PEERLESS SERIES WV-DV, Installation, Operation & Maintenance Manual, Page: 7 / 24

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A. BOILER SUPPLY AND RETURN
1. See Figure 3.1 for suggested piping to the boiler.
2. Make up cold water supply connection to the boiler.
3. Plug all open tappings in the boiler and fill with
water. Apply approximately thirty (30) psi pressure.
Check to make certain that all joints and fittings are
water tight.
4. After all joints and connections have been proven
water tight, remove cold water supply and plugs
from all tappings that are to be used. See Figure 8.1
for tapping locations.
5. Return water piping must be done in such a manner
to allow clearance from the burner mounting plate to
other piping when opening and closing the burner
mounting plate.
3. PIPING AND CONTROLS
PIPING AND CONTROLS
6. The supply and return connections should be sized to
suit the system. A 1-1/2" to 1-1/4" reducing coupling
may be used on the return where the system piping is
1-1/2". The supply should be out of the top of the
back section and return to the bottom of the front
section. There is a 3/4" tapping in the top of the back
section for air elimination.
Figure 3.2
Note: If boiler is to be used in conjunction with a refrigeration
system, the chilled medium shall be piped in parallel with
boiler and proper valves applied to prevent the chilled
medium from entering the boiler. Refer to Figure 3.2.
When the boiler is connected to heating coils located in
air handling units, the boiler piping system must be
equipped with flow control valves or other automatic
devices to prevent gravity circulation of the boiler water
during the cooling cycle.
Figure 3.1