PRESSURE REGULATOR

 

 

ADJUSTMENT

 

 

(UNDER CAP SCREW)

OUTLET

 

 

 

 

 

WIRING

PRESSURE

 

 

TAP

 

TERMINALS (3)

 

GROUND

 

INLET

 

 

 

TERMINALS (2)

 

PRESSURE

 

 

 

 

 

TAP

 

 

38to 12

GAS

 

GAS

 

INLET

ON

OUTLET

 

 

 

FLAME

 

 

 

ON SENSOR

 

OFF

PILOT

 

 

PILOT

 

GAS CONTROL

OUTLET

 

ADJUSTMENT

 

KNOB SHOWN

(UNDER CAP

 

 

IN "ON" POSITION

SCREW)

 

 

A95160

 

A95520

Fig. 9ÐPilot Flame and Sensor

Fig. 10ÐAutomatic Gas Valve

Table 6ÐRecommended Boiler Water Temperatures

 

 

TYPE OF HEATING UNIT

LIMIT CONTROL SETTING

 

Standing Radiators

 

180°F

 

Baseboard and Convector Radiators

 

200°F

 

CHECKING AND ADJUSTING

PROCEDURE 1ÐGAS VALVE SAFETY SHUTDOWN TEST

With main burners firing, disconnect ignition cable from intermittent pilot control box. Gas valve should shut off main burners. TURN OFF ELECTRIC POWER to boiler before reconnecting ignition cable to prevent electric shock.

PROCEDURE 2ÐPILOT BURNER ADJUSTMENT

Pilot flame should surround 3/8- to 1/2-in. of pilot sensor. (See Fig. 9.) If flame needs adjusting, proceed as follows:

1.Remove screw cover over pilot adjusting screw. (See Fig. 10.)

2.Insert small screwdriver and adjust flame as needed. (See Fig. 9 and 11.) Turn screw counterclockwise to increase flame and clockwise to decrease flame.

3.Replace screw cover over pilot adjusting screw.

PROCEDURE 3ÐMAIN BURNER(S)

The main burners do not require primary air adjustment and are not equipped with primary air shutters. Main burner flames should form sharp blue inner cones in a softer blue out mantel, with no yellow. Puffs of air from blowing on the flame or stamping on the floor will cause the flames to turn orange momentarily. This is not unusual. Remain still when observing the main burner flames. If the flame appearance is not correct, check main burner orifices and the burner throat and flame ports for dust and lint obstruction. It may be necessary to remove the rollout shield to observe the main burner flames. Replace rollout shield after observation. (See Fig. 11.)

PROCEDURE 4ÐLIMIT CONTROLS ADJUSTMENT

Instructions for each control are included with controls.

Table 6 shows recommended boiler water temperatures. These settings can be changed after becoming familiar with system operation. For example, if system is not giving quite enough heat in very cold weather, the limit setting can be raised to 220°F.

PROCEDURE 5ÐTHERMOSTAT HEAT ANTICIPATOR ADJUSTMENT

Instructions for final adjustment of thermostat are packaged with thermostat. Set heat anticipator at 0.2.

Check thermostat operation. When set above temperature indicated on thermometer, boiler burners should ignite. Make certain thermostat shuts boiler off when room temperature reaches selected setting and starts boiler operating when room temperature falls a few degrees.

PROCEDURE 6ÐSAFETY CONTROLS CHECK

After setting limit control to desired setting, check to see if it shuts off gas supply to burners. Set thermostat to call for heat and let boiler run until temperature of water reaches limit setting. Gas valve should shut off and circulator should keep running until thermostat is satisfied or water cools enough to restart burners through limit control.

To check operation of contacts in pressure switch, disconnect rubber tubing (located between blower and pressure switch) from pressure switch while boiler is operating. The burners should extinguish, and blower should keep running. When tubing is reconnected to pressure switch, ignition sequence should begin, resulting in ignition of main burners.

Finally, set thermostat for desired temperature. Special conditions in home and location of thermostat govern this setting.

Safe lighting and other performance criteria were met with gas manifold and control assembly provided on boiler when boiler underwent tests specified in ANSI Z21.13.

Ð16Ð

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National Products Series B, BW3 instruction manual Procedure 2ÐPILOT Burner Adjustment, Procedure 3ÐMAIN Burners

BW3, Series B specifications

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