Bryant 698B → B. Airflow Selection for 355MAV Furnaces, Route Ground and Power Wires

DISCONNECT

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

FIELD POWER

WIRING

FIELD GROUND

WIRING

CONTACTOR

GROUND

LUG

A91306

recommended airflow and for adjustments to the manual switches labeled SW1, A/C and CF on the control board refer to the furnace Installation, Start-Up, and Operating Instructions. The 315AAV/315JAV utilizes a control center that allows the install- ing technician to select the proper airflows. The A/C switch determines the airflow during high speed compressor operation. Airflow for high and low speed can be calculated at either 350 CFM per ton or 400 CFM per ton based on the positions of SW1-5.

→ B. AIRFLOW SELECTION FOR 355MAV FURNACES

The 355MAV Condensing Variable-Speed Furnaces provide high-

and low-speed blower operation to match the capacities of com-

pressor at high and low speeds. To select recommended airflow,

refer to the 355MAV Installation Instructions. The 355MAV

utilizes a control center that allows the installing technician to

Fig. 12—Line Power Connections

NOTE: Install branch circuit disconnect of adequate size per NEC to handle unit starting current. Locate disconnect within sight from and readily accessible from unit, per Section 440-14 of NEC.

A. ROUTE GROUND AND POWER WIRES

Remove access panel and control box cover to gain access to unit wiring. Extend wires from disconnect through power wiring hole provided and into unit control box. Size wires per NEC but not smaller than minimum wire size shown in Product Data Sheet.

WARNING: The unit cabinet must have as 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 leads provided as shown in Fig. 12.

C. CONNECT CONTROL WIRING

Route 24v control wires through control wiring grommet and connect to leads provided in control box. (See Fig. 13.)

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.

The outdoor unit requires a minimum of 27va, 24v control power.

D. FINAL WIRING CHECK

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.

IX. INSTALL ELECTRICAL ACCESSORIES

A. GENERAL

Refer to the individual instructions packaged with kits or acces- sories when installing. The liquid line solenoid valve accessory is available on these units. See Fig. 14 for wiring diagram.

See Fig. 13 for typical accessory wiring diagrams.

X. MAKE AIRFLOW SELECTIONS

A.AIRFLOW SELECTION FOR 315AAV/315JAV FUR-

NACES

The 315AAV/315JAV Non-Condensing Variable Speed Furnaces provide high- and low-speed blower operation to match the capacities of the compressor at high and low speeds. To select the

select proper airflow. For adjustments to the manual switches

labeled A/C and CF and recommended switch positions, refer to

Furnace Installation Instructions for setting required airflow.

High-speed airflow is determined by the position of the A/C

switches, and low-speed airflow is determined by the position of

the CF switches.

→ C. AIRFLOW SELECTION FOR FK4 OR FV4 FAN COILS

The FK4 and FV4 provide high- and low-speed blower operation

to match the capacities of compressor at high and low speeds. To

select recommended airflow, refer to the FK4 or FV4 Installation

Instructions. The FK4 and FV4 utilize an EASY SELECT control

board that allows the installing technician to select proper airflow.

The ORANGE SYSTEM TYPE JUMPER wire should be set to

HP–EFF or HP–COMFORT. The BLUE AC/HP SIZE JUMPER

is used to select airflow to match the outdoor unit nominal size in

tons of cooling. The BLACK AC/HP CFM ADJUST jumper is

used to make slight adjustments to the selected airflow tonnage.

See the fan coil Installation Instructions for setting required

airflow. This fan coil has an adjustable blower off delay factory set

at 90 sec for high- and low-speed blower operation.

XI. 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.

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 (counter clockwise) valve system before removing gage port cap.

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

Follow these steps to properly start up the system:

1.The outdoor unit is equipped with a crankcase heater which operates when the compressor is OFF. Energize crankcase heater 24 hr before starting unit. To energize heater only, set indoor thermostat to OFF position and close power discon- nect to unit.

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

3.Unit is shipped with valve stem(s) front seated and caps installed. Replace stem caps after system is opened to refrigerant flow (back seated). Replace caps finger tight and tighten additional 1/12 turn (20 ft-lb torque) with wrench.

—7—