Digital Control Operation

920-087-04

Temperature Display

The Friedrich digital PTAC is shipped from the factory to display the desired room temperature on the LED readout.

The unit can be conﬁgured to display the room temperature by simultaneously pressing the ‘Cool’ and ‘High Fan’ buttons for three seconds the display will show an ‘R’ for one seconds to acknowledge the change. The unit will display the setpoint

whenever the ‘Temp’ or buttons are pressed and then switch back to room temperature.

To revert back to displaying the setpoint only press the ‘Cool’ and ‘Low Fan’ buttons for three seconds simultaneously, the unit will display an ‘S’ for one seconds to acknowledge the change.

ºF vs. ºC Display

The unit is factory conﬁgured to display all temperatures in degrees Fahrenheit (ºF). To switch to degrees Celsius press the ‘Fan Only’ and ‘Low Fan’ buttons simultaneously for three seconds. The display will show a ‘C’ as acknowledgement of the change.

To revert back to ºF press the ‘Fan Only’ and ‘Low Fan’ buttons simultaneously for three seconds. The display will show an ‘F’ as acknowledgement of the change.

Cooling Mode

Pressing the ‘Cool’ button while the unit is in any mode, including off, will put the unit into cooling mode. Adjust the temperature readout to the desired room temperature and the unit will cycle the compressor on and off to maintain a comfortable room. The compressor will come on anytime that the room temperature is 1.8°F above the desired temperature. The fan operation is dependent on the fan mode selected, either continuous or cycling. See page 16 for fan cycle control.

Heating Mode

Pressing the ‘Heat’ button while the unit is in any mode, including off, will put the unit into heating mode.

Heat Pump Models (PDH)

When the ‘Heat’ button is pressed initially the unit will energize the electric resistance heat to quickly bring the room to the set temperature. When the desired room temperature falls 1.8°F below the desired set temperature the unit will cycle the compressor on and operate as a heat pump to maintain the room temperature while running more efﬁciently than resistance heat only models. If the room temperature should fall more than 5°F from the set temperature the unit will run the resistance heater. The fan operation is dependent on the fan mode selected, either continuous or cycling. Dip switch 5 controls the fan mode, see page 16 for setting.

When the outdoor coil temperature falls below 30°F for more than 2 minutes the unit will operate the resistance heaters and not the compressor. When the outdoor coil temperature reaches 45°F the compressor will be allowed to operate again.

Figure 12

Digital Control Panel

Heat/Cool Models (PDE)

After pressing the ‘Heat’ button, adjust the temperature readout to the desired room temperature and the unit will cycle the resistance heat on and off to maintain a comfortable room. The heater will come on anytime that the room temperature is 1.8°F below the desired temperature. The fan operation is dependent on the fan mode selected, either continuous or cycling. Dip switch 5 controls the fan mode, see page 16 for setting.

Emergency Heat Operation

In the event of a compressor failure in heat pump mode the compressor may be locked out to provide heat through the resistance heater. This feature ensures that even in the unlikely event of a compressor failure the room temperature can be maintained until the compressor can be serviced. Dip switch 7 controls the emergency heat setting, see page 16.

Fan Mode

Fan Only

Pressing the ‘Fan Only’ button will run the fan to allow for air circulation in the room without operating the compressor or heater regardless of the room or set temperature. The fan speed selection is made by pressing either the ‘High Fan’ or ‘Low Fan’ button.

Cycle/Continuous

The owner may choose between fan cycling or fan continuous mode based on property preference. (Note: Even heat monitoring and quiet start/stop fan delay only operate in fan cycle mode) Fan continuous mode is used to keep constant airﬂow circulation in the room during all times the unit is ‘ON’. Fan cycle will conserve energy by only operating the fan while the compressor or electric heater is operating. Dip switch 5 controls the fan mode, see page 16 for setting.

HEAT PUMPS specifications

Friedrich Heat Pumps are designed to provide efficient heating, cooling, and dehumidification solutions for various applications, including residential, commercial, and industrial settings. Renowned for their innovative technology and commitment to sustainability, Friedrich has become a recognized name in the HVAC industry.

One of the primary features of Friedrich Heat Pumps is their energy efficiency. These systems utilize advanced inverter technology, allowing the compressor to adjust its speed according to current heating or cooling demands. This leads to significant energy savings compared to traditional systems, which operate at a constant speed. By maintaining a more consistent indoor temperature, Friedrich Heat Pumps reduce energy consumption and lower utility bills.

In addition to energy efficiency, Friedrich offers a variety of models to suit different needs. The range includes air-source heat pumps, which extract heat from the outdoor air, and geothermal heat pumps, which utilize the stable temperatures found underground. This versatility allows users to select a system that best fits their specific climate conditions and application requirements.

Friedrich Heat Pumps also feature smart technology integration, making them a perfect choice for modern smart homes. Many models come equipped with Wi-Fi capabilities, allowing users to control their system remotely through a smartphone app. This feature not only enhances convenience but also allows for enhanced energy management, enabling users to monitor and adjust their heating and cooling schedules for optimal efficiency.

Another notable characteristic is their quiet operation. Friedrich Heat Pumps are engineered with noise-reducing features, making them suitable for residential areas where noise may be a concern. This focus on quiet performance ensures that users can enjoy a comfortable indoor environment without disruptive sound.

Durability and reliability are also key attributes of Friedrich Heat Pumps. Built with high-quality materials and rigorous testing processes, these systems are designed to withstand varying environmental conditions and provide long-lasting performance. Regular maintenance is further simplified with easy access to essential components, prolonging the system's lifespan.

In conclusion, Friedrich Heat Pumps stand out for their energy efficiency, innovative technologies, and superb performance characteristics. With options suitable for a wide array of applications, they are an excellent choice for anyone looking to enhance their indoor climate control while reducing their environmental footprint. Their advanced features, silent operation, and reliability make them a preferred option for modern heating and cooling solutions. Whether for residential or commercial use, Friedrich Heat Pumps offer a perfect blend of comfort, efficiency, and sustainability.