Install Instructions

Part number 550-100-131/0715
– 11 –
™
GAS-FIRED WATER BOILER — Boiler Manual
&IGURE Install piping fittings for relief valve and
pressure/temperature gauge –– $/./4MOUNT
RELIEFVALVEUNTIL!&4%2HYDROSTATIC TESTING
(see legend below)
&IGURE 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 — $/./4MOUNT
RELIEFVALVEUNTIL!&4%2HYDROSTATICTESTING.
3a 4%-0/2!2),9/.,9 Insert a ¾” NPT plug in the relief valve
tapping of the reducing tee.
4HIS-534"%2%-/6%$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 hydrostatic
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