Weil-McLain Gold CGi Series 2 User Manual page 25

Boiler Manual
primary/secondary (preferred) bypass piping —
for radiant heating or converted gravity systems
Figure 20
Zoning with circulators
ZONE 2
ZONE 1
1
4a
12"
2
MAX.
1
6
7a
8
9
11
Cold
water
fill
12
Boiler isolation (balancing) valves
1
2 Flow/check valve
System or zone circulator
3
System temperature gauges
4
Zone valve
5
Drain valve
6
System temperature valves (see instructions to the
7
left for adjusting valves)
Blend temperature gauge
8
Relief valve
9
Part Number 550-110-710/0200
Figure 21
Zoning with zone valves
1
2
4b
3
1
13
6
7b
Alternate
circulator
location
10
MODEL
CGi
71022
10
11
12
13
ZONE 2
ZONE 1
1
4a
12"
MAX.
1
7b
6
7a
8
9 10
11
Cold
water
fill
12
Automatic air vent (with diaphragm-type expansion
tank), or connect to tank fitting (closed-type expansion
tank). use an automatic air vent when using
DO NOT
closed-type expansion tank. It would allow air to leave
the system, causing waterlogging of the expansion tank.
Fill valve
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
Air separator and automatic vent, if used (Note that
the fill valve must always be connected to the expansion
tank, regardless of location of expansion tank,
circulator or air separator.)
1
4b
5
3
13
1
6
Alternate
circulator
location
MODEL
CGi
71023
.)
Figure 17
25