shipped from the factory. Maximum torque for the gas valve connection is 375
•Install a manual shutoff valve between the gas meter and unit within six feet of the unit. If a union is installed, the union must be downstream of the manual shutoff valve, between the shutoff valve and the furnace.
•Tighten all joints securely.
•Connect the furnace to the building piping by one of the following methods:
–Rigid metallic pipe and fittings.
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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
•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.
CAUTION
EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES A PRECAUTION WHEN REMOVING HOLE PLUGS.
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
INDIRECT/ALTERNATE INLET PIPING
When gas piping enters indirectly to the gas valve through the alternate gas inlet hole the following fittings (starting from the gas valve) to reach the outside of the cabinet must be supplied:
•Coupling.
•90 degree elbow.
•2 inch close nipple.
•90 degree elbow.
•Straight pipe, with a ground joint union, to reach the exterior
GAS VALVE
MANIFOLD | BURNERS |
ALTERNATE
GAS LINE
LOCATION
PLUG IN
ALTERNATE
GAS LINE
HOLE
GROUND JOINT
PIPE UNION
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| SHUT OFF VALVE |
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GROUND JOINT | GAS LINE | ||
SHUT OFF VALVE | PIPE UNION) | LOCATION | |
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HEIGHT REQUIRED | BY LOCAL CODE | ||
GAS LINE | |||
BY LOCAL CODE |
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DRIP LEG | B URNERS |
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GAS PIPING CHECKS
Before placing unit in operation, leak test the unit and gas connec- tions.
WARNING
TO AVOID THE POSSIBILITY OF EXPLOSION OR FIRE, NEVER USE A MATCH OR OPEN FLAME TO TEST FOR LEAKS.
| UPFLOW |
| COUNTERFLOW |
| MANUAL |
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GROUND JOINT |
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GAS VALVE | GROMMET IN STANDARD | GAS VALVE | GROMMET IN STANDARD |
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Gas Piping Connections
Check for leaks using an approved
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
WARNING
PROPANE GAS IS HEAVIER THAN AIR AND ANY LEAKING GAS CAN SETTLE IN ANY LOW AREAS OR CONFINED SPACES. TO PREVENT PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH DUE TO FIRE OR EXPLOSION CAUSED BY A PROPANE GAS LEAK, INSTALL A GAS DETECTION 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
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