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WM97+
-
gas
fired water boiler
Ratings — Multiple WM97+ boilers
Figure 138
Ratings and engineering data — multiple WM97+ boilers
Boilers in
Total
system
CSA input
Model WM97+
Input,
MBH
70
110 155
-
2
140
2
220
2
310
3
210
3
330
3
465
4
280
4
440
4
620
5
350
5
550
5
775
6
420
6
660
6
930
7
490
7
770
7
1085
8
560
8
880
8
1240
Boiler
Shipping
Operating
Model
weight
weight
WM97+
Pounds
Pounds
per boiler
per boiler
Note 4
70
136
140
110
136
140
155
162
150
– 134 –
— Boiler Manual
CSA
Boiler
Net water
Output /
H.P.
ratings
DOE
Heating
capacity
Output,
-
MBH
MBH
Note 1
-
Note 2
130
3.9
114
202
6.0
176
286
8.5
248
195
5.8
171
303
9.1
264
429
12.8
372
260
7.8
228
404
12.1
352
572
17.1
496
325
9.7
285
505
15.1
440
715
21.4
620
390
11.7
342
606
18.1
528
858
25.6
744
455
13.6
399
707
21.1
616
1001
29.9
868
520
15.5
456
808
24.1
704
1144
34.2
992
Water
Water flow rate
Vent/air pipe
content
per boiler
size:
(Provide a
separate
vent for each
GPM
GPM
Gallons
boiler)
@ 20°F
@ 40°F
per boiler
rise
rise
Note 5
2.8
6.5
3.3
2" or 3"
2.8
10.0
5.0
2" or 3"
3.4
14.3
7.2
Manifolded
combustion
air duct
size
1
Square
inches
Figure 64, page 56
2
70
110
155
105
3
165
233
140
4
220
310
175
275
388
210
330
465
245
5
385
543
280
440
620
Electrical
service
required
Amps
per boiler
Note 3
15.0
15.0
3"
15.0
DOE
Notes
Based on standard test procedures outlined by
DOE for individual boilers.
Net I=B=R ratings are based on piping and
pickup allowance of 1.15.
Consult Weil-McLain Technical Services for
other allowances.
Total amp requirement includes up to three
circulators, not exceeding 2.2 amps per
circulator.
Operating weight is the total weight of the
boiler, including water.
WM97+70 or 110 vent/air pipes can be either
2" or 3" pipe.
WM97+155 vent/air pipes must be 3".
All of the boilers will automatically de-rate
as vent/air pipe length increases, due to
the pressure loss through the piping. See
Figure 137, page 133 for details.
All WM97+ installations require a separate
vent pipe and termination for each boiler.
Vent piping cannot be manifolded
and terminate vents as described in vent/air
installation instructions in this manual.
Combustion air piping can be individually
piped or manifolded. See Figure 64, page 56,
for manifolded air piping.
Part number 550-142-120/0113
. Install
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