MACH® Series
Gas-Fired Boiler
Installation
Page 15
Pre s s ure Drop Chart
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Flow (GPM )
De
lt
a
P
(f
t H2
O
)
Proper flow rates may be achieved through a
combination of primary and secondary flow loops.
Multiple zones and pumps may result in different flow
rates at different times. Consideration must be given
to all possible conditions and their consequences.
Piping With Refrigeration Machines
When installed in a two-pipe system that provides both
chilled and hot water, the control system should be
configured so as to limit the time rate of change of
temperature at the boiler. Consult your authorized
Patterson-Kelley boiler representative for application
guidance.
Piping With Air Handling Units
The boiler piping system of a hot water heating boiler
connected to heating coils located in air handling units,
where they may be exposed to refrigerated air
circulation, must be equipped with flow control valves
or other automatic means to prevent gravity circulation
of the boiler water during the cooling cycle.
3.8.2 Boiler Inlet and Outlet Connections
Boiler Inlet and Outlet Connections
Make water connections as the application warrants, or
at a minimum as shown, but always in compliance
with the local requirements.
Note: The boiler is furnished with 2.5” grooved
connections for Victaulic Style Couplings. These
coupling must be used with the EPDM Victaulic
seals. Adapters from Victaulic to NPT are
available from the factory.
Isolating valves must be
installed in both water connections for ease of service.
The bottom rear connection to the boiler is the INLET
and must be used for the return from the system.
The top vertical connection to the boiler is the
OUTLET and must be connected as the supply to the
system.
The Condensate Trap must be piped to drain in
accordance with all state and local codes.
C1500
C2000
