Bryant 395CAV User Manual
Page 9
V.
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 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.
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 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, control status indicator light will flash rapidly
and the furnace will not operate.
B.
24–V WIRING
Make field 24-v connections at the 24-v terminal strip. (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 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.
VI.
ACCESSORIES
1. Electronic Air Cleaner (EAC)
Two quick-connect terminals marked EAC-1 and EAC-2
are provided for EAC connection. (See Fig. 10.) These
terminals are energized with 115-v, (1.5-amp maximum)
during blower motor operation.
2. Humidifier (HUM)
A quick-connect terminal (HUM) and screw terminal (C
OM
)
are provided for 24-v humidifier connection. (See Fig. 11.)
HUM terminal is energized with 24-v (0.5-amp maximum)
after pressure switch closes.
WARNING:
DO NOT connect furnace control HUM
terminal to HUM (humidifier) terminal on Thermidis-
tat™, Zone Controller or similar device. See Thermidis-
tat, Zone Controller, thermostat, or controller manufac-
turer’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 blower operation.
VII.
VENTING
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-
struction (Single-Stage Vent Tables for Category I Fan-Assisted
Furnaces) for a quick, easy reference.
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.
START-UP PROCEDURES
I.
GENERAL
NOTE:
Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control status indicator light will flash rapidly
and furnace will not operate.
TABLE 5—ELECTRICAL DATA
UNIT
SIZE
VOLTS—
HERTZ—
PHASE
OPERATING
VOLTAGE RANGE
MAXIMUM
UNIT
AMPS
MINIMUM
WIRE
GAGE
MAXIMUM
WIRE LENGTH (FT)‡
MAXIMUM
FUSE OR CKT BKR
AMPS†
Maximum*
Minimum*
045-08
115–60–1
127
104
6.0
14
47
15
045-12
115–60–1
127
104
8.3
14
34
15
070-08
115–60–1
127
104
5.9
14
47
15
070-12
115–60–1
127
104
8.7
14
32
15
091-14
115–60–1
127
104
9.0
14
31
15
091-16
115–60–1
127
104
10.4
14
27
15
111-12
115–60–1
127
104
8.0
14
35
15
111-16
115–60–1
127
104
10.1
14
28
15
111-20
115–60–1
127
104
14.4
12
31
20
136-16
115–60–1
127
104
10.1
14
28
15
136-20
115–60–1
127
104
13.3
12
33
20
155-20
115–60–1
127
104
14.0
12
31
20
* Permissible limits of voltage range at which unit will operate satisfactorily.
† Time-delay type is recommended.
‡ Length shown is a measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.
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