Install Instructions

Part Number 550-142-902/1016
CGi
GAS-FIRED WATER BOILER — SERIES 3 — Boiler Manual
25
4d
Piping — low temperature systems (continued)
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 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.)
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 20 Primary/secondary piping
Zoning with circulators
Figure 21 Primary/secondary piping
Zoning with zone valves