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marked EAC- -1 and EAC- -2. The terminals are rated for
115VAC, 1.0 amps maximum and are energized during
blower motor operation.
2. Humidifier (HUM)
The HUM terminal is a 24 VAC output, energized when the blower
is operating during a call for heat.
Connect an accessory 24 VAC, 0.5 amp. maximum humidifier (if
used) to the ¼- -in. male quick- -connect HUM terminal and
COM- -24V screw terminal on the control board thermostat strip.
NOTE: If the humidifier has its own 24 VAC power supply, an
isolation relay may be required. Connect the 24 VAC coil of the
isolation relay to the HUM and COM/24V screw terminal on the
control board thermostat strip. See Fig. 36.
3. Communication Connector (communication connection)
This connection is used when the furnace is controlled by
an optional communicating User Interface instead of a stan-
dard thermostat. The communication plug is supplied with
the User Interface. Refer to the instructions supplied with
the User Interface for complete details. See Fig. 38.
VOLTS---
HERTZ---
PHASE
FURNACE SIZE
42060C17
115--- 60--- 1
42080C17
115--- 60--- 1
60080C21
115--- 60--- 1
66100C21
115--- 60--- 1
66120C24
115--- 60--- 1
* Permissible limits of the voltage range at which the unit operates satisfactorily.
# Unit ampacity = 125 percent of largest operating component's full load amps plus 100 percent of all other potential operating components' (EAC, humidifier,
etc.) full load amps.
Time ---delay type is recommended.
{
Length shown is as measured one way along wire path between furnace and service panel for maximum 2 percent voltage drop.
}
Fig. 36 - - Field- -supplied Isolation Relay for Humidifiers with Internal Power Supply
Table 11 – Electrical Data
OPERATING VOLTAGE
MAXIMUM
RANGE*
Maximum*
Minimum*
AMPS
127
104
127
104
127
104
127
104
127
104
To Humidifier Leads
To Humidifier Leads
4. Outside Air Thermistor (OAT)
The OAT connection is used in conjunction with communi-
cating User Interface. It is not required when the furnace is
controlled by a standard type thermostat. Refer to the in-
structions supplied with the User Interface for complete de-
tails.
Alternate Power Supplies
This furnace is designed to operate on utility generated power
which has a smooth sinusoidal waveform. If the furnace is to be
operated on a generator or other alternate power supply, the
alternate power supply must produce a smooth sinusoidal
waveform for compatibility with the furnace electronics. The
alternate power supply must generate the same voltage, phase, and
frequency (Hz) as shown in Table 11 or the furnace rating plate.
Power from an alternate power supply that is non-sinusoidal may
damage the furnace electronics or cause erratic operation.
Contact the alternate power supply manufacturer for specifications
and details.
UNIT
UNIT
AMPACITY#
9.3
12.6
9.3
12.6
13.6
17.9
13.7
18
13.7
18
To HUM Terminal On
Furnace Control Board
24 V
Coil
To Com/24V Screw Terminal
on Thermostat Strip
38
MINIMUM
MAXIMUM
MAXIMUM
WIRE
WIRE
FUSE OR CKT
SIZE
LENGTH
AWG
FT (M)}
14
29 (9)
14
29 (9)
12
32 (9.7)
12
31 (9.7)
12
31 (9.7)
BKR
AMPS{
15
15
20
20
20
A11157
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