Weil-McLain Evergreen 220 User Manual page 11

™ GAS
Boiler hydrostatic test
Install piping fittings for relief valve and
pressure/temperature gauge ––
(see legend below)
1 Boiler supply (outlet) connection, male 1½" NPT.
2 Boiler return connection, male 1½" NPT.
3 Boiler relief valve, shipped loose with boiler —
3a
tapping of the reducing tee.
.
4 Pressure/temperature gauge, shipped loose with boiler.
5a Reducing tee, NPT, 1½" x 1¼" x ¾" on EVG 220 or 1½"x 1½"x ¾" on
EVG 299/300/399, shipped loose with boiler.
5b Reducing tee, NPT 1¼" x 1¼" x ¼" on EVG 220 or 1½" x 1½" x ¾" on
EVG 299/300/399, shipped loose with boiler.
Part number 550-100-131/0715
-
FIRED WATER BOILER
1
3
Piping to system
2
Piping from
system
12
Legend for Hydrostatic Testing
.
Insert a ¾" NPT plug in the relief valve
— Boiler Manual
(continued)
Install piping components required for
hydrostatic test
Recommended but
not included
6 Bushing, ¾" NPT x ¼" on EVG 299/300/399, shipped loose with boiler.
7 Nipple, 1¼" NPT x close or 1½" NPT x close, shipped loose with boiler.
8 Unions, 1 ½" NPT by installer (recommended, but NOT furnished).
9 Pipe nipple, 1¼" NPT x close or 1½" NPT x close, by installer.
10 Isolation valve on supply connection, by installer (1¼" NPT on EVG 220,
1 ½" NPT on EVG 299/300/399).
11 Isolation valve on return connection, by installer (1¼" NPT on EVG 220,
1½" NPT on EVG 299/300/399).
12 ¾" NPT boiler drain valve, shipped loose with boiler — after hydrostatic
testing, move drain valve to lowest point on the return piping.
(see legend below)
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