Caution – Bryant 355CAV User Manual

Page 27

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) and type. The
furnace control will flash status code 24 when fuse needs

replacement.
NOTE: Use AWG No. 18 color--coded copper thermostat wire for
lengths up to 100 ft. (30.4M). For wire lengths over 100 ft.,
(30.4M) use AWG No. 16 wire.
NOTE: For additional thermostat connection diagrams, reference
Fig. 52--59.

Accessories

1. Electronic Air Cleaner (EAC)

The furnace control EAC terminals are energized with 115v
(1.0--amp maximum) during blower operation.

Connect an accessory Electronic Air Cleaner (if used) using
1/4--in. female quick connect terminals to the two male

1/4--in. quick--connect terminals on the control board
marked EAC--1 and EAC--2. The terminals are rated for
115VAC, 1.0 amps maximum and are energized during

blower motor operation. (See Fig. 33.)

NOTE: Low stage airflow may slightly increase the trace amount
of ozone created by an electronic air cleaner. Individual sensitivity
levels to ozone, along with other operating characteristics of
electronic air cleaners may affect the amount noticed by an
individual. Refer to the air cleaner manufacturer’s installation
instructions for more information regarding ozone and ozone
reduction methods available for your air cleaner.

UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit component

damage.
DO NOT connect furnace control HUM terminal to HUM

(humidifier) terminal on Thermidistatt, Zone Controller or

similar device. See Thermidistatt, Zone Controller,

thermostat, or controller manufacturer’s instructions for

proper connection.

CAUTION

2. Humidifier (HUM)

Connect an accessory 24 VAC, 0.5 amp maximum
humidifier (if used) to the 1/4--in. male quick--connect

HUM terminal and COM--24V screw terminal on the
control board thermostat strip. The HUM terminal is
energized when blower is energized in heating. (See Fig.

33.)

Removal of Existing Furnaces from Common Vent

Systems

When an existing Category I furnace is removed or replaced, the
original venting system may no longer be sized to properly vent

the remaining attached appliances. An improperly sized Category I
venting system could cause the formation of condensate in the

furnace and vent, leakage of condensate and combustion products,

spillage of combustion products into the living space, etc.

AIR FOR COMBUSTION AND VENTILATION

FURNACE RELIABILITY HAZARD
Failure to follow this caution may result in premature

component failure.
This furnace can be vented as either a direct vent (2--pipe)

furnace or as an optional ventilated combustion air

application. A direct vent system shall be installed in

accordance with the direct vent (2-- pipe) procedures in the

Combustion Air and Vent Pipe Systems section within this

supplemental

instruction.

For

optional

ventilated

combustion air applications, refer to the ventilated

combustion air option procedures in the same section.

Application of this furnace should be indoors with special

attention given to vent sizing and material, gas input rate,

air temperature rise, unit leveling, and unit sizing.

CAUTION

Combustion--Air and Vent Pipe Systems

For additional venting information contact www.Bryant.com.

General

Vent system or vent connectors of other appliances may need to be

re--sized. 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 CAN/CSA--B149.1--05.
The 355CAV furnaces can be vented as either a direct vent furnace

or as an optional ventilated combustion air application. A direct

vent system shall be installed in accordance with the direct vent
(2--pipe) procedures in the following Combustion Air and Vent

Pipe Systems section. For optional ventilated combustion air
applications, refer to the ventilated combustion air option

procedures in the same section. Common venting prohibited.

Direct Vent / 2--Pipe System

In a direct--vent (2--pipe) system, all air for combustion is taken
directly from outdoor atmosphere, and all flue products are

discharged to outdoor atmosphere. Combustion--air and vent pipes
must terminate together in the same atmospheric pressure zone,

either through the roof or a sidewall (roof termination preferred). A

factory accessory vent termination kit MUST be used in a direct
vent (2--pipe) system. See Fig. 34 for required clearances.

Ventilated Combustion Air Option Materials

In a ventilated combustion air option, the vent terminates and

discharges the flue products directly to the outdoors similar to a
direct vent system. See Fig. 35 for required clearances. All air for

combustion is piped directly to the furnace from a space that is well
ventilated with outdoor air (such as an attic or crawl space) and the

space is well isolated from the living space or garage.

Materials

Combustion--air and vent pipe, fittings, primers, and solvents must
conform to American National Standards Institute (ANSI)

standards and American Society for Testing and Materials (ASTM)
standards. See Table 5 for approved materials for use in the USA.

355C