Summary of TR-134
Page 4
Products, inc. Tr-134 system service manual january 8, 2010 page iv list of effective pages section page date title i january 8, 2010 record of revisions ii january 8, 2010 iii january 8, 2010 list of effective pages iv january 8, 2010 table of contents v january 8, 2010 introduction 1 september 15,...
Page 5
Products, inc. Tr-134 system service manual january 8, 2010 page v table of contents subject page title i record of revisions ii table of contents iii introduction 1 air conditioning system description 1. Vapor cycle system description 2 2. Electrical driven compressor systems 4 3. Engine driven com...
Page 6
Products, inc. Tr-134 system service manual sep 15/95 page 1 introduction 1. Purpose the purpose of this system service manual is to provide detailed instructions for the servicing, troubleshooting, checking and maintaining of the keith products, inc. Air conditioning systems using r134a refrigerant...
Page 7
Products, inc. Tr-134 system service manual sep 15/95 page 2 air conditioning system - system description 1. Vapor cycle system description the keith products vapor cycle air conditioning system uses liquid refrigerant r134a to cool the aircraft cabin. The major components for the r134a air conditio...
Page 8
Products, inc. Tr-134 system service manual sep 15/95 page 3 figure 1. Air conditioning vapor cycle system.
Page 9
Products, inc. Tr-134 system service manual march 6/02 page 4 2. Electrical driven compressor systems electrically operated systems use the aircraft electrical system and are operable in most normal flight modes. Air conditioning may be operated with ground external power or the aircraft electrical ...
Page 10
Products, inc. Tr-134 system service manual sep 15/06 page 5 3. Engine driven compressor systems engine driven systems use compressors that are engine mounted; or on some rotorcraft, driven off the tail rotor drive shaft. A pulley via a "v" type belt turns the compressor. A clutch mounted on the com...
Page 11
Products, inc. Tr-134 system service manual aug 21/06 page 6 refrigerant servicing 1. General the air conditioning system uses refrigerant r134a and the compressor lubricating oil used is polyolester oil viscosity grade (iso) 68. No other refrigerant or compressor oil should be used. Refrigerant r13...
Page 12
Products, inc. Tr-134 system service manual aug 21/06 page 7 2. Discharging system a. General the air conditioning system refrigerant must be discharged prior to disconnecting or removing components in the refrigerant loop. Federal law prohibits discharging refrigerant into the atmosphere. Use only ...
Page 13
Products, inc. Tr-134 system service manual aug 21/06 page 8 3. Evacuating system a. General the air conditioning system must be evacuated prior to charging the system with refrigerant. Evacuating the system removes any moisture that may be in the system. Use only an r134a compatible recycling/recov...
Page 14
Products, inc. Tr-134 system service manual aug 21/06 page 9 4. Charging system a. General use only r134a refrigerant when charging air conditioning system. Federal law prohibits discharging refrigerant into the atmosphere. Use only r134a compatible recycling/recovery unit when charging the air cond...
Page 15
Products, inc. Tr-134 system service manual january 8, 2010 page 10 5. Flushing system a. General the following procedure is used to whenever the compressor is replaced and when system contamination is suspected. B. Tools and equipment designation ref. No. Qty remarks keith hose coupler tool see pro...
Page 16
Products, inc. Tr-134 system service manual january 8, 2010 page 11 8. Disconnect all of the expansion valves from the evaporator assemblies. Attach the hose coupler tool in place of the expansion valves on all evaporator assemblies. Use caution in handling the expansion valves. Do no support the ex...
Page 17
Products, inc. Tr-134 system service manual january 8, 2010 page 12 19. Inspect the expansion valves for damage and debris. Replace if any contamination is found. Use new o-rings. 20. Inspect the binary pressure switch for damage and debris. Flush with dry nitrogen or clean dry compressed air before...
