Bryant 564B User Manual

Page 8

START-UP

Use the Start-Up Checklist supplied at the end of this book and
proceed as follows:

CHECK FOR REFRIGERANT LEAKS

LOCATE AND REPAIR REFRIGERANT LEAKS AND

CHARGE THE UNIT AS FOLLOWS:

1. Using both high- and low-pressure ports, locate leaks and

reclaim remaining refrigerant to relieve system pressure.

2. Repair leak following accepted practices.

NOTE: Install a liquid-line filter drier whenever the system has
been opened for repair.

II.

START-UP COOLING SECTION AND MAKE ADJUST-

MENTS

CAUTION: UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit compo-
nent damage.
Complete the required procedures given in the Pre-Start-
Up section this page before starting the unit. Do not
jumper any safety devices when operating the unit.
Do not operate the compressor in cooling mode when the
outdoor temperature is below 40 F.
Do not rapid-cycle the compressor. Allow 5 minutes
between ‘‘on’’ cycles to prevent compressor damage.

CHECKING COOLING CONTROL OPERATION

Start and check the unit for proper cooling control operation as
follows:

1. Place room thermostat SYSTEM switch in OFF position.

Observe that blower motor starts when FAN switch is
placed in ON position and shuts down within 60 seconds
(for 024-042) or 90 seconds (for 048 and 060) when FAN
switch is placed in AUTO position.

2. Place SYSTEM switch in COOL position and FAN switch

in AUTO position. Set cooling control below room tem-
perature. Observe that compressor, outdoor fan, and indoor
blower motors start and that reversing valve shifts. Observe
that cooling cycle shuts down when control setting is
satisfied. Reversing valve (RV) remains energized.

3. When using an automatic changeover room thermostat,

place both SYSTEM and FAN switches in AUTO. posi-
tions. Observe that unit operates in Cooling mode when
temperature control is set to ‘‘call for cooling’’ (below
room temperature), and unit operates in Heating mode when
temperature control is set to “call for heating” (above room
temperature).

III.

REFRIGERANT CHARGE

Refrigerant Charge — Amount of refrigerant charge is listed on
unit nameplate and in Table 2. Refer to Bryant Refrigerant Service
Techniques Manual, Refrigerants section. Unit panels must be in
place when unit is operating during charging procedure. Unit must
operate a minimum of 15 minutes before checking charge.

NO CHARGE

Refer to Bryant Refrigerant Service Techniques. Use standard
evacuating techniques. After evacuating system, weigh in the
specified amount of refrigerant (refer to Table 2).

LOW CHARGE COOLING

024-042 units:

1. Measure suction line pressure by attaching a gauge to the

service port

2. Measure the suction line temperature by attaching a tem-

perature sensing device to it.

Fig. 7—Unit Electrical Connection

A05198

HIGH-VOLTAGE POWER

WIRING ENTRY HOLE

LOW-VOLTAGE WIRING

ENTRY HOLE

Fig. 8—Control Box Wiring

A05197

3-PHASE
CONNECTIONS
TO DISCONNECT
PER NEC

SINGLE-PHASE
CONNECTIONS
TO DISCONNECT
PER NEC

GROUND

LEAD

UNIT GROUND

BLK

YEL

BLU

C00012

Fig. 9—Line Power Connections

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