Bryant 355MAV - Manual (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
R
W C Y R G
GND
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
W2
Y/Y2
G
NOTES: 1.
2.
3.
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