Arrived on site for no cooling. Customer said that the unit can cool the house around late evening but during the day it struggles. Famous that would be set to 72 it would only be at 76 lowest. Air handler and condenser turned on normally. Inserted temperature probes and manometer into the unit. Hooked up a few piece gauges on the condenser to check out pressures. The pressure's on the unit were pretty low. Low side being 42 and high side being 220. Temperature difference inside the house was 10°. Recharged the unit with 3 lb and 3 oz of refrigerant. Low side went up to 103 high side went up to 270. Temperature difference was increased from 11 to 23, the supply vent went from supplying 62° to 48°. And gave a condenser outside a light wash from the outside with some chemical water to get better readings. Customer acknowledge of the job that was done today, recharging the unit, acknowledge and signed off.
Return to replace the broken drain line for the second floor unit, cut out the old steel line and installed a new 1-in PVC trap. Installed a couple of PVC 90° elbows and piping to allow the water to run away from the unit. Primed the drain line and confirm that everything is draining properly. While on site I also checked out rooftop unit number two because it had tripped overnight, the machine has been reset and is operating. We will order tattletales and install them on below and high pressure circuit to help us determine what is tripping the machine.
Perform the maintenance for both AC systems, confirm that both sets of filters are clean as they were replaced in the fall. Confirm that both humidifiers were turned off and shut off the water supply for the second floor humidifier. Installed all of my wireless probes and started up both systems, allowed both units to run and confirm that both zones for each system is operating. Both units are working and operating properly at this time, the upstairs unit may be slightly low on refrigerant, however due to the cooler temperature outside and low heat load inside I do not want to charge it at this time. If on a warmer day the machine is not cooling properly we may need to return to add some refrigerant.
Performed the heating maintenance for both furnaces, replaced both of the 20x25x4 filters. Serviced the humidifier for the second / third floor furnace, start it up both furnaces and checked operation of all safety controls. Checked all wiring connections, checked the operation of the combustion blower motors. Check the heat exchangers and cleaned the flame sensors. Both furnaces are operating properly. I set the humidistat at 45% humidity to allow it to provide as much humidity as possible to the upstairs area. At some point we may want to look into adding a new humidifier for the basement furnace to help increase the humidity level in the winter.
