Start-Up; Fill The System; When Using Antifreeze; To Place In Operation - Weil-McLain WGO 4 Series Manual

WGO
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 —

Start-up

Fill the system

1. Close manual and automatic air vents and boiler drain cock.
2. Fill to correct system pressure. Correct pressure will vary
with each installation. Normal cold water fill pressure for
residential systems is 12 psig. Boiler water pH 7.0 to 8.5 is
recommended.
Failure to maintain recommended pH level can
cause section failure and leaks.
3. Open automatic air vent one turn.
4. Open other vents.
a. Starting on the lowest floor, open air vents one at a time
until water squirts out. Close vent.
b. Repeat with remaining vents.
5. Refill to correct pressure.

When using antifreeze

Do not use automotive, ethylene glycol, undiluted
or petroleum-based antifreeze. Severe personal
injury, death or substantial property damage can
result.
• Use antifreeze especially made for hydronic systems. Inhib-
ited propylene glycol is recommended.
• 50% solution provides protection to about -30°F. Do not
exceed 50% mixture.
• Local codes may require back-flow preventer or actual dis-
connect from city water supply.
• Determine quantity according to system water content.
Boiler water content is listed on back cover of manual. Per-
cent of solution will affect sizing of heat distribution units,
circulator and expansion tank.
• Follow antifreeze manufacturer's instructions.
• Do not add cold water to hot boiler. Thermal shock can
cause sections to crack.
Part number 550-142-331/0421
SERVICE TECHNICIAN ONLY — read and follow completely.
Boiler Manual

To place in operation

1. Verify boiler is filled with water.
2. Open burner mounting door and verify rear target wall, floor
and burner door insulations are in proper position.
3. Verify burner mounting door is closed tightly and burner
wiring harness is connected to Hydrolevel control.
4. Factory burner adjustment and settings may not be suitable
for specific job conditions. See Close Clearance Installation,
page 31.
A burner nozzle change may be required - refer to the
burner instructions or boiler's rating label for correct
nozzle selection
Make final burner adjustments using combustion
test equipment to assure proper operation. Do not
fire boiler without water. Sections will overheat,
damaging boiler and resulting in substantial prop-
erty damage.
5. Vent air from system. Repeat steps 4 and 5 under "Fill the
system." Air in system can interfere with water circulation
and cause improper heat distribution.
6. Check boiler and system piping for leaks. See "Tips for water
systems" on page 4.
7. Inspect breeching and venting for proper operation.
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