Patterson-Kelley MACH-05 Boiler Inlet and Outlet Connections, Piping With Refrigeration Machines

MACH® Series Gas-Fired Boiler Installation

3.8.2 Boiler Inlet and Outlet Connections

C750 C900 C1050

C450

C300

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.

Condensate Trap (Piped to drain)*

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.

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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.