Weil-McLain 550-110-260/0107 manual 3e Water piping — refrigeration systems

GOLD CGs Gas-Fired Water Boiler — Boiler Manual

3d Piping — low temp systems (continued)

Figure 12 System-bypass piping

Zoning with zone valve or circulators, return water 130°F or higher. (Alternative to boiler-bypass piping Figures 10 and 11, page 21)

3 System or zone circulator

7 System temperature valves (see instructions to the left for adjusting valves)

8 Blend temperature gauge

9 Relief valve

10 Automatic air vent (with diaphragm-type expan- sion tank), or connect to tank fitting (closed-type expansion tank). DO NOT use an automatic air vent when using closed-type expansion tank. It would allow air to leave the system, causing waterlogging of the expansion tank.

11 Fill valve

12 Diaphragm-type or bladder-type expansion tank, if used (For closed-type expansion tank, pipe from top of air separator to tank fitting as in Figure 5, page 15.)

3e Water piping — refrigeration systems

Prevent chilled water from entering

Figure 13  Piping refrigeration systems

Install boiler so that chilled medium is piped in parallel with the heating boiler. Use appropriate valves to prevent chilled medium from entering boiler. See Figure 13 for typical installation of balancing valve and check valve.

If boiler is connected to heating coils located in air han- dling units where they can be exposed to refrigerated air, use flow control valves or other automatic means to prevent gravity circulation during cooling cycle.

Part number 550-110-260/0107

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