GRUNDFOS INSTRUCTIONS
7.10 Digital Outputs.
All of the fault outputs can be wired as Normally Closed or Normally Open.
(refer to Connection diagram)
7.11 System 1 Interlock Output(DO1) is activated by all/any of the following alarms:
• System 1 Low Pressure
• System 1 High Pressure
• System 1 Sensor Fault
• Mains Power failure
These are the conditions under which the boiler or chiller on System 1 must be disabled.
The fault buzzer will cycle between ON for 5 seconds and OFF for 10 seconds continuously until muted by
pressing and holding the OK button for 2 seconds.
7.12 General Fault Output(DO2) is activated by all/any of the following alarms:
• Pump 1 Over Current
• Pump 1 Under Current
• Pump 2 Over Current
• Pump 2 Under Current
• Low Water
• High Water
• Low Glycol
• System 1 Flood Protection
• System 2 Flood Protection
• System 1 Excessive Consumption
• System 2 Excessive Consumption
• System 1 Low Pressure
• System 1 High Pressure
• System 1 Sensor Fault
• System 2 Low Pressure
• System 2 High Pressure
• System 2 Sensor Fault
The user may choose to disable the boiler or chiller on System 1.
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