Trane UD1C100A9H51B, UD1D120A9H51B GAS Piping, Sequence of Operation Thermostat Call for Heat

▲! WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow the safety warnings exactly could re- sult in serious injury, death or property damage. Never test for gas leaks with an open flame. Use a commer- cially available soap solution made specifically for the detection of leaks to check all connections. A fire or ex- plosion may result causing property damage, personal injury, or loss of life.

fLEFT SIDE PIPING (STANDARD)

RIGHT SIDE PIPING (OPTIONAL)

TOP VIEW OF RIGHT SIDE PIPING

▲! WARNING

TO PREVENT AN EXPLOSION OR POSSIBLE INJURY, DEATH AND EQUIPMENT DAMAGE, DO NOT STORE COMBUSTIBLE MATERIALS, GASOLINE OR OTHER FLAMMABLE VAPORS OR LIQUIDS NEAR THE UNIT.

Installer’s Guide

GAS PIPING

This unit is shipped standard for left side installation of gas piping. A piping knockout is also provided in the right side for an alternate piping arrangement. The in- stallation of piping shall be in accordance with piping codes and the regulations of the local gas company. Pipe joint compound must be resistant to the chemical reac- tion with liquefied petroleum gases.

Refer to piping Table 9 for delivery sizes. Connect gas supply to the unit, using a ground joint union and a manual shut-off valve as shown in Figure 24. National codes require a condensation drip leg to be installed ahead of the controls as shown in Figure 24.

The furnace and its individual shut-off valve must be dis- connected from the gas supply piping system during any pressure testing of that system at test pressures in ex- cess of 1/2 psig.

The furnace must be isolated from the gas supply piping by closing its individual manual shut-off valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig.

▲! CAUTION

Use a backup wrench on the gas valve when installing gas piping to prevent damage to the gas valve and manifold assembly.

NOTE:

Maximum pressure to the gas valve for natural gas is 13.8" W.C. Minimum pressure is 5.0" W.C. Maximum pressure to the gas valve for propane is 13.8" W.C. Minimum pressure is 11.0" W.C.

All gas fittings must be checked for leaks using a soapy solution before lighting the furnace.

DO NOT CHECK WITH AN OPEN FLAME!

The following warning complies with State of California law, Proposition 65.

▲! WARNING

Hazardous Gases!

Exposure to fuel substances or by-products of incomplete fuel combustion is believed by the state of California to cause cancer, birth defects, or other reproductive harm.

SEQUENCE OF OPERATION

THERMOSTAT CALL FOR HEAT

R and W thermostat contacts close signaling the control module to run its self-check routine. After the control module has verified that the pressure switch contacts are open and the limit switch(es) contacts are closed, the draft blower will be energized.

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