Arrived onsite for ac maintenance and startup after coil replacement on 1 system.. Asked customer to turn AC on to confirm operation. Checked all electrical. Found a fault in the Electrical Safety Circuit. Homeowner elected to not repair at this time. Chemically Cleaned outside unit, measured pressures for 410a at 67/143psi outside temperature at 48 degrees. Added 1.13 lbs of 410a. Measured 95/165 with 4 sub cooling . Measured temperature drop at 20 degrees. Cleaned evaporator coil and Cleaned condensate trap. System running as it should.
Removed old warranty coil 3 ton installed new 3-ton warranty coil. Perform pressure test evacuated coil under 500 microns also pre-charged system. Need to return for spring maintenance and check charge. It is about 40° here today
Arrived onsite for heating maintenance 1 gas fired furnace. Turn heat on and confirmed operation. Brushed and Wiped down furnace blower cabinet and gas burners. Burners fired and are in good working order. No visual impingement detected. Checked electrical. Measured 42 degree heat rise. Cleaned the flame sensor. System is operating as it should.
Arrived onsite for freezing line set in AC mode. Performed diagnostic and found system significantly low on 410a refrigerant. 50psi. Performed quick nitrogen test. Placed system under 245psi. Used bubble solution to inspect for leaks. Did not find a leak. Did not hear hissing of a leak. Left system under nitrogen pressure 245. Will send estimate for isolation nitrogen pressure test to determine where the system is losing refrigerant.
Received a call that the furnace was not operating, upon arrival I found that the main control fuse for the furnace was blown. I replaced the fuse with a little popper resettable breaker and cycle the system. The furnace started up and I confirmed that it is operating and heating properly and that the blower motor is working. I switch the unit over to cooling and found that as soon as the time delay went through that the popper blue, upon further investigation I found that the contactor in the condenser has a burnt coil and is causing the fuse to blow. The contacter will need to be replaced. Replaced the failed control, mounted and wired in as necessary. Started up the system in cooling mode and confirmed that the condenser and blower motor for the furnace are now operating and the unit is cooling properly. Switched the thermostat over to heat and confirm that the furnace is also turning on and operating properly.
Performed heating maintenance on a gas-fired furnace and confirmed operation of two zones. Cleaned the blower cabinet, gas burners, and flame sensor. Checked electrical components and measured a temperature rise of 60°F. The system is operating as it should. Homeowner needs a new polarized filter, and the UV bulb is operational but due for replacement. Installed the blower guard, but it continued to turn off the furnace. Diagnosed the issue with the mechanical pressure switch and blower guard control board. Contacted Amana Recall support, and it was confirmed the blower guard solution won't work. A replacement metal drain pan for the evaporator coil will be sent to the homeowner, with labor covered by Amana.
