Install Instructions

Part Number 550-142-902/1016
CGi
GAS-FIRED WATER BOILER — SERIES 3 — Boiler Manual
27
Piping — low temperature systems (continued)
4d
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 in-
structions 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 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 17, page 21).
13Air separator and automatic vent, if used (Note that the ll valve
must always be connected to the expansion tank, regardless of
location of expansion tank, circulator or air separator.)
Figure 22 Boiler-bypass piping — Zoning with
circulators — (Alternative to primary/
secondary piping Figures 20 and 21)
Figure 23 Boiler-bypass piping — Zoning with
zone valves — (Alternative to primary/
secondary piping Figures 20 and 21)