Install sediment trap in riser leading to furnace. The trap can be
installed by connecting a tee to riser leading from furnace. Connect
capped nipple into lower end of tee. The capped nipple should
extend below level of gas controls. (See Fig. 9.)
After all connections have been made, purge lines and check for
gas leakage with regulated gas supply pressure.
Step 7—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 current
edition of the National Electrical Code (NEC) ANSI/NFPA
70-1999 and any local codes or ordinances that might apply. For
Canadian installations, all electrical connections must be made in
accordance with CSA C22.1 Canadian Electrical Code or authori-
ties having jurisdiction.
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.
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.
24-V WIRING
Refer to ESD Precautions Procedure before proceeding with 24-v
connections.
Make field 24-v connections at the 24-v terminal block. (See Fig.
10.) Connect terminal Y/Y2 as shown in Fig. 11 or 12 for proper
operation in cooling mode. Use AWG No. 18 color-coded, copper
thermostat wire only.
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. 10.) The terminals are
energized with 115v, 1-amp maximum during blower motor
operation.
2. Humidifier (HUM)
Screw terminals (HUM-1 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.
Do not connect furnace control HUM terminal to HUM
(humidifier) terminal on Thermidistat™, Zone Controller, or
similar device. See Thermidistat, Zone Controller, or thermo-
stat manufacturer’s instructions for proper connection. A
failure to follow this warning could result in fire.
Step 8—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 code such as NFGC in the United
States, or the NSCNGPIC in Canada, for proper vent sizing and
installation requirements.
Fig. 9—Typical Gas Pipe Arrangement
A89414
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE
(REQUIRED)
SEDIMENT
TRAP
UNION
Fig. 10—Furnace Control
A93348
123
456
78 9
PR2
L2
COM
PR1
L1
EAC-2
EAC-1
HI-COOL
HI-GAS
-HEAT
LO-GAS
-HEAT
PARK
3
FU1
SEC-1
SEC-2
1
123
456
7
8
9
10 11 12
MASTER SLAVE
TWIN
TEST
LED
GRY/Y2W/W1
COM
24 V
W2
1
ON
OFF
1234
FURNACE AND
BLOWER OFF DELAY
SETUP SWITCHES
24-VOLT
THERMOSTAT
TERMINALS
EAC - ELECTRONIC
AIR CLEANER
(115-VAC 1 AMP MAX)
3-AMP
FUSE
LED -
DIAGNOSTIC
LIGHT
TWIN / TEST
TERMINAL
HUM -
HUMIDIFIER
(24-VAC 0.5
AMP MAX)
HUM
9
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