This document provides information about refrigerant manifold gauge sets and how to use them for HVAC service. It discusses the components of manifold gauge sets including hoses, gauges, and service ports. It explains how to identify high and low side service ports and gauges, how to connect the manifold gauge set to a vehicle's AC system, and how to read the pressures on the gauges. The goal is to teach technicians how to properly use manifold gauge sets to service air conditioning systems.

1. -- MANIFOLDS & SERVICE-- MANIFOLDS & SERVICE
PORTS --PORTS --
** STOP ME** STOP ME
WHEN ANWHEN AN
HOUR IS UPHOUR IS UP
****

2. REFRIGERANT THROUGH AREFRIGERANT THROUGH A
MANIFOLD GAUGE SET?MANIFOLD GAUGE SET?

3. REFRIGERANT THROUGH AREFRIGERANT THROUGH A
MANIFOLD GAUGE SET?MANIFOLD GAUGE SET?

4. REFRIGERANT THROUGH AREFRIGERANT THROUGH A
MANIFOLD GAUGE SET?MANIFOLD GAUGE SET?

5. REFRIGERANT THROUGH AREFRIGERANT THROUGH A
MANIFOLD GAUGE SET?MANIFOLD GAUGE SET?

6. REFRIGERANT THROUGH AREFRIGERANT THROUGH A
MANIFOLD GAUGE SET?MANIFOLD GAUGE SET?

7. WHICH GAGE READS LOW SIDEWHICH GAGE READS LOW SIDE
PRESSURE?PRESSURE?
WHICH GAGE READS HIGH SIDEWHICH GAGE READS HIGH SIDE
PRESSURE?PRESSURE?

8. ??

9. How can water be changed fromHow can water be changed from
a liquid to a gas?a liquid to a gas?
A. by removing its heat
B. by subjecting it to pressure
C. by subjecting it to a
vacuum
D. liquid is not changed to gas
E. both a and c above are
correct

10. WHICH GAUGE ISWHICH GAUGE IS
THIS?THIS?
HIGH SIDEHIGH SIDE
HOW DO YOUHOW DO YOU
KNOW?KNOW?
1. COLOR1. COLOR
2. NO VACUUM2. NO VACUUM
SCALESCALE
3. HIGH PRESSURE3. HIGH PRESSURE
SCALE 500 PSISCALE 500 PSI

11. WHICH GAUGE ISWHICH GAUGE IS
THIS?THIS?
LOW SIDELOW SIDE
HOW DID YOU KNOW?HOW DID YOU KNOW?
1. VACUUM SCALE1. VACUUM SCALE
2. PRESSURE SCALE2. PRESSURE SCALE
ONLY GOES TO 250ONLY GOES TO 250
PSIPSI
3. COLOR3. COLOR

12. CAN YOU READ THECAN YOU READ THE
TEMPERATURE /TEMPERATURE /
PRESSURE RELATIONPRESSURE RELATION
ON A GAUGE?ON A GAUGE?
PRESSURE
PSI
VACUUM
IN. HG
TEMPERATURE

13. HOW AREHOW ARE
GAUGESGAUGES
CALIBRATED?CALIBRATED?

14. WHAT ARE THE THREEWHAT ARE THE THREE
TYPES OF SERVICETYPES OF SERVICE
PORTS?PORTS?
HAND SHUT OFF VALVE - (OLD STYLE)
SHRADER VALVE - (SEVERAL TYPES)
QUICK DISCONNECT - (BOTH R-12 & R-
134A)

15. HAND SHUT OFF TYPE SERVICE VALVEHAND SHUT OFF TYPE SERVICE VALVE
(OLD STYLE)(OLD STYLE)

16. HOW DOES AHOW DOES A
HAND SERVICE VALVE OPERATE?HAND SERVICE VALVE OPERATE?
TO
SYSTEM
TO
COMPRESSOR
SERVICE PORTBACK
SEATED

17. HOW DOES AHOW DOES A
HAND SERVICE VALVE OPERATE?HAND SERVICE VALVE OPERATE?
TO
SYSTEM
TO
COMPRESSOR
SERVICE PORTMID
SEATED
(CRACKED)

18. HOW DOES AHOW DOES A
HAND SERVICE VALVE OPERATE?HAND SERVICE VALVE OPERATE?
FRONT
SEATED
TO
SYSTEM
TO
COMPRESSOR
SERVICE PORT

19. ??

