0.5 psig (14-in. wc), close the manual shut-off valve located on the
gas valve before the test. It is recommended that the ground joint
union be loosened before pressure testing.
After all connections have been made, purge the lines and check
for gas leakage with regulated gas supply pressure.
Step 8—Electrical Connections
115-V WIRING
Refer to the unit rating plate or Table 6 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
70-1993, and any local codes or ordinances that might apply. For
Canadian installations, all electrical connections must be made in
accordance with Canadian Electrical Code CSA C22.1, or authori-
ties having jurisdiction.
NOTE:
Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control center fault code indicator light will
flash rapidly and furnace will not operate.
The cabinet MUST have an uninterrupted or unbroken ground
according to NEC ANSI/NFPA 70-1990 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.
24-V WIRING — Make field 24-v connections at the 24-v termi-
nal strip. (See Fig. 11.) Connect terminal Y as shown in Fig. 12 for
proper operation in cooling mode. Use AWG No. 18 color-coded
wire only.
The 24-v circuit contains an automotive-type, 3-amp fuse located
on the main control board. Any direct shorts during installation,
service, or maintenance could cause this fuse to blow. If fuse
replacement is required, use ONLY a 3-amp fuse of identical size.
ACCESSORIES
1. Electronic air cleaner (EAC)
Two quick-connect terminals, marked EAC-1 and EAC-2, are
provided for EAC connection. (See Fig. 11.) These terminals
are energized with 115v (1.5-amp maximum) during blower
motor operation.
2. Humidifier (HUM)
Quick-connect terminal (HUM) and screw terminal (Com) are
provided for 24-v humidifier connection. The terminals are
energized with 24v (0.5-amp maximum) after inducer motor
prepurge period.
NOTE:
A field-supplied, 115-v controlled relay connected to
EAC terminals may be added if humidifier operation is desired
during blower operation.
Step 9—Venting
Refer to the enclosed Installation Instructions, GAMA Venting
Tables for Category I Furnaces and Venting Tables for Category I
Fan-Assisted Furnaces. 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.
Fig. 10—Typical Gas Pipe Arrangement
A89414
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE
SEDIMENT
TRAP
UNION
Table 6—Electrical Data
UNIT SIZE
VOLTS—
HERTZ—
PHASE
OPERATING VOLTAGE RANGE
MAXIMUM
UNIT AMPS
MINIMUM
WIRE GAGE
MAXIMUM WIRE
LENGTH FT‡
MAXIMUM
FUSE OR HACR-
TYPE CKT BKR
AMPS†
Maximum*
Minimum*
050-08
115—60—1
127
104
6.6
14
42
15
050-12
115—60—1
127
104
8.1
14
34
15
070-08
115—60—1
127
104
6.7
14
42
15
070-12
115—60—1
127
104
8.4
14
33
15
096-12
115—60—1
127
104
9.2
14
30
15
096-16
115—60—1
127
104
10.2
14
28
15
115-16
115—60—1
127
104
10.1
14
28
15
115-20
115—60—1
127
104
13.3
12
33
20
135-20
115—60—1
127
104
14.3
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 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.
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