Ultra Boiler Manual
Part number 550-100-440/0122
111
MAINTENANCE & SPECIFICATIONS
(continued)
4. Inspect automatic air vents and air separators. Remove air vent caps
and briey press push valve to ush vent. Reinstall caps. Make sure
vents do not leak. Replace any leaking vents.
5. Check system water chemistry (pH, hardness and inhibitor level). See
page35.
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 page11 of this manual for suggested location of expansion
tanks and air eliminators.
• Open-type — located above highest radiator or baseboard unit,
usually in the attic or closet. Has a gauge glass and overow pipe
to a drain.
• Closed-type — welded gas tight and located above boiler. Tank is
partially lled with water, leaving an air cushion for expansion.
• Make sure this type of tank is tted with a tank tting, such
as the B & G Tank-Trol or Taco Taco-Trol. is tting 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. e air will escape from the system instead of returning
to the tank. Eventually, the tank will waterlog and no longer con-
trol pressurization. e boiler relief valve will weep frequently.
•
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 most oen 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 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 — tank is most likely waterlogged. Install a
tank tting if not already installed. en check ll level per tting
manufacturer’s instructions. If ll level is correct, check tank size
against manufacturer’s instructions. Replace with a larger tank if
necessary.
• Diaphragm- or bladder-type — rst, 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 sucient 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.
1. Remove the ignition electrode from the boiler heat
exchanger access cover.
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. Make sure the electrodes are parallel to each other.
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 heat exchanger
access cover 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 satisfactory.
1. Inspect all boiler wiring, making sure wires are in
good condition and securely attached.
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.
1. Start boiler and perform checks and tests specied
in this manual.
2. Verify cold ll pressure is correct and that operating
pressure does not go too high.
3. Complete the check-out procedure on page42.