Bryant 598B instruction manual Accessory Usage, VIII. Install Electrical Accessories General

TABLE 2—ACCESSORY USAGE

	REQUIRED FOR	REQUIRED FOR
ACCESSORY	LONG-LINE	SEACOAST
	APPLICATIONS*	APPLICATIONS
	(50-175 FT)	(WITHIN 2 MILES)
Coastal Filter	No	Yes
Support Feet	No	Recommended
Puron® Balance-Port Hard Shutoff TXV	Yes†	Yes†

*For tubing line sets between 50 and 175 ft horizontal or 20 ft vertical differential refer to Service Manual for Air Conditioners and Heat Pumps Using Puron® Refrigerant. Crankcase heater and start assist are standard on two-speed units.

† All two-speed units require hard shut-off TXV.

DISCONNECT

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

FIELD POWER

WIRING

FIELD GROUND

WIRING

CONTACTOR

GROUND

LUG

A91306

de-energized, the system operates on high-speed compressor and high-speed airflow until humidistat closes. Fig. 11 shows the wiring with a Bryant Thermidistat which controls temperature and humidity level without the need for an additional humidistat and relay.

LCC OPERATION FOR TYPICAL PSC FURNACES

The standard blower operation of systems with typical PSC furnaces is covered in Fig. 11. The blower runs in high or low speed in conjunction with compressor high- or low-speed opera- tion. When the LCC is wired according to Fig. 11, humidity rises, the humidistat contacts open and de-energize the relay. If relay is de-energized, the system operates on high-speed compressor and low-speed airflow until humidistat closes. Fig. 11 shows the wiring

Fig. 10—Line Power Connections

VIII. INSTALL ELECTRICAL ACCESSORIES

A. GENERAL

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

Available electrical accessories include latent capacity control. See Fig. 11 for typical accessory wiring diagrams.

B. LATENT CAPACITY CONTROL (LCC)

The purpose of an LCC is to provide a dehumidification mode to assure a 75 percent or less system sensible heat ratio. If indoor unit installed contains an ECM blower (such as an FK4C or FV4A fan coil or a 315(A,J)AV or 355MAV gas furnace), no LCC is required. Indoor products with ECM blowers have enough CFM range to provide proper airflow for low-speed cooling. If indoor unit installed has a standard PSC blower motor, the low-speed airflow available is too great to assure 75 percent or less system sensible heat ratio. The LCC for standard blower products consists of a standard humidistat which opens contacts on humidity rise and a pilot duty relay with 24v coil.

NOTE: If an LCC is desired, low-speed airflow must be main- tained so that a minimum of 300 CFM/ton can be supplied during high-speed LCC operation.

LCC OPERATION FOR TYPICAL PSC FAN COILS

The standard blower operation for systems with typical PSC fan coils is covered in Fig. 11. The blower runs in high speed regardless if compressor operation is high or low speed. When the LCC is wired according to Fig. 11 and humidity rises, the humidistat contacts open and de-energize the relay. If relay is

with a Bryant Thermidistat which controls temperature and hu- midity level without the need for an additional humidistat and relay.

IX. MAKE AIRFLOW SELECTIONS

A.AIRFLOW SELECTION FOR 315AAV/355MAV FUR-

NACES

The 315AAV/355MAV Non-Condensing Variable Speed Fur- naces provide high- and low-speed blower operation to match the capacities of the compressor at high and low speeds. To select the 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 utilizes a control center that allows the installing technician to select the proper airflows. The A/C switch determines the airflow during high speed compressor operation. Airflow for hight 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 FK4C OR FV4A FAN COILS

The FK4C and FV4A provides high- and low-speed blower operation to match the capacities of compressor at high and low speeds. To select recommended airflow, refer to the FK4C or FV4A Installation Instructions. The FK4C and FV4A utilize an EASY SELECT control board that allows the installing technician to select proper airflows. For adjustments to control board and recommended A/C SIZE and CFM ADJUST selections, refer to the fan coil Installation Instructions. This fan coil has an adjustable blower off delay factory set at 90 sec. for high- and low-speed blower operation.

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