I just replaced my sump pump because the old one would not shut off and it was 8 years old. I had to replace the pvc piping coming out of the pump that comes up and out of the pit. I did not drill a 'relief hole' in the new pipe(the old pipe had one), could this be causing excess pressure that is...

I have an older Dayton model 3E473A wall furnace that has a bad gas valve. Grainger no longer sells replacement parts for this furnace. I went on line and using the part no. of the existing bad gas valve (Robert Shaw 7000 AERB-5-S7C), I found a cross referenced replacement gas valve (GSV720402). My...

A) In a typical thermostat is the reversing valve controlled directly based on mode of heat or cool regardless of the unit actively cooling or heating Mode is Heat = reversing valve on (furnace can be actively on or off) Mode is Cool = reversing valve off (AC can be actively off or on) ...

Can someone explain to me the difference between these? I am trying to write a lab report and have no idea what I'm writing about.