Install Instructions

CG i GAS-FIRED wATER BOILER- sERIEs a- Boiler Manual
4d Piping - low temperature systems <conl inued)
Figure 22 Boiler-bypass p ip ing - Zoning with
circulators - (Aitematlve to primary/
secondary piping
Fi gures 20 and 21)
Figure 23 Boiler-bypass piping - Zoning wllh
zone valves - (Alternative to primary/
secondary p ip ing Fi gures 20 and 2 1)
Cold
wat er
••
Effi
I I
1
Boiler isolation (balancing) valves
2 Flow/check va l ve
3 System or zone circulator
4 System temperature gauges
5
Zone va l ve
6
Drain va l ve
7
System temperature valves (see in -
str uctions to the left for adjusting
valves)
8 Blend temperature gauge
r--------------f-zoN"e-2~---------+ , .
! ~-----------J !
' ZONE1 '
f* 1 1 *•
i 5 ~ T -1
: it.....!
~ --- -- +1 ·
6
Cold
-M ~
,.
I I!!!
710 24
71 025
9 Relief valve
10 Automatic ai r 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 all ow 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
d osed-type expansion tank, pi
pe from top of air sep arator to
tank fitting as
in Figure 17. page 21).
13 Air separator and automatic vent, if used (Note that the fill va l ve
must alwa ys be connected to the expan sio n tank, regardless of
location of expansion tank, circulator or air separator.)
Part Number 550-142-780/0712 27