Do not connect aluminum wire between disconnect switch
and furnace. Use only copper wire.
Make all electrical connections in accordance with the National
Electrical Code (NEC) ANSI/NFPA 70-1999 and local codes or
ordinances that apply. For Canadian installations, all electrical
connections must be made in accordance with CSA C22.1 Cana-
dian Electrical Code, or authorities having jurisdiction.
The cabinet MUST have an uninterrupted or unbroken ground
according to NEC ANSI/NFPA 70-1999 and Canadian Elec-
trical Code, CSA C22.1 or local codes to minimize personal
injury if an electrical fault should occur. This may consist of
electrical wire or conduit approved for electrical ground when
installed in accordance with existing electrical codes. Do not
use gas piping as an electrical ground. Failure to follow this
warning could result in electrical shock, fire, or death.
The junction box can be moved to left-hand side of furnace when
a left-hand side power supply is desired. Remove 2 screws holding
the junction box. Mount junction box on left-hand side of furnace.
Holes have been provided in casing. When moved, tuck wiring
harness behind clip provided to keep extra wire lengths out of the
way.
NOTE:
Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, the furnace control status LED will flash
rapidly and prevent heating operation.
24-V WIRING
Refer to ESD Precautions Procedure before proceeding with 24-v
connections.
Make field 24-v connections at 24-v terminal block. (See Fig. 17.)
Connect terminal Y/Y2 as shown in Fig. 15 or 16 for proper
cooling operation. Use only AWG No. 18 or larger, color-coded
copper thermostat wire.
The 24-v circuit contains an automotive-type, 3-amp fuse located
on main control. Any 24-v electrical shorts during installation,
service, or maintenance could cause this fuse to blow. If fuse
replacement is required, use ONLY a 3-amp fuse. The control will
flash code 24 when fuse needs replacement.
ACCESSORIES
1. Electronic air cleaner (EAC)
A terminal block (EAC-1 and EAC-2 ) is provided for EAC
connection. (See Fig. 14.) The terminals are energized with
115v, 1-amp maximum during blower motor operation.
2. Humidifier (HUM)
Screw terminals (HUM and C
OM
) are provided for 24-v
humidifier connection. The terminals are energized with 24v,
0.5-amp maximum when the gas valve is energized.
Step 9—Venting
Refer to the enclosed Installation Instructions, (Vent Tables For 1-
and 2-Stage Category I Fan-Assisted Furnaces) for quick, easy
reference, and national or local installation code such as National
Fuel Gas Code NFPA 54-1999/ANSI Z223.1-1999 in the United
States, or the National Standard of Canada Natural and Propane
Installation Codes CAN/CGA- B149.1- and .2-M00 in Canada, for
proper vent sizing and installation requirements.
After fully assembling the vent connector to the furnace flue collar,
securely fasten the vent connector to the collar with 2 field-
supplied, corrosion-resistant, sheet metal screws located 180
degrees apart and midway up the collar.
The horizontal portion of the venting system shall maintain a
minimum of 1/4-in. upward slope per linear ft, and it shall be
rigidly supported every 5 ft or less with hangers or straps to ensure
that there will be no movement after installation.
START-UP, ADJUSTMENT AND SAFETY CHECK
Step 1—General
The furnace must have a 115-v power supply properly connected
and grounded. Correct polarity must be maintained to enable gas
heating operation.
The gas service pressure must not exceed 0.5 psig (14-in. wc), and
no less than 0.16 psig (4.5-in. wc).
This furnace can be installed with either a single-stage heating or
a 2-stage heating thermostat.
Thermostat wire connections at R and W/W1 are the minimum
required for gas heating operation. W2 must be connected for
2-stage heating thermostats. Y/Y2 and G are required to be
connected to furnace for cooling and heat pumps. G is required for
continuous fan. C
OM
24-v is required for some clock thermostats.
These connections must be made on the 24-v thermostat terminals
on the control. (See Fig. 17.) Y1 on 2-stage thermostat is required
for 2-stage cooling and 2-stage heat pump.
For single-stage thermostats, connect thermostat W to W/W1 at the
furnace control 24-v thermostat terminals. (See Fig. 15.) For
single-stage thermostats, the control will determine, based on
length of previous heating on and off cycles, when to operate in
low- and high-gas heat for optimum comfort. Setup switch-2
(SW-2) must be in the factory-shipped OFF position. See Fig. 18
and Tables 6 and 7 for setup switch information.
If a 2-stage heating thermostat is to be used, move SW-2 to the ON
position at the end of the furnace installation. This overrides the
built-in control process for selecting high- and low-gas heat and
allows the 2-stage thermostat to select gas heating modes. The W2
from the thermostat must be connected to W2 on the control
terminal block. (See Fig. 16.)
Table 5—Electrical Data
UNIT SIZE
VOLTS—
HERTZ—
PHASE
OPERATING
VOLTAGE RANGE
MAX
UNIT
AMPS
MIN
WIRE
GAGE
MAX WIRE
LENGTH (FT)‡
MAX FUSE OR
CKT BKR AMPS†
Max*
Min*
060-12
115—60—1
127
104
10.6
14
34
15
080-16
115—60—1
127
104
13.4
14
27
15
100-16
115—60—1
127
104
13.2
14
28
15
100-20
115—60—1
127
104
17.7
12
32
20
120-20
115—60—1
127
104
18.2
12
31
20
* Permissible limits of the voltage range at which the unit will operate satisfactorily.
† Time-delay fuse is recommended.
‡ Length shown is as measured along wire path between unit and service panel for maximum 2 percent voltage drop.
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