For about 40 years, I have been working with energy management and other control systems where control wires and cables must be run underground for short and long distances. Lightning and transient suppression on such lines has always been a problem, and no low cost solution will protect such...
I thought I knew how to charge HVAC and HP equipment but I am slightly confused by measurements made on my own new system that I just put in. The system is a two speed 3ton/2ton carrier AC (only) with TXV and the 58mvc furnace. Nominally, it all works fine, but I am not understanding the sight...
I know that the optimum method of charging a HVAC system is to evacuate and weigh in the refrigerant. Then check the superheat to be around 10F in cooling mode. (No.. I frequently do NOT have the manufacturer's chart for the equipment I have to service!)
My second best way is to install a...
Carrier Residential Heat Pumps specify that if lines are longer than 90ft that a bidirectional solenoid valve be placed in the liquid line near the outdoor unit to eliminate refrigerant being able to flow back into the Compressor unit during the OFF cycle.
1) I am thinking that this must be...
My job is to interface various HVAC and other equipment to Building Automation Systems. I have just (about) completed the interface of a Carrier Infinity Heat Pump to a standard Building Automation Controller. This involved complete replacement of the existing Infinity HP controller so as to...
Lets say that I have a 48000 btu/h Condensing unit. In HIGH capacity mode, the inlet temp is (for example) 75F and the outlet air temp is 50F. Lets assume the capacity is actually 48,000btu/h for this case.
Then If, in LOW capacity mode with the same air flow the outlet air temperature is...
