Orion System Water Source Heat Pump X Module - Manual (Page 27)

Technical Guide
WSHP-X Module
27
Troubleshooting
Safety Monitoring for Dual Water
Circuit
Proof of Flow
There are separate inputs for System A and System B. System A pro-
vides water for Compressors A1 & A2 and System B provides water
for Compressors B1 & B2.
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.
• Proof of Water Flow A will disable compressors A1
and A2.
• Proof of Water Flow B will disable compressors B1
and B2.
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.
• Proof of Water Flow A will disable compressors A1
and A2.
• Proof of Water Flow B will disable compressors B1
and B2.
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 Compressor’s Suction Pressure falls below the Low
Suction Pressure Setpoint for longer than 1 minute, then the
following will occur:
• The compressor will turn off.
• Alarm LED will indicate Low Suction Pressure.
• Compressor will be enabled again after 10 minutes
if Suction Pressure rises above setpoint.
2. If any Compressor’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:
• That compressor 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 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.
On the larger units, there are two separate condenser/water sections and
each section (water system) has its own Leaving Water Temperature
Sensor. Each sensor will only affect the compressors associated with
that condenser/water section. The description below describes System
A. System B works the same but will affect Compressors B1 & B2.
1. If the Leaving Water Temperature for System A falls below
setpoint, the following will occur:
• Compressor A2 will deactivate if active.
• Alarm LED will indicate Compressor A2 Low
Water Temp Shutoff.
• Compressor A2 will be locked out until the Leaving
temperature is 6 degrees above setpoint.
2. If the Leaving Water Temperature for System A remains below
setpoint for 1 minute or falls 3 degrees below setpoint, the
following will occur:
• Compressor A1 will deactivate.
• Alarm LED will indicate Compressor A1 & A2 Low
Water Temperature Shutoff.
• Both Compressors will be locked out until the
Leaving Temperature is 12 degrees above setpoint.