Louisville Tin and Stove 90N50A - Manual (Page 9)

Refer to Figure 11 for the basic fittings you will need
at the furnace.
1. Use black iron or steel pipe and fittings or other
pipe and fittings that are approved by local codes.
2. Use pipe joint compound that is resistant to the
action of Liquefied Petroleum (L.P.) Gas or to any
other chemical constituents of the gases to be
conducted through the piping only on male
threads.
3. Use two wrenches when making the connection
to the valve to keep from bending the mounting
bracket or manifold pipe. Do not overtighten as
damage to the valve can occur.
4. Provide a 1/8” nominal pipe thread (NPT) plugged
tapping for test gauge connection immediately
upstream of the gas supply connection to the
floor furnace.
5. Provide a sediment trap at least 6 inches long to
trap dirt and moisture. Provide space to permit
cleaning or emptying.
6. Use a ground joint union.
7. Install an approved manual shut-off valve.
CONNECTING THE GAS PIPING
ADDITIONAL L.P. GAS REQUIREMENTS
8. Have all connections made at the storage tank by a licensed L.P. Gas installer.
9. Have L.P. Installer check all lines, piping, and connections from the storage tank to the floor furnace when the floor
furnace is connected to the storage tank.
10. The regulator on the storage tank should be set at 11 inches water column.
CHECKING THE GAS PIPING
All joints must be tested for leaks by applying pressure to the piping system. If the test pressure is equal to or less than ½
PSIG the floor furnace must be isolated from the gas supply piping system by closing the manual gas shut-off valve on the
floor furnace. If the test pressure exceeds ½ PSIG, the floor furnace and its manual gas shut-off valve must be disconnected
from the gas piping system before testing. Failure to do so may result in damage to the pressure regulator
in the gas valve resulting in overfiring. Overfiring can result in combustion chamber failure, property
damage, bodily injury or death.
Use a mixture of soap and water or liquid detergent to check each joint. Leaks will be indicated by bubbles forming. Correct
even the smallest leak at once. Since some soaps may cause corrosion, or stress cracking, rinse the gas piping exterior with
water after testing to remove the soap.
WARNING
Never use a match, candle, open flame or other method which could provide a source of ignition to
test for leaks. To do so may result in property damage, bodily injury or death.
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
Page 9
FIGURE 11
To heater gas control valve
Manual cut-off valve
Gas
Supply
Line
1/8” NPT
Pressure Tap
Drip
Leg