Part number 550-142-058/0811
WM97+ gas-fired water boiler — Boiler Manual
4
Contents
The WM97+ Gas-fired water boiler . . . . . . . . . . . .2
Please read before proceeding . . . . . . . . . . . . . .5
Boiler location . . . . . . . . . . . . . . . . . . . . . .6
Wall-mounting the boiler . . . . . . . . . . . . . . . . .8
Boiler hydrostatic test . . . . . . . . . . . . . . . . . 10
Converting boiler to propane . . . . . . . . . . . . . . 12
Gas piping — sizing gas lines . . . . . . . . . . . . . 14
Venting/air piping — general . . . . . . . . . . . . . . 15
Commonwealth of Massachusetts installations . . . . . 18
Vent termination requirements . . . . . . . . . . . . . 19
Boiler room air openings . . . . . . . . . . . . . . . . 20
DIRECT VENT — Sidewall with W-M vent/air plate . . . . 21
DIRECT VENT — Sidewall with separate pipes. . . . . . 23
DIRECT VENT — Sidewall concentric . . . . . . . . . . 25
DIRECT VENT — Vertical with separate pipes . . . . . . 27
DIRECT VENT — Vertical concentric. . . . . . . . . . . 29
Concentric termination, typical (sidewall or vertical) . . 31
Vent and air piping and boiler connections . . . . . . . 32
Install water piping. . . . . . . . . . . . . . . . . . . 33
Install condensate line . . . . . . . . . . . . . . . . . 43
Gas piping . . . . . . . . . . . . . . . . . . . . . . . 44
Field wiring . . . . . . . . . . . . . . . . . . . . . . 45
Wiring diagram — schematic . . . . . . . . . . . . . . 48
Wiring diagram — ladder. . . . . . . . . . . . . . . . 49
EXPRESS SETUP — using default settings. . . . . . . . 50
Control module operation. . . . . . . . . . . . . . . . 52
ESSENTIAL settings . . . . . . . . . . . . . . . . . . 54
Control module settings . . . . . . . . . . . . . . . . 55
BOILER SETTINGS menus.
. . . . . . . . . . . . . . . 56
HEAT SETTINGS menus . . . . . . . . . . . . . . . . . 58
DHW SETTINGS menus . . . . . . . . . . . . . . . . . 61
CIRCULATOR EXERCISING and
FREEZE PROTECTION CIRCULATORS menus . . . . . . . 63
DIAGNOSTIC menu . . . . . . . . . . . . . . . . . . . 64
MAINTENANCE, DATE AND TIME menus . . . . . . . . . 67
Startup — fill the system . . . . . . . . . . . . . . . . 68
Startup — final checks . . . . . . . . . . . . . . . . . 70
Check-out/startup verification . . . . . . . . . . . . . . 74
Annual startup and general maintenance . . . . . . . . 75
Annual startup . . . . . . . . . . . . . . . . . . . . . 76
Troubleshooting . . . . . . . . . . . . . . . . . . . . 82
Maintenance . . . . . . .
. . . . . . . . . . . . . . . 90
Replacement parts . . . . . . . . . . . . . . . . . . . 94
Dimensions . . . . . . . . . . . . . . . . . . . . . 104
Ratings — WM97+ boilers . . . . . . . . . . . . . . 105
Installation and Service Certificate . . . . . . . . . . 106
WM97+ Gas Boiler Data Collection Sheet . . . . . . . 107
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 93, page 95 for part number.
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