PeerlessBoilers PBC-34, Installation, Operation & Maintenance Manual

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9. Low Water Cut Off : When installing a probe type
LWCO, locate the LWCO in the boiler supply above
the top jacket panel. Refer to Section 7. Electrical
Connection in this manual for wiring details.
10. Circulator : The Central Heat circulator is to be sized
to overcome the pressure drop of the system while
providing the flow required by the boiler. The PBC™
Series boilers have a built in circulator that guarantees
the minimum flow rate is maintained through the unit.
D. SYSTEM PIPING
The following section describes the piping requirements
for the Series PBC™ boilers as well as some best practices
that will improve the operation and lifetime of the unit.
See Figure 4.6 and 4.7 for suggested boiler piping for
Central Heat and Domestic.
1. Central Heat Piping
a. Primary secondary piping required - Series
PBC™ boilers utilize a water tube heat exchanger
that requires a minimum flow rate through the
unit. The internal pump provides enough flow to
maintain this minimum flow rate. For the pump to
consistently perform the boiler must be piped in a
primary/secondary fashion.
18
WATER PIPING AND CONTROLS
Figure 4.5: ScaleCutter
®
Water Treatment System
for Domestic Water Plate Heat
Exchanger Protection.
Figure 4.2: Water and Condensate Connection
Points
Figure 4.4: Final Piping Example with Webstone
Plumb Kit.
For existing systems that use iron pipe for heating
piping, the installation of a magnetic filter and a Y-
Type strainer is highly recommended. A modulating
condensing boiler such as the Series PBC™ when
operating at ideal system temperatures can cause
scaling to release from older iron pipe systems that
will cause restrictions in the heat exchanger
passages.
NOTICE
Figure 4.3: Safety Relief Valve Location