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SlimFit
®
Series 2
Annual startup
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 (during
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 (inhibitor concentration, pH
and hardness). See page 79.
Check boiler relief valve
1. Inspect the relief valve and lift the lever to verify flow as in
the following warnings, excerpted from a relief valve manu-
facturer's warning label. Before operating any relief valve,
ensure that it is piped with its discharge in a safe area to
avoid severe scald potential. Read manual section 3, page 12,
before proceeding further.
2. If the relief valve weeps or will not seat properly, replace the
relief valve. Ensure that the reason for relief valve weeping
is the valve and not over-pressurization of the system due to
expansion tank waterlogging or under-sizing.
Safety relief valves should be reinspected AT
LEAST ONCE EVERY THREE YEARS, by a
licensed plumbing contractor or authorized inspec-
tion agency, to ensure that the product has not
been affected by corrosive water conditions and
to ensure that the valve and discharge line have
not been altered or tampered with illegally. Certain
naturally occurring conditions may corrode the valve
or its components over time, rendering the valve
inoperative. Such conditions are not detectable
unless the valve and its components are physically
removed and inspected. This inspection must only
be conducted by a plumbing contractor or autho-
rized inspection agency — not by the owner. Failure
to reinspect the boiler relief valve as directed could
result in unsafe pressure buildup, which can result in
severe personal injury, death or substantial property
damage.
Following installation, the valve lever must be
operated AT LEAST ONCE A YEAR to ensure that
waterways are clear. Certain naturally occurring
mineral deposits may adhere to the valve, rendering
it inoperative. When manually operating the lever,
water will discharge and precautions must be taken
to avoid contact with hot water and to avoid water
damage. Before operating lever, check to see that
a discharge line is connected to this valve direct-
ing the flow of hot water from the valve to a proper
place of disposal. Otherwise severe personal injury
may result. If no water flows, valve is inoperative.
Shut down boiler until a new relief valve has been
installed.
Check expansion tank
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. Tanks may be open,
closed or diaphragm or bladder type. See section 3 of this
manual for suggested best location of expansion tanks and
air eliminators.
Part number 550-100-561/0224
commercial condensing gas
(continued)
-
— Boiler Manual
fired water boiler
•
Open-type — located above highest radiator or
baseboard unit, usually in the attic or closet. Has a
gauge glass and overflow pipe to a drain.
•
Closed-type — welded gas tight and located above
boiler. Tank is partially filled with water, leaving an
air cushion for expansion.
•
Make sure this type of 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.
•
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. Eventu-
ally, the tank will waterlog and no longer control
pressurization. The boiler relief valve will weep
frequently.
•
Diaphragm- or bladder-type
a rubber membrane to separate the tank pressur-
izing air and the water. May be located at any point
in the system, but most often found near the boiler.
•
Systems with this type of expansion tank re-
quire at least one automatic air vent, preferably
located on top of an air eliminator, as shown in
examples in this manual.
2. If relief valve has tended to weep frequently, the expansion
tank may be waterlogged or undersized.
•
Closed-type tank
Install a tank fitting if not already installed. Then
check fill level per fitting manufacturer's instruc-
tions. If fill level is correct, check tank size against
manufacturer's instructions. Replace with a larger
tank if necessary.
•
Diaphragm- or bladder-type
to be sure it is large enough for the system. If size
is too small, add additional tank (or tanks) as neces-
sary to provide sufficient expansion. If tank size is
large enough, remove tank from system and check
charge pressure (usually 12 psig for residential ap-
plications). If tank won't hold pressure, membrane
has been damaged. Replace tank.
Inspect ignition electrode
1. Remove the ignition electrode from the boiler heat
exchanger burner end section. See image at right.
Ignition electrode is longer than the flame sensor
(see below) and has a brown ceramic insulator.
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 condition and correctly positioned.
4. Replace gasket if necessary.
5. Make sure the ignition electrode ground wire is under
the top screw that secures the ignitor to the casting.
The ignition electrode must be installed on the
burner end section. The flame sensor must be
installed on the piping end section. Installing these
components in the wrong locations could cause
poor ignitions and lockout, resulting in loss of heat.
— welded gas tight with
— tank is most likely waterlogged.
— first, check tank size
89
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