
not sense flame if L1 and L2 are
reversed. See Figure 43.
Make all electrical connections in
accordance with the latest edition of
the National Electrical Code
ANSI/NFPA70 – or in Canada, the
Canadian Electrical Code Part 1-CSA
Standard C22.1 and local codes
having jurisdiction.
These may be obtained from:
National Fire Protection
Association, Inc.
Batterymarch Park
Quincy, MA 02269
Canadian Standards Association
178 Rexdale Boulevard
Rexdale, Ontario, Canada M9W 1R3
THERMOSTAT
The room thermostat must be com-
patible with the integrated furnace
control on the furnace. All thermostats
available from the furnace
manufacturer’s Parts Department are
acceptable. Generally, all thermostats
that are not of the “current robbing”
type are compatible with the
integrated furnace control. The low
voltage wiring should be sized as
shown in Table 5.
FIGURE 44
ISOLATION RELAY
TABLE 5
LOW VOLTAGE WIRING
SOLID COPPER WIRE - AWG
3.0
16
14
12
10
10
10
2.5
16
14
12
12
10
10
2.0
18
16
14
12
12
10
50
100
150
200
250
300
LENGTH OF RUN - FEET
➀
➀ ➤
The total wire length is the distance from
the furnace to the thermostat and back to the
furnace.
NOTE: Do not use 24 volt control wiring smaller
than No. 18.
THERMOSTAT
LOAD - AMPS
FIGURE 43
LINE VOLTAGE CONNECTIONS
HONEYWELL S9201E2001 AND UTEC 1012-920 & 1028-927 CONTROL
BOARDS
UTEC 1012-925 CONTROL BOARD
JOHNSON CONTROLS G961DAJ-2401 CONTROL BOARD
FURNACE
CONTROL
BOARD
T
O
THERMOST
A
T
“W”
TERMINAL
T
O
THERMOST
A
T
“R”
TERMINAL
Y
G
R
W
C
TWIN
NOTE: Do not use 24 volt control
wiring smaller than No. 18 AWG.
NOTICE: An isolation relay can be
added to prevent any compatibility
problems that may occur. Use a
single-pole, single-throw relay with a
24-volt AC coil. The contacts should
be rated for .5 amps minimum at 24
volts. See Figure 44.
Install the room thermostat in
accordance with the instruction sheet
packed in the box with the
thermostat.
Run the thermostat lead wires inside
the blower compartment and connect
to low voltage terminals 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 or
ducts, lighting fixtures, radiation from
fireplace, sun rays, lamps, televisions,
radios or air streams from registers.
Refer to instructions packed with the
thermostat for “heater” selection or
adjustment.
I334
I677
Summary of Contents for RGRA SERIES
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