I am struggling with a Carrier 30 HXC chiller using the Carrier Comfort Network. Compressor A is not starting but compressor B is starting and running fine. There is no available trips. I also disabled compressor B and then waited to see if compressor A will start but A does not come online. The communication seems fine and there is no trips or alarms showing.
Please help.
Hi Dallas, I disabled B by removing the plug on the on the discharge pressure transducer. This inhibits B from starting.
Can you please explain what you mean with the load factor?
First check to see if B comp. is programmed to be the lead compressor. If it is then A compressor will not come on until B has reached full load. Also see if in the configuration that you dont have a load limit. This will lock out a compressor even if the set points are not reached. Try putting the machine in test to activate both comps. I dont think your CCn is a factor from what youve said
Hi Chris, I have swapped from circuit B to circuit A and vice versa but still no change. As for the load limit is this the current limit you are refering to?
The load limit refers to how many comps or how much you allow the chiller to load up. Comp A may be configured not to run. What are your LEDs on the comp protection module reading. (red flashing yellow on green flashing ext..) Also have youy tried running the unit in test. Make sure your local swicth is in the OFF position.
If this is a Comfortlink panel,,, look in configuration and go to service menu. In that menu look for Compressor A1 enable. Is that compressor enabled or disabled. If your not getting alarms or alerts and the compressor is enabled. Get out the service manual and start at the beginning in configs and check all settings. I agree with Dallas Duster, it appears most likely the compressor is disabled. It would help if we knew what version we are dealing with. Provide the full model number.
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Originally Posted by Dallas Duster
