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WM97+
-
gas
fired water boiler
Boiler hydrostatic test
DO NOT install a relief valve with a
pressure higher than 30 PSIG
is the maximum allowable relief 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 connection to the boiler
Failure to prevent the boiler pipes from
turning could damage pipes, resulting in
possible severe personal injury, death or
substantial property damage.
Hydrostatic pressure test
Pressure test the boiler before permanently attaching
water or gas piping or electrical supply.
Install pipe fittings for relief
valve and P/T gauge
1. Install the two 1" or 1¼" reducing tees, street ell and
close nipple shipped loose with the boiler, located
and oriented as shown in Figure 6, page 13.
2. Apply pipe dope to all fittings sparingly.
DO NOT install the relief valve until
after the hydrostatic test
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,
the relief valve must be
connected ONLY on the BOILER SUP-
PLY OUTLET
Connect the 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 as shown in Figure 6, page 13.
Install fittings and valves
required for hydrostatic testing
1. The following piping components (supplied by
installer) are required for the test configuration:
a. Two shut-off valves (1"NPT on 70/110; 1¼"
NPT on 155).
b. Two street ells (1"NPT on 70/110; 1¼" NPT
on 155).
c. 1" NPT or 1¼" NPT pipe nipples as shown in
Figure 7, page 13.
d. ¾" NPT pipe plug.
TEMPORARILY
2.
insert a ¾" NPT pipe plug in the
relief valve tapping. After the hydrostatic test, this
plug must be removed and the relief valve must
be installed.
– 12 –
. This
.
. Temporarily
NOT
,
the boiler return.
— Boiler Manual
Fill and pressure test
70/110 models only:
isolation valve
damaged if exposed to pressure above 42.5 PSIG.
1. CLOSE the boiler's primary/secondary by-pass valve (item 30, page 3
and page 5).
2. See Figure 7, page 13 for use with the following instructions.
3. CLOSE boiler drain valve (item 16). Connect a hose to fresh water
supply and to the drain valve.
4. Place a bucket under the ends of pipe nipples (item 15 and item 17)
to catch water drippage.
5. CLOSE isolation valve 12.
6. OPEN isolation valve 13.
7. Slowly open boiler drain valve (item 16) and fresh water supply to fill
boiler with water. The boiler and internal piping will fill quickly because
of the low water content.
8. When water begins to exit from the supply outlet nipple (item 15),
close the boiler drain valve (item 16).
9. OPEN the internal primary/secondary by-pass valve (item 30, page 3
and page 5).
10. OPEN isolation valve 12. Close this valve if water begins to run from
the return line nipple (item 17). Skip the next step.
11. Slowly reopen boiler drain valve until water begins to run from the
return nipple (item 17). Then CLOSE isolation valve 12.
12. Continue filling until water flows from supply outlet nipple (item 15).
Then CLOSE isolation valve 13.
13. When pressure on the pressure/temperature gauge reaches at least 45
PSIG, but no higher than 55 PSIG, CLOSE the boiler drain valve.
14. Hold at test pressure for 10 minutes.
Do not leave boiler unattended. A cold water fill could expand
and cause excessive pressure, resulting in severe personal
injury, death or substantial property damage.
15. Make sure constant gauge pressure has been maintained throughout
test. Check for leaks. Repair if found.
Leaks must be repaired at once.
damage boiler, resulting in substantial property damage.
Do not use petroleum-based cleaning or sealing compounds
in boiler system. Gaskets and seals in the system may be dam-
aged. This can result in substantial property damage.
Drain and remove fittings
1. Disconnect fill water hose from water source.
2. Drain boiler through drain valve.
Use caution when releasing pressure from the boiler. Rapid
water flow could cause injury.
3. Remove hose after draining.
4. Remove nipples and valves unless they will remain for use in the system
piping.
5. Remove plug and install relief valve as specified in the following
WARNING.
Remove plug from relief valve street elbow. Install the relief
valve in the ¾" street. See page 37 to install relief valve dis-
charge piping. Failure to install the boiler relief valve could
result in severe personal injury, death or substantial property
damage.
CLOSE the internal expansion tank
before hydrostatic testing. The tank will be
Failure to do so can
Part number 550-142-120/0113
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