Weil-McLain WM97+70 Specifications Page 133
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WM97+ gas-fired water boiler — Boiler Manual
Ratings — WM97+ boilers
Figure 137 Ratings and engineering data — WM97+70/110/155
DOE
Boiler
Model
WM97+
CSA
Output /
DOE
Heating
capacity
CSA
Input
Net
I=B=R
water
rating
DOE
Seasonal
Efficiency
Boiler
Water
Content
Vent/
Comb. Air
Connection
Diameter
% Input derate vs vent length
(Values shown are at MAX vent/air
pipe length —
See Note 6)
Direct Vent Venting ONLY
Shipping
Weight
Operating
Weight
Btuh
(Note 2)
Btuh
(Note 5)
Btuh
(Note 3)
AFUE, %
(Note 1)
Gallons
Inches
(Note 4)
Natural gas Propane
Pounds Pounds
2”
Vent/air
piping
3”
Vent/air
piping
2”
Vent/air
piping
3”
Vent/air
piping
70-CT
65,000 70,000 57 95.2 2.8 3" PVC 12 % 5 % 12 % 5 % 162 140
110-CT
101,000 110,000 88 95.0 2.8 3" PVC 15 % 5 % 15 % 5 % 162 140
155-CT
143,000 155,000 124 95.1 3.4 3” PVC N/A 5 % N/A 5 % 162 150
Notes
1
As an Energy Star Partner, Weil-McLain
has determined that WM97+ boilers
meet the Energy Star guidelines for
energy efficiency.
NOTE: Adjusting boiler firing rate will
affect AFUE rating.
2 Based on standard test procedures
prescribed by the United States Depart-
ment of Energy. Ratings also referred to
as CSA Output.
NOTE that only DOE Heating Capacity
and AFUE are certified by AHRI. AFUE
is also know as Annual Fuel Utilization
Efficiency or Seasonal Efficiency.
3 Net I=B=R ratings are based on net
installed radiation of sufficient quantity
for the requirements of the building
and nothing need be added for normal
piping and pickup. Ratings are based
on a piping and pickup allowance of
1.15. An additional allowance should
be made for unusual piping and pickup
loads.
4 WM97+ boilers must be direct-vented.
WM97+ boilers require special venting,
consistent with Category IV boiler. Use
only the vent materials and methods
specified in this manual.
WM97+70 or 110 vent/air pipes can be
either 2” or 3”
WM97+155 vent/air pipes must be 3”
All vent and air pipe elbows must
be sweep elbows, NOT short-radius
elbows.
5 Ratings shown are for sea level ap-
plications only. For altitudes from sea
level to 5,500 feet above sea level, the
WM97+ boiler requires no modifica-
tions and automatically derates itself by
approximately 4% per 1000 feet above
sea level.
6 All of the boilers will automatically
de-rate as vent/air pipe length increases,
due to the pressure loss through the
piping. For vent/air pipe lengths less
than the maximum, the derate equals
the value above times vent length ÷ 100.
THE OUTDOOR SENSOR SUPPLIED WITH THE BOILER MUST BE INSTALLED UNLESS EXEMPTED BELOW:
IMPORTANT
In accordance with Section 303 of the
2007 Energy Act
, this boiler is equipped
with a feature that saves energy by re-
ducing the boiler water temperature as
the heating load decreases. This feature
is equipped with an override which is
provided primarily to permit the use of
an external energy management system
that serves the same function.
THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST ONE OF THE
FOLLOWING CONDITIONS IS TRUE:
• An external energy management system is installed that reduces the boiler water tem-
perature as the heating load decreases.
• This boiler is not used for any space heating.
• This boiler is part of a modular or multiple boiler system having a total input of 300,000
BTU/hr or greater.
• This boiler is equipped with a tankless coil (not applicable to WM97+).
- Boiler Manual 1
- Contents 6
- Please read before proceeding 7
- Boiler location 8
- Boiler location (continued) 9
- Wall-mounting the boiler 10
- (continued) 11
- Boiler hydrostatic test 12
- (see legend at right) 13
- (see legend below) 13
- Part number 550-142-120/0113 14
- (cont.) 15
- Gas piping — sizing gas lines 18
- Venting/air piping — general 19
- Vent termination requirements 23
- Boiler room air openings 24
- Sidewall with separate pipes 27
- Sidewall concentric 29
- Vertical with separate pipes 31
- Vertical concentric 33
- Prepare roof penetrations 34
- Mount concentric termination 34
- USE SWEEP ELBOWS FOR ALL 36
- VENT AND AIR PIPING — DO NOT 36
- Install water piping 37
- WM97+70 or 110 only 40
- WM97+155 only 41
- Existing expansion tanks 42
- Expansion tank — WM97+155 43
- System piping (continued) 45
- Multiple boiler installations 56
- Install condensate line 62
- Gas piping 63
- Field wiring 64
- Field wiring (continued) 65
- Wiring diagram — schematic 67
- Wiring diagram — ladder 68
- ONLY if the system meets the 69
- WM97+ control operation 71
- WM97+ control settings 74
- BOILER SETTINGS menus 75
- HEAT SETTINGS menus 77
- DHW SETTINGS menus 80
- CIRCULATOR EXERCISING and 82
- DIAGNOSTIC menu 83
- DIAGNOSTICS menu (continued) 84
- MAINTENANCE INFO 86
- Startup — fill the system 87
- Freeze protection (if used) 88
- Startup — final checks 89
- 70 or 110 89
- Check water piping 90
- Check gas piping 90
- Check-out/startup verification 94
- Owner maintenance 95
- Service technician 95
- Annual startup 96
- Annual startup (continued) 100
- Troubleshooting 102
- Troubleshooting (continued) 103
- Maintenance 110
- Inspect and clean the burner 112
- Tools required 112
- Before proceeding: 112
- Cleaning the WM97+155 heat 115
- Replacement parts 118
- Replacement parts (continued) 119
- Dimensions 132
- Ratings — WM97+ boilers 133
- HIGH __ MED __ LOW __OFF __ 135
- HIGH __ LOW __ MED __OFF __ 136
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