Weil-McLain WM97+70 Specifications Page 18
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Part number 550-142-120/0113
WM97+ gas-fired water boiler — Boiler Manual
– 18 –
Gas piping — sizing gas lines
Figure 14 Pipe capacity for 0.60 specific gravity
natural gas; pipe length is in equivalent
feet
Gas
pipe
total
length,
feet
Capacity
Cubic feet per hour, natural gas, 0.60 specific gravity
Gas pressure 13” (330 mm) w.c. or less
Pressure drop 0.3 inches (7.6 mm) w.c.
½” ¾” 1” 1¼” 1½” 2” 2½”
10
132 278 520 1050 1600 3050 4800
20
92 190 350 730 1100 2100 3300
30
73 152 285 590 890 1650 2700
40
NA 130 245 500 760 1450 2300
50
NA 115 215 440 670 1270 2000
75
NA 105 175 360 545 1020 1650
100
NA 96 150 305 460 870 1400
150
NA 90 120 250 380 710 1130
Figure 15 Equivalent lengths of straight pipe for
typical gas line fittings
Pipe size
inches
Equivalent length, feet
90° Elbow Tee
short
radius
long
radius
line
flow
branch
flow
½
3.6 2.2 1.7 4.2
¾
4.4 2.3 2.4 5.3
1
5.2 2.7 3.2 6.6
1¼
6.6 3.2 4.6 8.7
1½
7.4 3.4 5.6 9.9
2
8.5 3.6 7.7 12.0
2½
9.3 4.0 9.3 13.0
Boiler gas connection is ½” NPT. Size gas lines large
enough to provide gas to all connected appliances.
Natural Gas:
Pipe sizing for natural gas
1. Size gas piping from meter outlet to entrance of boiler in accor-
dance with Figure 14 and Figure 15.
2. Use total input of all connected appliances. Divide total input in
Btuh by 1,000 to obtain cubic feet per hour of natural gas.
a. Pipe lengths in Figure 14 are equivalent length of straight
pipe. Convert pipe fittings to equivalent lengths using data
from Figure 15.
b. Figure 14 is only for natural gas with specific gravity 0.60, with
a pressure drop through the gas piping as listed in the table.
c. For additional gas pipe sizing information, refer to ANSI Z223.1
(or B149.1 or B149.2 for Canadian installations).
Natural gas supply pressure
1. Pressure required at gas valve inlet pressure port:
a. Maximum: 13” (330 mm) w.c. with no flow (lockup).
b. Minimum gas pressure, with gas flowing (verify during
boiler startup, while boiler is at high fire):
WM97+70: 3½” (89 mm) w.c.
WM97+110: 4½” (114 mm) w.c.
WM97+155: 3½” (89 mm) w.c.
2. Install 100% lockup gas pressure regulator in supply line if inlet
pressure can exceed 13” w.c. at any time. Adjust lockup regulator
for 13” w.c. maximum.
Propane Gas:
You must follow the instructions, beginning on page 14,
to operate the boiler on propane. Failure to comply could
result in severe personal injury, death or substantial
property damage.
Pipe sizing for propane gas
1. Contact gas supplier to size pipes, tanks and 100% lockup gas
pressure regulator.
Propane supply pressure
1. Adjust propane supply regulator provided by gas supplier for 13”
(330 mm) w.c. maximum pressure.
2. Pressure required at gas valve inlet pressure port:
a. Maximum: 13” (330 mm) w.c. with no flow (lockup).
b. Minimum gas pressure, with gas flowing (verify during
boiler startup, while boiler is at high fire):
WM97+70: 3½” (89 mm) w.c.
WM97+110: 4½” (114 mm) w.c.
WM97+155: 3½” (89 mm) w.c.
- 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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