York GF9S*DH, GM9S*DH, GY9S*DH Ignition System Sequence, Calculating the Furnace Input Natural GAS

268890-UIM-B-0607

There is an accessory kit (1PK0601) available from Source 1, which has the following items:

•1 - 12” (30 cm) length x 1/8” (0.3 cm) diameter tubing

•2 – pieces of 4” (10 cm) length x 1/8” (0.3 cm) diameter tubing

•1 - 5/16” (0.8 cm) tee

•1 – 5/16” (0.8 cm) x 1/8” (3.175 mm) reducing coupling

•1 – 1/8” (0.3 cm) adapter

There is a accessory kit (1PK0602) available from Source 1, which has the following items:

•12” (30 cm) length x 1/8” (0.3 cm) diameter tubing

•2 – pieces of 4” (10 cm) length x 1/8” (0.3 cm) diameter tubing

•1 - 5/16” (0.8 cm) tee

•1 – 5/16” (0.8 cm) x 1/8” (0.3 cm) reducing coupling

•1 – 1/8” (0.3 cm) adapter

•1 - Dwyer – Manometer

These items are required in order to properly perform the required star- tup procedure.

IGNITION SYSTEM SEQUENCE

1.Turn the gas supply ON at external valve and main gas valve.

2.Set the thermostat above room temperature to call for heat.

3.System start-up will occur as follows:

a.The induced draft blower motor will start and come up to speed. Shortly after inducer start-up, the hot surface igniter will glow for about 17 seconds.

b.After this warm up, the ignition module will energize (open) the main gas valve.

c.After flame is established, the supply air blower will start in about 30 seconds.

IMPORTANT: Burner ignition may not be satisfactory on first startup due to residual air in the gas line or until gas manifold pressure is adjusted. The ignition control will make 3 attempts to light before lock- ing out.

With furnace in operation, check all of the pipe joints, gas valve connec- tions and manual valve connections for leakage using an approved gas detector, a non-corrosive leak detection fluid, or other leak detection methods. Take appropriate steps to stop any leak. If a leak persists, replace the component.

The furnace and its equipment shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 PSI (3.45 kPa).

The furnace must be isolated from the gas supply piping system by closing the equipment shutoff valve during any pressure testing of the gas supply piping system.

CALCULATING THE FURNACE INPUT (NATURAL GAS)

NOTE: Burner orifices are sized to provide proper input rate using natu- ral gas with a heating value of 1030 BTU/Ft3 (38.4 MJ/m3). If the heat- ing value of your gas is significantly different, it may be necessary to replace the orifices.

NOTE: Front door of burner box must be secured when checking gas input.

1.Turn off all other gas appliances connected to the gas meter.

2.At the gas meter, measure the time (with a stop watch) it takes to use 2 cubic ft. (0.0566 m3.) of gas.

3.Calculate the furnace input by using one of the following equa- tions.

FIRE OR EXPLOSION HAZARD

Failure to follow the safety warnings exactly could result in serious injury, death or property damage.

Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections. A fire or explosion may result causing property damage, personal injury or loss of life.

32 Unitary Products Group