FloAire FAV-M User Manual
Page 11
11
Gas Connection Sizes
BTU Input
Gas Pressure (Inches W.C. & PSI)
7” – 14”
15” – 1#
1# - 5#
158,000
½
½
½
275,000
¾
½
½
549,999
¾
¾
¾
1,099,999
1
¾
¾
1,374,999
1 ¼
¾
¾
1,649,999
1 ½
1
1
1,924,999
2
1
1
2,474,999
2
1 ¼
1
2,749,999
2
1 ½
1
3,574,999
2
2
1 ¼
4,124,999
2
2
1 ½
5,224,999
2 ½
2
2
5,774,999
2 ½
2
2
7,974,999
2
2
8,524,999
2 ½
2
9,624,999
2 ½
2
11,274,999
2 ½
2
11,824,999
3
2
12,924,999
3
2 ½
16,847,999
3
BTU Input
158,000
275,000
Gas
Gas piping must be installed to conform with local building codes, or in the absence of local codes, the
National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition. In Canada, gas piping must be
installed in accordance with CAN/CGA-B149.1 for natural gas units and CAN/CGA-B149.2 for propane
units.
WARNING
Inlet gas pressure must not exceed pressure
indicated on name plate.
Refer to the heater rating plate for
determining the minimum gas supply
pressure for obtaining the maximum gas
capacity for which this heater is specified.
1. Always disconnect power before working
on or near a heater. Lock and tag the
disconnect switch or breaker to prevent
accidental power-up.
2. Piping to the unit should conform to local
and national requirements for type and
volume of gas handled, and pressure drop
allowed in the line. Refer to the Gas
Engineer’s Handbook for gas line capacities.
3. The incoming pipe near the heater should
be sized to match the connection on the
outside of the unit. Unit inlet sizes are shown
in the table to the right. Avoid multiple taps
in the gas supply so the unit has a steady
supply of gas at all times.
4. Install a ground joint union with brass seat
and a manual shut-off valve external to the
unit casing, as shown below, adjacent to the
unit for emergency shut-off and easy
servicing of controls.
5. Provide a sediment trap, as shown below,
before each unit and where low spots in the
pipe line cannot be avoided.
6. Blow out the gas line to remove debris
before making connections. Before starting
the unit, purge line to remove air. Purge air
from gas lines according to ANSI Z223.1-
latest edition “National Fuel Gas Code,” or in
Canada: CAN/CGA-B149.
7. All field gas piping must be pressure/leak
tested prior to operating the unit. Use a
soap solution or equivalent for leak testing.
The heater and its individual shut-off valve
must be disconnected from the gas supply
piping system during any pressure testing of
that system at test pressures in excess of ½
PSI. During any pressure testing of the gas
supply piping system at test pressures equal
to or less than ½ PSI, the heater must be
isolated from the gas supply piping system
and its individual manual shutoff valve
closed.
8. This unit requires the gas pressure to be
within the unit’s minimum and maximum gas
pressure ratings. If the pressure is greater
than the maximum, the internal valve
components will be damaged. If the
pressure is below the minimum, the heater
will not perform to specifications.
9. If installing on a paint booth application, a
manual shutoff should be located for access
in case of a fire or explosion at the heater.