WARNING: The unit cabinet must have an uninter- rupted or unbroken ground to minimize personal injury if an electrical fault should occur. The ground may consist of electrical wire or metal conduit when installed in accordance with existing electrical codes. Failure to follow this warning can result in an electric shock, fire, or death.

B.Connect Ground and Power Wires

Connect ground wire to ground connection in control box for safety. Connect power wiring to contactor as shown in Fig. 8.

XIII. 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.

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

DISCONNECT

PER N. E. C. AND/OR LOCAL CODES

FIELD POWER

WIRING

FIELD GROUND

WIRING

CONTACTOR

GROUND

LUG

A91056

· Back seating service valves are not equipped with Schrader valves. Fully back seat (counter clockwise) 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.

Follow these steps to properly pumpdown a system and avoid negative suction pressure.

1.

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

2.

Unit is shipped with valve stem(s) front seated (closed) and

Fig. 8ÐLine Power Connections

C.Connect Control Wiring

Route 24-v control wires through control wiring grommet and connect leads to control wiring. (See Fig. 9±14.)

Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If thermostat is located more than 100 ft from unit, as measured along the control voltage wires, use No. 16 AWG color-coded wire to avoid excessive voltage drop.

All wiring must be NEC Class 1 and must be separated from incoming power leads.

Use furnace transformer, fan coil transformer, or accessory trans- former for control power, 24-v/40-va minimum.

NOTE: Use of available 24-v accessories may exceed the mini- mum 40-va power requirement. Determine total transformer load- ing and increase the transformer capacity or split the load with an accessory transformer as required.

IMPORTANT: Check factory wiring and wire connections to ensure terminations are secured properly. Check wire routing to ensure wires are not in contact with tubing, sheet metal, etc.

XI. COMPRESSOR CRANKCASE HEATER

When equipped with a crankcase heater, furnish power to heater a minimum of 24 hr before starting unit. To furnish power to heater only, set thermostat to OFF and close electrical disconnect to outdoor unit.

A crankcase heater is required if refrigerant tubing is longer than 50 ft.

XII. INSTALL ELECTRICAL ACCESSORIES

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

Ð5Ð

 

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.

Set room thermostat to desired temperature. Be sure set

 

point is below indoor ambient temperature.

5.

Set room thermostat to HEAT or COOL and fan control to

 

ON or AUTO mode, as desired. Operate unit for 15

 

minutes. Check system refrigerant charge.

A. Sequence of Operation

NOTE: Defrost control board may be equipped with 5-minute lockout timer which may be initiated upon any interruption of power.

With power supplied to indoor and outdoor units, transformer is energized.

COOLING

On a call for cooling, thermostat makes circuits R-O, R-Y, and R-G. Circuit R-O energizes reversing valve, switching it to cooling position. Circuit R-Y energizes contactor, starting outdoor fan motor and compressor circuit. R-G energizes indoor unit blower relay, starting indoor blower motor on high speed.

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

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

HEATING

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

Should temperature continue to fall, R-W2 is made through second-stage room thermostat bulb. Circuit R-W2 energizes a sequencer, bringing on first bank of supplemental electric heat and

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Bryant 663C Connect Ground and Power Wires, Xiii. Start-Up, → XI. Compressor Crankcase Heater, Sequence of Operation

663C specifications

The Bryant 663C is a high-efficiency gas furnace designed to deliver exceptional comfort and reliability in residential heating. As part of the Bryant lineup, it combines advanced technology with durable construction, ensuring homeowners can enjoy warmth during the coldest months while also being energy-efficient.

One of the standout features of the Bryant 663C is its impressive Annual Fuel Utilization Efficiency (AFUE) rating. With an AFUE of up to 96%, this furnace is designed to convert a significant portion of the fuel it consumes into usable heat, thus minimizing energy waste. This high-efficiency rating not only translates into lower utility bills but also has a positive impact on the environment.

The 663C is equipped with a two-stage heating system, which allows it to operate at different levels of output depending on the heating demand. This functionality provides enhanced comfort by eliminating temperature swings and maintaining a consistent indoor environment. In addition, the variable-speed blower motor adjusts the airflow based on the heating requirements, further optimizing efficiency and comfort.

Comfort and convenience are paramount in the design of the Bryant 663C. Its compatibility with Bryant's Wi-Fi-enabled smart thermostats allows homeowners to control their heating system remotely, providing ease of access and energy savings. The integration of advanced technology extends to its quiet operation; the unit is designed to minimize sound, ensuring that heating does not disrupt the peaceful ambiance of the home.

Durability is another critical aspect of the Bryant 663C. Constructed with a stainless steel heat exchanger, this furnace not only ensures optimal heat transfer but also resists corrosion, enhancing its lifespan. In addition, the inclusion of a durable cabinet and a heavy-duty blower motor offers further protection and reliability, making it a long-lasting investment for any homeowner.

Overall, the Bryant 663C stands out in the competitive market of heating systems due to its impressive efficiency, advanced features, and a commitment to comfort and longevity. Whether for new constructions or retrofitting an existing home, the 663C is an excellent choice for those seeking a reliable and energy-efficient gas furnace.