20. What is the chemical symbolWhat is the chemical symbol
for mercury?for mercury?
• a. O
• b. Pb
• c. E
• d. Hg
• e. none of the above
are
correct

21. SHRADER TYPESHRADER TYPE
SERVICE VALVESERVICE VALVE
STANDARD R-12 TYPE
SMALL PORT TYPE
IS IDENTICAL BUT
THREAD DIAMETER
IS SMALLER
SMALL TYPE NEEDS
AN ADAPTER
NOTE
SHRADER
DEPRESSER

22. SHRADERSHRADER
DEPRESSORSDEPRESSORS
TO
SYSTEM
SHRADER PIN
TO COMPRESSOR

23. QUICK
DISCONNECT
TYPE
R-134A OR R-12
SHRADER TYPESHRADER TYPE
SERVICE VALVESERVICE VALVE
SLEEVE OPERATES
LIKE SHOP AIR FITTING

24. HIGH SIDEHIGH SIDE
SERVICESERVICE
VALVEVALVE
HIGH AND LOW SIDEHIGH AND LOW SIDE
SERVICE VALVESSERVICE VALVES
LOW SIDELOW SIDE
SERVICESERVICE
VALVEVALVE

25. HIGH AND LOWHIGH AND LOW
SIDESIDE
SERVICE VALVESSERVICE VALVES
LOW SIDELOW SIDE
SERVICE VALVESERVICE VALVE
HIGH SIDEHIGH SIDE
SERVICE VALVESERVICE VALVE

26. HIGH AND LOW SIDEHIGH AND LOW SIDE
SERVICE VALVESSERVICE VALVES
HIGH SIDEHIGH SIDE
SERVICE VALVESSERVICE VALVES
LOW SIDELOW SIDE
SERVICE VALVESSERVICE VALVES

27. SERVICESERVICE
HOSESHOSES
NOTENOTE HOSEHOSE COLORSCOLORS

28. QUICKQUICK
DISCONNECTDISCONNECT
FITTINGS.FITTINGS.
HOOKING A HFC - 134AHOOKING A HFC - 134A
MANIFOLD GAUGE SETMANIFOLD GAUGE SET
TO A SYSTEMTO A SYSTEM

29. FACTORY
HOSE
END
ADD ON
HOSE END
THE LAW & SHUTTHE LAW & SHUT
OFFSOFFS
HAND SHUTOFF
STYLES
ADD
ON
STYLE
QUICK DISCONNECT
STYLE

30. ??

31. When both of the manifoldWhen both of the manifold
hand valves are closed:hand valves are closed:
A. the low-side gauge shows the low-side
pressure
B. the high-side gauge shows the high-side
pressure
C. both gauges show the respective pressure
of the low-side and the high-side of the
system
D. both gauges indicate incorrect pressures
E. none of the above are correct

32. ADAPTERADAPTER
SS

33. R-12 MANIFOLD GAUGE SETR-12 MANIFOLD GAUGE SET
HOOKED UP TO A SYSTEM?HOOKED UP TO A SYSTEM?
LOW GAUGE HIGH GAUGE
MANIFOLD
GAUGE
SET
SERVICE
PORTS
HOSE
ADAPTERS

34. MANIFOLD GAUGE SETMANIFOLD GAUGE SET
HOOKED UP TO A SYSTEM?HOOKED UP TO A SYSTEM?
LOW PRESSURE
VALVE OPEN
HIGH PRESSURE
VALVE CLOSEDCLOSED
IMPORTANTIMPORTANT

35. WHERE ARE THEY?WHERE ARE THEY?
LOW
HIGH
HIGH AND LOW SIDEHIGH AND LOW SIDE
SERVICE VALVESSERVICE VALVES
95 EAGLE TALON95 EAGLE TALON

36. LET’S GO TO THE CAR AND SEELET’S GO TO THE CAR AND SEE
IF WE CAN FIND THE SERVICEIF WE CAN FIND THE SERVICE
PORTS AND HOOK UP THEPORTS AND HOOK UP THE
GAUGESGAUGES