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Connect gas supply piping
Part number 550-100-260/0520
57
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
1 Boiler gas supply connection, ½" NPT male
2 Manual gas shut off valve, ½" NPT
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
when tightening gas
piping at boiler, using one wrench to prevent
the boiler gas line connection from turning.
Failure to support the boiler gas connection
pipe to prevent it from turning could damage
gas line components.
Boilers are shipped ready to operate on natural
gas ONLY. You must install the propane mixer
(venturi) and orifice if the boiler will be
connected to propane. See page 14. Failure to
comply could result in severe personal injury,
death or substantial property damage.
Connecting gas supply piping
1. Remove jacket door and refer to Figure 68 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 manual gas
shut off valve as shown in Figure 68. All pipe fittings and
gas shut-off valve are supplied by the installer.
c. In Canada — The manual gas shut off valve (Item 2) must
be identified 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 manual gas shut
off valve (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
connection for leaks.
a. During any pressure testing at less than 14" (355 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
substantial property damage.
DO NOT adjust or attempt to measure gas valve
outlet pressure. The gas valve is factory-set for the
correct outlet 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, causing potential severe
personal injury, death or substantial property
damage.
See page 19 for gas line sizing information.
1. See Figure 93, page 102 for location of the gas inlet pressure
test port.
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: 14" (355 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) : 3½" (89 mm)
w.c.
c. Nominal propane gas pressure: 11.0" (279 mm) w.c.
d. Nominal natural gas pressure: 7.0" (178 mm) w.c.
3. Install 100% lockup gas pressure regulator in supply line
if inlet pressure can exceed 14" (355 mm) w.c. at any time.
Adjust lockup regulator for 14" (355 mm) w.c. maximum.
Gas piping
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