Weil-McLain 550-141-826/1201 - Manual (Page 14)

SERVICE TECHNICIAN ONLY — read and follow completely.
Perform hydrostatic pressure test
1. See Figure 5 and Control Tapping table to install:
a. Boiler drain.
b. Water pressure gauge (test only). Be sure gauge can
handle test pressure.
c. Air vent in upper “N” tapping.
d. Plugs in remaining tappings.
2. Fill boiler. Vent all air. Pressure test boiler at 1 times work-
ing pressure. For boilers split and reassembled, test between
75 and 85 psig.
Do not leave boiler unattended. Cold water fill
could expand and damage cast iron, resulting in
severe personal injury, death or substantial prop-
erty damage.
3. Check for maintained gauge pressure for more than 10 min-
utes. Visually check for leaks if gauge pressure drops.
4. Drain boiler. Repair leaks if found.
Do not use petroleum-based compounds to repair
leaks. Damage to system components can result,
causing property damage.
5. Re-test boiler after repairing leaks.
6. Remove pressure gauge, air vent and plugs from tappings
used for controls.
Figure 5 Control tapping locations
Front section
E3
R1
C
L
B1
H
N
Location Size Function
B1 1½" Return piping
B2 1½"
Alternate return piping for
A/B WGO
C 1½" Supply piping
E3 1/4 "
Pressure-temperature
gauge
H ¾" Drain valve
L ¾" High limit control
N ½"
Air vent or expansion
tank piping
R1 ¾" Relief valve
Table 2 Control tappings
B2
Back section
Install boiler — non-packaged boilers only
(continued)
7. Visually check:
a. Sealing rope placement.
b. Metal-to-metal contact around port openings.
c. Flue collector hood seal.
d. Burner mounting door seal.
Obtain gas-tight seal to prevent possible flue gas
leakage and carbon monoxide emissions, which
can lead to severe personal injury or death.
Install jacket
(sizes 7 through 9 only)
Before installing jacket, remove burner mounting door. See jacket
instructions for details.
Install boiler controls
See Control Tapping Table and Figure 5 and Figure 6, page 15
to install controls.
1. Install limit control. If not furnished, use high limit with
maximum 220°F setting.
2. Affix CP number label(s) on jacket front panel.
Part number 550-141-826/1211 14
GOLD
WGO
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 —
Boiler Manual