| MANUAL | |
| (UPSTREAM FROM GROUND | |
| JOINT PIPE UNION) | |
GROUND | ALTERNATE | |
UNION | ||
JOINT | ||
LOCATION | ||
PIPE | ||
DRIP LEG | ||
UNION | ||
| ||
GAS VALVE | GROMMET IN STANDARD | |
GAS LINE HOLE | ||
|
BURNERS |
DRAIN TRAP |
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| GROMMET IN ALTERNATE |
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MANIFOLD |
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| GAS LINE HOLE | ||
ALTERNATE GAS |
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LINE LOCATION |
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HORIZONTAL [UPFLOW MODEL]
| ALTERNATE |
GROUND | UNION |
LOCATION | |
JOINT |
|
PIPE |
|
UNION |
|
GAS VALVE |
|
BURNERS |
DRAIN TRAP |
MANIFOLD | GORMMET IN ALTERNATE |
ALTERNATE GAS | GAS LINE HOLE |
LINE LOCATION |
|
HORIZONTAL [COUNTERFLOW]
Gas Piping Connections
WARNING
EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A PRECAUTION WHEN REMOVING HOLE PLUGS.
DIRECT/STANDARD INLET PIPING
When gas piping enters directly to the gas valve through the standard 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 cabi- net penetration. A
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) Close nipple
•(1) 90 degree street elbow
•(1) 2 1/2” pipe nipple
•(1) 90 degree elbow
•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 the cabinet. A
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.
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).
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