Heat Controller Water Source Heat Pump manual 2.2.2Analog Inputs, 2.2.3Analog Output Description

WattMaster WHP Section 4

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 push-button override com- mands. The push-button is only active during unoccupied hours so a push during occupied hours has no effect.

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

COM1-3 - Common 1 thru 3. - This ties the common return of the first 3 outputs together.

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.

4-6 Start-Up and Troubleshooting