Ductwork; Return Air; Filters; Gas Supply, Condensate Drain And Piping - Trane Oxbox 14 Seer Series Installation Instructions Manual

3.8 DUCTWORK

Ductwork should be made and sized by installer and in accordance
with Air Manual from Conditioning Contractors of America and local
codes.
On ductwork exposed to outside air conditioning space, use at
least 2" of insulation and a vapor barrier. Flexible joint may be
used to reduce noise.
These units are adaptable to horizontal use as well as rear supply and
return air duct openings. To convert to downflow, use the steps is
shown in 3.5.
A closed return duct system shall be used. This shall not preclude use
of economizers or ventilation air intake. Flexible joints may be used in
the supply and return duct work to minimize the transmission of noise.
CAUTION
When fastening duct work to the side duct flanges on the unit,
insert the screws through the duct flanges only. DO NOT insert
the screws through the casing. Outdoor duct work must be
insulation and waterproofed.
Be sure to note supply and return openings. Refer to Fig. 3 and
4 for information concerning rear and bottom supply and return
air duct openings.

3.9 RETURN AIR

WARNING
Never allow products of combustion to the flue products to
enter the return air ductwork, or the circulating air supply.
All return ductwork must be adequately sealed and
secured to the furnace with sheet metal screws, and joints
taped. All other duct joints must be secured with approved
connections and sealed airtight.
Failure to prevent products of combustion from being
circulated into the living space can create potentially
hazardous conditions,
poisoning that could result in personal injury or death.

3.10 FILTERS

The installer must install field supplied filters in the return air duct. A
field installed filter grille is recommended for easy and convenient
access to the filters for periodic inspection and cleaning. Filters must
have adequate face area for the rated air quantity of the unit. See air
delivery tables for recommended filter size.
4.0 GAS SUPPLY, CONDENSATE DRAIN AND
PIPING

4.1 GAS CONNECTION

IMPORTANT: Connect this unit only to gas supplied by a commercial
utility.
1. Install gas piping in accordance with local codes and regulations of
the local utility company. In the absence of local codes, the
installation must conform to the specifications of the National Fuel
Gas Code, ANSI Z223.1 - latest edition.
NOTE: The use of flexible gas connectors is not permitted. If local
codes allow the use of a corrugated stainless steel flexible gas
appliance connector, always use a new listed connector. Do not
use a connector which has previously serviced another gas
appliance.
installation & owner's manual
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NOTE
NOTE
including carbon monoxide
NOTE: The Commonwealth of Massachusetts requires the gas
shut-off valve to be a T-handle gas cock.
2. Connect the gas line to the gas pipe inlet opening provided into the
1/2" inlet valve. See Fig. 4-1 for typical piping.
3. Size the gas line to the furnace adequate enough to prevent undue
pressure drop and never less than 1/2" nominal pipe size.
4. Install a drip leg or sediment trap in the gas supply line as close to
the unit as possible.
5. Install an outside ground joint union to connect the gas supply to
the control assembly at the burner tray, Unions may not be
installed inside the unit.
6. Gas valves have been factory installed. Install a manual gas valve
where local codes specify a shut-off valve outside the unit casting.
7. Make sure piping is tight. A pipe compound resistant to the action of
liquefied petroleum gases must be used at all threaded pipe
connections.
8. IMPORTANT: Any additions, changes or conversions required for
the furnace to satisfactorily meet the application should be made
by a qualified installer, service agency or the gas supplier, using
factory-specified or approved parts. In the commonwealth of
Massachusetts, installation must be performed by a licensed
plumber or gas fitter for appropriate fuel.
IMPORTANT: Disconnect the furnace and its individual shutoff valve
the gas supply piping during any pressure testing of that system at
test pressures in excess of 1/2 psig or isolate the system from the gas
supply piping system by closing its individual manual shutoff valve
during any pressures equal to or less than 1/2 psig.
Gas line
Manual gas shut-off valve
(Installed Ahead of Ground
Joint Pipe Union)
Drip leg or Trap
Fig. 4-1 Typical Gas Pipe Arrangement
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result in
serious injury, death of property damage.
Never test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection of
leaks to check all connections. A fire or explosion may result
causing property damage, personal injury or loss of life.
TO CHECK FOR GAS LEAKS, USE A SOAP AND WATER
SOLUTION OR OTHER APPROVED METHOD. DO NOT USE AN
OPEN FLAME.
IMPORTANT: Check the rating plate to make certain the appliance is
equipped to burn the type of gas supplied. Care should be taken after
installation of this equipment that the gas control valve not be
subjected to high gas supply the pressure.
In making gas connections, avoid strains as they may cause noise
and damage the controls. A backup wrench is required to be used on
the valve to avoid damage.
The capacity of gas pipe of different diameters and lengths in CFH
with pressure drop of 0.5 in. and specific gravity of 0.60 (natural gas)
are shown in Table 4-1.
Ground Joint Pipe Union
To Be Installed Ahead of
Gas Valve
Gas line to unit