Weil-McLain CGS-4E Manual

A SERVICE OF

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Part number 550-110-282/1108

19

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CGs-4E Gas-Fired Water Boiler — Boiler Manual

1 Boilerisolation(balancing)valves

2 Flow/check valve

3 Systemorzonecirculator

4 Systemtemperaturegauges

5 Zonevalve

6 Drainvalve

7 Systemtemperaturevalves(seeinstruc-

tions to the left for adjusting valves)

8 Blendtemperaturegauge

9 Relief valve

10Automatic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 waterlog-

ging 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.)

13Air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.)

Figure 8 Primary/secondary piping

Zoning with circulators

Figure 9 Primary/secondary piping

Zoning with zone valves

3d Piping — low temp systems (continued)