WattMaster WHP | Section 4 |
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3.2Loop Controller Inputs & Outputs
3.2.1Analog Inputs
AIN1 - Return Water Temp - This input accepts a two wire 10K Type III ther- mistor temperature sensor. The sensor measures 10,000 Ohms @ 77°F. The re- sistance drops as the temperature increases. The sensor is connected between this terminal and the GND terminal.
AIN2 - Supply Water Temp - This input accepts a two wire 10K Type III ther- mistor temperature sensor. The sensor measures 10,000 Ohms @ 77°F. The re- sistance drops as the temperature increases. The sensor is connected between this terminal and the GND terminal.
AIN3 – Proof of Flow/Loop Pressure - This input accepts a differential pressure contact closure for proof of flow or a
AIN4 - Outdoor Air Temp - The OA temperature is used to determine if pumps should be turned on during off periods, to prevent freezing. When the OA tem- perature is below 40° F, the pumps will be turned on.
AIN5 - Manual Reset Input - Used to restart equipment after alarm condition has occurred. When this input is shorted to GND by a momentary pushbutton, a signal to restart is sent.
AIN7 – Phase Loss – If a phase monitor is being used, a normally open contact is connected here. When a loss of phase is detected, this contact closes shutting down the Loop Controller.
GND - Common return wire. This point is tied to ground on the Loop Controller.
3.2.2Analog Output
This connector carries a
AOUT1- Pump VFD Signal - If you have selected the variable speed pump op- tion this output signal is used to control the loop pressure.
AOUT2 - Proportional Heat Signal - This output may be used when a modulat- ing signal is required to control heat addition temperature.
GND - Common return wire, this point is tied to GND on the Loop Controller.
