Bryant 355MAV User Manual download pdf (Page 9)

The 24-v circuit contains an automotive-type, 3-amp fuse located

on the furnace control. (See Fig. 13.) Any direct shorts of the 24-v

wiring during installation, service, or maintenance will cause this

fuse to blow. If fuse replacement is required, use ONLY a fuse of

identical size. The furnace control LED will flash status code 24

when fuse needs to be replaced.

With power to the unit disconnected, check all electrical connec-

tions for tightness. Tighten all screws on electrical connections. If

any smoky or burned connections are found, disassemble the

connection, clean all parts, strip wire, and reassemble properly and

securely.

Reconnect electrical supply to unit and observe unit through 1

complete operating cycle and check for proper operation.

VIII. CHECKING HEAT TAPE OPERATION

(IF APPLICABLE)

In applications where the ambient temperature around the furnace

is 32°F or lower, freeze protection measures are required. If this

application is where heat tape has been applied, check to ensure it

will operate when low temperatures are present.

NOTE: Heat tape, when used, should be wrapped around the

condensate drain trap and drain line. There is no need to use heat

tape within the furnace casing. Most heat tapes are temperature

activated, and it is not practical to verify the actual heating of the

tape. Check the following:

1. Check for signs of physical damage to heat tape such as

nicks, cuts, abrasions, gnawing by animals, etc.

2. Check for discolored heat tape insulation. If any damage or

discolored insulation is evident, replace heat tape.

3. Check that heat tape power supply circuit is on.

CAUTION: UNIT AND PROPERTY DAMAGE

HAZARD

Failure to follow this caution may result in furnace

component failures or water property damage.

If this furnace is to be operated in an unconditioned space

where the ambient temperatures may be 32°F or lower,

freeze protection measures must be taken. See CONDEN-

SATE DRAIN PROTECTION section of Installation,

Start-up, and Operating Instructions. (See Fig. 14.)

IX. WINTERIZING

CAUTION: UNIT DAMAGE HAZARD

Failure to follow this caution may result in furnace

component damage.

Freezing condensate left in the furnace will damage the

furnace.

If the furnace will be off for an extended period of time in a

structure where the temperature will drop to 32°F or below,

winterize as follows:

1. Turn off electrical supply to furnace.

2. Remove main furnace door.

3. Disconnect upper inducer housing drain connection cap

from inducer housing. (See Fig. 15.)

4. Connect field-supplied 1/2-in. I.D. inducer housing tube to

upper inducer housing drain connection.

5. Insert funnel in tube and pour one quart of antifreeze,

propylene glycol (RV, swimming pool antifreeze, or

equivalent) into funnel/tube until it is visible at point where

condensate enters open drain. (See Fig. 16.)

Fig. 12—Field Wiring

A95236

115-VOLT FIELD-

SUPPLIED

FUSED

DISCONNECT

JUNCTION

BOX

CONTROL

BOX

24-VOLT

TERMINAL

BLOCK

THREE-WIRE

HEATING-

ONLY

FIVE

WIRE

NOTE 2

NOTE 1

1-STAGE

THERMOSTAT

TERMINALS

FIELD-SUPPLIED

FUSED DISCONNECT

CONDENSING

UNIT

FURNACE

COM

WCY RG

GND

FIELD 24-VOLT WIRING

FIELD 115-, 208/230-, 460-VOLT WIRING

FACTORY 24-VOLT WIRING

FACTORY 115-VOLT WIRING

Connect Y/Y2-terminal as shown for proper operation.

Some thermostats require a "C" terminal connection as shown.

If any of the original wire, as supplied, must be replaced, use

same type or equivalent wire.

208/230- OR

460-VOLT

THREE

PHASE

208/230-

VOLT

SINGLE

PHASE

WHT

BLK

WHT

BLK

W/W1

Y/Y2

NOTES: 1.

—9—

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Bryant 355MAV User Manual Page 9

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