WattMaster Water Source Heat Pump, Installation & Operation Manual

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WattMaster WHP Section 4
4-6 Start-Up and Troubleshooting
2.2.2 Analog 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.
2.2.3 Analog Output Description
AOUT - Analog Output - This output is not used.
2.2.4 Relay 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.