Weil-McLain Gold CGi Series 2 User Manual page 27

Boiler Manual
boiler-bypass (alternate) piping —
for radiant heating or converted gravity systems
Figure 22 Boiler-bypass piping
Zoning with circulators
(Alternative to primary/secondary piping
Figures 20 and 21)
ZONE 2
ZONE 1
1
4a
2
1
6
7a
9
11
Cold
water
fill
12
Boiler isolation (balancing) valves
1
Flow/check valve
2
System or zone circulator
3
System temperature gauges
4
Zone valve
5
Drain valve
6
System temperature valves (see instructions to the left
7
for adjusting valves)
Blend temperature gauge
8
Relief valve
9
Part Number 550-110-710/0200
1
2
4b
3
13
1
6
8
7b
10
MODEL
CGi
71024
Figure 23 Boiler-bypass piping
Zoning with zone valves
(Alternative to primary/secondary piping
Figures 20 and 21)
ZONE 2
ZONE 1
1
6 Alternate
circulator
location
7a
7b
9
4a
11
Cold
water
fill
12
3
Automatic air vent (with diaphragm-type
10
expansion tank), or connect to tank fitting (closed-
type expansion tank).
DO NOT
air vent when using closed-type expansion tank. It
would allow air to leave the system, causing
waterlogging of the expansion tank.
Fill valve
11
Diaphragm-type or bladder-type expansion tank,
12
if used (For closed-type expansion tank, pipe from
top of air separator to tank fitting as in
page 21).
Air separator and automatic vent, if used (Note that
13
the fill valve must always be connected to the
expansion tank, regardless of location of expansion
tank, circulator or air separator.)
1
5
4b
13
6
8
10
MODEL
CGi
71025
use an automatic
Figure 17,
27