Weil-McLain WM97+70 Specifications Page 16
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Part number 550-142-120/0113
WM97+ gas-fired water boiler — Boiler Manual
– 16 –
Converting boiler to propane — WM97+155
Prepare boiler for propane —
WM97+155 only
(when required)
Propane operation
ALL WM97+ boilers must be converted for
propane operation
.
Converting an existing natural gas-fired boiler
for propane
— For a boiler already installed, you
must turn off gas supply, turn off power and allow
boiler to cool before proceeding. You must also
completely test the boiler after conversion to verify
performance and start up the boiler following in-
structions beginning on page 87 of this manual.
Verify propane gas orifice size — See Figure 11.
Verify when installing that the orifice size marking
is correct. Orifice will be stamped as in illustration.
Failure to comply could result in severe personal
injury, death or substantial property damage.
Installing propane orifice —
WM97+155 only
If boiler is already installed — You must turn off elec-
trical supply to the boiler and close the external manual
gas shut-off valve to isolate the boiler during conversion.
Allow the boiler to cool if it has been operating.
Following conversion of an installed boiler, follow all
instructions in this manual to start up the boiler and
verify operation of the boiler and all system components.
1. Locate the propane orifice from the propane conversion kit bag.
2. Verify that the stamping on the orifice is correct for the model size
(see Figure 11).
3. If the jacket front door is not already removed, remove it.
4. See Figure 12, page 17 and Figure 13, page 17 for the following.
Figure 11 Propane gas orifice identification
WM97+155
The jacket door must be in place during opera-
tion.
DO NOT operate the boiler with the jacket
door removed except for inspection and testing as
directed in this manual.
Support the gas valve after disconnect-
ing from the venturi. DO NOT allow it
to hang from the gas valve flex line.
When re-attaching the gas valve, ensure the
gas valve grommet (item 8, Figure 13) is in
place and in good condition. Inspect the gas
valve flex line to ensure it is undamaged and
in good condition.
5. Locate the gas valve and venturi (items 1 and 3).
6. Release the gas line to silencer bracket (item 6) from the
gas line and rotate it forward out of the way.
7. Use a 5-mm hex wrench to remove the three Allen screws
(item 2) that secure the gas valve to the venturi.
8. See Figure 13, page 17. Carefully pull the gas valve to
the right until it is free of the venturi. Securely support
the gas valve — DO NOT leave it dangling.
9. Insert the propane gas orifice (item 7) into the gas valve
opening as shown in Figure 13, page 17.
10. Make sure that the rubber grommet (item 8) is firmly
seated in the gas valve opening.
When re-attaching the gas valve, ensure the gas
valve grommet (item 8, Figure 13) is in place
and in good condition. Failure to comply will
cause a gas leak, resulting in severe personal
injury or death.
11. Reposition gas valve onto the venturi and reinstall the
gas valve retention screws (item 2).
- 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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