Lennox GWB9-050IH-3, Руководство по установке, Страница: 28 / 64

28
Check Gas Supply
Gas pipe to your boiler must be correct size for length of
run and for total Btu per hour input of all gas utilization
equipment connected to it. See Table 7, Page 29 .
Boiler and its individual shutoff valve must be disconnected
from gas supply piping system during any system pressure
testing at test pressures in excess of ½ psig (3.5kpa).
Boiler must be isolated from gas supply piping system
by closing its individual manual shutoff valve during
any pressure testing of gas supply piping system at test
pressures equal to or less than ½ psig (3.50ka).
Table 6 - Gas Supply Pressure
NATURAL
GAS
PROPANE
GAS
Maximum Gas Supply
Pressure
10” w.c. 14” w.c.
Minimum Gas Supply
Pressure
4” w.c. 10” w.c.
GAS SUPPLY PIPING
Connecting The Gas Piping
See Figure 19, Page 29 for general layout at boiler.
Gas line enters boiler from right side jacket panel.
Boiler is equipped with ½” NPT connection on gas valve for
supply piping.
Following rules apply:
1.
Use piping materials and joining methods acceptable
to authority having jurisdiction. In absence of such
requirements:
• USA - National Fuel Gas Code, ANSI Z223.1/NFPA 54
• Canada - Natural Gas and Propane Installation Code,
CAN/CSA B149.1
2.
Size and install gas piping system to provide suf fi cient
gas supply to meet maximum input at not less than
minimum supply pressure. See Table 7, Page 29
3.
Use ground joint unions.
4.
Provide sediment trap up stream of gas valve.
5.
Use two pipe wrenches when making the connection to
gas valve to keep it from turning.
6.
Install a manual shutoff valve in the vertical pipe about
5 feet above fl oor.
7.
Tighten all joints securely.
8.
Propane gas connections should only be made by
licensed propane installer.
9.
Two stage regulation should be used by propane
installer.
10.
Propane gas piping should be checked out by propane
installer.
CAUTION
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the fi re
department.
! !
DANGER
Fire Hazard. Do not use matches, candles, open
fl ames, or other methods providing ignition source.
Failure to comply will result in death or serious
injury.
!
Leak Check Gas Piping
Pressure test boiler and gas connection before placing
boiler in operation.
• Disconnect boiler and its individual gas shutoff
valve from gas supply system.
• Isolate boiler from gas supply system by closing
manual gas shutoff valve. See Figure 19,
Page 29 .
• Locate leakage using gas detector, noncorrosive
detection fl uid, or other leak detection method
acceptable to authority having jurisdiction. Do
not use matches, candles, open fl ames, or other
methods providing ignition source.
• Correct leaks immediately and retest.