WattMaster WHP | Section 4 |
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2.2.2Analog Inputs
This connector carries the analog and binary control input signals.
AIN1 - Space Temp - This input accepts a two wire 10K Type III thermistor tem- perature sensor. The sensor measures 10,000 Ohms @ 77°F. The resistance drops as the temperature increases. The sensor is connected between this terminal and the GND terminal. This input is also monitored for
AIN2 - Slide Adjust - If the OE212 or OE213 space temperature sensor is in- stalled, the sensor contains a slide adjust control for varying the current heating and cooling setpoints. If the OE210 or OE211 sensors are used, this input will not be used.
AIN3 - Discharge Temp - The discharge temperature reading is used to detect discharge air temperature and to monitor for equipment failure. Once the com- pressor has activated, the discharge air temperature has 10 minutes to change by 5°F or the controller assumes a mechanical failure has occurred.
AIN4 - Leaving Water Temp and/or Dirty Filter Alarm - Can provide status only water temperature and/or dirty filter contact closure. If both are used at the same time, water temperature will be lost when the dirty filter contact is closed.
AIN5 - Lockout - If this input is active all operations are terminated to protect the equipment.
GND - Common return wire. This point is tied to ground on the WHP Controller.
2.2.3Analog Output Description
AOUT - Analog Output - This output is not used.
2.2.4Relay Output Descriptions
OUT1 - Fan On/Off - The fan is enabled to run when this contact is closed.
OUT2 - Reversing Valve or Heat 1 - This output enables the reversing valve if you have configured the WHP Controller for a compressor and reversing valve configuration. If the WHP Controller is configured for individual staging of heat- ing and cooling (no reversing valve) then this output enables heating stage 1.
