Startup and Adjustments, Functional Checkouts

Outdoor Fan Motor

If unit utilizes a 2-speed condenser fan motor, this motor will operate on low speed when in low cooling, and on high speed when in high cooling. A relay within the control area switches the fan motor from low to high speed using the call for high cooling as the trigger. Other models that utilize BLDC ﬁ xed torque variable speed fan motors will not require a relay.

Optional Equipment

Optional equipment requiring connection to the power or control circuits must be wired in strict accordance with current provisions of the NEC (ANSI/NFPA 70), with applicable local codes having jurisdiction, and the installation instructions provided with the equipment. Optional Equipment (low ambient control, hard start kits, etc.) should be installed in strict accordance with the manufacturer’s installation instructions

Transformer Upgrade Kit

If this 2-stage heat pump is installed in conjunction with a gas furnace and fossil fuel kit, the furnace transformer MUST be upgraded to one with a 60 VA rating or using the transformer upgrade kit

(904077). To upgrade the transformer:

•Remove the existing transformer and install the new 60 VA transformer.

•Remove the 3 amp fuse on the furnace control board and install the 5 amp fuse provided.

NOTE: The new transformer may be larger than the existing transformer that is mounted in the furnace. If this happens, mount the 60 VA transformer using one of the mounting holes in the furnace panel. On the other side either drill a 0.149 hole in the panel and use the existing fastener, or use a self-drilling fastener to secure the other side of the transformer.

STARTUP AND ADJUSTMENTS

Pre-Start Checklist

The following check list should be observed prior to starting the unit.

√Is the unit level?

√Is the wiring correct according to the wiring diagram and electrical codes?

√Inspect wiring for evidence of open, shorted, and/or improperly wired circuits.

√Are all the wiring connections tight? Check the condenser fan to make sure it turns freely.

√Is the overcurrent protection properly sized?

√Is the thermostat wired correctly? Is it installed in a proper location?

√Verify air ﬁ lters are clean and in place prior to operating the equipment.

√Verify the outdoor coil and top of the unit are free from obstructions and debris, and all equipment access/control panels are in place.

Thermostat

Set the thermostat’s system mode to OFF, the fan mode to AUTO, and adjust the temperature setpoint to its highest setting.

Outdoor Unit

Prior to applying electrical power to the outdoor unit, verify that the unit has been properly and securely grounded, and that power supply connections have been made at both the facility power interface and outdoor unit.

Verify the outdoor coil and top of the unit are free from obstructions and debris, and all equipment access/control panels are in place.

FUNCTIONAL CHECKOUTS

CAUTION:

These units have a crankcase heater factory installed. Wait 24 hours prior to performing a function checkout to allow forheatingofthecompressorcrankcase. Failure to comply may result in damage and could cause premature failure of the system.

Cooling

Gradually lower the thermostat temperature setpoint below the actual room temperature and observe that the outdoor unit and indoor blower energize. Feel the air being circulated by the indoor blower and verify that it is cooler than ambient temperature.Listen for any unusual noises. If unusual sounds occur, determine the source of the noise and correct as necessary.

Heating

If heating equipment (furnace, air handler) is provided with the system, lower the thermostat setpoint temperature to the lowest temperature setting and change the thermostat’s function mode to HEAT. The outdoor unit should stop running and the indoor blower will shut off after the preprogrammed delay.Increase the thermostat’s setpoint temperature to the maximum setting. Verify the heating equipment and the indoor blower energize after a short period of time. Feel the air being circulated by the indoor blower and verify that it is warmer than ambient temperature. Listen for any unusual noises. If unusual sounds occur, determine the source of the noise and correct as necessary.

NOTE: Other sources for heating (electric furnace, fossil fuel furnace, air handler with electric heat options, etc.) that interface with the heat pump should be functionally checked to

R-410A specifications

Nordyne R-410A is a widely recognized refrigerant used in modern air conditioning and heat pump systems, known for its efficiency and environmentally friendly attributes. As a hydrofluorocarbon (HFC) refrigerant, R-410A has become the preferred choice for many manufacturers seeking to meet stringent environmental regulations while providing superior cooling performance.

One of the main features of R-410A is its higher energy efficiency compared to older refrigerants like R-22. This efficiency is primarily attributed to its higher pressure capabilities, which allow for improved heat transfer and reduced energy consumption in residential and commercial systems. As energy costs continue to rise, the use of R-410A in HVAC systems offers a viable solution for reducing utility bills while maintaining optimal comfort levels.

R-410A is also non-ozone-depleting, which sets it apart from many traditional refrigerants. While older refrigerants have been phased out due to their potential harm to the ozone layer, R-410A presents a sustainable alternative that aligns with environmental goals. It features a zero ozone depletion potential (ODP), making it a responsible choice for installations concerned with ecological impact.

In terms of technology, R-410A works effectively in both air conditioning and heat pump systems, providing reliable cooling in hot conditions and heat in colder months. It is compatible with a variety of system designs and can excel in both residential and commercial applications. Moreover, the thermodynamic properties of R-410A ensure consistent and reliable performance, regardless of the external temperature fluctuations.

Another characteristic of R-410A is its ability to operate at lower temperatures, which enhances its versatility. This capability allows for the design of systems that can function efficiently in a wider range of climate conditions. As a result, HVAC technicians and contractors benefit from its reliability and performance, leading to less frequent maintenance and enhanced customer satisfaction.

Lastly, R-410A systems are equipped with advanced components that improve overall functionality. These systems often include variable-speed compressors, which optimize energy use based on cooling demand, and advanced refrigerant management technologies that ensure safe and efficient operation.

In conclusion, Nordyne R-410A stands out as a superior refrigerant due to its energy efficiency, environmental benefits, and adaptability across a range of HVAC applications. As the industry continues to innovate and shift toward sustainable solutions, R-410A remains at the forefront of refrigerant technology, ensuring homeowners and businesses alike enjoy efficient and eco-friendly cooling options.