Weil-McLain CGI-4E 4d Piping - low temperature systems continued, 2Flow/check valve, 11Fill valve

GOLD CGi-4E Gas-Fired Water Boiler — Boiler Manual

4d Piping — low temperature systems (continued)

Figure 22 Boiler-bypass piping — Zoning with	Figure 23 Boiler-bypass piping — Zoning with
circulators — (Alternative to primary/	zone valves — (Alternative to primary/
secondary piping Figures 20 and 21)	secondary piping Figures 20 and 21)

1Boiler isolation (balancing) valves

2Flow/check valve

3System or zone circulator

4System temperature gauges

5Zone valve

6Drain valve

7System temperature valves (see in- structions to the left for adjusting valves)

8Blend temperature gauge

9Relief valve

10Automatic air vent (with diaphragm-type expansion 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.

11Fill valve

12Diaphragm-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 17, page 21).

13Air separator and automatic vent, if used (Note that the fill valve must always be connected to the expansion tank, regardless of location of expansion tank, circulator or air separator.)

Part Number 550-110-711/1108 27