Weil-McLain WM97+70 Specifications Page 61
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WM97+ gas-fired water boiler — Boiler Manual
Legend — Figure 70
The boiler internal primary/secondary by-pass valve must be CLOSED for multiple boiler installations
piped as shown in this manual. This allows the boiler internal circulator to circulator water to and from the manifolds.
1 Flow/check valve (integral to each
boiler internal circulator)
2 Isolation valves (when used)
3 Cap
4 Easy-Fit® Manifold (supply) —
layout and size per page 57
5 Easy-Fit® Manifold (return) —
layout and size per page 57
6a Heating system circulator (ex-
changer tube-side)
6b Heat exchanger shell-side circulator
7 Expansion tanks (diaphragm type)
8 System air eliminator
9 System automatic air vent
13 Cold water supply connections
17 Boiler circulator — circulates water
between boiler and Easy-Fit® Manifolds
18 Heating system supply
19 Heating system return
20 Boiler relief valve and discharge piping,
installed per WM97+ Boiler Manual
Notes:
1. Contact heat exchanger manufacturer for heat exchanger
shell-side and tube-side piping and circulator require-
ments. Tube-side flow and temperatures must meet
heating system requirements.
2. Contact heat exchanger manufacturer for sizing heat
exchanger.
3. Heat exchanger shell-side circuit requires its own expan-
sion tank as shown.
4. Heating system circuit requires its own expansion tank,
as shown, plus its own relief valve set to protect heating
system and heat exchanger piping and components.
5. When individual isolation valves are used, individual
boiler and level controls may be required.
Figure 70 Piping layout — typical piping for multiple WM97+ boilers, using isolation exchanger (shown using
WM97+155 boilers — adjust boiler connections as required for other boiler models)
Use isolation heat
exchanger for:
1. Large volume systems with high
mineral content in water.
2. Systems exposed to untreated
quantities of makeup water.
3. Old systems severely contami-
nated with scale and rust buildup
inside piping and heat distribu-
tion units.
4. Process applications.
5. Commercial service water ap-
plications.
6. High water pressure applications,
requiring pressure relief setting
in heating system more than 30
PSIG (tall buildings). See notes
below.
Multiple boiler installations
(continued)
Heat exchanger type —
The illustration shows a
shell and tube exchanger.
Other exchanger types
may be used if suitable for
the system water condi-
tions.
- 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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