Weil-McLain EG manual Bypass piping, Use with refrigeration systems, Multiple Zoning

2 EG, PEG, EGH GAS-FIRED BOILERS — SERIES 4 — BOILER MANUAL

Piping connections (continued)

8.Multiple Zoning

a)Zone valves:

Refer to zone valve manufacturer’s literature for wiring and application. A separate transformer is required to power zone valves.

Provide balancing valves to adjust the flow so it is about the same in each zone.

b)Circulators:

Zoning with circulators requires a relay for each circulator. Install flow control valves to prevent gravity circulation. Provide balancing valves to adjust the flow so it is about the same in each zone.

9.If system is to be ASME inspected and approved, an additional high temperature limit is needed. Purchase and install the control in supply outlet piping from boiler.

Bypass piping

BYPASS PIPING IS NOT NORMALLY REQUIRED ON

ANY BASEBOARD SYSTEM

Bypass piping should be used for the following installations. Bypass, supply, and return piping should be same size.

1.See Figure 12 to protect:

•radiant panels, plaster, etc. from high temperature water supplied from boiler, or

•boiler from condensation caused by low temperature water returned from system.

2.See Figure 13 to protect boiler from condensation formed by low water temperature returned from large water content converted gravity systems, etc.

Use with refrigeration systems

The boiler must be installed so that chilled medium is piped in parallel with the heating boiler with appropriate valves to prevent the chilled medium from entering the boiler. See Figure 14. Consult I=B=R Installation and Piping Guides.

If boiler is connected to heating coils located in air handling units where they can be exposed to refrigerated air,gravity circulation during the cooling cycle must be prevented with flow control valves or other automatic means.

Figure 12

Figure 13

10 Part Number 550-110-639/0703