TTK 1K TXV system

1. TXV SYSTEMSTXV SYSTEMS

2. EXPANSION VALVE SYSTEMSEXPANSION VALVE SYSTEMS
NAME THE 5 MAIN PARTS OF THIS SYSTEM?
COMPRESSOR
CONDENSER
RECIEVER/DRIER
TXV

3. TXV
WHAT IS THE PURPOSE OF AN
"EXPANSION VALVE"?
WHAT IS THE PURPOSE OF AN
"EXPANSION VALVE"?

4. ??

5. Technician A says air conditioning cleans, cools, and dries the air.
Technician B says air conditioning must not be allowed to remove
moisture from the air because it will freeze on the evaporator.
Technician C says the surface of the evaporator must stay above 32oF.
Who is correct?
Technician A says air conditioning cleans, cools, and dries the air.
Technician B says air conditioning must not be allowed to remove
moisture from the air because it will freeze on the evaporator.
Technician C says the surface of the evaporator must stay above 32oF.
Who is correct?
•
a. Technician A c. Technician C
• b. Technician B d. both A & B are correct
• e. both A & C are correct

6. TXVTXV
TO EVAPORATORTO EVAPORATOR
LIQUIDLIQUID

7. TXV OPERATIONTXV OPERATION
COURTESY
HONDA

8. WHERE DOES THE EXPANSION
VALVE'S REMOTE BULB FASTEN?
WHERE DOES THE EXPANSION
VALVE'S REMOTE BULB FASTEN?
CAPILLARY
SENSING BULB
CAPILLARY
TUBE
EXPANSION
VALVE

9. TXV CAPILARY
BULB POSITION
TXV CAPILARY
BULB POSITION
COURTESY
HONDA

10. WHERE DOES THE EXPANSION
VALVE'S REMOTE BULB FASTEN?
WHERE DOES THE EXPANSION
VALVE'S REMOTE BULB FASTEN?
THE TXV AND
THE SENSING
BULB MAY BE
FOUND
INSIDE THE
EVAPORATOR
HOUSING
REMOTE BULB

11. EVAPORATOR
REFRIGERANT LEVEL IN THE
EVAPORATOR
REFRIGERANT LEVEL IN THE
EVAPORATOR
A.A. LIQUID ENTERING THE TXV.LIQUID ENTERING THE TXV.
B.B. EVAPORATING LIQUID ABSORBING HEAT.EVAPORATING LIQUID ABSORBING HEAT.
C.C. GAS AND LIQUID ABSORBING HEAT.GAS AND LIQUID ABSORBING HEAT.
D.D. SUPERHEATED GAS LEAVING EVAPORATOR.SUPERHEATED GAS LEAVING EVAPORATOR.

12. INTERNAL EQUALIZING
EXPANSION VALVE
INTERNAL EQUALIZING
EXPANSION VALVE
NEXT SLIDE FOR BETTER VIEWNEXT SLIDE FOR BETTER VIEW

13. TXV
INTERNALLY
EQUALIZED
TXV
INTERNALLY
EQUALIZED
EQUALIZING
PASSAGE

14. EXTERNAL EQUALIZING
EXPANSION VALVE
EXTERNAL EQUALIZING
EXPANSION VALVE
NEXT SLIDE FOR BETTER VIEW

15. EXTERNAL
PASSAGE
TUBE
TXV
EXTERNALLY
EQUALIZED
TXV
EXTERNALLY
EQUALIZED

16. COMPARISON OF TXV TYPESCOMPARISON OF TXV TYPES

17. WHAT IS A CHRYSLER "H" BLOCK -
"CYCLING CLUTCH SYSTEM"?
WHAT IS A CHRYSLER "H" BLOCK -
"CYCLING CLUTCH SYSTEM"?
IT’S A TXV SYSTEM WITH THE INLET ANDIT’S A TXV SYSTEM WITH THE INLET AND
OUTLET OF THE EVAPORATOR FLOWINGOUTLET OF THE EVAPORATOR FLOWING
THROUGH IT.THROUGH IT.

19. CHRYSLER “H” BLOCKCHRYSLER “H” BLOCK
EXPANSION BLOCK AT
FIREWALL

20. OTHER MANUFACTURERS THAT
USE EXPANSION BLOCKS ARE:
OTHER MANUFACTURERS THAT
USE EXPANSION BLOCKS ARE:
• A. TOYOTA
• B. MERCEDES
• C. FORD
• D. CHRYSLER
• E. ????
TOYOTA TXV BLOCK

22. ??

23. Which is more serious, a flooded evaporator or a
starved evaporator? Why?
Which is more serious, a flooded evaporator or a
starved evaporator? Why?
• a. A flooded evaporator, because the refrigerant will not
evaporate.
• b. A flooded evaporator, because liquid refrigerant may
return to the compressor, damaging the compressor.
• c. A starved evaporator, because sufficient heat will not
be absorbed in the evaporator.
• d. A starved evaporator, because refrigerant will be
superheated on return to the compressor, damaging the
compressor.
• e. none of the above are correct