Utica Boilers JE 安装指导
28
Gas Supply Connection, Natural Gas Only
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
2.
On multiple base boilers, connect gas service with
branch lines from common main.
3.
Install ground joint union in each branch line for easy
servicing of gas controls.
4.
Provide sediment trap up stream of gas valve. Figure 36.
5.
Size and install gas piping system to provide sufficient
gas supply to meet maximum input at not less than
minimum supply pressure. See Chart 6 for pipe sizes
for gas mains.
6.
Pressure test boiler and gas connection before
placing boiler in operation.
• Pressure test over 1/2 psig (3.5 kPa). Disconnect
boiler and its individual gas shutoff valve from
gas supply system.
• Pressure test at 1/2 psig (3.5 kPa) or less.
Isolate boiler from gas supply system by closing
manual gas shutoff valve.
• Locate leakage using gas detector, noncorrosive
detection fluid, or other leak detection method
acceptable to authority having jurisdiction. Do
not use matches, candles, open flames, or other
methods that can provide ignition source.
• Correct leaks immediately and retest.
Chart 5
Minimum Operating Gas Supply Pressure
Models
5.0 inches w.c.
300
500
600
1000 1300 1500
Models
5.3 inches w.c.
400
700
800
900
1100 1200 1400
All
Models
Maximum Gas Supply Pressure
13.5 inches w.c.
All
Models
Manifold Pressure
3.5 inches w.c.
Chart 6
TABLE OF PIPE SIZES IN INCHES FOR GAS MAINS
(NATURAL GAS)
Boiler
No
20’ 30’ 40’ 50’ 60’ 80’ 100’ 125’ 150’
300
1¼ 1¼ 1¼ 1¼ 1¼ 1¼
1½
1½
1½
400
1¼ 1¼ 1¼ 1¼ 1½ 1½
1½
1½
2
500
1¼ 1¼ 1¼ 1½ 1½ 1½
2
2
2
600
1¼ 1½ 1½ 1½
2
2
2
2
2
700
1¼ 1½ 1½
2
2
2
2
2
2½
800
1½ 1½
2
2
2
2
2
2½
2½
900
1½
2
2
2
2
2
2½
2½
2½
1000
1½
2
2
2
2
2½
2½
2½
2½
1100
2
2
2
2
2
2½
2½
2½
2½
1200
2
2
2
2
2½ 2½
2½
2½
3
1300
2
2
2
2½ 2½ 2½
2½
3
3
1400
2
2
2
2½ 2½ 2½
3
3
3
1500
2
2
2½ 2½ 2½ 2½
3
3
3
CONNECTING GAS SERVICE
Figure 36
CAUTION
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
• 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 fire
department.
!
DANGER
Fire Hazard. Do not use matches, candles, open
flames, or other methods providing ignition source.
Failure to comply will result in death or serious
injury.
!