Burnham V7 SERIES manual Check for Clean CUT OFF of Burner, Test Controls, Checkout Procedure

K.CHECK FOR CLEAN CUT OFF OF BURNER.

1.AIR IN THE OIL LINE between fuel unit and nozzle will compress when burner is on and will expand when burner stops, causing oil to squirt from nozzle at low pressure as burner slows down and causing nozzle to drip after burner stops. Usually cycling the burner operation about 5 to 10 times will rid oil line of this air.

2.IF NOZZLE CONTINUES TO DRIP, repeat step K.1.. If this does not stop the dripping, remove cutoff valve and seat, and wipe both with a clean cloth until clean, then replace and readjust oil pressure. If dripping or after burn persist replace fuel pump.

L.TEST CONTROLS.

WARNING

Before installation of the boiler is considered complete, the operation of the boiler controls should be checked, particularly the primary control and high limit control.

1.Check thermostat operation. Raise and lower thermostat setting as required to start and stop burner.

2.VERIFY PRIMARY CONTROL SAFETY FEATURES using procedures outlined in Instructions furnished with control (See back of control cover) or instructions as follows:

CHECKOUT PROCEDURE

FOR SERVICEMAN ONLY

a.Check wiring connections. Close line switch. Check power at control.

PRIMARY RELAY TEST

b.Disconnect cad cell leads (f-f). Reset safety switch.

c.Set controller to call for heat. Burner should start.

d.Jumper F-F terminal within 15 to 30 seconds. Burner should run.

e.Remove F-F Jumper. Burner shuts down in approximately 15 to 60 seconds.

f.If burner operates as described, relay is good. If not, install new relay.

CAD CELL TEST

g.Open line switch. Clean cell face and see that cell is securely in socket. Reconnect leads. Reset safety switch.

h.Close line switch. If burner starts and runs beyond safety switch cut-out time, cell is good. If not, install new cell.

3.WARNING — Check High Limit Control — Jumper Thermostat Terminals. Allow burner to operate until shut-down by limit. Installation is not considered complete until this check has been made.

REMOVE JUMPER.

4.Check low water cut off control with water level at normal water line (see Figure 1C). Raise thermostat setting to allow burner to operate. Open boiler drain to allow water level to drop to bottom of sight glass until burner operation is shut-down by low water cutoff.

Close boiler drain and refill to normal water line. Burner should automatically restart during fill. Lower thermostat setting.

5.Check operating control on boiler equipped with tankless heaters. With burner off, draw hot water until burner starts, then turn off hot water and check burner shut-down.

IF CONTROLS DO NOT MEET REQUIREMENTS OUTLINED IN PARAGRAPH L., REPLACE CONTROL AND REPEAT CHECK-OUT PROCEDURES.

M.MAINTENANCE OF LOW WATER CUTOFF DEVICES

IMPORTANT

Probe and float type low water cut-off devices require annual inspection and maintenance.

1.PROBE TYPE LOW WATER CUT-OFF

Although these devices are solid state in their operation, the probe is exposed to possible contamination in the boiler water and subject to fouling.

It is important to physically remove the probe from the boiler tapping annually and inspect that probe for accumulation of scale or sediment.

Follow these steps to inspect, clean and/or replace the probe:

a.Turn off electric service to the boiler.

b.Drain boiler water to a level below the tapping for the probe.

c.Disconnect wiring connections between the low water cutoff control and the probe.

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