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XI. Gas Piping
A. Guidelines and Requirements
All installation must conform to the National Fuel Gas
Code ANSI Z223.1/NFPA54, and/or local codes. In Can-
ada, installation must conform to the latest edition of
CSA B149.1 National Gas and Propane Gas Installation
Code, and/or local codes.
Safe operation of the appliance requires properly sized
gas supply piping. Design gas piping system to provide
adequate gas supply to the appliance. Account for
existing and expected future gas utilization equipments
such as boilers and cooking equipment.
1. First verify that the appliance is supplied with the
type of gas specified on the rating plate.
2. Account for pressure drop from the point of delivery
to the appliance. The maximum allowable system
pressure is ½ psig (14 in. wc). Refer to Table 28 for
model specific gas pressures and gas connection
sizes.
3. If the gas supply pressure is higher than 14 in. wc,
An additional field supplied pressure regulator will
be required.
4. For length of piping and number of fittings refer
to and Table 25 for maximum capacity of Schedule
40 pipe. Table 26 lists equivalent pipe length for
standard fittings.
5. Gas piping systems for gas specific gravity of 0.60
can be sized directly from Table 25 unless authority
having jurisdiction specifies a gravity factor be
applied. For other specific gravities, apply gravity
factor from Table 27. If exact specific gravity is not
shown choose next higher value.
6. The appliance and its gas connection must be leak
tested before placing it in operation.
7. To protect the gas valve when testing over 1/2 psig
(3.4 kPa), the appliance and its individual shutoff
valve must be disconnected from gas supply piping.
For testing at 1/2 psig (3.4 kPa) or less, isolate the
appliance from gas supply piping by closing the
manual shutoff valve on the appliance.
8. Locate leaks using approved combustible gas non-
corrosive leak detector solution.
9. The incoming gas pressure can be measured at the
pressure tapping on the manual ball valve.
10. If the high or low gas pressure switch tripped, it
must be manually reset before the appliance can
be restarted. (See Figure 20)
11. Gas piping shall be supported by fixed hangers or
stands and not by the appliance.
AMP 400-1000L I&O Manual
12. Purge all air from gas lines.
13. Install manual shutoff valve in accordance with
state and local requirements.
14. All threaded joints should be coated with piping
compound resistant to action of liquefied petroleum
gas.
B. Field Connecting Gas Supply
1. A manual shutoff valve is shipped loose with the
appliance and should be installed as shown in
Figure 19 with a sediment trap.
a. The manual shutoff valve includes tappings for
testing supply gas pressure to the appliance.
Pressure Tapping
Figure 19: The AMP 400-1000L Gas Connection
NOTICE
NOTICE
The high and low gas pressure switches incorporate
a vent limiter as per UL 353 and limits the escape
of gas to less than 1.0 CFH at 7 PSI if the internal
diaphragm ruptures.
Locate the field supplied gas pressure regulator a
minimum of 10 ft from the appliance with no more
than 1 elbow in-between.
Manual Shut-off Valve
(Factory supplied)
Must be installed wihtin 6 ft
(1.8 m) from the appliance
Sediment Trap
3 in. to 6 in. (75-150mm)
long pipe nipple
Union
45
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