Troubleshooting Challenge: A Convenience Store that’s Not Comfortable
It’s the middle of summer and your customer, who can’t provide you with any helpful information about the history of this situation since they just recently purchased the business, is complaining that the temperature inside their small convenience store won’t get comfortable whenever the outdoor temperature gets over 90°F. The equipment is a three-phase, 5-ton rooftop unit (see figure one), and when you evaluate the operation of the system, you find the following:
You also note that after several hours of continuous operation, all system components remained relatively unchanged. All continued to operate and none shut down on any safeties.