Q: Where should the sensor(s) be placed?
A: The temperature sensors are placed in the path of the delivered air. It is important to remember when you are deciding on the exact location of the sensors, that they need to get a good sample of the mixed air. We reccomend placing the sensor in the plenum at least 2 feet away from the coil if possible. On an upflow system if the sensor must be placed around a corner, do NOT place the sensor on the bottom of the duct as the air will blow right over top it. Instead place it near the top of the duct. For a downflow the same applys, but the sensor should be near the bottom of the duct.
Q: Can the control really eliminate the need for the bypass damper?
A: Yes, with the ecMModulator 4Z the fan speed can be limited by duct pressure. This allows multiple zones to be closed off without over pressurizing.
A: The ecMModulaor is compatible with variable speed motors that are programmed to accept a PWM input. The control is not compatible with X-13 or other speed tap motors.
Q: With the ecMModulator where should the 24VAC come from/should it come from the thermostat?
A: Ideally the control should be powered with a dedicated transformer, however it can be powered with any good 24VAC power source including that of the G and Ground terminals coming from the thermostat. If that is the case we recommend switching the thermostat to the FAN ON position.
Q: Will the OEM psc motors hold up with the fan handler control?
A: Most OEM motors are of much better quality then they used to be due to higher efficiency standards, and they work great with our controls. However there are still some cheap motors out there that can not be modulated. For those we recommend replacing them with either one of our Baldor motors, or any good aftermarket motor such as Emerson or GE. If you are not sure if you have a good motor the best way to know is to simply try it out. If its a poor quality motor then you will know right away by the sound that it makes. If it sounds smooth then great, there's no problem. If it makes a noticeable growling sound then the motor is of poor quality and should be replaced. If you or your customer does not wish to replace the motor, feel free to return the control to us for a full refund.
A: With this setup, you would want to use the HP control (or HP mode with the ecMModulator).