Chery QQ - Manifold Pressure Meter; Functions of the Manifold Pressure Meter

Chery QQ Service Manual
and vacuum. The vacuum range is 0-5X10
5
pa(0-760mmHg), the pressure scale starts
from 0 and range is over 4.2X10
5
pa(approximate 4.2kgf/cm
2
). The high-pressure
meter scale starts from 0 and range is over 21.1X10
5
pa(approximate 21.1kgf/cm
2
).
These two meters are fitted on the same seat, each end of which has a manual valve
and under which there are three path joint.
Joint of low-pressure meter, that connnects to low pressure pipe connector through a
hose.
70141
Manifold pressure meter
1- Lowe-pressure meter(blue) 2-high-pressure meter(red) 3- hose at high pressure
side (red) 4- hose for maintainance (yellow) 5- hose at low pressure side (blue)
Joint for high-pressure meter connects to the high pressure pipe with a hose. The
middle joint connects to the vaccum pump or refrigerant tank with a hose. Two
manual valves combined with three hoses make the manifold pressure meter have four
functions(as shown in below diagram)
Functions of the manifold pressure meter
positions of the high and low pressure valves functions
high and low pressure valves off Fault diagonosis for the refrigeration system
Low pressure valve on, high pressure valve off Filling refrigerant or refrigerant oil
in refrigeration system
Low pressure valve off, high pressure valve on Check leakage of the refrigeration system and
charge liquid quickly
high and low pressure valves on Evacuate the refrigeration system
Note: high and low pressure valves are on, which means that the two meters are connect ed to
refrigeration system and middle pipe respecdtively; high and low pressure valves are off, which
means that the two meters are disconnected to the middle pipe but connected to refrigeration
system.
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