Weil-McLain WM97+70 Specifications

This manual must only be used by a qualified heating installer/service technician. Read all instructions, includ-ing this manual and all other inform

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 10 –Wall-mounting the boilerRemove boiler from crate The boiler is heavy. U

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 100 –Annual startup (continued)Check blower speeds1. For installations at a

Part number 550-142-120/0113– 101 –WM97+ gas-fired water boiler — Boiler ManualCheck boiler relief valve1. Inspect the relief valve and lift the leve

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 102 –TroubleshootingBEFORE TROUBLESHOOTING —BEFORE TROUBLESHOOTING —1. See

Part number 550-142-120/0113– 103 –WM97+ gas-fired water boiler — Boiler ManualTroubleshooting (continued)Check WM97+ control fuses ALWAYS check WM97

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 104 –Figure 112 WM97+ control display toggles when in lockout, with scree

Part number 550-142-120/0113– 105 –WM97+ gas-fired water boiler — Boiler ManualTroubleshooting (continued)Figure 113 Troubleshooting suggestions fo

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 106 –Troubleshooting (continued)DisplayCondition Diagnostics Corrective Acti

Part number 550-142-120/0113– 107 –WM97+ gas-fired water boiler — Boiler ManualTroubleshooting (continued)DisplayCondition Diagnostics Corrective Acti

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 108 –Troubleshooting (continued)DisplayCondition Diagnostics Corrective Acti

Part number 550-142-120/0113– 109 –WM97+ gas-fired water boiler — Boiler ManualDisplayCondition Diagnostics Corrective Action(s)BLOWER FAULT Blower un

Part number 550-142-120/0113– 11 –WM97+ gas-fired water boiler — Boiler ManualWall-mounting the boiler (continued)Figure 5 Place boiler on wall-mount

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 110 –MaintenanceDisconnect power Electrical shock hazard — Disconnect all e

Part number 550-142-120/0113– 111 –WM97+ gas-fired water boiler — Boiler ManualMaintenance (continued)Cleaning the heat exchanger WATER SIDE, when req

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 112 –Cleaning heat exchanger flue side, 70/110Cleaning the WM97+70 or 110 hea

Part number 550-142-120/0113– 113 –WM97+ gas-fired water boiler — Boiler ManualFigure 119 Accessing the burner or heat exchanger (see Legend on next p

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 114 –Cleaning heat exchanger flue side, 70/110 (continued)•swirltheburner

Part number 550-142-120/0113– 115 –WM97+ gas-fired water boiler — Boiler ManualCleaning heat exchanger flue side, 155Cleaning the WM97+155 heat exchang

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 116 –Inspect refractory and replace burner gasket 1. See Figure 121, page 1

Part number 550-142-120/0113– 117 –WM97+ gas-fired water boiler — Boiler ManualCleaning heat exchanger flue side, 155 (continued)Figure 121 Accessing t

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 118 –Replacement parts DO NOT SERVICE THE BOILER WITHOUT A WM97+ MAINTENANC

Part number 550-142-120/0113– 119 –WM97+ gas-fired water boiler — Boiler ManualFigure 123 Miscellaneous parts and kitsReplacement parts (continued)G

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 12 –Boiler hydrostatic test DO NOT install a relief valve with a pressure h

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 120 –Replacement parts (continued)Figure 124 Jacket parts — WM97+70/110/15

Part number 550-142-120/0113– 121 –WM97+ gas-fired water boiler — Boiler ManualReplacement parts (continued)Figure 125 Jacket assembly — WM97+70/110

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 122 –Figure 126 Heat exchanger parts WM97+70/110 (see Figure 127, page 123

Part number 550-142-120/0113– 123 –WM97+ gas-fired water boiler — Boiler ManualGo to www.weil-mclain.com to locate Weil-McLain distributorsFigure 127

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 124 –Replacement parts (continued)Figure 128 Heat exchanger parts WM97+155

Part number 550-142-120/0113– 125 –WM97+ gas-fired water boiler — Boiler ManualFigure 129 WM97+155 heat exchanger assembly (see Figure 128, page 124 f

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 126 –Figure 130 Piping components for WM97+70/110 (see Figure 131, page 1

Part number 550-142-120/0113– 127 –WM97+ gas-fired water boiler — Boiler ManualGo to www.weil-mclain.com to locate Weil-McLain distributorsReplacement

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 128 –Figure 132 Piping components for WM97+155 (see Figure 133, page 129 f

Part number 550-142-120/0113– 129 –WM97+ gas-fired water boiler — Boiler ManualGo to www.weil-mclain.com to locate Weil-McLain distributorsReplacement

