Manual

26
DIRECT/STANDARD INLET PIPING
When gas piping enters directly to the gas valve through the stan-
dard inlet hole, the installer must supply straight pipe with a ground
joint union to reach the exterior of the furnace. The rigid pipe must
be long enough to reach the outside of the cabinet to seal the
grommet cabinet penetration. A semi-rigid connector to the gas
piping can be used outside the cabinet per local codes.
INDIRECT/ALTERNATE INLET PIPING
When gas piping enters indirectly to the gas valve through the
alternate gas inlet hole the following 1/2 inch pipe fittings (starting
from the gas valve) to reach the outside of the cabinet must be
supplied:
• 1 - 90 degree street elbow.
• 1 - 2-1/2 inch pipe nipple.
• 1 - 90 degree elbow.
• 1 - Straight pipe
The straight pipe must be long enough to reach the outside
of the cabinet so as to seal the grommet cabinet penetration
and to install the ground joint union outside of the cabinet. A
semi-rigid connector to the gas piping can be used outside
the cabinet per local codes.
GAS PIPING CHECKS
Before placing unit in operation, leak test the unit and gas connec-
tions.
T O AVOID THE POSSIBILITY OF EXPLOSION OR FIRE , NEVER USE A
MATCH OR OPEN FLAME TO TEST FOR LEAKS .
WARNING
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).
PROPANE GAS TANKS AND PIPING
I F THE GAS FURNACE IS INSTALLED IN A BASEMENT , AN EXCAVATED
AREA OR A CONFINED SPACE , IT IS STRONGLY RECOMMENDED TO
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 , ANY LEAKING AS CAN
SETTLE IN ANY LOW AREAS OR CONFINED SPACES .
• P
ROPANE GAS ODORANT MAY FADE , MAKING THE GAS
U NDETECTABLE EXCEPT FOR WITH A WARNING DEVICE .
WARNING
• Connect the furnace to the building piping by one of the
following methods:
– Rigid metallic pipe and fittings.
– Semi-rigid metallic tubing and metallic fittings.
Aluminum alloy tubing must not be used in exterior
locations. In order to seal the grommet cabinet
penetration, rigid pipe must be used to reach the
outside of the cabinet. A semi-rigid connector to the
gas piping may be used from there.
• Use listed gas appliance connectors in accordance with
their instructions. Connectors must be fully in the same
room as the furnace.
• Protect connectors and semirigid tubing against physical
and thermal damage when installed. Ensure aluminum-
alloy tubing and connectors are coated to protect against
external corrosion when in contact with masonry, plaster, or
insulation, or subjected to repeated wetting by liquids such
as water (except rain water), detergents, or sewage.
ALTERNATE
GAS LINE
LOCATION
PLUG IN
ALTERNATE
GAS LINE
HOLE
PIPE UNION
MANIFOLD
BURNERS
GAS VALVE
HORIZONTAL [UPFLOW MODEL]
MANUAL SHUT-OFF VA LVE
(UPSTREAM FROM GROUND
JOINT PIPE UNION)
DRIP LEG
GROMMET IN STANDARD
GAS LINE HOLE
DRAIN TRAP
ALTERNATE GAS
LINE LOCATION
MANIFOLD
PLUG IN ALTERNATE
GAS LINE HOLE
GAS VALVE
GROUND JOINT
PIPE UNION
BURNERS
NOTES
:
1. WHEN GAS LINE IS IN THE ALTERNATE
LOCATION
,
SWAP THE POSITION OF
THE PLUG AND GROMMET
.
MANUAL
SHUT OFF VALVE
(UPSTREAM FROM
GROUND JOINT
PIPE UN ION)
GROMMET
IN STANDARD
GAS LINE HOLE
HEIGHT REQUIRED
BY LOCAL CODE
DRIP LEG
UPFLOW
2. DRIP LEG MAY TERMINATE WITH
A 1/2" X 1/8" PIPE PLUG TO
ACCOMMODATE LINE GAS
PRESSURE MEASUREMENT.
GROUND JOINT
PIPE UNION
Gas Piping Connections
E DGES OF SHEET METAL HOLES MAY BE SHARP . U SE GLOVES AS A
PRECAUTION WHEN REMOVING HOLE PLUGS .
WARNING