Bryant 369RAN Burner Input and Nozzle Size, III. FAN Adjustment Check, Speed Selection

TABLE 10—BURNER INPUT AND NOZZLE SIZE

FURNACE	FIRING	RIELLO OIL BURNER		PUMP
INPUT	RATE	No. 40	Nozzle	PRESSURE
(BTUH)	GAL/HR (US)	Series Model		(PSIG)
70,000	0.50	F3	0.40 - 70A	160
91,000	0.65	F3	0.50 - 70W	170
105,000	0.75	F3	0.65 - 70W	135
119,000	0.85	F5	0.75 - 70B	130
140,000	1.00	F5	0.85 - 70W	140
154,000	1.10	F5	1.00 - 70W	125

d. If purging takes longer than 15 sec and no flame has been established, burner stops. Push reset button on front of primary control to restart burner.

e.For detailed information on operation of primary control, refer to instructions included with furnace.

After all the setup procedures mentioned above have been com- pleted, the burner should be allowed to operate and an inspection mirror should be used to observe the flame pattern at tip of nozzle. Any irregularities such as burning to 1 side or pulsating flame patterns should be corrected by changing nozzle.

III. FAN ADJUSTMENT CHECK

This furnace is equipped with a 4-speed direct-drive motor to deliver a temperature rise within range specified on rating plate, between return and supply plenums, at external duct static pressure noted on rating plate.

WARNING: When operating furnace in heating mode, static pressure and temperature rise (supply-air tempera- ture minus return-air temperature) must be within those limits specified on rating label. Failure to follow this warning could lead to severe furnace damage.

Adjust fan speed ACCORDING TO OIL INPUT SELECTED so that temperature rise is within rise range specified on rating plate. (See Table 11.) Consult wiring diagram for speed changes on direct-drive motor.

To adjust fan off time, set DIP switches on control board to obtain desired timing. (See Fig. 5.)

TABLE 11—SPEED SELECTION

	UNIT		FURNACE		RECOMMENDED
				INPUT	BLOWER
	SIZE
				(BTUH)	SPEED
036105/		70,000/119,000			Med-Low
		91,000/140,000			Med-High
060120
		105,000/154,000			High

Remove restriction, and burner should come back on in a few minutes.

V. FOR YEAR-ROUND AIR CONDITIONING

This furnace is designed for use in conjunction with cooling equipment to provide year-round air conditioning. The blower has been sized for both heating and cooling, however, fan motor speed may need to be changed to obtain necessary cooling airflow.

VI. HEATING

The blower speed is factory set to deliver required airflow at normal duct static pressure.

VII. COOLING

The blower speed may be field adjusted to deliver required airflow for cooling application. (See Table 12.)

VIII. CONSTANT BLOWER SWITCH

This furnace is equipped with a constant low-speed blower option. Whenever room thermostat is not calling for heating or cooling, blower runs on low speed in order to provide air circulation. If constant blower option is not desired, the rocker switch on top of cabinet may be used to turn off constant speed.

MAINTENANCE

WARNING: The ability to properly perform mainte- nance on this equipment requires certain expertise, me- chanical skills, tools, and equipment. If you do not possess these, do not attempt to perform any maintenance on this equipment other than those procedures recom- mended in the User’s Manual. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN POSSIBLE DAMAGE TO THIS EQUIPMENT, SERIOUS PER- SONAL INJURY, OR DEATH.

WARNING: Before performing any service functions, unless operations specifically require power to be on, make sure all utilities are turned off upstream of appli- ance. Failure to comply with this warning will cause a fire hazard and/or bodily harm.

WARNING: To avoid personal injury, make sure elec- trical supply power is off before servicing. Failure to follow this warning could lead to electrical shock, fire, or death.

1	2		1	2	1	2	1	2
60 Sec			90 Sec		120 Sec		150 Sec
		DELAY OFF DIP SWITCH SETTINGS

A95115

Fig. 5—Fan Off Time DIP Switch Settings (Black Box Represents Switch Position)

IV. LIMIT CONTROL CHECK

After furnace has been in operation for at least 15 minutes, restrict return-air supply by blocking filters or closing return registers and allow furnace to shut down on high limit. The burner should shut off, and main blower should continue to run.

—10—

I. GENERAL

In order to keep this furnace in good operating condition and to maintain its warranty, the furnace MUST be serviced on an annual basis. This servicing includes a nozzle change, a burner inspection, a visual check of tube passages through flue outlet and cleanout ports, and a visual inspection of combustion chamber when burner is removed.

Depending on above inspection, service could also include a cleaning and vacuuming of heat exchanger tubes and possibly the heat exchanger drum section.

Removal of any heat exchanger components which are sealed by gaskets requires replacement of gasket.