Part number 550-142-120/0113– 13 –WM97+ gas-fired water boiler — Boiler ManualFigure 6 Install pipe fittings for relief valve and pressure/temperature

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 130 –Figure 134 Controls and electrical components — WM97+70/110/155 (see

Part number 550-142-120/0113– 131 –WM97+ gas-fired water boiler — Boiler ManualGo to www.weil-mclain.com to locate Weil-McLain distributorsReplacement

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 132 –Figure 136 Dimensional data — WM97+70/110/155 (all dimensions in inch

Part number 550-142-120/0113– 133 –WM97+ gas-fired water boiler — Boiler ManualRatings — WM97+ boilersFigure 137 Ratings and engineering data — WM97

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 134 –Figure 138 Ratings and engineering data — multiple WM97+ boilersDOEB

Part number 550-142-120/0113– 135 –WM97+ gas-fired water boiler — Boiler ManualBoiler Start-Up DataBoiler Model / Series WM97+ ________ / Serie

136WM97+ gas-fired water boiler — Boiler ManualCustomer Info: Maintenance Info:Contact: Name:Contractor: Phone:Job name: Model:City, state: CP#:Distri

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 14 –Converting boiler to propane — WM97+70/110Prepare boiler for propane — W

Part number 550-142-120/0113– 15 –WM97+ gas-fired water boiler — Boiler ManualFigure 10 Installing the propane gas orifice bushing (some details omitt

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 16 –Converting boiler to propane — WM97+155Prepare boiler for propane — WM97

Part number 550-142-120/0113– 17 –WM97+ gas-fired water boiler — Boiler ManualFigure 12 Installing the propane gas orifice bushing (some details omitt

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 18 –Gas piping — sizing gas linesFigure 14 Pipe capacity for 0.60 specific g

Part number 550-142-120/0113– 19 –WM97+ gas-fired water boiler — Boiler Manual You must pipe combustion air to the boiler air intake. Install air in

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 2 –The WM97+70 & 110 Gas-fired water boilers1. Stainless steel firetube h

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 20 –Venting & air — general (cont.)Figure 17 WM97+ venting and air pipi

Part number 550-142-120/0113– 21 –WM97+ gas-fired water boiler — Boiler ManualVenting & air — general (cont.)Figure 18 Vent and air piping materi

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 22 –(a) For all sidewall horizontally-vented gas-fueled equipment installed

Part number 550-142-120/0113– 23 –WM97+ gas-fired water boiler — Boiler ManualVent termination requirementsFigure 19 The vent termination must be loc

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 24 –Figure 20 Combustion and ventilation air openings for WM97+ Direct Vent

Part number 550-142-120/0113– 25 –WM97+ gas-fired water boiler — Boiler ManualDIRECT VENT — Sidewall with W-M vent/air plateAllowable vent/air pipe ma

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 26 – Vent/air pipes and W-M vent/air plate can be oriented in any of the co

Part number 550-142-120/0113– 27 –WM97+ gas-fired water boiler — Boiler ManualDIRECT VENT — Sidewall with separate pipesAllowable vent/air pipe materi

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 28 –DIRECT VENT — Sidewall with separate pipes (continued) All vent pipes a

Part number 550-142-120/0113– 29 –WM97+ gas-fired water boiler — Boiler ManualDIRECT VENT — Sidewall concentricAllowable vent/air pipe materials &

Part number 550-142-120/0113– 3 –WM97+ gas-fired water boiler — Boiler ManualThe WM97+70 & 110 Gas-fired water boiler (cont.)

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 30 –DIRECT VENT — Sidewall concentric (continued)Figure 29 Termination loca

Part number 550-142-120/0113– 31 –WM97+ gas-fired water boiler — Boiler ManualDIRECT VENT — Vertical with separate pipesAllowable vent/air pipe materi

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 32 –Figure 32 Terminations for multiple boilers Also maintain maximum dist

Part number 550-142-120/0113– 33 –WM97+ gas-fired water boiler — Boiler ManualDIRECT VENT — Vertical concentricAllowable vent/air pipe materials &

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 34 –DIRECT VENT — Vertical concentric (continued)2. Place roof penetrations

Part number 550-142-120/0113– 35 –WM97+ gas-fired water boiler — Boiler ManualConcentric termination, typical (sidewall or vertical)Figure 36 PVC con

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 36 –Figure 37 Boiler vent and air connections ADAPTERS — Use adapters if us

Part number 550-142-120/0113– 37 –WM97+ gas-fired water boiler — Boiler ManualInstall water piping Use two wrenches when tightening water piping at b