Page 18
Products, inc. Tr-134 system service manual aug 21/06 page 13 general servicing 1. General general service procedures are provided to keep the air conditioning system operating at peak efficiency. Procedures are provided for general maintenance tips, inspection intervals, maintenance of the plumbing...
Page 19
Products, inc. Tr-134 system service manual aug 21/06 page 14 3. Plumbing system maintenance procedures a. General the following procedures are used to perform typical maintenance on the air conditioning system plumbing. Procedures are provided for hose or fitting replacement. New keith products air...
Page 20
Products, inc. Tr-134 system service manual january 8, 2010 page 15 d. Hose or fitting replacement (barb-lok hose fittings) note: if it is found that a hose or fitting has a leak, it will be necessary to replace the entire hose assembly. Follow the hose barb-lok instruction below: 1. Hose should onl...
Page 21
Products, inc. Tr-134 system service manual aug 21/06 page 16 4. Coil cleaning maintenance procedures a. General the following procedure is used for cleaning either evaporator or condenser coil. B. Tools and equipment designation ref. No. Qty remarks vacuum cleaner comm. Avail. 1 none coil cleaner c...
Page 22
Products, inc. Tr-134 system service manual aug 21/06 page 17 5. Expansion valve removal and installation a. General the following procedure is used to remove or install the air conditioning system expansion valve. B. Tools and equipment designation ref. No. Qty remarks sealant es49000-1 a/r none po...
Page 23
Products, inc. Tr-134 system service manual aug 21/06 page 18 (figure a) (figure b) (figure c).
Page 24
Products, inc. Tr-134 system service manual aug 21/06 page 19 6. Compressor maintenance procedures a. General the following procedure is used whenever the compressor is replaced or contamination is suspected. B. Tools and equipment designation ref. No. Qty remarks none - - none c. Compressor replace...
Page 25
Products, inc. Tr-134 system service manual aug 21/06 page 20 troubleshooting 1. General the procedures below present troubleshooting charts for the air conditioning system and the compressor. A diagnoses chart is presented for insufficient air conditioning system cooling. The performance characteri...
Page 26
Products, inc. Tr-134 system service manual aug 21/06 page 21 figure 3. Air conditioning system diagnosis chart.
Page 27
Products, inc. Tr-134 system service manual aug 21/06 page 22 3. Air conditioning system troubleshooting condition service pressure gauge reading probable cause corrective action insufficient refrigerant charge insufficient cooling. Bubbles appear in sight glass. Suction pressure: below normal disch...
Page 28
Products, inc. Tr-134 system service manual aug 21/06 page 23 condition service pressure gauge reading probable cause corrective action air in system insufficient cooling. Sight glass shows occasional bubbles. Suction pressure: above normal discharge pressure: above normal air mixed with refrigerant...
Page 29
Products, inc. Tr-134 system service manual aug 21/06 page 24 condition service pressure gauge reading probable cause corrective action faulty compressor insufficient cooling. Suction pressure: much above normal discharge pressure: much below normal internal problem in compressor, or damaged gasket ...
Page 30
Products, inc. Tr-134 system service manual aug 21/06 page 25 4. Compressor troubleshooting a. General the following procedures are used for troubleshooting the compressor. B. Tools and equipment designation ref. No. Qty remarks service pressure gauge comm. Avail. 1 none dc power supply a/r none c. ...
Page 31
Products, inc tr-134 system service manual aug 21/06 page 26 checks 1. General the following procedures are used to perform typical maintenance checks for air conditioning system refrigerant leaks, refrigerant charge and compressor oil level. Caution: do not operate air conditioning system with cond...
Page 32
Products, inc tr-134 system service manual january 8, 2010 page 27 3. Refrigerant system leakage check a. The system leakage check is to be performed in an area with an ambient temperature of 65 ° f or above. B. Install service pressure gage to low and high pressure r-134a service valves. C. Check f...
Page 33
Products, inc tr-134 system service manual january 8, 2010 page 28 reserved.