Weil-McLain Evergreen EVG 220 Manual page 11

®
gas
Boiler hydrostatic test
Figure 6
Install piping fittings for relief valve and
pressure/temperature gauge –– DO NOT mount
relief valve until AFTER hydrostatic testing
(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 —
relief valve until AFTER hydrostatic testing.
3a TEMPORARILY ONLY —
valve tapping of the reducing tee.
This MUST BE REMOVED after the test and the relief
valve mounted here.
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 550-100-131/0120
-
fired water boiler
1
3
Piping to system
2
Piping from
system
12
Legend for Hydrostatic Testing
DO NOT mount
Insert a ¾" NPT plug in the relief
— 220/299/300/399 Boiler Manual
(continued)
Figure 7
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 hydro-
static testing, move drain valve to lowest point on the return piping.
(see legend below)
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