Never purge a line into a combustion chamber. Never use
matches, candles, flame, or other sources of ignition for the
purpose of checking leakage. Use a soap-and-water solution
to check for leakage. A failure to follow this warning can
cause a fire, explosion, personal injury, or death.
Step 8—Electrical Connections
115-V WIRING
Refer to unit rating plate or Table 5 for equipment electrical
requirements. The control system requires an earth ground for
proper operation.
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 might apply. For Canadian installations, all elec-
trical connections must be made in accordance with CSA C22.1
Canadian 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.
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
junction box. Mount junction box on left-hand side of furnace. The
blower door interlock switch must also be moved to left-hand side
of furnace due to length of wiring harness. (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. 11.)
Connect terminal Y/Y2 as shown in Fig. 9 or 10 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 [hot] and EAC-2 [neutral]) is
provided for EAC connection. (See Fig. 11.) 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 54-1996/ANSI Z223.1-1996 in the United
States, or the National Standard of Canada Natural and Propane
Installation Codes CAN/CGA-B149.1- and .2-M95 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.
Step 10—Start-Up, Adjustment, and Safety Check
GENERAL
The furnace must have a 115-v power supply properly connected
and grounded. Correct polarity must be maintained to enable gas
heating operation.
Table 5—Electrical Data
UNIT SIZE
VOLTS—
HERTZ—
PHASE
OPERATING
VOLTAGE RANGE
MAX
UNIT
AMPS
MIN
WIRE
GAGE
MAX WIRE
LENGTH (FT)‡
MAXIMUM FUSE OR
CKT BKR AMPS†
Max*
Min*
040-12
115—60—1
127
104
11.4
14
32
15
060-08
115—60—1
127
104
8.2
14
45
15
060-12
115—60—1
127
104
10.6
14
34
15
080-12
115—60—1
127
104
11.7
14
31
15
080-16
115—60—1
127
104
13.4
14
27
15
100-12
115—60—1
127
104
10.5
14
35
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
120-16
115—60—1
127
104
13.2
14
28
15
120-20
115—60—1
127
104
18.2
12
31
20
135-20
115—60—1
127
104
17.4
12
33
20
* Permissible limits of the voltage range at which the unit will operate satisfactorily.
† Time-delay fuse is recommended.
‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.
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