Overall Experience
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DCM 3: AC complete, replaced (1) 20x25x2, (4) 16x16x2, (4) 16x20x2 filters. Systems 1 and 3 are both fully functional and operating within manufacturer specifications at this time, temperatures and pressures are appropriate for outdoor and indoor weather conditions. System 2’s economizer has failed not allowing the luvers controlling the outdoor air to open causing the system to recycle return air when outdoor temperature is below indoor temperature. Recommend replacing economizer or bypassing economizer. Irregardless of repair system should function properly when outdoor temperature gets above 70*.
Arrived to No Heat / Cool, thermostat not illuminated Furnace power switch in off position. Previous repair on computers, technician must have thought he was turning off the light and turned off the furnace. Switches are now labeled Phot
Call for no Heat system not keeping up, on arrival thermostat set at 73 reading 73, went onto roof and found that system is heat strips only 7.9KW which is about 2 tons of heating, system is a 5 ton system and the heat strips are not able to keep up when temperatures get low, recommend upsizing heat strips but will need a electrician to run a dedicated breaker for the heat strips.
Thermostat was set for a 20k sensor, using 10k sensor. Thermostat was reading 80* indoor temp, now properly reading 69* indoor temp. Adjusted fan speed from Med-Lo to High.
Call for no Heat, thermostat was calling on arrival, Checked RTU and found that it was missing a leg of power, checked in the junction box and found that there was a burnt up wire, it is recommended to get a electrician to come out and repair.
DCM1 :Service 1 of 2 ;Heat, Changed (1) 16x20x1, Performed Heating Maintenance Per Checklist system is running at this time.
Removed existing filter dryer, TXV and Compressor. Installed new TXV, filter dryer and compress. Added 1 oz of acid away ( in accordance with product information chart ) Pressure tested system 178.5 psi with no reduction after 10 min test. Removed all moisture and non-condensable gases from refrigerant circuit by pulling a vacuum to 456 microns , rose to 495 after decay test. Added 12 lbs of R410A. Tested system. Functions as designed. Refrigerant pressures and temperatures are appropriate for indoor and outdoor conditions. Superheat of 11* and Subcool of 11*
DCM3 complete; AC, (1) 20x25x2, (4) 16x16x2 (4) 16x20x2 replaced. RTU# 2 and RTU #3 are fully functional. All components are operating within manufacturer specifications. Refrigerant pressures and temperatures are appropriate for indoor and outdoor conditions. RTU #1 has an 18* temp difference across the filter dryer. Compressor amperage lower than expected 12A with a listed RLA of 24. Would expect an amp draw of 18-20A. High and Low Pressures are within 45 psi. Compressor winding resistance is recommended to be no higher than .52 ohms. Measuring .68-.70 ohms across windings. Filter dryer is clogged/restricted. Compressor has likely failed and parts/debris associated with the compressor failure have clogged the filter dryer. It is possible that debris could’ve gotten past filter dryer ( though catching debris is one of its functions ) and entered the TXV. Compressor failure and TXV failure can’t be confirmed but components are still under warranty.
