York R-410A dimensions Heating Sequence Of Operation

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279550-YIM-A-0207

The “Heat” Jumper on the CFM selection board should be set to “A”.

Fan Only CFM:

When the connection is made from “R” to “G”, the fan only mode is activated. In this mode, the blower will deliver 75% of the cooling system CFM. This connection is factory set from the manufacturer, but can be field adjusted.

:

:

5

<<

<

Figure 14: Control Board Speed Tap Location

Table 17: Delay Profile

Delay Tap

Regional Climate Type

Jumper at “A”

Standard Setting

Jumper at “B”

Humid Climate

Jumper at “C”

Dry Climate

Jumper at “D”

Temperate Climate

Operation

The unit is controlled by a conventional heating/cooling thermostat common to this class of equipment.

Heating Sequence Of Operation

Heat

The control board begins a call for heat when W1 is energized (connected to R). The control ignores W2 until pilot ignition has been established.

The control checks to see if the pressure switch is open. If the pressure switch is closed, the control board flashes “3” on the LED and waits indefinitely for it to open. When the pressure switch is sensed as open, the control begins pressure switch proving period. If the call for heat is lost, the control goes back to Standby.

Pressure Switch Proving

The control board energizes the induced draft motor (High speed for 2 stage model) and waits for the low pressure switch

to close. When the low pressure switch closes, the control begins Pre-purge period. If the call for heat is lost, the control de-energizes the inducer without post-purge and returns to standby.

If the low pressure switch does not close within 10 seconds of inducer energizing, the control board flashes “2” on the LED. If the pressure switch does not close within 5 minutes of inducer energizing, the control shuts off the inducer for 30 seconds, then energizes the inducer for another 5 minute try to close the pressure switch. This cycle continues indefinitely until either the pressure switch is proved closed, or the call for heat ends.

Pre-purge

The control board monitors the low pressure switch and ensures it remains closed during pre-purge. If the pressure switch opens, the control goes back to pressure switch proving mode. The control waits for a 15 second pre-purge period, then begins the ignition trial

Ignition Trial Period

The control board energizes the pilot gas valve and spark outputs for an 85 second Ignition trial. The control de-energizes the spark when flame is sensed and enters a flame stabilization period.

If flame is not established within the ignition trial period, the control de-energizes the spark and gas valve and begins an inter-purge period before attempting another ignition trial.

If the call for heat is lost during an ignition trial period, the control immediately de-energizes spark and gas. The control runs the inducer motor through a post purge period before de- energizing.

If the pressure switch is lost during an ignition trial period, the control immediately de-energizes spark and gas. The control begins pressure switch proving before an inter-purge and re- ignition attempt.

Pilot Flame Stabilization Period

The control board de-energizes the spark output, and waits for a 2 second flame stabilization period before energizing the main gas valve.

If flame is lost during the flame stabilization period, the control board counts it as a flame loss and retries ignition or locks out flashing a “5” on the LED.

Heat Blower On Delay

The control board waits for 30 seconds and then energizes the indoor blower heat speed. Blower on delay time begins at the start of flame proving period in the trial for ignition.

If the thermostat demand for heat is removed, the control de- energizes the gas valve, energizes the blower on heat speed and initiates a post-purge and heat blower off delay.

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Unitary Products Group

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Contents DNX024-048 Ton GeneralRenewal Parts InspectionReference ApprovalsNomenclature InstallationInstallation Safety Information LimitationsComponent Location Unit Limitations Rigging And Handling LocationClearances Unit 4 Point Load Weight Weights and Dimensions Unit Accessory WeightsUnit Dimensions Unit DimensionsUnit Clearances1 Dimensions Front and Bottom Filters DuctworkRoof Curb Condensate DrainPower And Control Wiring Service AccessThermostat  92/7 75$162505 352*5$00$% +50267$721 Typical Field Power Wiring Diagram Electrical Data DNX024-048 Single Stage Gas Heat ARI Cooling PerformanceDNX024-048 Two Stage Gas Heat Gas Heat CompressorsPhasing Gas PipingPropane LP Gas Pipe Sizing Chart1 Natural Gas Pipe Sizing Chart1Flue Vent Hood Propane1 LP Gas Application Data-Single Stage Natural Gas Application Data-Single StageNatural Gas Application Data-Two Stage Propane1 LP Gas Application Data-Two StageAirflow Performance Side Duct ApplicationBottom Duct Application 1070 257 300 343 386 430 475 520 565 611 Cool Additional Static Resistance Indoor Blower SpecificationsBlower Speed Selection To Set Cooling CFM for DNX UnitsOperation Heating Sequence Of OperationRollout Switch Heat Blower Off DelayHigh Temperature Limit Switch Power InterruptionsCooling Sequence Of Operations Safety ControlsWelded Gas Valve Relay Response Start-Up Burner Instructions Pilot InstructionNatural Gas Adjustment of Temperature RiseChecking Gas Heat Input Direct Drive BlowerTypical Wiring Diagrams YIM-A-0207 YIM-A-0207 YIM-A-0207 YIM-A-0207 YIM-A-0207 YIM-A-0207 YIM-A-0207 410A Quick Reference Guide
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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.
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