Boiler Hydrostatic Test - Weil-McLain WM97+ Manual

WM97+ -
gas fired water boiler

Boiler hydrostatic test

DO NOT install a relief valve with a pressure higher
than 30 PSIG
valve setting for the WM97+ boiler. Failure to comply
could prevent the relief valve from operating as needed,
resulting in possibility of severe personal injury, death
or substantial property damage.
Use two wrenches when tightening any pipe con-
nection to the boiler
from turning could damage pipes, resulting in possible
severe personal injury, death or substantial property
damage.
Perform hydrostatic pressure test
Pressure test the boiler before permanently attaching water or gas
piping or electrical supply.
Install pipe fittings for relief valve and
pressure/temperature gauge
1. Install the (2) reducing tees, street ell and close nipple shipped
loose with the boiler, located and oriented as shown in Figure 6.
2. Apply pipe dope to all fittings sparingly.
DO NOT
install the relief valve until after the hydrostatic
test. Temporarily install a ¾" pipe plug in the relief valve
location as directed in these instructions. The plug must
be removed after the test.
Because the boiler contains an internal check valve,
relief valve must be connected ONLY on the BOILER
SUPPLY OUTLET
relief valve only as shown in this manual.
Failure to comply with the above could prevent the relief
valve from operating as needed, resulting in possibility
of severe personal injury, death or substantial property
damage.
3. Install the pressure/temperature gauge to the upper reducing tee.
Install fittings and valves required for
hydrostatic testing
1. The following piping components (supplied by installer)are re-
quired for the hydrostatic test configuration:
a. (2) 1" NPT valves (ball valve, gate valve or other).
b. (2) 1" NPT street ells.
c. 1" NPT pipe nipples as shown in Figure 7.
d. ¾" NPT pipe plug.
TEMPORARILY
2. insert a ¾" pipe plug in the relief valve tapping.
After the hydrostatic test, this plug must be removed and the relief
valve must be installed.
Fill and pressure test
CLOSE the internal expansion tank isolation valve
before hydrostatic testing. The tank will be damaged if
exposed to pressure above 42.5 PSIG.
1. CLOSE the boiler's primary/secondary by-pass valve (item 30,
page 3).
2. See Figure 7, page 11 for use with the following instructions.
10
— Boiler Manual
. This is the maximum allowable relief
. Failure to prevent the boiler pipes
NOT
, the boiler return. Connect the
Figure 6 Install pipe fittings for relief valve and
pressure/temperature gauge (DO NOT
mount relief valve until AFTER hydrostatic
testing)
the
1 Boiler supply (outlet) connection, 1" NPT male
2 Boiler return connection, 1" NPT male
3 Boiler relief valve, shipped loose with boiler — DO NOT install relief valve
until AFTER hydrostatic testing.
4 Pressure/temperature gauge, shipped loose with boiler
5 Street ell, ¾" NPT, shipped loose with boiler, for mounting boiler relief valve
— rotate the street ell to about 30° off center, as shown, to allow room for the
relief valve discharge piping.
6a Reducing tee, 1" x 1" x ¾" NPT, shipped loose with boiler
6b Reducing tee, 1" x 1" x ¼" NPT, shipped loose with boiler
7 Nipple, 1" x close, shipped loose with boiler
Part number 550-142-058/0811