Start-Up

279550-YIM-A-0207

Circulating Fan

When the thermostat calls for FAN, the thermostat terminal G is energized signaling the circulating fan to run at the heat speed 2 seconds after the G terminal is energized.

If a call for HEAT occurs, the circulating fan continues to run at the heat speed.

If a call for COOL occurs, the circulating fan switches to cool speed according to the fan delay profile selected in Table 17.

When the thermostat ends the call for FAN, the thermostat terminal G is de-energized, de-energizing the circulating fan.

Prestart Check List

Complete the following checks before starting the unit.

1.Check the type of gas being supplied. Be sure that it is the same as listed on the unit nameplate.

2.Make sure that the vent outlet air hood has been properly installed.

Operating Instructions

1.STOP! Read the information on the unit safety label.

2.Set the thermostat to the OFF position.

3.Turn off all electrical power to the unit.

4.DO NOT try to light the burners by hand. This appliance is equipped with an ignition device which automatically lights the burners.

5.Remove the access panel.

6.Turn the gas valve switch to the OFF position.

7.Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow B in the information on the unit safety label. If you don't smell gas, go to the next step.

8.Turn the gas valve switch to the ON position.

9.Replace the control access panel.

10.Turn on all electric power to the unit.

11.Set the thermostat to the desired setting.

12.If the unit will not operate, follow the instructions To Turn Off Gas To Appliance and call your service technician or gas supplier.

To Turn Off Gas To Unit

1.Set the thermostat to the OFF position.

2.Turn off all electric power to the appliance if service is to be performed.

3.Remove the control access panel.

4.Turn the gas valve switch to the OFF position. DO NOT FORCE.

5.Replace the control access panel.

Post Start Check List

After the entire control circuit has been energized and the heating section is operating, make the following checks:

1.Check for gas leaks in the unit piping as well as the supply piping.

2.Check for correct manifold gas pressures. See Checking Gas Input.

3.Check the supply gas pressure. It must be within the limits shown on rating nameplate. Supply pressure should be checked with all gas appliances in the building at full fire. At no time should the standby gas line pressure exceed 13.5", nor the operating pressure drop below 4.5" for natural gas units. If gas pressure is outside these limits, contact the local gas utility for corrective action.

Manifold Gas Pressure Adjustment

Small adjustments to the gas flow may be made by turning the pressure regulator adjusting screw on the automatic gas valve. Refer to Figures 15 and 16.

	Manual
	Gas Switch
	Pilot
	Adjustment
	(Remove Cap)	Electrical
		Electrical
		Connection
	Manifold
	Pressure
	Adjustment	½ NPT
	(Remove Cap)	(Outlet)
	Pilot Gas	Manifold
	Connection	Manifold
	Connection	Pressure Tap
		Pressure Tap

Figure 15: Single Stage Gas Valve Front

Unitary Products Group

R-410A specifications

York R-410A is a widely recognized and highly efficient refrigerant used in modern air conditioning systems. Developed as an environmentally friendly alternative to R-22, R-410A has gained popularity in the HVAC industry due to its numerous advantageous features and characteristics.

One of the main features of York R-410A is its ability to provide superior cooling performance. This refrigerant operates efficiently at both high and low temperatures, allowing systems using it to maintain optimal indoor climates even during extreme weather conditions. Its high energy efficiency ratio (EER) and seasonal energy efficiency ratio (SEER) ratings make it a preferred choice for energy-conscious consumers, resulting in lower energy bills and a reduced carbon footprint.

Technologically, York R-410A systems feature advanced compressor designs that enhance their overall reliability and performance. These compressors are often equipped with variable-speed technology, enabling them to adjust their output to match the cooling demands of the space. This not only improves comfort levels but also leads to efficient energy consumption, reducing wear and tear on the equipment over time.

Another significant characteristic of York R-410A is its non-ozone-depleting properties. Unlike its predecessor R-22, which is being phased out due to its damaging effects on the ozone layer, R-410A is designed to minimize environmental impact. Its lower global warming potential (GWP) further underscores its role in promoting sustainability within the HVAC sector.

Furthermore, York R-410A systems are engineered with enhanced safety features. The refrigerant is non-toxic and non-flammable, which makes it safer for use in both residential and commercial applications. Additionally, its high thermal stability reduces the risk of breakdown or leakage, contributing to longer system lifespans and lower maintenance costs.

In conclusion, York R-410A stands out as a cutting-edge refrigerant that combines efficiency, safety, and environmental responsibility. With its advanced technologies and remarkable characteristics, it meets the demands of modern air conditioning requirements while paving the way for a sustainable future in HVAC systems. Adopting York R-410A not only benefits individual users through improved comfort and lower energy bills but also plays a vital role in protecting our planet's ozone layer and mitigating climate change.

York R-410A dimensions Start-Up

Models: R-410A