Weil-McLain 2 Series Manual page 17

series
GV90+
Install water piping
Zone valve zoning — GV90+3, GV90+4 or GV90+5
Figure 18
(DO NOT apply to GV90+6)
The system must meet the following requirements when applying Figure 18
Figure 19
Boiler Circulator HEAD
model available to the
system
6.4 feet w.c.
GV90+3
@ 6.5 GPM
4.1 feet w.c.
GV90+4
@ 9.7 GPM
5.5 feet w.c.
*
GV90+5
@8.7 GPM
GV90+6 DO NOT apply to GV90+6 — Use primary/secondary piping ONLY, as in
* This application may be marginal. It could cause temperature distribution problems, because the temperature drop is 30°F,
NOT 20°F. The best method is to use primary/secondary piping for the GV90+5 as in
Part number 550-143-010/1021
gas-fired water boiler – boiler manual
2
(continued)
Maximum Minimum
circuit number
length of circuits
L
103 feet 2
92 feet 3
112 feet 3
1 Isolation valves
2 Automatic air vent (with
diaphragm-type expan-
sion tank), or connect to
tank fitting (closed-type
expansion tank).
3 Diaphragm- or bladder-
type expansion tank, if
used. (For closed-type
expansion tank, pipe
from top of air separa-
tor to tank fitting as in
Figure 15, page 14.)
Pipe sizes (NPT), minimum
Boiler model
GV90+3
GV90+4
GV90+5
Circuit requirements
One-pipe diverter tees systems
tion information on this page is based on two-
pipe baseboard systems.
internal circulator can provide sufficient flow
to a one-pipe diverter tee system, use the avail-
able head value given in Figure 19, page 17.
Max load Max feet baseboard
of any of any circuit
circuit (@ 600 Btuh/foot)
40 MBH 67 feet
33 MBH 55 feet
53 MBH 88 feet
Figure 20, page
Legend
4 Zone valve
7 Hose bibb purge valve
8 Boiler pressure/tempera-
ture gauge
10 Differential pressure by-
pass valve
16 Cold water fill line — see
Figure 15, page 14
typical components
Mains Circuits
1" ¾"
1¼" ¾"
See Figure 19
— The applica-
To check whether the
Summary
6.5 GPM total
(max 4 GPM any circuit)
20°F temperature drop
9.7 GPM total
(max 3.3 GPM any circuit)
20°F temperature drop
8.7 GPM
(max 3.5 GPM any circuit)
30°F temperature drop
Figure 20, page 18.
18.
for
17