Checking And Adjusting Controls; Maintenance - Carrier BW4 Installation, Start-Up, And Operating Instructions Manual

Oil-fired cast iron hot water boilers sizes 74,000 through 239,000 series a

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Table Of Contents

Table of Contents

UNIT SIZE

UNIT CAPACITY

120

181

239

C. Fuel Pump Unit

Replace pump screen and clean pump unit to maintain reliable fuel delivery to nozzle.

D. Ignition Electrodes

Clean and adjust as per manufacturer's recommendations so as to maintain reliable ignition of oil.

E. Nozzle

Replace so as to maintain safe and reliable combustion efficiency. Always replace with the exact nozzle as required in Table 3.

F. Fan and Blower Housing

These must be kept clean and free of dirt, lint, and oil so as to maintain proper amount of air the fuel requires to burn.

NOTE: If any component parts must be replaced, always use parts recommended by burner manufacturer.

WARNING: Do not attempt to start the burner when excess oil has accumulated, when unit is full of vapor, or when

the combustion chamber is very hot. Failure to follow this warning could result in fire, personal injury, or death.

IMPORTANT: These instructions must be followed carefully.

PROCEDURE 1—ADJUSTING OPERATING CONTROLS

Instructions for each control are included. Refer to Table 4 for recommended settings for the first adjustment:

High Limit

Low Limit (When Used)

Differential (When Used)

These settings can be changed after gaining familiarity with how system responds. If system does not give quite enough heat in very cold weather,

the high limit setting can be raised to 220°F. If more domestic hot water is required, the low limit setting can also be raised.

PROCEDURE 2—CHECKING THERMOSTAT OPERATION

When set above temperature indicated on thermometer, boiler burner should start. Make certain thermostat shuts boiler down when room

temperature reaches selected setting and starts boiler operating when room temperature falls a few degrees.

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

NOTE: Do not start burner unless all cleanout doors are secured in place.

To assure trouble-free operation, we recommend that flue passages, burner, combustion chamber area (target wall and fire door insulation), burner

adjustment, and operation of controls be checked ONCE EACH YEAR by a competent service technician.

BEFORE THE START OF EACH SEASON (or whenever system has been shut down for some time), recheck the whole system for leaks and

recheck boiler and vent pipe for leaks. Replace or patch any boiler seals that are faulty.

WARNING: Never burn garbage or paper in the unit, and never leave combustible material around it.

PROCEDURE 1—RELIEF VALVE

This valve should open automatically when system pressure exceeds the safe limit (30 psi). Should it ever fail to open under this condition, shut

system down. Drain it until pressure is reduced below safe limit, then have valve replaced immediately. The relief valve should be tested monthly

during heating season. Refer to valve manufacturer's instructions packaged with relief valve.

Table 3—Oil Burner Nozzles

DELAVAN NOZZLE TYPE FOR

BECKETT AFG OIL BURNER

74,000

92,000

120,000

111,000

153,000

181,000

147,000

210,000

239,000