Carrier 58CMA → -Burner Input and Nozzle Size at 100 psi Pump Pressure, Speed Selection

c.Use of an oversized nozzle input.

d.Pump pressure over values listed in Table 10.

5.The CO2 and stack temperature instruments enable you to obtain data required to determine thermal efficiency of fur-

nace.

6.An oil filter should be installed as close to burner as possible with ALL oil burners and is essential on lower firing rate burners. We recommend the use of a low pressure drop oil filter such as the General Filter, Inc. model #1A-25A or equivalent.

→7. The oil pressure regulator is factory set to give oil pressure of 100 psi for the model having 105,000 BTUH input and 100 psi for the model having 119,000 BTUH input. The firing rate noted on nameplate may be obtained using the nozzles and pump pressures indicated in Table 10.

→Table 10—Burner Input and Nozzle Size at 100 psi

Pump Pressure

FURNACE	INPUT		REAL PUMP	SPECIFICATION
INPUT		NOZZLE
	USGPH		PRESSURE	PUMP PRESSURE
(BTUH)
70,000	0.50	0.50-70W	100	100
91,000	0.65	0.55-70B	140	140
105,000	0.75	0.65-70B	133	130
120,000	0.85	0.75-70B	128	130
140,000	1.00	0.85-70B	138	140
155,000	1.10	0.85-70B	167	170

8.On a new installation, air entrapped in oil line leading from tank to nozzle must be thoroughly purged in order to prevent excessive after drip. The oil pump is provided with a special fitting which allows purging of any air between tank and oil pump. The proper procedure for performing this operation is as follows:

a.Place a piece of clear plastic 1/4 in. diameter tubing over purge fitting on oil pump.

b.Start oil burner, then open purge fitting and allow burner to run until purge tube is completely free of air bubbles.

c.Tighten purge fitting. Allow oil to run to nozzle and fire burner.

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.

Step 3—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.

When operating furnace in heating mode, static pressure and temperature rise (supply-air temperature 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.

Table 11—Speed Selection

UNIT	FURNACE	RECOMMENDED
	INPUT	BLOWER
SIZE
	(BTUH)	SPEED
105-12/	70,000/119,000	Med-Low
	91,000/140,000	Med-High
120-20
	105,000/154,000	High
	.

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

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)

Step 4—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.

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

Step 5—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.

Step 6—Heating

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

Step 7—Cooling

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

Step 8—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.

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