Installation Manual

38 440 01 4900 00
Specifications subject to change without notice.
installation instructions for specific information about configuring
the thermostat. See Fig. 37 and 38.
Accessories (See Fig. 35 and 37.)
1. Electronic Air Cleaner (EAC)
Connect an accessory Electronic Air Cleaner (if used) using
1/4-- in. female quick connect terminals to the two male
1/4-- in. quick-- connect terminals on the control board
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. 35.
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. 37.
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.
Table 1 1 – Electrical Data
FURNACE SIZE
V O LT S ---
H E R T Z ---
PHASE
OPERATING VOLTAGE
RANGE*
MAXIMUM
UNIT
AMPS
UNIT
AMPACITY#
MINIMUM
WIRE
SIZE
AWG
MAXIMUM
WIRE
LENGTH
FT (M)}
MAXIMUM
FUSE OR CKT
BKR
AMPS{
Maximum* Minimum*
0601714 1 1 5 --- 6 0 --- 1 127 104 9.3 12.6 14 29 (9) 15
0801714 1 1 5 --- 6 0 --- 1 127 104 9.3 12.6 14 29 (9) 15
0802120 1 1 5 --- 6 0 --- 1 127 104 13.6 17.9 12 32 (9.7) 20
1002122 1 1 5 --- 6 0 --- 1 127 104 13.7 18 12 31 (9.7) 20
1202422 1 1 5 --- 6 0 --- 1 127 104 13.7 18 12 31 (9.7) 20
* 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, humidi fier,
etc.) full l oad 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.
24 V
Coil
To Humidifier Leads
To Com/24V Screw Terminal
on Thermostat Strip
To HUM Terminal On
Furnace Control Board
To Humidifier Leads
A11157
Fig. 35 -- Field-- supplied Isolation Relay for Humidifiers with Internal Power Supply