Check Expansion Tank; Check Control Settings - Weil-McLain Ultra Commercial Installation And Start-Up Manual

COMMERCIAL GAS
Annual startup
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 hard-
ness). See page 70.

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 expan-
sion tanks and air eliminators.
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. Eventually, the tank will waterlog and no longer control
pressurization. The boiler relief valve will weep frequently.
Diaphragm- or bladder-type
membrane to separate the tank pressurizing 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 require at least one
automatic air vent, preferably located on top of an air elimina-
tor, as shown in examples in this manual.
2. If relief valve has tended to weep frequently, the expansion tank may
be waterlogged or undersized.
— tank is most likely waterlogged. Install a
Closed-type tank
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.
Diaphragm- or bladder-type
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 (usually 12 psig for residential applications). If tank won't
hold pressure, membrane has been damaged. Replace tank.
80
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FIRED WATER BOILER
(continued)
— welded gas tight with a rubber
— first, check tank size to be sure it
— Boiler Manual
Inspect ignition electrode
1. Remove the ignition electrode from the boiler heat
exchanger.
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.
Check ignition wiring
1. Check ignition cable electrical resistance. A good
cable will have resistance between 900 and 1000
ohms. Replace if not acceptable.
2. Inspect boiler ground wire from ignition electrode
to ground terminal strip.
3. Verify all wiring is in good condition and securely
attached.
4. Check ground continuity of wiring using continu-
ity meter.
5. Replace ground wires if results are not satisfac-
tory.
Check all boiler wiring
1. Inspect all boiler wiring, making sure wires are in
good condition and securely attached.

Check control settings

1. Use the U-Control display to navigate through all
settings. Adjust settings if necessary.
2. Check settings of external limit controls (if any)
and adjust if necessary.
Perform startup and checks
1. Start boiler and perform checks and tests specified
in this manual.
2. Verify cold fill pressure is correct and that operating
pressure does not go too high.
3. Complete the check-out procedure on page 76.
Part number 550-100-086/0809