Connecting Supply Return PIPING, Water Chilled Medium

CONNECTING SUPPLY AND

RETURN PIPING, WATER CHILLED MEDIUM

1.When the boiler is used in connection with refrigerated system, connect supply and return piping as suggested in figure 14 below.

A.The chilled medium MUST BE IN PARALLEL with the boiler.

B.Use appropriate valves to prevent the chilled medium from entering the heating

boiler.

a.During heating cycle open valves A and B. Close valves C and D.

b.During cooling cycle open valves C and D. Close valves A and B.

C.Maintain a minimum clearance of one inch between combustible materials and hot water pipes.

* Reduced pressure backflow preventer must be present under provisions required by the Environmental Protection Agency, (EPA).

2.When the boiler is connected to heating coils located in air handling units where they may be exposed to refrigerated air circulation, the boiler piping system MUST be supplied with flow control valves or other automatic means to prevent gravity circulation of the boiler water during the cooling cycle.

3.A hot water boiler installed above radiation level must be provided with a low water cutoff device either as a part of the boiler or at the time of boiler installation.

4.Suggested piping for steam heating system can be seen in figure 5 on page 5. Actual piping may vary based on system design and local conditions.

FIGURE 14

PAGE 15

PEG-C specifications

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