Weil-McLain WM97+70 Specifications Page 79
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WM97+ gas-fired water boiler — Boiler Manual
HEAT SETTINGS menus (continued)
4. Boost will continue until the setpoint (target temperature)
reaches the MAX SUPPLY setting.
5. The purpose of boost is to compensate for changes in demand
not addressed by the reset curve. Typically, set boost to 30
minutes. The factory default is “OFF” — that is, boost is not
enabled with default settings.
PRE PUMP TIME
1. The boiler circulator and zone circulators (if activated with
the WM97+ zone circulator outputs) will start this amount
of time before the burner is started.
POST PUMP TIME
1. The boiler circulator and zone circulators (if activated with
the WM97+ zone circulator outputs) will continue this
amount of time after the burner is shut down when the call
for heat is satisfied.
MIN RATE / MAX RATE
1. Use to set minimum and maximum boiler inputs by setting
minimum and maximum blower RPM.
2. This adjustment can be used to match the maximum boiler
output the maximum heat load. This will reduce boiler cycling
and increase boiler/system efficiency.
During combustion testing, the Maximum rate
must be set to the Maximum Rate “High Value” listed
in Figure 89 to allow the boiler to be set to maximum
input during high-fire set-up and testing.
Figure 89 HEAT SETTINGS menus (see Figure 84, page 74 for access information)
Menu/Item Units
Low
Value
High
Value
Default Comment
System Type Types Off Custom FTB
Boiler Circulator Spd Selection Off High Med Select speed or select OFF to deactivate boiler during
space heating call
Max Supply °F 60 190 180 Boiler enters manual reset lockout at 200°F
Min Supply °F 60 190 130 N/A - DHW does not use reset
Max Outdoor °F 50 100 70 N/A - DHW does not use reset
Min Outdoor °F –20 50 0 N/A - DHW does not use reset
Modulate On Diff °F 2 10 5 Boiler turns on if temperature drops below target minus
differential on
Modulate Off Diff °F 2 10 5 Boiler shuts down if modulates past target plus differential
off
Min On Time minutes off 240 30 Shortest time boiler will satisfy space heating system
before switching to DHW
Boost Interval minutes off 240 off When operating on ODR increases target 10°F when this
time expires until reaching MAX
Prepump Time: ###
SEC
seconds 0 240 20 Additional time to run circulators longer than standard 10
second time
Postpump Time: ###
SEC
seconds off 240 30 Circulator run time after call for heat ends
Maximum Rate
WM97+70
WM97+110
WM97+155
RPM
RPM
RPM
1100
1400
1300
4300
5650
5500
4150
5450
5300
Boiler Model and altitude specific
(derated automatically if HIGH ALTITUDE is selected in
control setup)
NOTE: Adjusting boiler firing rate will affect AFUE rating.
Minimum Rate
WM97+70
WM97+110
WM97+155
RPM
RPM
RPM
1100
1400
1300
4300
5650
5500
1100
1400
1300
Boiler Model and altitude specific
(derated automatically if HIGH ALTITUDE is selected in
control setup)
NOTE: Adjusting boiler firing rate will affect AFUE rating.
- 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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