TO Professional folks:
I need your help on determining what me and the other tech did wrong!
5ton Heatpump outside unit was working and about 12 years old. we replaced about 3ft of low & high pressure line outside that goes to the heatpump. vaccum the system and tried to fill it up with R22. place the termostat on cool and turn it on. we had to kick start the switch on the heatpump, but the Low pressure gauge goes to high (clockwise) and the high pressure guage goes to zero(counter clockwise) the we have to stopped the procedure becuse the compressor and the low pressure line gets very hot.
Note: we did not do anything with the wireing. and want to understand what has happend? would you advise if you know what is happening?
I believe some how this has stock in heat mode! is it?
Thanks in advance for your help.