Installation
GUNE-SVX001A-EN
13
Gas Pipe Sizing
Pipe Sizing
To provide adequate gas pressure to the gas unit heater,
size the gas piping as follows:
1.
Find the ft
3
/h by using the following formula:
2. Refer to
. Match “Length of Pipe in Feet”
with appropriate “Gas Input - ft
3
/h” value. This value
can then be matched to the pipe size at the top of the
column.
Example:
It is determined that a 67-foot (20.4-m) run of gas pipe
is required to connect a 200 MBtu gas unit heater to a
1,000 Btu/ft
3
(0.29 kW) natural gas supply.
, a 1-inch pipe is needed.
Note:
Refer to
“General Safety Information,” p. 3
for
English/Metric unit conversion factors.
Important:
•
If more than one unit heater is to be served by the same
piping arrangement, the total ft
3
/h input and length of
pipe must be considered.
•
If the gas unit heater is to be fired with LP gas, consult
your local LP gas dealer for pipe size information.
•
Heater installation for use with propane (bottled) gas
must be made by a qualified LP gas dealer or installer.
He/She will ensure that proper joint compounds are
used for making pipe connections, that air is purged
from lines, that a thorough test is made for leaks before
operating the heater, and that it is properly connected
to the propane gas supply system.
Before any connection is made to the existing line
supplying other gas appliances, contact the local gas
company to make sure that the existing line is of adequate
size to handle the combined load.
WARNING
Fire Hazard!
Do not connect gas piping to this unit until a supply
line pressure/leak test has been completed. Connecting
the unit before completing the pressure/leak test may
damage the unit gas valve and result in a fire hazard,
which could result in death, serious injury, and property
damage.
NOTICE:
Equipment Damage!
Do not rely on a shut-off valve to isolate the unit while
conducting gas pressure/leak tests. These valves may
not be completely shut off, exposing the gas valve to
excessive pressure and damage.
ft
3
/h
=
Input BTU/h/1000
1,000
200,000 BTU/h
=
200 ft
3
/h
1,000 BTU/ft
3
