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Annual startup (continued)
Check air openings
1. Verify that combustion and ventilation air openings
to the boiler room and/or building are open and un-
obstructed.
2. Check operation and wiring of automatic combustion
air dampers, if used.
3. Verify that boiler vent discharge and air intake are clean
and free of obstructions.
Flue vent system and air piping
1. Visually inspect entire flue gas venting system and
combustion air piping for blockage, deterioration or
leakage. Repair any joints that show signs of leakage in
accordance with vent manufacturer’s instructions. Verify
that air inlet piping is connected and properly sealed.
Failure to inspect for the above conditions
and have them repaired can result in severe
personal injury or death.
Check water system
1. Verify all system components are correctly installed and
operational.
2. Check the cold fill pressure for the system. Verify it is
correct (usually around 12 PSIG).
3. Watch the system pressure as the boiler heats up (dur-
ing testing) to ensure pressure doesn’t rise too high.
Excessive pressure rise indicates expansion tank sizing
or performance problem.
4. Inspect automatic air vents and air separators. Remove
air vent caps and briefly press push valve to flush vent.
Reinstall caps. Make sure vents do not leak. Replace any
leaking vents.
5. Check system water chemistry (pH, hardness and inhibi-
tor level). See page 75.
Check expansion tank(s)
1. Expansion tanks provide space for water to move in
and out as the heating system water expands due to
temperature increase or contracts as the water cools.
2. See page 37 or page 42 depending on system type for
information.
3. Tank types
s Closed-type — welded gas tight and located above
boiler. Tank is partially filled with water, leaving an
air cushion for expansion.
s Make sure a closed-type tank is fitted with a
tank fitting, such as the B & G Tank-trol or Taco
Taco-trol. This fitting reduces gravity circulation
of air-saturated tank water back to the system
and prevents the air from bubbling up through
the water as it returns from the system.
s Do not use automatic air vents in systems with closed-
type tanks. The air will escape from the system instead
of returning to the tank.
s Eventually, the tank will waterlog and no longer con-
trol pressurization. The boiler relief valve will weep
frequently.
s
Diaphragm- or bladder-type — welded gas tight with a
rubber membrane to separate the tank pressurizing air and
the water. May be located at any point in the system, but
preferably located on the suction side of the system circulator.
s Systems with this type of expansion tank require at least
one automatic air vent, preferably located on top of an
air eliminator, as shown in examples in this manual.
4. If relief valve has tended to weep frequently, the expansion tank
my be water logged or undersized.
a.
$IAPHRAGMORBLADDERTYPEEXPANSIONTANK — first, check
tank size to be sure it is large enough for the system. If size
is too small, add additional tank (or tanks) as necessary to
provide sufficient expansion. If tank size is large enough,
remove tank from system and check charge pressure (usu-
ally 12 PSIG for residential applications). If tank won’t hold
pressure, membrane has been damaged. Replace tank.
b.
#LOSEDTYPEEXPANSIONTANK — tank is most likely water-
logged. Install a tank fitting if not already installed. Then
check fill level per fitting manufacturer’s instructions. If
fill level is correct, check tank size against manufacturer’s
instructions. Replace with a larger tank if necessary.
Inspect ignition electrode
1. Remove the ignition electrode from the boiler heat exchanger
access cover (see item 23, page 3). (Disconnect the ground wire
and ignition cable connected to the electrode.)
2. Remove any white oxides accumulated on the ignition electrode
using steel wool. If the ignition electrode cannot be cleaned
satisfactorily, replace ignitor with a new one.
3. Reinstall ignition electrode, making sure gasket is in good condi-
tion and correctly positioned.
4/215%,)-)4 — Use a torque wrench when tight-
ening the two ignition electrode retainer screws. DO
NOT exceed 20 inch-pounds.
4. Re-attach the ground wire to the electrode assembly.
Part number 550-142-122/0513
86
TM
GAS-FIRED WATER BOILER — Boiler Manual
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