Weil-McLain SlimFit 2 Series Manual page 13

SlimFit ® Series 2
Prepare boiler
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 con-
nections.
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
pressure 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 ex-
pand and cause excessive pressure, resulting in severe
personal injury, death or substantial property damage.
8. Make sure that constant gauge pressure has been maintained
throughout test.
9. Check for leaks. Repair if found.
Leaks must be repaired at once
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 sup-
ply and return flanges.
6. See page 14 to install relief valve in the 1¼" tapping on top of the
boiler outlet pipe.
Part number 550-100-561/0224
commercial condensing gas
(continued)
Failure to do so
cleaning or sealing
- — Boiler Manual
fired water boiler
Figure 9
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 10).
Figure 10
Boiler drain valve tapping – optional
location for drain valve
(provided by installer)
¾-inch
drain valve
tapping
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