Orion System Water Source Heat Pump Module - Manual (Page 14)

Water Source Heat Pump Module
Technical Guide 14
Troubleshooting
Safety Monitoring
Proof of Flow
1. If there is a call for a compressor and there is no Proof of Flow
Input Enable:
• The module will wait up to 3 minutes to activate
the Proof of Flow Alarm LED(s) which will blink
the code indicating failure.
2. If the compressor(s) is (are) running and contact is opened for
2 seconds during Heat Pump Heating:
• Compressor(s) will be turned off.
3. If the compressor(s) are running and contact is opened for 2
seconds during Cooling:
• Proof of Flow Input will be ignored.
• No alarm will be generated.
Low Suction Pressure Detection
1. If any Circuit’s Suction Pressure falls below the Low Suction
Pressure Setpoint for longer than 1 minute, then the following
will occur:
• The compressor(s) on that circuit will turn off.
• Alarm LED will indicate Low Suction Pressure.
• Compressor(s) will be enabled again after 10
minutes if Suction Pressure rises above setpoint.
2. If any Circuit’s Suction Pressure falls below the Low Suction
Pressure Setpoint for longer than 1 minute a second time
within a two hour window, then the following will occur:
• The compressor(s) on that circuit will be locked out.
• Alarm LED will indicate a Compressor Lockout.
• Manual reset or change of mode (i.e., Cool to Heat)
must occur to reset back to normal operation.
Unsafe Suction Pressure Detection
If the Suction Pressure falls below the Unsafe Suction Setpoint for 5
seconds, the circuit’s compressor will be locked out immediately and
will not be allowed to restart. You will need to reset the Power to restart
the unit.
Low Leaving Water Temperature
NOTE: This safety monitoring is only performed in the Heat
Mode.
1. If the Leaving Water Temperature falls below setpoint, the
following will occur:
• The last compressor will turn off.
• Alarm LED will indicate Compressor Low Water
Temp Shutoff.
• Last compressor will be locked out until the
Leaving temperature is 6 degrees above setpoint.
2. If the Leaving Water Temperature remains below setpoint for
1 minute or falls 3 degrees below setpoint, the following will
occur:
• All compressors will deactivate.
• Alarm LED will indicate Compressor Low
Water Temperature Shutoff.
• All compressors will be locked out until the
Leaving Temperature is 12 degrees above setpoint.
Revised 12/28/11