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 38 –Head loss through boiler internal pipingTop boiler connections (internal

Part number 550-142-120/0113– 39 –WM97+ gas-fired water boiler — Boiler ManualSimplified pipe/circulator selection1. Install the boiler and piping usi

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 4 –The WM97+155 Gas-fired water boiler1. Stainless steel firetube heat exchan

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 40 –Internal water piping — WM97+70 and 110Set primary/secondary by-pass val

Part number 550-142-120/0113– 41 –WM97+ gas-fired water boiler — Boiler ManualInternal water piping — WM97+155Figure 44 WM97+155 internal piping with

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 42 –Supplementary expansion tank, if required — systems having volumes more

Part number 550-142-120/0113– 43 –WM97+ gas-fired water boiler — Boiler ManualExpansion tank — WM97+155Figure 48 WM97+155 external expansion tank pip

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 44 –Figure 50 WM97+70/110 Zone valve zoning — direct connection (boiler cir

Part number 550-142-120/0113– 45 –WM97+ gas-fired water boiler — Boiler ManualSystem piping (continued)Figure 51 WM97+70/110 Zone valve zoning — dire

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 46 –Figure 53 WM97+70/110 Zone valve zoning — primary/secondary connection —

Part number 550-142-120/0113– 47 –WM97+ gas-fired water boiler — Boiler ManualFigure 54 WM97+155 Zone valve zoning — primary/secondary connection — a

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 48 –System piping (continued)Legend — Figure 551 WM97+70 or 110 boiler2 I

Part number 550-142-120/0113– 49 –WM97+ gas-fired water boiler — Boiler ManualFigure 56 WM97+155 Circulator zoning plus optional DHW pipingSystem pipi

Part number 550-142-120/0113– 5 –WM97+ gas-fired water boiler — Boiler ManualThe WM97+155 Gas-fired water boiler (continued)

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 50 –Figure 57 WM97+70/110 Typical radiant heating system piping — circulator

Part number 550-142-120/0113– 51 –WM97+ gas-fired water boiler — Boiler ManualFigure 58 WM97+155 Typical radiant heating system piping — circulator zo

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 52 –Figure 59 WM97+70/110 Circulator zoning with DHW as a zoneSystem piping

Part number 550-142-120/0113– 53 –WM97+ gas-fired water boiler — Boiler ManualFigure 60 WM97+155 Circulator zoning with DHW as a zoneSystem piping (co

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 54 –Figure 61 WM97+70/110 Chilled water system plus optional DHW pipingSyste

Part number 550-142-120/0113– 55 –WM97+ gas-fired water boiler — Boiler ManualFigure 62 WM97+155 Chilled water system plus optional DHW pipingSystem p

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 56 –Multiple boiler installationsPlacing multiple boilers1. Locate multiple

Part number 550-142-120/0113– 57 –WM97+ gas-fired water boiler — Boiler ManualSequencing multiple WM97+ boilers1. Use a multiple-boiler controller, s

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 58 –Legend — Figure 67 The boiler internal primary/secondary by-pass valve

Part number 550-142-120/0113– 59 –WM97+ gas-fired water boiler — Boiler ManualLegend — Figure 68 The boiler internal primary/secondary by-pass valve m

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 6 –ContentsThe WM97+70 & 110 Gas-fired water boilers . . . . . . . . . 2T

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 60 –Suggested DHW boiler-side pipe sizing (for max 0.04 feet head loss per f

Part number 550-142-120/0113– 61 –WM97+ gas-fired water boiler — Boiler ManualLegend — Figure 70 The boiler internal primary/secondary by-pass valve m

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 62 –Install condensate linePrepare condensate trap assembly1. Remove the co

Part number 550-142-120/0113– 63 –WM97+ gas-fired water boiler — Boiler ManualGas piping WM97+ boilers are shipped ready to fire natural gas ONLY. You

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 64 –Field wiring ELECTRICAL SHOCK HAZARD — For your safe-ty, turn off elect

Part number 550-142-120/0113– 65 –WM97+ gas-fired water boiler — Boiler ManualField wiring (continued)Figure 75 WM97+ line voltage input and output co

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 66 –Figure 76 WM97+ low voltage input and output connections (24 VAC) Therm

Part number 550-142-120/0113– 67 –WM97+ gas-fired water boiler — Boiler ManualWiring diagram — schematicFigure 77 WM97+ schematic wiring diagram (see

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 68 –Wiring diagram — ladderFigure 78 WM97+ ladder wiring diagram (see Figur

Part number 550-142-120/0113– 69 –WM97+ gas-fired water boiler — Boiler ManualEXPRESS SETUP — using default settings MANDATORY CONTROL SETTINGS — The

