Thermo Products PGL37-312, PGT16-160, PGT5-100, PGL20-180 I. Installation Of Natural Gas Piping

All installations and services must be performed by qualified service personnel.

Piping from the natural gas meter to the furnace shall be in accord with requirements of the local utility. Piping from the LP tank to the furnace must follow the recommendations of the gas supplier.

1.A readily accessible, certified manual shut off valve with a non-displaceable rotor member should be installed within six feet of the gas equipment it serves. A union or flanged connection shall be provided downstream from the manual valve to permit removal of controls. A 1/8" N.P.T. plugged tapping, that is accessible for connecting a test gage, must be installed immediately upstream of the gas connection to the furnace. Unions must be of a ground joint type or flanged-joint using a gasket resistant to LPG. Pipe dope or tape certified to be resistant to the action of liquified petroleum gases should be used on all threaded joints.

2.A drip leg must be used on both LP and natural gas installations prior to the furnace to trap oil, condensate and other impurities which might otherwise lodge in the gas valve or plug the burner orifice. When there is excessive condensation between the gas meter and the furnace, a drip leg shall be provided at the outlet of the gas meter. Failure to install a drip leg may void the limited warranty on the furnace.

NOTE: All gas piping must be leak tested using a soap and water solution (if the gas is turned on) following the procedure outline in this section (caution must be taken not to wet electronic components). A final test for gas leakage must be made after purging the gas line. This test must be conducted with the unit operating and should include the furnace piping and gas valve. Never use an open flame to check for a gas leak.

IMPORTANT: Care must be taken not to wet electronic components during leak test. Wetting the primary ignition module may damage its circuitry and cause a hazardous situation. If wetting occurs, dry moisture from all leads, terminals, and electronic components using a hair dryer or similar means or wait at least 24 hours for the circuit to fully dry before energizing the burner circuit.

The furnace and its individual gas valve must be disconnected from the gas supply during pressure testing of the gas supply system at pressures in excess of 1/2 PSIG or 14.0" wc.

I. INSTALLATION OF NATURAL GAS PIPING

The installation of the gas piping and the following test procedures must be performed by a qualified installer or service person.

1.The following chart is to be used as a guide in sizing natural gas supply piping. The input loading of all gas appliances installed on any main or trunk line must be totaled to determine its needed carrying capacity.

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