12
4 - CONNECTING SUPPLY & RETURN PIPING
Circulators in following illustrations are mounted on system supply side, mounting on system return side is also
acceptable practice.
Figure 4-2 - Circulators Mounted on Supply
System, Boiler Used In Configuration with Chiller
System. See Special Conditions, Page 9
PIPING LEGEND:
4.6 Special Conditions
• System piping exposed to freezing conditions: Use
inhibited propylene glycol solutions certified by fluid
manufacturer for use with closed water heating
system. Do not use automotive or ethylene glycol.
Do not expose boiler and piping to freezing
temperatures.
Note
• Boiler installed above radiation level (or as required
by authority having jurisdiction). Integral low water
switch is provided in boiler.
• Boiler used in connection with refrigeration system.
Install piping in parallel with boiler, with appropriate
valves to prevent chilled medium from entering boiler.
• System piping connected to heating coils located in air
handling unit exposed to refrigerated air circulation.
Install flow control valves or other automatic means
to prevent gravity circulation of boiler water during
cooling cycle.
PN 240012809, Rev. C [11/15/2020]