Chiller, Water: Two Stage Freon R22
Automotive A/C troubleshooting, repair & service information HELP
Goodman Model No: CTS 090 - 3
Unit Label - Tag Data:
Goodman Manufacturing Corp.
Houston, Texas
Model No: CTS 090 - 3
Serial No: 9203117066
208/230 VAC 3 Ph 60 Hz
Minimum Circuit Breaker 40a Maximum Fuse 60a
1st Stage RLA = 15.4 LRA = 90
2nd Stage RLA = 30.7 LRA = 180
Fan Motor 1 FLA = 2.4 LRA = 5.2
Fan Motor 2 FLA = 2.4 LRA = 5.2
Factory Charge: 32oz R22
Factory Test Pressure: Low 150psig - High 472psig
Goodman Equipment "Ends - Terminates at Outlet of High Pressure Port - Valve (Liquid Line) and Inlet of Low Pressure Port - Valve (Suction Line)."
Evaporator/Water Tank/Heat Exchanger - Sight Glass - TEV/Bulb/Capillary - TS1/Bulb/Capillary/Contacts = "Engineered IN By Installer." (Many years ago, Before My Time, [ BMT ] ).
Believe it or not:
1. Asked to evaluate unit by owner = Runs some - intermittent - shuts down - not cooling.
Repair or replace? Local "famous - heavily advertised" HVAC Service Company suggests
purchase install a new unit at several thousand dollars.
When running, LP = 115-120psig and HP = 255-260psig, depending on parallax view.
2. Found TS1 wired in series with Solenoid Valve at termination points for MATC.
Yes, both wired in series with 3rd leg (phase) of Fan Motor 2!
3. Assume cutting-out on either LP or HP because Pump Down Solenoid Valve NOT Opening!
4. Found Schrader Valve Cap "Missing on Low Pressure Service Port."
5. Found TEV Bottom Cap Missing ( So know in my heart Super-Heat Mal-Adjusted ).
6. Straightened out wiring - added Time Delay.
7. Got unit running, producing 70°F Chilled Water on 80°F Day.
8. Have NOT found any actual components bad-malfunctioning.
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9. Have been 'tweaking Super Heat' with a very cautious approach.
Due to TEV Bulb location under tank sitting 3 to 4 inches
above gravel and debris, this Ole Boy with a bad back
refuses to dig it out to put thermometer there.
This is not a paying job, I'm not an HVAC man, 35 years as Controls Tech.
Getting 67-68°F Water on 95-96°F Day, with full use heat load on water.
My arbitrary (best guess) for TS1 SetPoint is 66°F. Dry Cleaning Solvent needs cool to 70°F.
However, on very hot day does not attain setpoint and cycle,
14-16 amps CM1 and 5-6 amps CM2, both run continous.
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10. On 80-85°F Day, unit cycles with 66°F SetPoint TS1.
Use a thermometer to test chilled water when TS1 Opens is Calibration Method.
Exceptionally good - works as advertised - considering old age of unit.
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11. Regardless of Tag Data, RLA = 30 Stage connected to CC1.
RLA = 15 Stage will NOT "pump it down"
within several minutes to open a pressure switch.
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12. Owner CLAIMS several (many) years ago, unit ran just one fan at times.
Guess something related to a MATC installed once upon a time.
I think it is a good thing for no MATC because any time a compressor runs and both condensors
are fed from both/either compressor then both fans should run any time either compressor runs.
Question is:
Can 'Super - Heat be adjusted enough to LOAD Compressor Motor to 66% to 75% of RLA?
ie...etc... Move more Freon does more work equals use more energy ...etc...ie
Specs on evaporator/heat-exchanger NOT available.