Bryant 597C Accessory Usage, IX. Install Electrical Accessories, Start-Up, XI. Check Charge

TABLE 2—ACCESSORY USAGE

	REQUIRED FOR	REQUIRED FOR	REQUIRED FOR
ACCESSORY	LOW-AMBIENT	LONG-LINE	SEA COAST
	APPLICATIONS	APPLICATIONS*	APPLICATIONS
	(BELOW 55°F)	(OVER 50 FT)	(WITHIN 2 MILES)
Crankcase Heater	Yes	Yes	No
Evaporator Freeze Thermostat	Yes	No	No
Winter-Start Control	Yes†	No	No
Accumulator	No	No	No
Compressor Start-Assist	Yes	Yes	No
Capacitor and Relay
Low-Ambient Controller,
MotorMasterT Control,	Yes	No	No
or
Low-Ambient Pressure Switch
Wind Baffle	See Low-Ambient	No	No
	Instructions
Coastal Filter	No	No	Yes
Support Feet	Recommended	No	Recommended
Liquid-Line Solenoid Valve		See Long-Line
or	No	Application	No
Hard-Shutoff TXV		Guideline
Ball-Bearing Fan Motor	Yes‡	No	No

*For tubing-line sets between 50 and 175 ft, refer to Residential Split-System Long-Line Application Guideline.

† Only when low-pressure switch is used.

‡ Required for Low-Ambient Controller (full-modulation feature) and MotorMasterT Control only.

IX. INSTALL ELECTRICAL ACCESSORIES

Refer to the individual instructions packaged with kits or acces- sories when installing.

X. START-UP

CAUTION: To prevent compressor damage or personal injury, observe the following:

•Do not overcharge system with refrigerant.

•Do not operate unit in a vacuum or at negative pressure. •Do not disable low-pressure switch.

In scroll-compressor applications: •Dome temperatures may be hot.

•In 3-phase application, incorrect phasing will cause reverse rotation, resulting in elevated noise levels, equal- ized pressures, and reduced current draw. Correct by reversing power connection L1 and L2 on contactor.

CAUTION: To prevent personal injury wear safety glasses, protective clothing, and gloves when handling refrigerant and observe the following:

•Back-seating service valves are not equipped with Schrader valves. Fully back seat (counterclockwise) valve stem before removing gage-port cap.

•Front-seating service valves are equipped with Schrader valves.

CAUTION: Do not vent refrigerant to atmosphere. Re- cover during system repair or final unit disposal.

1.Fully back seat (open) liquid- and vapor-tube service valves.

2.Unit is shipped with valve stem(s) front seated (closed) and caps installed. Replace stem caps after system is opened to refrigerant flow. Replace caps finger-tight and tighten with wrench an additional 1/12 turn.

3.Close electrical disconnects to energize system.

—4—

4.Set room thermostat at desired temperature. Be sure set point is below indoor ambient temperature.

5.Set room thermostat to COOL and fan control to ON or AUTO mode, as desired. Operate unit for 15 minutes. Check system-refrigerant charge.

A.Sequence of Operation

Turn on power to indoor and outdoor units. Transformer is energized.

On a call for cooling, thermostat makes circuits R-Y and R-G. Circuit R-Y energizes contactor, starting outdoor-fan motor and compressor circuit. R-G energizes indoor unit-blower relay, start- ing indoor-blower motor on high speed.

When thermostat is satisfied, its contacts open, de-energizing contactor and blower relay. Compressor and motors stop.

If indoor unit is equipped with a time-delay relay circuit, the indoor blower will run an additional 90 sec to increase system efficiency.

XI. CHECK CHARGE

A. Unit Charge

Factory charge is shown on unit-rating plate. Adjust charge by following procedure shown on charging tables located on unit.

NOTE: If superheat- or subcooling-charging conditions are not favorable, charge must be weighed in accordance with unit-rating plate ± 0.6 oz/ft of 3/8-in. liquid line above or below 15 ft respectively.

EXAMPLE:

25 ft – 15 ft = 10 ft X 0.6 oz/ft = 6 oz of additional charge

B. Cooling Only Procedure

The following procedure is valid when indoor airflow is within ± 21 percent of its rated CFM.

1.Operate unit a minimum of 10 minutes before checking charge.

2.Measure suction pressure by attaching a gage to suction- valve service port.

3.Measure suction temperature by attaching an accurate thermistor-type or electronic thermometer to suction line at service valve.