Weil-McLain WM97+70 Specifications download pdf (Page 134)

Part number 550-142-120/0113

WM97+ gas-fired water boiler — Boiler Manual

– 134 –

Figure 138 Ratings and engineering data — multiple WM97+ boilers

DOE

Boilers in

system

Model WM97+

Total

CSA input

CSA

Output /

DOE

Heating

capacity

Boiler

H.P.

Net water

ratings

Manifolded

combustion

air duct

size

Input,

MBH

Output,

MBH

- MBH

Square

inches

70 110 155

- Note 1 - Note 2 Figure 64, page 56

2 140 130 3.9 114 70

2 220 202 6.0 176 110

2 310 286 8.5 248 155

3 210 195 5.8 171 105

3 330 303 9.1 264 165

3 465 429 12.8 372 233

4 280 260 7.8 228 140

4 440 404 12.1 352 220

4 620 572 17.1 496 310

5 350 325 9.7 285 175

5 550 505 15.1 440 275

5 775 715 21.4 620 388

6 420 390 11.7 342 210

6 660 606 18.1 528 330

6 930 858 25.6 744 465

7 490 455 13.6 399 245

7 770 707 21.1 616 385

7 1085 1001 29.9 868 543

8 560 520 15.5 456 280

8 880 808 24.1 704 440

8 1240 1144 34.2 992 620

Boiler

Model

WM97+

Shipping

weight

Operating

weight

Water

content

Water ﬂow rate

per boiler

Vent/air pipe

size:

(Provide a

separate

vent for each

boiler)

Electrical

service

required

Pounds

per boiler

Pounds

per boiler

Gallons

per boiler

GPM

@ 20°F

rise

GPM

@ 40°F

rise

Amps

per boiler

Note 4 Note 5 Note 3

70

136 140 2.8 6.5 3.3 2” or 3” 15.0

110

136 140 2.8 10.0 5.0 2” or 3” 15.0

155

162 150 3.4 14.3 7.2 3” 15.0

Ratings — Multiple WM97+ boilers

Notes

1

Based on standard test procedures outlined by

DOE for individual boilers.

2

Net I=B=R ratings are based on piping and

pickup allowance of 1.15.

Consult Weil-McLain Technical Services for

other allowances.

3

Total amp requirement includes up to three

circulators, not exceeding 2.2 amps per

circulator.

4

Operating weight is the total weight of the

boiler, including water.

5

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. Install

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.

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