ECR International UTICA HEATING UH15B-K Installation, Operation & Maintenance Manual page 13

Do not expose boiler and piping to freezing
Note
temperatures.
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.
Circulators in following illustrations are mounted on system supply side, mounting on system return side is also
acceptable practice.
Figure 4-4 - Circulators Mounted on Supply System, Boiler Used In Configuration with Chiller
System. See Special Conditions, Page 10
4 - CONNECTING SUPPLY & RETURN PIPING
PIPING LEGEND:
BACK FLOW VALVE
• 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.
13
DRAIN
PN 240013259 Rev. D [08/15/2021]