Bryant 564B User Manual

Page 14

HEATING OPERATION (SIZES 024-042)

With a call for heating (W2), the auziliary or electric heat
energizes along with the indoor blower. In case of staged heating,
W3 is energized if the demand is not met. The highest airflow
selected is run while the electric heat is in operation. When heating
demand is met, W3 and W2 sequentially de-energize shutting the
indoor fan and the electric heater.

HEATING OPERATION (SIZES 048 AND 060)

With a call for heating (W2), the auxiliary electric heater is
energized along with the indoor blower. If the demand is not met,
W3 is energized in case of staged heating. When heating demand
is satisfied, W3 and W2 sequentially de-energize along with the
indoor fan blower.

CONTINUOUS FAN

With the continuous Indoor fan option selected on the thermostat,
G is continuously energized. In case of 024-042 units, the selected
airflow setting is provided. In case of 048 and 060 units, the
system runs low stage (Y1) airflow for continuous fan operation.

DEFROST

Defrost board (DB) is a time and temperature control, which
includes a field-selectable time period between checks for defrost
(30, 60, 90 and 120 minutes). The time period is factory-set at 60
minutes and should only be adjusted by a trained service person.
Electronic timer and defrost cycle start only when contactor is
energized and defrost thermostat (DFT) is closed.

Defrost mode is identical to Cooling mode. The outdoor fan motor
stops because of “OF1” and “OF2” contacts opening on the defrost
board, a bank of optional electric heat turns on to warm air
supplying the conditioned space.

ELECTRIC RESISTANCE HEATING

If accessory electric heaters are installed, on a call for “Emergency
Heat” the thermostat energizes W which energises the heater relay
and in turn energizes the electric heaters. The IFR is energized
which starts the indoor-fan motor. If the heaters are staged, W2 is
energized when the second stage of heating is required. When the
need for heating is satisfied, the heater and IFM are deenergized.

MAINTENANCE

To ensure continuing high performance, and to reduce the possi-
bility of premature equipment failure, periodic maintenance must
be performed on this equipment. This cooling unit should be
inspected at least once each year by a qualified service person. To
troubleshoot cooling of units, refer to Troubleshooting chart in
back of book.

NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.

WARNING: FIRE,

EXPLOSION,

ELECTRICAL

SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
The ability to properly perform maintenance on this
equipment requires certain expertise, mechanical skills,
tools and equipment. If you do not possess these, do not
attempt to perform any maintenance on this equipment,
other than those procedures recommended in the User’s
Manual.

The minimum maintenance requirements for this equipment are as
follows:

1. Inspect air filter(s) each month. Clean or replace when

necessary.

2. Inspect indoor coil, outdoor coil, drain pan, and condensate

drain each cooling and heating season for cleanliness. Clean
when necessary.

3. Inspect blower motor and wheel for cleanliness each

cooling and heating season. Clean when necessary. For first
heating season, inspect blower wheel bimonthly to deter-
mine proper cleaning frequency.

4. Check electrical connections for tightness and controls for

proper operation each cooling season. Service when neces-
sary.

5. Check the drain channel in the top cover periodically for

blockage (leaves, insects). Clean as needed.

TABLE 8—COOLING CHARGING CHART

SUCTION LINE TEMPERATURE (°F)

Suction Line Pressure (PSIG)

OD Temp. (°F)

—

105

—

115

—

125

—

SUCTION LINE TEMPERATURE (°C)

Suction Line Pressure (kPa)

OD Temp. (°C)

361

370

387

405

423

442

462

482

502

523

544

566

589

612

636

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