Install Instructions
Gas piping
ECO boilers are shipped ready to fire natural gas
ONLY. You must install the propane orifice bush-
ing if the boiler will be connected to propane. See
page 13. Failure to comply could result in severe
personal injury, death or substantial property dam-
age.
Connecting gas supply piping
1. Remove jacket door and refer to Figure 61 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 61. 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.
'ASPIPESIZING
1. See page 17 for gas line sizing information.
#HECKGASPRESSUREATINLETTOBOILER
1. See Figure 86, page 80 (ECO 70/110) or Figure 87, page 81 (ECO
155) for location of the gas inlet pressure test port.
5SETWOWRENCHES 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.
&IGURE
Connect gas supply piping
1 Boiler gas supply connection, ½” NPT male
2 T-handle gas cock, ½” NPT, shipped loose with boiler
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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
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 dur-
ing boiler startup, while boiler is at high fire) — ECO
70: 3½” (89 mm) w.c.; ECO 110: 4½” (114 mm) w.c.;
ECO 155: 3½” (89 mm) w.c.
c. Nominal gas pressure: 11.0” (279 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.
Part number 550-142-122/0513
55
TM
GAS-FIRED WATER BOILER — Boiler Manual