Infinity/Evolution Inverter Units

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This installation was on a 4-story home, and the tech had not yet gone to the basement to troubleshoot the “infinity” water source heat pump, as he was told he by the homeowner. He was in the attic at the infinity furnace above the 4th floor. He was getting his dcv in the proper range on his A and B green plug on the air handler, 3 to 4 vdc. His indoor board ohm reading was in range, 28k to 32 k. The tech ohmed out the A and B thermostat wires on the water source heat pump from the upstairs. His ohm reading was not in range of a normal infinity board. His reading was around 64.4k. The tech then made the long walk to the basement where the “geothermal heat pump” was located. Bingo.

Now get out there and organize some zone wiring!

Zone equipment would be identified as indoor unit- blue black/ outdoor unit-blue green:

Close-up of two wrapped wire bundles with multicolored insulated strands on a white background

When it comes to working on the infinity/evolution systems, there are several inverter-driven outdoor units. They all have nicknames, different specification, and different diagnostic methods. For the average technician, it would be extremely difficult to memorize all of this data.

How can you tell them apart?

For starters, they all have a different SEER rating, this make them have different model numbers (3 different HP and 3 different AC). Second, the inverters have different manufactures, so they physically look different. I have collected a picture for the electrical section for each different set of models. I will group them with interesting facts about the models along with their nicknames. I like to tell people: we have three at this time, and as each Ac/Hp increases with seer, the number of components in the electrical section increases.

1. The first in SEER sequence is the HP 18 SEER/ AC 19 SEER. It is nicknamed the 5 STAGE. It is recognized by having an “all in one” inverter, all of the components are tucked very tightly into a single kit.

Inverter made by Toshiba
Typically, 25%-100% in “5 stages”
Rotary compressors
Outdoor fan motor is 3 phase
Model numbers: 25VNA8/ 24VNA9 & 288BNV/189BNV

3) The Third in SEER sequence is the HP 24 SEER/ AC 26 SEER. It is nicknamed: Next Gen Greenspeed/ Next Gen Extreme & 2nd Gen Greenspeed/ 2nd Gen Extreme. It is recognized by have the inverter at the top in a white box. Then several more items mounted below: control board, transformer, filter board, reactor(s).