Patterson-Kelley MACH-05 User Manual

 

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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. 

 

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.   

 

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 
 

 

 

 

 

 

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” grooved 
connections for Victaulic Style 75 Couplings.  
These coupling must be used with the EPDM 
Victaulic seals.  Isolating valves must be installed 
in both water connections for ease of service. 

The bottom connection to the boiler is the INLET and 
must be used for the return from the system. 

The top connection to the boiler is the OUTLET and 
must be connected as the supply to the system. 

* Note: Condensate Trap must be piped to drain in 
accordance with all state and local codes. 

 

Condensate 
Trap (Piped to 
drain)* 

C300 

C450 

C750 C900 C1050