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5. Piping The Boiler
All piping must conform to state and local codes. Page 11 shows the location
and size of the boiler tappings. It is recommended to install unions and gate valves at
the inlet and outlet of the boiler, so it may be readily isolated for service.
For Canadian installations, a low water cut off is required if the boiler is installed
above the level of radiation. Even if the boiler is installed below the level of radiation it
is strongly recommended that a low water cut off be installed. Install manual and/or
automatic air venting devices at the high points in the system to eliminate trapped air.
The weight of all piping should be supported by suitable hangers and floor stands, not
by the boiler’s purging/expansion station. Clearance for hot water pipes are 1 inch to
combustibles. The make-up water line must be piped into the boiler and be fitted with
a backflow preventer and a pressure reducing valve to reduce line pressure to 10 to 15
psi.
In the case of a gas installation, the boiler should be installed such that the gas
ignition system components are protected from water (dripping, spraying, etc.) during
appliance operation and service (circulator replacement, condensate trap, control
replacement, etc.).
If the boiler is to be used in conjunction with a chilled water system, it must be
piped with the appropriate valves to ensure the chilled medium does not enter the
boiler. If the boiler is connected to heating coils in an air handling system, where the
coils could be exposed to cold air circulation, provisions for freeze protection control
must be installed. The boiler must have flow control valves or other automatic means
to prevent gravity circulation of the boiler water during the cooling cycle.
NOTE: If the heating system is to be filled with antifreeze, use only formulations
expressly made for hydronic heating systems (such as propylene glycol). Do not use
automotive types of antifreeze (ethylene glycol). Use of antifreeze will alter system
output and characteristics. Consult a factory representative for details or assistance.
