4BN/L6-24,4SN/L5 -24 Manual
IM100310
RD: MAR, 2010
RL: 1A - BA
8
5.
GAS CONVERSION:
NATURAL GAS or LP GAS
WARNING:
Conversion from one fuel gas to another shall only be done by a trained
and qualified gas service technician. Ensure all gas supply and heater components
are correct for the type of fuel gas in use.
Use only parts and components supplied by the manufacturer to accomplish conversion from one
gas type to another. Incorrect or improper conversion can result in personal injury, death, fire,
and/or property damage, and will void the product warranty.
Conversion from natural gas to LP gas
: Requires LP gas orifice (order JP-4009-OL-J from
manufacturer), conversion of gas control valve to LP gas (see below), and an LP pressure regula-
tor (field supplied) in the gas supply line
Conversion from LP gas to natural gas
: Requires natural gas orifice (order JP-4009-ON-J from
manufacturer), conversion of gas control valve to natural gas (see below), and a natural gas pres-
sure regulator (field supplied) in the gas supply line
1. Install the proper gas type orifice (see heater exploded view page 29)
2. Convert Gas valve:
Conversion from NAT to LP (or
vice-versa) is accomplished by in-
verting the position of the conver-
sion screw in the gas valve body,
and replacing the orifice
The conversion screw is marked
with “
NAT
” on one end and “
LP
’’
on the other end - the arrow “ ’’
indicates the end to be inserted
into the valve
Ensure that the gas selection nip-
ple is seated firmly into the valve
body for the correct gas type
2. Check gas pressures:
Ensure the gas supply pressure
regulator matches the gas type
Check and set the gas supply
pressure to ensure a minimum 5”
w.c. natural gas (7” w.c. maximum) or minimum 11” w.c. LP gas (14” w.c. maximum)
The heater manifold pressure can be checked at either of the side ports on the gas control
valve
Remove one of the threaded plugs at the side of the valve
Install a hose barb, connect and read manifold pressure with manometer
The valve is factory-adjusted to 3.5” w.c. natural gas and 10.5” w.c. LP gas
Replace threaded plug after confirming manifold gas pressure - use sealant on
threads
Conversion screw
Manifold gas
pressure
test port
3/8” FNPT gas supply
Gas type marked in
conversion screw
