Issue:
Can a circuit be locked out?
Resolution:
The CGAF does not have a circuit lockout function.
One way of doing a "circuit lockout" would be to disconnect the saturated condenser temperature sensor (thermistor).
This could ba accomplished locally on the chiller by installing a toggle switch to open the circuit for the sensor. It could also be possible with a BAS using a hardwired point to open the circuit.
The only drawback would be that the CGAF control would display a diagnostic. This diagnostic is auto-reset type.
There is no way to do this via the chillers controller. It must be done by either disconnecting the liquid line solenoid valve (if the chiller has one) for that circuit or by opening up the circuit breakers on the compressor contactors. These will generate a diagnostic by will allow the other circuit to run.
Notes:
The demand limit (kW limit) optional feature, will not lockout a circuit. On a two circuit chiller when two compressors are commanded on, the controls will turn on one compressor on each circuit before starting a third compressor.
Changes:
Other Question/Problem/Cause Statements:
- Can a circuit be locked out?
- Can I lockout a refrigerant circuit?
- Can demand limit or kW limit function help lockout a refrigerant circuit?
Facts:
- Air-Cooled Chiller - Intellipak (CGAF)
Document Identifier: DOC-82480
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.