Check For Clean Cut Off Of Burner; Test Controls; Cad Cell Test; Maintenance Of Low Water Cutoff Devices - Burnham V7 SERIES Installation & Operating Instructions Manual

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
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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IMPORTANT