Weil-McLain Evergreen 220 User Manual page 94

™
GAS
Annual startup
Check all piping for leaks
Eliminate all system or boiler leaks. Continual fresh
make-up water will reduce boiler life. Minerals
can build up in the heat exchanger, reducing heat
transfer, overheating heat exchanger, and causing
heat exchanger failure. Leaking water may also
cause severe property damage.
1. Inspect all water and gas piping and verify to be leak free.
2. Look for signs of leaking lines in the system and in the boiler
and correct any problems found.
3. Check gas line using procedure on page 49.
Check air openings
1. Verify that combustion and ventilation air openings to the
boiler room and/or building are open and unobstructed.
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.
Inspect flue vent system and air piping
Visually inspect entire flue gas venting system and combustion air
piping for blockage, deterioration or leakage. Proper replacement
of damaged components, reassembly, and resealing of the vent-
air intake system must be done if any of these signs are present
in accordance with the 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 (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 (pH, hardness and inhibitor
level). See page 84.
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. Tank types — see page 40.
— welded gas tight and located above boiler.
Closed-type
Tank is partially filled with water, leaving an air cushion
for expansion.
– 94 –
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FIRED WATER BOILER
(continued)
— Boiler Manual
Make sure a closed-type tank is fitted with a tank fit-
ting, 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
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.
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.
3. If relief valve has tended to weep frequently, the expansion
tank may be waterlogged or undersized.
a.
check tank size to be sure it is large enough for the sys-
tem. 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.
b.
waterlogged. 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.
Remove the burner access panel
1. See Figure 89.
2. Remove the burner access panel (item 1) located on the top
of the boiler jacket by removing the screws (item 3).
Remove the burner access panel and screws
(1 and 3) and air baffle and screws (2 and 4)
from the jacket top as shown below
— welded gas tight with
— first,
— tank is most likely
Part number 550-100-131/0715