Weil-McLain SlimFit Manual page 13

SlimFit
™
commercial condensing gas
Prepare boiler
3. Attach a water supply and hand pump to the lower valves.
4. Attach a drain line to the upper valve.
5. Remove the pressure & temperature gauge from the trim box shipped
with the boiler.
6. Remove the factory-installed plug from the ½-inch tapping on top of
the boiler supply pipe.
7. Apply pipe dope to the P/T gauge and install in the ¼" tapping as shown.
Fill boiler and pressure test
1. Open the shutoff valves installed on the supply and return connections.
2. Allow water to flow into the bottom connection and air to flow out the
top connection.
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
upper shutoff valve.
4. Close off the water supply and use the hand pump to raise the water
pressure for testing.
5. The test pressure should be 1½ times the pressure setting of the relief
valve to be installed on the boiler (45 psig for a 30-psig relief valve;
75 psig for a 50-psig relief valve; or 150 psig for a 100-psig relief valve).
The test pressure MUST NOT exceed the maximum pres-
sure on the P/T gauge. If test pressure will be higher than the
maximum range of the P/T gauge, use a different gauge for
the test.
6. Gradually apply pressure until test pressure is reached. Then close off
the shutoff valve.
7. 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.
8. Make sure that constant gauge pressure has been maintained through-
out test.
9. Check for leaks. Repair if found.
Leaks must be repaired at once
so can damage boiler, resulting in substantial property
damage.
Do not use petroleum-based
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. Open upper shutoff valve.
3. Drain boiler through lower shut-off valve.
4. Remove hose or drain piping after draining.
5. Remove the blanking flange/valve assemblies from the boiler supply
and return flanges.
6. See page 14 to install relief valve in the 1¼" tapping on top of the boiler
outlet pipe.
Part number 550-100-116/0713
-
fired water boiler
(continued)
Failure to do
cleaning or sealing
— Boiler Manual
Figure 10
Hydrostatic test piping connections —
flanges, valves and gaskets provided by
installer
Boiler drain valve
1. If not installing a drain valve off of the return piping, install
a ¾-inch boiler drain valve in the ¾-inch tapping at the
lower right burner end of the heat exchanger (see Figure 7).
Figure 7 Boiler drain valve tapping — optional
location for drain valve
(provided by installer)
¾-inch
drain valve
tapping
13