Weil-McLain WM97+70 Specifications download pdf (Page 63)

Part number 550-142-120/0113

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WM97+ gas-fired water boiler — Boiler Manual

Gas piping

WM97+ boilers are shipped ready to ﬁre natural

gas ONLY. You must install the propane oriﬁce

bushing if the boiler will be connected to propane.

See page 14. Failure to comply could result in severe

personal injury, death or substantial property dam-

age.

Connecting gas supply piping

1. Remove jacket front panel and refer to Figure 73 to pipe gas to

boiler.

a. Place a pipe wrench on the gas line inside the jacket when

tightening the gas line assembly to the boiler gas connection

(item 1).

b. Install steel pipe ﬁttings and factory-supplied gas cock as shown

in Figure 73. All pipe ﬁttings are supplied by the installer. The

gas cock is shipped loose with the boiler.

c. In Canada — The gas shut-off valve (item 2) must be identi-

ﬁed by the installer.

2. Use pipe dope compatible with propane gases. Apply sparingly

only to male threads of pipe joints so that pipe dope does not

block gas ﬂow.

Failure to apply pipe dope as detailed above can result

in severe personal injury, death or substantial property

damage.

3. Connect gas supply piping to the ½” NPT gas cock (item 2).

4. Support gas piping with hangers, not by boiler or its accessories.

5. Purge all air from gas supply piping.

6. Before placing boiler in operation, check boiler and its gas con-

nection for leaks.

a. During any pressure testing at less than 13” (330 mm) w.c.,

close the gas shutoff valve and disconnect system gas piping.

At higher test pressures, disconnect boiler and gas valve from

gas supply piping.

Do not check for gas leaks with an open ﬂame — use

bubble test. Failure to use bubble test or check for gas

leaks can cause severe personal injury, death or substan-

tial property damage.

DO NOT adjust or attempt to measure gas valve outlet

pressure. The gas valve is factory-set for the correct out-

let pressure. This setting is suitable for natural gas and

propane. Attempting to alter or measure the gas valve

outlet pressure could result in damage to the valve, caus-

ing potential severe personal injury, death or substantial

property damage.

Gas pipe sizing

1. See page 18 for gas line sizing information.

Check gas pressure at inlet to boiler

1. See Figure 100, page 92 (WM97+70/110) or Figure 102, page 93

(WM97+155) for location of the gas inlet pressure test port.

Use two wrenches when tightening gas

piping at boiler, using one wrench to pre-

vent the boiler gas line connection from

turning. Failure to support the boiler gas

connection pipe to prevent it from turn-

ing could damage gas line components.

Figure 73

Connect gas supply piping

(WM97+70/110 shown)

1 Boiler gas supply connection,

½” NPT male

2 T-handle gas cock, ½” NPT,

shipped loose with boiler

ALL OF THE FOLLOWING ARE

SUPPLIED BY THE INSTALLER:

3 Nipple, ½” NPT

4 Union, ½” NPT

5 Nipple, ½” NPT

6 Tee, ½” NPT

7 Nipple, ½” NPT x 4”, for drip leg

8 Cap, ½” NPT

For installations using

a Companion Water

Heater (CWH), the

gas piping must be

routed to pass through

the right or left side

opening in the CWH

piping cover panel.

See CWH manual for

details.

2. For natural gas or propane, the pressure required at gas

valve inlet pressure port (verify minimum gas pressure

when all gas appliances are in operation):

a. Maximum: 13” (330 mm) w.c. with no ﬂow (lockup)

or with boiler on.

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.

3. Install 100% lockup gas pressure regulator in supply

line if inlet pressure can exceed 13” (330 mm) w.c. at

any time. Adjust lockup regulator for 13” (330 mm)

w.c. maximum.

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Weil-McLain WM97+70 Specifications Page 63

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