Specifications

Part number 550-142-120/0113
WM97+ gas-fired water boiler — Boiler Manual
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Contents
The WM97+70 & 110 Gas-fired water boilers . . . . . . . . . 2
The WM97+155 Gas-fired water boiler . . . . . . . . . . . . 4
Please read before proceeding . . . . . . . . . . . . . . . . 7
Boiler location . . . . . . . . . . . . . . . . . . . . . . . . . 8
Wall-mounting the boiler. . . . . . . . . . . . . . . . . . . 10
Boiler hydrostatic test . . . . . . . . . . . . . . . . . . . . 12
Converting boiler to propane — WM97+70/110 . . . . . . 14
Converting boiler to propane — WM97+155 . . . . . . . . 16
Gas piping — sizing gas lines . . . . . . . . . . . . . . . . 18
Venting/air piping — general . . . . . . . . . . . . . . . . 19
Commonwealth of Massachusetts installations . . . . . . 22
Vent termination requirements . . . . . . . . . . . . . . . 23
Boiler room air openings. . . . . . . . . . . . . . . . . . . 24
DIRECT VENT — Sidewall with W-M vent/air plate . . . . . 25
DIRECT VENT — Sidewall with separate pipes . . . . . . . 27
DIRECT VENT — Sidewall concentric . . . . . . . . . . . . 29
DIRECT VENT — Vertical with separate pipes. . . . . . . . 31
DIRECT VENT — Vertical concentric. . . . . . . . . . . . . 33
Concentric termination, typical (sidewall or vertical). . . . 35
Vent and air piping and boiler connections . . . . . . . . . 36
Install water piping . . . . . . . . . . . . . . . . . . . . . 37
Internal water piping — WM97+70 and 110 . . . . . . . . 40
Internal water piping — WM97+155 . . . . . . . . . . . . 41
Expansion tank — WM97+70 and 110 . . . . . . . . . . . 42
Expansion tank — WM97+155 . . . . . . . . . . . . . . . 43
System piping . . . . . . . . . . . . . . . . . . . . . . . . 44
Multiple boiler installations . . . . . . . . . . . . . . . . . 56
Install condensate line . . . . . . . . . . . . . . . . . . . . 62
Gas piping . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Field wiring . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Wiring diagram — schematic . . . . . . . . . . . . . . . . 67
Wiring diagram — ladder . . . . . . . . . . . . . . . . . . 68
EXPRESS SETUP — using default settings . . . . . . . . . 69
WM97+ control operation . . . . . . . . . . . . . . . . . . 71
ESSENTIAL settings . . . . . . . . . . . . . . . . . . . . . 73
WM97+ control settings . . . . . . . . . . . . . . . . . . . 74
BOILER SETTINGS menus . . . . . . . . . . . . . . . . . . 75
HEAT SETTINGS menus . . . . . . . . . . . . . . . . . . . . 77
DHW SETTINGS menus . . . . . . . . . . . . . . . . . . . . 80
CIRCULATOR EXERCISING and
FREEZE PROTECTION CIRCULATORS menus . . . . . . . . . 82
DIAGNOSTIC menu . . . . . . . . . . . . . . . . . . . . . . 83
MAINTENANCE, DATE AND TIME menus . . . . . . . . . . . 86
Startup — fill the system . . . . . . . . . . . . . . . . . . 87
Startup — final checks . . . . . . . . . . . . . . . . . . . 89
Check-out/startup verification. . . . . . . . . . . . . . . . 94
Annual startup and general maintenance . . . . . . . . . . 95
Annual startup . . . . . . . . . . . . . . . . . . . . . . . . 96
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . 102
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . .110
Cleaning heat exchanger flue side, 70/110 . . . . . . . . .112
Cleaning heat exchanger flue side, 155 . . . . . . . . . . .115
Replacement parts . . . . . . . . . . . . . . . . . . . . . . 118
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Ratings — WM97+ boilers. . . . . . . . . . . . . . . . . . 133
Ratings — Multiple WM97+ boilers . . . . . . . . . . . . . 134
Installation and Service Certificate . . . . . . . . . . . . .135
WM97+ Gas Boiler Data Collection Sheet . . . . . . . . . .136
DO NOT SERVICE THE
BOILER WITHOUT A WM97+
MAINTENANCE KIT AVAILABLE
The WM97+ maintenance kit includes components that
may have to be replaced when accessing or disassembling
parts of the boiler. Failure to replace damaged components
and to use only the parts specifically intended for the boiler
can result in severe personal injury, death or substantial
property damage. See Figure 123, page 119 for part number.