Part number 550-100-131/0120
– 11 –
®
gas
-
fired
water
boiler
— 220/299/300/399
Boiler Manual
Figure 6
Install piping fittings for relief valve and
pressure/temperature gauge
––
DO NOT mount
relief valve until AFTER hydrostatic
testing
(see legend below)
Figure 7
Install piping components required for
hydrostatic test
(see legend below)
Boiler hydrostatic test
(continued)
Legend for Hydrostatic Testing
1 Boiler supply (outlet) connection, male 1½” NPT.
2 Boiler return connection, male 1½” NPT.
3 Boiler relief valve, shipped loose with boiler —
DO NOT mount
relief valve until AFTER hydrostatic testing
.
3a
TEMPORARILY ONLY —
Insert a ¾” NPT plug in the relief
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.
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.
Piping to system
12
2
1
3
Piping from
system
Recommended but
not included
