Heating, Air Conditioning, Fridge, HVAC/need answer

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Question
1,overcharging a system with refrigerant (freon) will cause the head pressure to be(answer) #2,If a compressor has faulty valves, the head pressure would be (answer) #3 all air-conditioning unit must be grounded electrically to(answer) #4 to locate leaks, which of the following should be built up in all parts of the system (answer) #5, If the condenser fan motor goes out and the unit continues, it will cause (answer) #6, If the evaporator coil is clogged  so almost no air passes through, which of the following will happen (answer) #7 A vacuum pump is used to (answer) #8, There are two types of compressors in popular use, they are(answer) #9, A zero reading on a freon gauge manifold equals.(answer) # 10, What metering device is most common on apartment air conditioners (answer) #11, A low freon charge is likely due to a _________ in the system (answer) #12, you have just replaced a compressor which failed mechanically, what else would you do before you start the unit again (answer) #13, If the condenser coil is dirty, the head pressure will? (qnswer). could you please provide me these answer. thanking you in advance.

Answer
Charles,

1, Increase above it's normal operating range

2, lower than normal or would be equalized with the low side pressures

3, unpainted metal, eventually ground wire going back to the main distribution center ground.

4, nitrogen and trace refrigerant should be added ,if system has no refrigerant( built up in all parts of the system????? )do not know what that means

5. Higher than normal head and suction pressures,

6, Coil to ice

7,remove moisture/non condensible from system

8, Scrolls and Reciprocating

9,O psi,no refrigerant in system

10, chances are it's a piston ( fixed orifice # then second chance a TEV Thermostatic Expansion valve

11,Leak

12, verify new compressor has continuity between all three legs,and checking the compressor for ground BEFORE installing,verify correct voltage to compressor,if system has fixed orifice metering device,verify correct size  for system ,blow out lines with nitrogen,replace worn parts such as a compressor contactor and the run capacitor ( single phase units ),replace burnt wire tips, tighten all electrical connections,clean indoor and outdoor coil.Verify indoor coil is matched to outdoor unit.replace the filter drier ,add virgen refrigerant.??? ( compare the reclaimed refrigerant weight to nametag weight for correct charge ) But most important is to find out why the compressor failed in the first place.

13, increase

Did I Pass OK ??????????

Heating, Air Conditioning, Fridge, HVAC

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40+ years diversified experience.An HVAC/Refrigeration Self Employed Contractor since 1986. NATE Certifield. Answer questions pertaining to Residential and Commercial Air Conditioning , Warm Air Heating, Heat Pump systems.Mechanical and Electrical troubleshooting of these systems.Be as detailed as possible when describing problem.Packaged unit or split systems.No appliance questions.

Experience

Installation and Troubleshooting, Mechanical and Electrical, in following areas, Refrigeration ( Walk In and Reach In Coolers and Freezers ) Commercial Roof Top and Packaged Heating/Cooling ( Natural Gas,Propane, Electric, and Heat Pumps ) Computer Room Air Conditoning Systems,Commercial Residential Packaged and Split Systems Air Conditoning and Heat Pumps.Warm Air Oil , Natural and Propane Gas Heating systems.

Education/Credentials
Graduated from Private Technical School in 1975. An HVAC/Refrigeration Contractor . Have Unlimited Heating/Piping and Cooling Contractor License.Limited Sheetmetal Contractors License.NATE Certifield. York Certifield Master Heat Pump Technician 1986. Served 33 years combination Active Duty Air Force , Air Force Reserves and Air National Guard in the HVAC/Refrigeration Shop/Mechanical Shop. Troubleshooting/Installing HVAC/Refrigeration Equiptment Worldwide. Retiring in 2003 as a Senior NCO ,and a Mechanical Superintendent.

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