Weil-McLain GOLD CGt Manual page 25

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
piping —
for radiant heating or converted gravity systems
Figure 20
Zoning with circulators
ZONE 2
ZONE 1
1
12" max
4a
2
1
6
7b
7a
8
11
Cold
water
fill
12
071022
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 550-110-290/0501
Figure 21
Zoning with zone valves
1
2
4b
3
1
13
6
3-way
valve
10
9
Boiler
circulator
071023
10
11
12
13
ZONE 2
ZONE 1
1
12" max
4a 4b
1
6
7b
7a
8
11
Cold
water
fill
12
Automatic air vent (with diaphragm-type
expansion tank), or connect to tank fitting (closed-
type expansion tank).
DO NOT
vent when using 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
page 21.)
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
5
1 3
13
6
3-way
valve
10
9
Boiler
circulator
use an automatic air
,
Figure 17
25