Part number 550-142-120/0113– 7 –WM97+ gas-fired water boiler — Boiler ManualPlease read before proceeding Installer— Read all instructions, includin

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 70 –EXPRESS SETUP — using default settings (continued)Figure 80 Using defau

Part number 550-142-120/0113– 71 –WM97+ gas-fired water boiler — Boiler ManualWM97+ control operation Temperature settings — You must ensure that the

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 72 –WM97+ control operation (continued)Figure 83 WM97+ control display scre

Part number 550-142-120/0113– 73 –WM97+ gas-fired water boiler — Boiler ManualESSENTIAL settings THE CONTROL SETTINGS LISTED BELOW MUST BE MADE BEFOR

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 74 –WM97+ control settingsFigure 84 WM97+ control menu access — accessing

Part number 550-142-120/0113– 75 –WM97+ gas-fired water boiler — Boiler ManualFigure 85 BOILER SETTINGS menus (see Figure 86, page 76 for setting val

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 76 –BOILER MODEL Check the boiler model against the model listed on the boi

Part number 550-142-120/0113– 77 –WM97+ gas-fired water boiler — Boiler ManualHEAT SETTINGS menusSystem type Display Preset temperatures (see next pag

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 78 –HEAT SETTINGS menus (continued)HEAT SETTINGS1. The heat settings menus

Part number 550-142-120/0113– 79 –WM97+ gas-fired water boiler — Boiler ManualHEAT SETTINGS menus (continued)4. Boost will continue until the setpoin

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 8 –Boiler locationInstallations must comply with:• Local, state, provincial

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 80 –DHW SETTINGS menusFigure 90 DHW SETTINGS menus (see Figure 91, page 81

Part number 550-142-120/0113– 81 –WM97+ gas-fired water boiler — Boiler ManualDHW SETTINGS menus (continued)Figure 91 DHW SETTINGS menus (see Figure

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 82 –CIRCULATOR EXERCISING and FREEZE PROTECTION CIRCULATORS menusCIRCULATOR

Part number 550-142-120/0113– 83 –WM97+ gas-fired water boiler — Boiler ManualFigure 93 DIAGNOSTICS menu navigation (see Figure 84, page 74 for acces

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 84 –Menu/Item Units Low ValueHigh ValueDefault CommentTO RESET ALL HISTORY C

Part number 550-142-120/0113– 85 –WM97+ gas-fired water boiler — Boiler ManualFigure 95 DIAGNOSTICS menu details (continued) (see Figure 93, page 83

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 86 –MAINTENANCE, DATE AND TIME menusMaintenance InfoName text blank Contract

Part number 550-142-120/0113– 87 –WM97+ gas-fired water boiler — Boiler ManualStartup — fill the systemAntifreeze1. Use only antifreeze listed by Weil

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 88 –Startup — fill the system (continued)Freeze protection (if used) Follow

Part number 550-142-120/0113– 89 –WM97+ gas-fired water boiler — Boiler ManualStartup — final checks Check for gas leaksBefore starting the boiler, an

Part number 550-142-120/0113– 9 –WM97+ gas-fired water boiler — Boiler ManualProvide clearances for service access — RECOMMENDED1. See Figure 1 for r

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 90 –Startup — final checks (continued)Final checks before starting boiler Re

Part number 550-142-120/0113– 91 –WM97+ gas-fired water boiler — Boiler ManualStartup — final checks (continued)Figure 99 Operating instructions (WARN

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 92 –Startup — final checks (continued) If combustion at either high or low fi

Part number 550-142-120/0113– 93 –WM97+ gas-fired water boiler — Boiler ManualStartup — final checks (continued)Throttle screw adjustment WM97+155 ONLY

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 94 –Check-out/startup verificationAdjust and test boiler controls1. Follow i

Part number 550-142-120/0113– 95 –WM97+ gas-fired water boiler — Boiler ManualAnnual startup and general maintenanceFigure 103 Service and maintena

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 96 –Annual startupHANDLING CERAMIC FIBER MATERIALSREMOVING BURNER GASKET or

Part number 550-142-120/0113– 97 –WM97+ gas-fired water boiler — Boiler ManualAnnual startup (continued) The boiler should be inspected and started a

Part number 550-142-120/0113WM97+ gas-fired water boiler — Boiler Manual– 98 –Annual startup (continued)Check air openings1. Verify that combustion a

Part number 550-142-120/0113– 99 –WM97+ gas-fired water boiler — Boiler ManualAnnual startup (continued)Check ignition wiring1. Check ignition cable