York DGPA077ABTA, DGPHO56ABTA GAS Piping, Installation and Checking of GAS Line, Pilot Adjustment

GAS PIPING

INSTALLATION AND CHECKING OF GAS LINE

Gas Supply piping must be sized in accordance with the rec- ommendations contained in National Fuel Gas Code (ANSI-

Z223.1, NFPA-54) unless local codes or regulations state oth- erwise.

Matedals used and pipe sizing for U.S. manufactured homes must comply with requirements contained in Manufactured Homes Al19.1, Recreational Vehicles Al19.2 and H.U.D. Title 24, Section 3280.705 and any local or state codes.

NOTE: The gas line inlet on the gas valve is 1/2-14 N.ET The gas line may be installed through the furnace floor or fur- nace side to the gas valve.

F& CAUTION

To install gas line and to connect it to the gas valve, care must be taken to hold gas valve firmly to prevent misalignment of the bumer orifice, or to damage gas valve which could result in improper heating, explosion, fire or asphyxiation.

DO NOT USE EXCESSIVE PIPE SEALANT ON PIPE JOINTS. Pipe sealant, metal chips or other foreign material that could be deposited in the inlet of the gas valve, when gas pipe is installed or carried through the gas piping into the gas valve inlet after installation, may cause the gas valve to malfunction and could result in possible improper heating, explosion, fire or asphyxiation. Also, pipe sealant must be resistant to Propane gas.

Where regulations require, a main shut-off valve shaft be installed externally of furnace casing.

After piping has been installed, turn gas on and check aft connections with a leak detector or

soap solution.

Never use open flame to test for gas leaks as fire or explosion could occur.

Do not test the fuel system at more than 14" HZC. after furnace has been connected to fuel line. Such testing could void the warranty. Any test run above 14" WC. may damage furnace control valve which could cause an explosion, fire or asphyxiation.

ICAUTION!

If the gas input to the furnace is too great because of excessive gas pressure, wrong size orifice, high altitude, etc., the burnerflame will be sooty and may produce carbon monoxide, which could result in unsafe operation, explosion, and/ or fire or asphyxiation.

A dirt leg may be required by some local cedes to trap mois- ture and contaminations.

035-16328-002 Rev. C (0902)

For natural gas operation, the furnace is designed for 7" W.C.

inlet gas pressure. Pressure to main burner is then reduced to 3 1/2" W.C.

For Propane gas operation, the furnace is designed for 11" W.C. inlet gas pressure. Pressure to main burner is then reduced to 10" W.C.

IMPORTANT - When converting gas valve from or to Pro- pane gas, it will be necessary to change main burner orifice to prevent an underfired or overfired condition. See label inside lower furnace door for complete instructions.

Pilot Adjustment

On models equipped with standing pilot ignition, the pilot should be adjusted so that the flame is approximately 1" in height (500 BTU / hr.). This will allow proper burner ignition without excessive fuel usage. The pilot adjustment screw is located on the top of the gas valve.

Observing Burner Operation

1,	Observe burner to make sure it ignites. Observe color of
	flame. On natural gas the flame will burn blue with appre-
	ciably yellow	tips. On Propane	gas a yellow flame may
	be expected.	If flame is not the	proper color call a quali-

fied service technician for service.

2, Let furnace heat until blower cycles on.

3.Turn thermostat down.

4.Observe burner to make sure it shuts off.

5.Let the furnace cool and blower cycle off.

kWARNING]

Should overheating occur, or the gas supply fail to shut off, shut off the manual gas valve to the furnace and allow bomer to run until furnace cools down and blower shuts off before shutting off the electdcal supply.

If any abnormalities are observed when checking for correct operation, such as burner failing to ignite or to turn off, sooty flame, etc., call your nearest authorized service technician as shown in the Service Center List included in the home owner envelope with the furnace.

If Furnace Fails to Operate Properly

1.Check setting of thermostat - and position of HEAT/ COOL switch if air conditioning is installed. If a set-back type thermostat is employed be sure that the thermostat is in the correct operating mode.

2.Check to see that electrical power is ON.

3.Check to see that the knob or switch on the gas control valve is in the full ON position.

4.Make sure filters are clean, return gdfies are not obstructed, and supply registers are open.

5.Be sure that furnace flue piping is open and unob- structed.

If the cause for the failure to operate is not obvious, do not attempt to service the furnace yourself. Call a qualified ser- vice agency or your gas supplier.

Unitary Products Group 19