Specifications

Part number 550-142-120/0113
– 45 –
WM97+ gas-fired water boiler — Boiler Manual
System piping (continued)
Figure 51 WM97+70/110 Zone valve zoning — direct connection
(boiler primary/secondary by-pass valve CLOSED)
Figure 52 The system must meet the following
requirements when applying Figure 51
Boiler model WM97+70 WM97+110
MAIN line size (inches)
[
]
1 1
BRANCH line size
(inches) [
]
¾ ¾
Total FLOW, GPM
6.3 9.9
Boiler internal circulator:
TACO model
007-IFC
0015-MSF2-
IFC
Circulator HEAD (feet)
available to the system
5.0 6.5
Finned-tube baseboard (¾”) applications:
Minimum NUMBER of
circuits
2 3
Maximum FLOW per
circuit, GPM (20°F
temperature drop)
3.5 4.0
Maximum LOAD per
circuit, MBH
35 40
Maximum FEET
of FINNED TUBE
BASEBOARD per loop
(@ 600 BTUH per foot)
58 67
L — Maximum circuit
length, feet (see L–1, L–2
and L–3 in Figure 51)
102 105
Legend — Figure 50, page 44 & Figure 51, page 45
1 WM97+70 or 110 boiler
2 Indirect water heater, if used
(for CWH installations, refer
to the Weil-McLain CWH
manual)
3
Relief valve, supplied with
boiler, field piped — MUST
be piped to boiler supply
connection — see page 13 for
information
4 Relief valve piping to drain —
see page 39
5 DHW circulator
6 Isolation valves
8 Supplementary expansion
tank, diaphragm type, if used
9 Air separator
10 Flow/check valve
11 Purge/drain valves (one drain
valve is supplied loose with the
boiler)
12
Boiler circulator, with inte-
gral flow/check valve, factory
installed in boiler
13 Zone valves
14
Primary/secondary by-pass
valve — see page 40 for infor-
mation — CLOSED: Boiler
circulator provides system
flow
20 Make-up water supply
21 By-pass pressure regulator,
RECOMMENDED for zone
valve systems unless other
provision is made
23 Backflow preventer, if used
25 Pressure reducing valve, if
used
26
Internal expansion tank,
diaphragm-type
27 Quick-fill valve, if used
28
DHW boiler water supply
connection, when used — see
page 13 for information
29
DHW boiler water return
connection, when used — see
page 13 for information
30
Pressure/temperature
gauge, supplied with boiler,
field piped
31 Heating circuits
32 Additional heating circuits, if
any
= Items supplied with boiler
— all other items supplied by
installer
DHW refers to an indirect-fired domestic hot
water storage tank. CWH refers to a Weil-
McLain Companion Water Heater.