HVAC
Options->HVAC
RHS will track the cycles of up to three stages of an HVAC system: a two stage heat pump plus emergency electric heater for example. Logging is enabled in the ”HVAC” tab.
“Enable” is checked to enable stage activity logging.
“Number of stages” select the number of stages in the HVAC system that will be logged.
“Loop temperature sensors” The input and output temperature of fluids in closed and open loop heat pump systems can be monitored and recorded for each cycle. Check this box to advise RHS that sensors are attached. At present, the only sensor supported is the Phidget precision temperature sensor. Analog input 6 is used for the input to the heat pump and analog input 7 is used for the output of the heat pump.
“Measurement settling time” sets a temperature stabilization period at the end of a cycle to accommodate the sensor’s lag time. A period of 2 minutes is usually sufficient. This may be less if the sensor is attached to copper as opposed to PVC pipe. Watching the temperature in the HVAC tab after a cycle can provide insight into the most appropriate time to set.
”Calibration” of the loop temperature sensors is required to minimize the differences introduced in the manufacturing process. To perform calibration, sensors should be setup close together in open air with no drafts. They should be allowed to stabilize for at least five minutes. Move the sliders until both sensors read the same value plus or minus 0.1 C consistently.
