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Check Gas Supply
TABLE #5 - GAS SUPPLY PRESSURE
Pressure
Minimum
Maximum
Please check line pressure while unit is running.
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 Tables #6A & #6B for
proper size. Be sure your gas line complies with local codes
and gas company requirements.
TABLE #6A - NATURAL GAS PIPING SIZES
Pipe Capacity - BTU/Hr. Input
Pipe Length
½"
20'
92,000
40'
63,000
60'
50,000
TABLE #6B - PROPANE GAS PIPING SIZES
Pipe Capacity - BTU/Hr. Input
Pipe
Copper Tubing
Length
⅝"
20'
131,000
40'
90,000
60'
72,000
(1)
Includes Fittings
Length of pipe or tubing should be measured
from gas meter or propane second stage
regulator.
Connecting Gas Piping
Refer to Figure #12 for general layout at boiler. Gas line
enters boiler through left side panel.
Boiler is equipped with ½" NPT connection on gas valve for
supply piping and ½" NPT ball valve for manual shut off.
Following rules apply:
Use only those piping materials and joining methods
1.
listed as acceptable by the authority having jurisdiction,
or in the absence of such requirements,
•
United States - National Fuel Gas Code, ANSI
Z223.1/NFPA 54.
•
Canada - Natural Gas and Propane Installation Code,
CAN/CSA B149.1.
Use pipe joint compound suitable for liquefi ed
2.
petroleum gas on male threads only.
Natural Gas
Propane Gas
4" w.c.
10" w.c.
10" w.c.
14" w.c.
(1)
¾"
1"
190,000
350,000
130,000
245,000
105,000
195,000
(1)
(2)
Iron Pipe
¾"
½"
216,000
189,000
145,000
129,000
121,000
103,000
(2)
Outside Diameter
NOTICE
GAS SUPPLY PIPING
Use ground joint unions.
3.
Install sediment trap upstream of gas controls.
4.
Use two pipe wrenches when making connection to
5.
gas valve to keep it from turning.
Install manual main shutoff valve in vertical pipe
6.
about 5 feet (1.5m) above fl oor outside boiler
jacket.
Tighten all joints securely.
7.
Propane gas connections should only be made by
8.
licensed propane installer.
Two stage regulation should be used by propane
9.
installer.
Propane gas piping should be checked out by
10.
propane installer.
Recommend use ½" union suitable for natural and
11.
propane gas after ball valve to facilitate service on
1¼"
unit.
625,000
445,000
Figure 12 - Gas Piping
365,000
¾"
393,000
267,000
217,000
Leak Check Gas Piping
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 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.
15
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