Very Low Suction Pressure CGAM/ACS/ACX

Performing service on one circuit. Circuit is currently in a vacuum.

• Chiller will not start circuit that is not in alarm.
• Circuit in alarm is out of refrigerant.

• The very low suction pressure alarm is intended to protect the chiller when suction pressure transducers are assigned to the opposite circuit.
   

  Very Low Suction Pressure — Circuit 1	Chiller	Immediate	Latch	All [circuit in manual lockout]	The circuit's suction pressure dropped below (Low Pressure Cutout Septoint (kPa absolute) * 0.5) regardless of whether or not compressors are running on the circuit.  This diagnostic was created to prevent compressor failures due to crossbinding by forcing an entire chiller shutdown.	Local
  Very Low Suction Pressure — Circuit 2	Chiller	Immediate	Latch	All [circuit in manual lockout]	The circuit's suction pressure dropped below (Low Pressure Cutout Septoint (kPa absolute) * 0.5) regardless of whether or not compressors are running on the circuit.  This diagnostic was created to prevent compressor failures due to crossbinding by forcing an entire chiller shutdown.	Local

1. Lock out the circuit which is either out of refrigerant or under a vacuum during repair.

2. Unbind the suction pressure transducer for the circuit which is Locked Out.

3. Verify all other devices are bound correctly in Binding View (Kestrelview) or LLID Binding (Tracer TU).

4. Reset alarm.

   Comm Loss: Suction Pressure Transducer Comm Loss: Suction Pressure Transducer Comm: Suction Pressure Xdcr

   Circuit

   Immediate

   Latch

   All

   Continual loss of communication between the MP and the Functional ID has occurred for a 35-40 second period.

WARNING:

Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.