Propane Gas Tanks And Piping - Goodman xMEC96 Series User Manual

cabinet per local codes. 1/2" NPT pipe and fittings are re-
quired. For models with an "L" shaped manifold, a 4 1/2"
long nipple is required. For models with a hook shaped mani-
fold, a 2" long nipple is required.
A semi-rigid connector to the gas piping can be used outside
the cabinet per local codes. From the elbow, the length of
pipe and the fittings required will vary by the side chosen,
location of union and cabinet width. The union may be placed
inside or outside of the cabinet.
G P C
AS IPING HECKS
Before placing unit in operation, leak test the unit and gas con-
nections.
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other approved
testing methods.
NOTE: Never exceed specified pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overfiring, resulting in heat exchanger failure.
Disconnect this unit and shutoff valve from the gas supply piping
system before pressure testing the supply piping system with pres-
sures in excess of 1/2 psig (3.48 kPa).
Isolate this unit from the gas supply piping system by closing its
external manual gas shutoff valve before pressure testing supply
piping system with test pressures equal to or less than 1/2 psig
(3.48 kPA).
P G T
ROPANE AS ANKS AND
A gas detecting warning system is the only reliable way to detect a propane gas leak. Rust can reduce the level of odorant in propane
gas. Do not rely on your sense of smell. Contact a local propane gas supplier about installing a gas detecting warning system. If the
presence of gas is suspected, follow the instructions listed in the
Safety Precautions section of this manual.
All propane gas equipment must conform to the safety standards of
the National Board of Fire Underwriters, NBFU Manual 58.
For satisfactory operation, propane gas pressure must be 10" WC
at the furnace manifold with all gas appliances in operation. Main-
taining proper gas pressure depends on three main factors:
1. Vaporization rate, depending on temperature of the liquid,
and "wetted surface" area of the container or containers.
2. Proper pressure regulation. (Two-stage regulation is
recommended for both cost and efficiency).
3. Pressure drop in lines between regulators, and between
second stage regulator and the appliance. Pipe size will depend
on length of pipe run and total load of all appliances.
Complete information regarding tank sizing for vaporization, recommended
regulator settings, and pipe sizing is available from most regulator manu-
facturers and propane gas suppliers.
Since propane gas will quickly dissolve white lead and most standard com-
mercial compounds, special pipe dope must be used. Always use a pipe
thread sealant approved for all gases.
Refer to the this illustration for typical propane gas installations and pip-
ing.
P
IPING
Alternate Manifold
Gas Line
Location
Gas Valve
*Ground
Joint
Pipe
Union
*NOTE: Union may be inside furnace cabinet where allowed by local codes.
Gas Connections
T
O AVOID THE POSSIBILITY OF EXPLOSION OR FIRE
OR OPEN FLAME TO TEST FOR LEAKS
I
F THE GAS FURNACE IS INSTALLED IN A BASEMENT
AREA OR CONFINED SPACE
CONTACT A PROPANE SUPPLIER TO INSTALL A GAS DETECTING WARNING
DEVICE IN CASE OF A GAS LEAK
S
•
INCE PROPANE GAS IS HEAVIER THAN AIR
SETTLE IN ANY LOW AREAS OR CONFINED SPACES
P
•
ROPANE GAS ODORANT MAY FADE
EXCEPT WITH A WARNING DEVICE
First Stage
Regulator
Propane Gas Installation (Typ.)
26
Burners Manual Shut Off Valve
(upstream from
ground joint
*Ground
Joint
Pipe
Union
Drip Leg
Grommet
in Standard
Gas Line
Hole
UPFLOW
Figure 28
WARNING
,
NEVER USE A MATCH
.
WARNING
,
AN EXCAVATED
,
IT IS STRONGLY RECOMMENDED TO
.
,
ANY LEAKING GAS CAN
.
,
MAKING THE GAS UNDETECTABLE
.
5 to 15 PSIG
(20 PSIG Max.)
200 PSIG
Second Stage
Maximum
Regulator
Figure 29
pipe union)
Continuous
11" W.C.