Perform Hydrostatic Pressure Test - Weil-McLain 550 MBH Nstallation And Operation Manual

®
SlimFit Series 3
Prepare boiler
lowable relief valve setting for the SlimFit boiler.
The boiler is shipped with a 30 PSIG relief valve.
See Replacement parts in the back of this manual
for alternate pressure setting relief valves.

Perform hydrostatic pressure test

Pressure test boiler before permanently attaching water or gas
piping or electrical supply.
Prepare boiler for test
1. See Figure 3 for reference in following steps. Use pipe dope
sparingly.
2. Remove 2" supply line tee, 2x¾" bushing and ¾" nipple from
accessory bag.
3. Pipe 2" tee, bushing and ¾" nipple to boiler supply connec-
tion as shown.
4. Temporarily plug the end of the 2" supply tee.
5. Attach a ¾" shut-off valve (by others) to the ¾" nipple.
6. Attach a 2-inch tee (by others) to the boiler return pipe.
7. Install a bushing and a ¾-inch boiler drain valve off of the
tee as shown. Temporarily plug the end of the tee. (All fit-
tings by others.)
8. Connect a hose to the boiler drain valve, with the other end
connected to a fresh water supply. Make sure the hose can
also be used to drain the boiler after test.
9. To avoid getting water on the boiler, you may want to pipe
street elbows on top of shutoff valves and attach catch-buckets
beneath.
10. If convenient, install any other piping compatible with Fig-
ure 3 that would still allow bleeding air from shutoff valves.
Fill and pressure test
1. Open the shutoff valves you installed on supply and return
connections.
2. Slowly open boiler drain valve and fresh water supply to fill
boiler with water. The boiler will fill quickly because of its
low water content.
3. When water reaches the shutoff valve on top, allow water to
flow long enough to ensure all air is out of the heat exchanger.
Then close the boiler drain valve.
4. Close shutoff valve on top.
5. Increase test pressure until the pressure/temperature gauge
reaches 120 psig, but no higher. DO NOT exceed 120 psig.
6. Hold at test pressure for 10 minutes.
Do not leave boiler unattended. A cold water fill
could expand and cause excessive pressure, result-
ing in severe personal injury, death or substantial
property damage.
7. Make sure constant gauge pressure has been maintained
throughout test. Check for leaks. Repair if found.
Part number 550-100-168/0516
COMMERCIAL CONDENSING GAS
(continued)
. This is the maximum al-
—
-
FIRED WATER BOILER
Hydrostatic test piping connections
Failure to do so can 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 damaged. 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. Remove hose after draining.
3. Remove pipe fittings unless they will remain for use in the
system piping.
4. Remove the ¾" shut-off valve from the ¾" relief valve nipple.
5. See page 12 to install relief valve (female)on the ¾" nipple.
Boiler Manual
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