Normal Sequence Of Operation; Operating Instructions - UTICA BOILERS SW3 Installation, Operation & Maintenance Manual

• Thermostat will activate, completing circuit to aquastat.
• Circulator motor starts and power is switched to
limit. If limit circuit is closed burner motor circuit is
energized.
• Burner motor starts prepurge and approximately 15
seconds after solenoid valve opens and ignition system
is activated, ignition will begin.
• In event boiler water temperature exceeds high limit
setting on boiler mounted aquastat; Power will be
interrupted between aquastat and ignition system.
Burner motor will continue to run in post purge mode
for approximately 2 min. or until water temperature
drops below high limit setting. Circulator will continue
to operate under this condition until thermostat is
satisfied.
Venting system should be inspected at start of each heating
season.
• Check vent pipe from boiler to termination cap for
signs of deterioration by rust or cracked silicone joints.
Repair if necessary.
• Lever of pressure relief valve, shown in Figure 14, on
page 15, on boiler should be operated periodically to
make sure it is functioning properly. Pressure relief
valve should open before water pressure exceeds 30 lb.
reading on gauge. If pressure is exceeded and pressure
relief valve leaks water when boiler is operating at
normal pressures, immediately replace. Corrosion can
build up rapidly at valve seat preventing it functioning
as safety device.
!
Water will be boiling hot.
Start-up and adjustment of oil burner (See oil burner
instructions for nozzle and electrode setting).
A. Check oil burner nozzle to make certain it is tight in
adapter. Burner mounting bolts should be tight.
B. Check electrode setting, as they may have been
jarred out of position during transportation.
C. Lubricate burner motor and circulator motor if
required. Some circulators are water lubricated and
do not require oiling.
D. Set room thermostat to call for heat.
E. Open all oil line valves.
F. Turn service switch on. Burner should start.
G. On one pipe fuel systems only, vent pump as soon
as burner starts. Allow oil to run until all traces of
air in the suction line disappear.

NORmAL SEquENCE OF OpERAtION

OpERAtINg INStRuCtIONS

WARNING
• When thermostat is satisfied power is interrupted to
boiler mounted aquastat and burner will run in post
purge mode for 2 minutes.
H. Turn "OFF" burner and install pressure gauge in
port on pump.
I. Start burner again and check oil pressure for 140
lbs. Adjust if necessary.
!
Do not set fire visually.
Instruments are only reliable method to determine proper
air adjustments. Improperly adjusted burner causes soot
and high fuel bills because of incomplete combustion of fuel
oil. This in turn may require excessive boiler maintenance,
service costs. Consult competent service mechanic to make
proper adjustments with smoke tester, CO
draft gauge. Bacharach or Dwyer test kits include these
instruments.
• 1/4" diameter slot is provided in inspection cover plate
to take draft reading in combustion chamber.
• 3/8" hole is provided in vent appliance adapter to take
draft, CO , smoke, and temperature readings.
2
• Adjust air dial on oil burner to obtain trace of smoke.
Measure CO at this point and increase air setting until
2
CO = 1-1.5% lower than reading at trace point.
2
• Check draft over fire and in vent, normal readings will
be positive (+.01 Over-fire & +.02 In Vent) W.C.
14
CAUTION
indicator and
2