Heat Controller Water Source Heat Pump - Manual (Page 118)

WattMaster WHP Section 4
4-36 Start-Up and Troubleshooting
5.4.1 (continued)
AIN4
Outdoor Air Temp
1.9 volts (100
°
F) - 3.6 volts (40
°
F)
Typical is 2.5 volts @ 77
°
F
AIN5
Manual Reset
If the input is OPEN, the voltage will be greater than 5.0 volts
If the input is CLOSED, the voltage will be less than 0.5 volts
AIN7
Phase Loss
If the input is OPEN, the voltage will be greater than 5.0 volts
If the input is CLOSED, the voltage will be less than 0.5 volts
AIN1-Exp. Bd.
Fire Alarm
If the input is OPEN, the voltage will be greater than 5.0 volts
If the input is CLOSED, the voltage will be less than 0.5 volts
Caution: AIN1 – Fire/Smoke input must be connected
to the AIN1- GND terminal. If it is not used, a jumper must be
installed, since this is a normally closed contact input. If this
is not done the system will not operate.
AIN2-Exp. Bd.
Request to Run
If the input is OPEN, the voltage will be greater than 5.0 volts
If the input is CLOSED, the voltage will be less than 0.5 volts
Condition Action
SWT, RWT, OAT Input voltage reads too
low 1. Check for shorts or other wiring errors.
2. Defective Sensor. Check using the chart.
3. High temperature at sensor. See chart.
SWT, RWT, OAT input voltage reads too
high 1. Check for open circuit wiring errors.
2. Defective sensor. Check using the chart.
3. Low temperature at sensor. See chart.
LPR (when optional 0-5VDC Loop Pres-
sure Sensor is used) input voltage reads too
low. 1. Check for shorts or other wiring errors.
2. Defective Sensor. Check using the chart.
3. High pressure at sensor. See chart.
LPR (When Loop Pressure Switch is used)
input voltage reads too high. 1. Check for open circuit wiring errors.