Updating Your SMAN/Testo Gauges
October 17, 2024
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Some of you might have an older SMAN/Testo digital gauge. With the new refrigerants coming, you might need to update
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Technical Services Manager
North Georgia District
Recently we have been getting calls from techs about NIMS installations. One caller recently said he had an infinity system with an “infinity” water source heat pump with a no cool call (as told by the homeowner to the tech). The infinity interface was giving a 179 code, or no communicating with the outdoor unit.
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.
He then found the NIMS installation with a geothermal heat pump. “The infinity” geothermal heat pump is what he was told by the homeowner. But in reality, it was a geothermal heat pump communicating by use of the NIMS installation
He was ohming out the NIMS module. We suggested that he try running new thermostat wire, or using 2 extra wires in the bundle not being used. Once he made the changes to the wires on the NIMS and the indoor infinity furnace, guess what. The code 179 went away. The geothermal heat pump then began operating. Communication was established. So thus, it was not communicating with the older thermostat wires, but operated and communicated with the indoor infinity furnace and UI with the newer thermostat wires.
So, the NIMs installations is definitely a tool all techs could use if needed on certain installations. The Network Interface Module (NIM) is used to interface the following devices to the Infinity ABCD bus so they can be controlled by the Infinity System. The following devices do not have communication ability and the NIM is required to control: • A Heat Recovery Ventilator / Energy Recovery Ventilator (HRV/ERV) (when zoning is not applied). • A non-communicating single-speed heat pump with Infinity furnace (dual fuel application only). • A non-communicating two-speed outdoor unit (R-22 Series-A unit)
More information on the NIMS can be found in HVAC Partners, or on your Carrier or Bryant service app.
So what have we learned from this article?
Disclaimer: The technical statements, information and recommendations contained herein are believed to be accurate as of the date hereof, but Mingledorff’s does not make representations or warranties, express or implied, as to its accuracy, its completeness, or the results to be obtained. The information is being provided for informational purposes only and is intended for use by persons having adequate skill and expertise regarding the proper selection, use and application of the products and recommendations and at their own risk and discretion.
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