24-V Wiring; Accessories; Direct Venting; Removal Of Existing Furnaces From Common Vent Ystems - Bryant 350MAV Installation, Start-Up, And Operating Instructions Manual

VOLTS—
UNIT
HERTZ—
SIZE
PHASE
024040 115-60-1
036040 115-60-1
024060 115-60-1
036060 115-60-1
048060 115-60-1
036080 115-60-1
048080 115-60-1
060080 115-60-1
048100 115-60-1
060100 115-60-1
060120 115-60-1
060140 115-60-1
* Permissible limits of voltage range at which unit will operate satisfactorily.
† Unit ampacity = 125 percent of largest operating component's full load amps plus 100 percent of all other potential operating components' (EAC, humidifier, etc.) full load
amps.
‡ Length shown is a measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.
** Time-delay type is recommended.
CAUTION: If manual disconnect switch is to be
mounted on furnace, select a location where a drill or
fastener will not contact electrical or gas components.
B. 24–v Wiring
Make field 24-v thermostat connections at 24-v terminal block on
control center. For proper cooling operation, Y wire from thermo-
stat MUST be connected to Y terminal on control center, as shown
in Fig. 27. The 24-v terminal board is marked for easy connection
of field wiring. (See Fig. 30.) The 24-v circuit contains a 3-amp,
automotive-type fuse located on control center. (See Fig. 31.) Any
electrical shorts of 24-v wiring during installation, service, or
maintenance may cause fuse to blow. If fuse replacement is
required, use only a fuse of identical size (3 amp).
NOTE: Use AWG No. 18 color-coded copper thermostat wire
for lengths up to 100 ft. For wire lengths over 100 ft, use AWG No.
16 wire.
C. Accessories
1. Electronic Air Cleaner (EAC)
Two quick-connect terminals marked EAC-1 and EAC-2
are provided for EAC connection. (See Fig. 31.) 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
are provided for 24-v humidifier connection. (See Fig. 30.)
HUM terminal is energized with 24-v (0.5-amp maximum)
after inducer pressure switch closes.
NOTE: A field-supplied, 115-v controlled relay connected to
EAC terminals may be added if humidifier operation is desired
during blower operation.
IX. DIRECT VENTING
The 350MAV Furnaces require a dedicated (one 350MAV furnace
only) direct-vent system. In a direct-vent system, all air for
combustion is taken directly from outside atmosphere, and all flue
products are discharged to outside atmosphere.
A. Removal of Existing Furnaces from Common Vent
Systems
If furnace being replaced was connected to a common vent system
with other appliances, the following steps shall be followed with
each appliance connected to the venting system placed in opera-
tion, while any other appliances connected to the venting system
are not in operation:
TABLE 4—ELECTRICAL DATA
OPERATING
MAX
VOLTAGE RANGE
UNIT
AMPS
Max* Min*
127 104 6.1
127 104 7.3
127 104 6.1
127 104 7.1
127 104 9.5
127 104 7.6
127 104 10.0
127 104 14.1
127 104 10.2
127 104 14.8
127 104 14.6
127 104 14.3
)
OM
UNIT
WIRE
AMPACITY†
SIZE
8.4
10.0
8.4
9.8
12.8
10.4
13.4
18.4
13.5
19.3
19.1
18.8
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal
pitch as required in the National Fuel Gas Code, ANSI
Z223.1 or 24 CAN/CGA B149 Installation Codes and these
instructions. Determine that there is no blockage or restric-
tion, leakage, corrosion, and other deficiencies which could
cause an unsafe condition.
3. In so far as is practical, close all building doors and
windows and all doors between the space in which the
appliance(s) connected to the venting system are located
and other spaces of the building. Turn on clothes dryers and
any appliance not connected to the venting system. Turn on
any exhaust fans, such as range hoods and bathroom
exhausts, so they shall operate at maximum speed. Do not
operate a summer exhaust fan. Close fireplace dampers.
4. Follow the lighting instructions. Place the appliance being
inspected in operation. Adjust thermostat so appliance shall
operate continuously.
5. Test for draft hood equipped appliance spillage at the draft
hood relief opening after 5 minutes of main burner opera-
tion. Use the flame of a match or candle.
6. After it has been determined that each appliance connected
to the venting system properly vents when tested as outlined
above, return doors, windows, exhaust fans, fireplace damp-
ers, and any other gas-burning appliance to their previous
conditions of use.
7. If improper venting is observed during any of above tests,
the venting system must be corrected.
Vent system or vent connectors may need to be resized. For any
other appliances when resizing vent systems or vent connectors,
system or connector must be sized to approach minimum size as
determined using appropriate table found in the NFGC or NSC-
NGPIC.
B. Combustion-Air and Vent Piping
GENERAL
→
Combustion-air and vent pipe, fittings, primers, and solvents must
conform to American Standards Institute (ANSI) standards and
American Society for Testing and Materials (ASTM) standards.
See Table 5 for approved materials for use in the U.S.A. and
Canada. In Canada construct all combustion-air and vent pipes for
this unit of CSA or ULC certified schedule-40 PVC, PVC-DWV or
ABS-DWV pipe and pipe cement. SDR pipe is NOT approved in
Canada.
—20—
MIN MAX WIRE
LENGTH OR CKT BKR
(FT)‡
14 44
14 37
14 44
14 38
14 29
14 36
14 28
12 31
14 27
12 30
12 30
12 30
MAX FUSE
AMPS**
15
15
15
15
15
15
15
20
15
20
20
20