Bryant 355MAV C Series Installation, Start-Up, And Operating Instructions Manual Download Page 33

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CAUTION:

These furnaces are equipped with a manual

reset limit switch in burner box. This switch opens if an
overheat condition (rollout) occurs in burner enclosure.
Correct inadequate combustion-air supply or improper
venting condition and reset switch. DO NOT jumper this
switch.

Before operating furnace, check each manual reset switch for
continuity. If necessary, press button to reset switch.

II.

SELECT SETUP SWITCH POSITIONS

Air Conditioning (A/C) Setup Switches

The air conditioning setup switches are used to match furnace
airflow to the cooling unit used. This furnace will provide 400
CFM per selected air conditioning tonnage.

To set the desired cooling airflow:

1. Remove main furnace door and blower access panel.

2. Locate the A/C setup switches on the control center. (See

Fig. 25.)

3. Determine the air conditioning tonnage used.

4. Use Table 7 or wiring schematic to determine the proper

setup position of A/C switches. (See Fig. 23 and 43.)

NOTE:

Excessive airflow caused by improper A/C switch setup

may cause condensate blow off in the cooling mode.

5. Replace main furnace door and blower access panel.

NOTE:

EAC-1 terminal is energized whenever the blower oper-

ates. HUM terminal is only energized when the gas valve is
energized.

Continuous Fan (CF) Setup Switches

The CF setup switches are used to select desired airflow when the
thermostat is in the continuous fan mode. This setup feature will
allow the continuous fan airflow to be adjusted. To set the desired
continuous fan airflow:

1. Remove main furnace door and blower access panel.

2. Locate the CF setup switches on the control center. (See

Fig. 25.)

3. Determine the desired continuous fan airflow.

4. Use Table 8 or wiring schematic to determine the proper

setup position of CF switches. (See Fig. 23 and 43.)

NOTE:

The CF switches are factory set to provide the continuous

fan airflow equal to the low-heat mode.

5. Replace main furnace door and blower access panel.

Setup Switches (SW)

The control center has 8 setup switches that may be set to meet the
application requirements. Position these setup switches for the
appropriate requirement.

1. Remove main furnace door and blower access panel.

2. Locate setup switches on the control center. (See Fig. 25.)

3. See Table 9 for setup switch description. (See Fig. 23 and

43.)

4. Replace main furnace door and blower access panel.

NOTE:

If a bypass humidifier is used, setup switch SW-3 (BPH)

should be in ON position. This prevents nuisance limit trips caused
by the increased temperature in the return air resulting from the
bypass.

NOTE:

If modulating dampers are used, setup switch SW-5 (MZ)

should be in ON position. This allows the furnace control center to
compensate for the modulating dampers. The control will re-
calibrate for the new system static conditions once every minute
while operating in the low-heat or continuous fan modes.

III.

PRIME CONDENSATE TRAP WITH WATER

CAUTION:

Condensate trap must be PRIMED or

proper draining may not occur. The condensate trap has 2
internal chambers which can ONLY be primed by pour-
ing water into the inducer drain side of condensate trap.

1. Remove upper inducer housing drain connection cap. (See

Fig. 44.)

2. Connect field-supplied 1/2-in. ID tube to upper inducer

housing drain connection.

3. Insert field-supplied funnel into tube.

4. Pour 1 quart of water into funnel/tube. Water should run

through inducer housing, overfill condensate trap, and flow
into open field drain. (See Fig. 45.)

5. Remove funnel and tube from inducer housing and replace

drain connection cap and clamp.

IV.

PURGE GAS LINES

If not previously done, purge the lines after all connections have
been made and check for leaks.