Orion-system Water Source Heat Pump X Module User Manual download pdf (Page 27)

Technical Guide

WSHP-X Module

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.

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Orion-system Water Source Heat Pump X Module User Manual Page 27

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