Electrical Connections; 115-V Wiring; Accessories; Venting - Bryant 393AAV Installation, Start-Up, And Operating Instructions Manual

the ground joint union be loosened before pressure testing. If a
subsequent test pressure exceeds 0.5 psig (14-in. wc), the gas
supply pipe must be disconnected from the furnace and capped
before the pressure test. If a subsequent test pressure is equal to or
less than 0.5 psig (14-in. wc), turn off electric shutoff switch
located on the gas valve before the test. After all connections have
been made, purge the lines and check for leakage with regulated
gas supply pressure.
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE
(REQUIRED)
SEDIMENT
TRAP
UNION
Fig. 8—Typical Gas Pipe Arrangement
VIII. ELECTRICAL CONNECTIONS
A. 115-v Wiring
Refer to the unit rating plate or Table 5 for equipment electrical
requirements. The control system requires an earth ground for
proper operation.
CAUTION: 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 in the U.S.A. and
local codes or ordinances that might apply or authorities having
jurisdiction. For Canadian installations, all electrical connections
must be made in accordance with CSA C22.1 Canadian Electrical
Code, or authorities having jurisdiction.
WARNING: The cabinet MUST have an uninterrupted
or unbroken ground according to NEC, ANSI/NFPA
70-1999 and Canadian Electrical 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 auxiliary junction box (J-box) can be moved to the left-hand
side of the furnace when a left-side power supply is desired.
Remove the 2 screws holding the auxiliary J-box. Mount the J-box
on the left-hand side of the furnace (holes have been pre-drilled in
casing). When moved, tuck the wiring harness behind the 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 code indicator light
will flash rapidly and the furnace will not operate.
B. 24-v Wiring
Make field 24-v connections at the 24-v furnace thermostat
terminals. (See Fig. 10.) Connect terminal Y as shown in Fig. 9 for
proper cooling operation. Use only AWG No. 18, color-coded,
copper thermostat wire.
The 24-v circuit contains an automotive-type, 3-amp fuse located
on the furnace control. 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.
C. Accessories
1. Electronic Air Cleaner (EAC)
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Two spring clamp terminals (for 12 gage maximum, solid
or stranded wire), marked EAC-1 and EAC-2 are provided
for EAC connection. (See Fig. 10.) These terminals are
energized with 115-v, (1.0-amp maximum) during blower
motor operation. To connect EAC power leads to furnace
control, strip approximately 1/8 in. of insulation from wire.
Open terminal by depressing switch arm with a screwdriver
or finger, and insert wire as shown in Fig. 11.
2. Humidifier (HUM)
Screw terminals (HUM and C
24-v humidifier connection. The terminals are energized
with 24v (0.5-amp maximum) during burner operation.
WARNING: DO NOT connect furnace control HUM
terminal
Thermidistat™, Zone Controller, or similar device. See
A89417
Thermidistat, Zone Controller, thermostat, or controller
manufacturer's instructions for proper connection. A
failure to follow this warning could result in fire.
NOTE: A field-supplied, 115-v controlled relay connected to
EAC terminals may be added if humidifier operation is desired
during all blower operation.
IX.

VENTING

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Refer to the national or local installation code such as NFGC in the
United States, or the NSCNGPIC in Canada for proper vent sizing
and installation requirements. Use the enclosed Installation In-
structions (Single-Stage Vent Tables for Category I Fan-Assisted
Furnaces) for a quick, easy reference.
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After fully assembling the vent connector to the furnace flue collar,
securely fasten the vent connector to the collar with two field-
supplied, corrosion-resistant, sheet metal screws located 180° 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.
X. START-UP, ADJUSTMENT, AND SAFETY CHECK
A. General
NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, the furnace control status indicator light will
flash rapidly and furnace will not operate.
The furnace must have a 115-v power supply properly connected
and grounded. Proper polarity must be maintained for correct
operation. Thermostat wire connections at R, W, C
must be made at the 24-v terminal block on the control board. The
gas service pressure must not exceed 0.5 psig (14-in. wc), but must
be no less than 0.16 psig (4.5-in. wc).
—8—
-24V) are provided for
OM
to HUM (humidifier) terminal on
-24V, and Y
OM