Once in a while we come across an older York Electric Heat RTU (rooftop unit). Instead of having a gas furnace within the rooftop HVAC unit, these units contain electric heat elements. The York RTU models are DCE and DHE as indicated below. A good giveaway that a RTU has electric heat is that there is no natural gas line running to it.
Accurate Heating & Cooling services RTU systems and other commercial HVAC equipment. We proudly serve the greater Omaha metro area. Call us today at 402-238-2425 and schedule an appointment. We have an A+ BBB rating and we have been in business for over 20 years. Of course, we also service residential HVAC equipment too.
The photo below shows one such older York Electric Heat RTU. Notice there is no gas piping going to the unit.
These York RTUs are completely assembled on rigid, permanently attached base rails. All piping, refrigerant charge, and electrical wiring is factory installed and tested. The supplemental field installed electric heaters have nickel-chrome heating elements.
A photo of the manufacturer’s sticker on the side of one such York Electric Heat RTU is shown below.
The various models of these York RTUs include the following. For a description of Older York RTU Model Number DCE Decoding, refer to this blog.
Second Generation York DCE Model RTUs
Third Generation York DCE Model RTUs
Fifth Generation York DCE Model RTUs
Sixth Generation York DCE Model RTUs
Second Generation York DHE (High Efficiency) Model RTUs
Third Generation York DHE (High Efficiency) Model RTUs
Older York Electric Heat RTU Nominal CFM Air Flow
Nominal Supply Air CFM for the various tonnage units is presented in Table 1 below.
The above CFM data is for air flow from the blower that is pictured below. The blower motor is seen sticking out a couple of inches above the blower assembly. And the evaporator coil can be seen in the background.
The blower assembly is located behind an access panel on the side of the unit. An image of the access panel removed showing the blower assembly is shown below.
RTU Air Filters
Typical installations make use of either one inch or two inch air filters. Air filters are installed ahead of the evaporator coil. The air filters must be kept clean or replaced with the same size and type. Dirty air filters will reduce the capacity of the unit and will result in frosted coils. The unit may also undergo a safety shutdown due to dirty air filters.
The photo below shows a two inch air filter in the filter rack. This unit also has an economizer which can also be partially seen in the below photo.
For information on what type of air filter is best for your application, refer to this blog. And for information on what MERV ratings for air filters mean, refer to this blog.
Older York Electric Heat RTU Wiring Diagrams
Typical power wiring for these older York RTUs is shown below.
Typical control wiring for these York RTUs is shown below.
The wiring diagrams above include a low voltage transformer in the circuit. For troubleshooting tips on low voltage transformers, refer to this blog. Newer Trane RTUs may contain a phase monitor. Refer to this blog for more information on the Trane phase monitor.
The above wiring diagrams can be seen in sharper detail in this York RTU installation_manual.Model DCE, DCG, DHE, DHG. Additional technical information is also available in the manual.
Many of the wiring components are centrally located behind the panel shown in the photo below.
The fused disconnect is shown in the above photo. It is attached to the outside of the RTU.
The Electric Heater Elements
This blog describes the York RTUs that contain electric heating elements instead of the more traditional natural gas burners. The field installed heaters are wired for single point power supply. This means that the power supply need only be brought into the single point terminal block. No separate power supply specifically for the heater elements is necessary.
The electric heaters are located within a central compartment inside the unit. The heater elements extend into the supply air chamber.
A photo of the electric heater element compartment is shown in the photo below. The actual resistive heater elements are physically located within the sealed compartment. The wiring terminals and other circuit components can be seen in the photo.
A photo of electric resistive heating elements from a residential air handling unit are shown below. The electric heater elements within this York RTU are similar in design to the elements shown below.
Older York Electric Heat RTU Nominal CFM Limitations
Nominal CFM limitations are shown in the table below for the various sizes of heater elements. These CFM values are also found in the York RTU Installation Manual which is provided earlier in this blog.
Older York Electric Heat RTU Error Flash Codes
The control board for the RTU shows flash codes associated with errors in the system. Flash codes are provided in the table below.
The Air Conditioner Portion of the older York Electric Heat RTU
These electric heated RTUs also contain a refrigerant circuit for air conditioning the space. The condenser portion of the RTU is shown in the photo below. The condenser fan and parts of the condenser coil are visible.
The photo below is taken from inside the compressor compartment. The condenser fan and motor can be seen near the top of the photo. Part of the condenser coil is seen in the back of the photo. And the very top of the compressor is shown at the bottom of the photo.
The photo below shows a better view of the compressor. Some refrigerant lines are also shown. As is part of the condenser coil on the right.
For additional information on York RTUs that are currently available, refer to the York website here.
Check out our Home Page here to learn more about us. And for information on the maintenance items homeowners can perform to keep their HVAC system operating efficiently, refer to this blog.
Accurate Heating & Cooling proudly services, repairs, and installs Rooftop HVAC Units. Refer to our Commercial page for more information. Call us today at 402-238-2425 to schedule an appointment. We have served the greater Omaha metro area for more than 20 years.