Install Instructions

CG i GAS-FIRED wATER BOILER- sERIEs a- Boiler Manual
4d Piping - low temperature systems <conl inued )
From system
8
To system
Aft~~~~
t:lrcu/4tor
locstlon
II
Figure 24 System-bypass piping - Zoning with
zone val
ve or circulators, return water
130"F or higher - (Aitematlve to boiler-
bypass piping Fi gures 22 and 23)
3 System or zone circulator
7 System temperature valves (see instructions to
the
left for ad justing valves)
8 Blend te
mperatur e gauge
9 Relief valve
10 Automatic air vent (with diaphra~m - type expan-
sion tank), or connect to tank fittmg (closed-type
expansion tank).
DO NOT use an aut om atic air vent
when using
dosed -type expansion tank. It wou ld
allow air to leave the system, causing waterlogging
of th e expansi on tank.
11 Fill valve
12 Diaphragm-type or bladder-type expansion tank,
if used (For d osed- type expan sio n tank, pipe from
top
of air separator to tank fitting as in Rgure 17,
page 21.)
4e Water piping- refrigeration system
Figure 25 Piping refrigeration systems
System
:I I
Expansion tank
supply
I
-
- -T•
t
Sh ut - off
Circu lator
(-<
valve
Water
ch iller
t
; Strainer
C
he ek
Bo iler B:l
•
valve
II
Sys tem
t
return
-
-
Ba lancing
) 1 (1»
va l ve
Part Number 550-142-780/0712
Prevent chilled water from
entering boiler
In st all boiler so that chilled medium is piped in parallel
w
it h the heating bo il er. Use a pp r op riate valves to prevent
chilled
medimn from entering boiler. See Figure 18 for
typical installation
of balancing va lve and check valve.
If boiler is co nn ec ted to heating co ils located in air han-
dling units where they can be exposed to refrige rat ed
air, u se flow co ntr ol va lves or o ther aut omatic means to
prevent gravi ty circulati on dur ing cooling cycle.
29