Page 24
506176−01 01/2010
INTERIOR MAKE−UP BOX INSTALLATION
MAKE−UP
BOX
Left side
FIGURE 22
Refer to figure 23 for schematic wiring diagram and trou-
bleshooting and table 10 and figure 24 for field wiring.
1 − The power supply wiring must meet Class I restric-
tions. Protected by either a fuse or circuit breaker, se-
lect circuit protection and wire size according to unit
nameplate.
NOTE − Unit nameplate states maximum current draw.
Maximum Over−Current Protection allowed is 20AMP.
2 − Holes are on both sides of the furnace cabinet to facili-
tate wiring.
3 − Install a separate (properly sized) disconnect switch
near the furnace so that power can be turned off for
servicing.
4 − Before connecting the thermostat or the power wiring,
check to make sure the wires will be long enough for
servicing at a later date. Remove the blower access
panel to check the length of the wire.
5 − Complete the wiring connections to the equipment.
Use the provided unit wiring diagram and the field wir-
ing diagrams shown in table 10 and figure 24. Use
18−gauge wire or larger that is suitable for Class II ra-
ting for thermostat connections.
6 − Electrically ground the unit according to local codes or,
in the absence of local codes, according to the current
National Electric Code (ANSI/NFPA No. 70) for the
USA and current Canadian Electric Code part 1 (CSA
standard C22.1) for Canada. A green ground wire is
provided in the field make−up box.
NOTE − The G60UH(X) furnace contains electronic
components that are polarity sensitive. Make sure
that the furnace is wired correctly and is properly
grounded.
7 − One line voltage HUM" 1/4" spade terminal is provided
on the furnace integrated control. Any humidifier rated
up to one amp can be connected to this terminal with
the neutral leg of the circuit being connected to one of
the provided neutral terminals. See figure 25 for control
configuration. This terminal is energized in the heating
mode when the combustion air inducer is operating.
8 − One line voltage EAC" 1/4" spade terminal is provided
on the furnace integrated control. Any electronic air
cleaner rated up to one amp can be connected to this
terminal with the neutral leg of the circuit being con-
nected to one of the provided neutral terminals. See
figure 25 for control configuration. This terminal is en-
ergized when the indoor blower is operating.
9 − One 24V H" terminal is provided on the furnace inte-
grated control terminal block. Any humidifier rated up
to 0.5 amp can be connected to this terminal with the
ground leg of the circuit being connected to either
ground or the C" terminal. See figure 25 for control
configuration.
10 −Install the room thermostat according to the instruc-
tions provided with the thermostat. See table 10 for
field wiring connections in varying applications. If the
furnace is being matched with a heat pump, refer to the
instruction packaged with the dual fuel thermostat.
Indoor Blower Speeds
1 − When the thermostat is set to FAN ON," the indoor
blower will run continuously on the low speed when
there is no cooling or heating demand.
2 − When the G60UH(X) is operating in the high−fire or
low−fire heating mode, the indoor blower will run on the
corresponding heating speed.
3 − When there is a cooling demand, the indoor blower will
run on the cooling speed.
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