Amana MEC80 Series Installation Instructions Manual page 23

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 fi ttings required will vary by the side chosen, location
of union and cabinet width. The union may be placed inside
or outside of the cabinet.
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
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 specifi ed pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overfi ring, 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
pressures 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).
Burners Manual Shut Off Valve
(upstream from
ground joint
pipe union)
*Ground
Joint
Pipe
Union
Drip Leg
Grommet
in Standard
Gas Line
Hole
UPFLOW
Figure 20
WARNING
,
NEVER USE A MATCH
.
P G T
ROPANE AS ANKS AND
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
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 Considerations 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 appli ances in
operation. Maintaining proper gas pressure depends on three
main factors:
1. Vaporization rate, depending on temperature of the
liquid, and "wetted surface" area of the con tainer or
containers.
2. Proper pressure regulation. (Two-stage regulation is
recommended for both cost and effi ciency).
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 vaporiza tion, rec-
ommended regulator settings, and pipe sizing is available from
most regulator manufacturers and propane gas suppliers.
Since propane gas will quickly dissolve white lead and most stan-
dard 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 piping.
First Stage
Regulator
200 PSIG
Maximum
Propane Gas Installation (Typ.)
23
P
IPING
WARNING
,
AN EXCAVATED
,
IT IS STRONGLY RECOMMENDED TO
.
,
ANY LEAKING GAS CAN
.
,
MAKING THE GAS UNDETECTABLE
.
5 to 15 PSIG
(20 PSIG Max.)
Continuous
11" W.C.
Second Stage
Regulator
Figure 21