21
20
MR45 Refrigerant Flow
Refrigerant liquid and vapor are pulled through
the machine by the pressure difference created
by the compressor For maximum performance,
increase the IN pressure and reduce the OUT
pressure See Tech Tips (page 12)
Compressor
Input
Pressure
Sensor
Output
Pressure
Sensor
OUT
Port
IN
Port
Recovery
Cylinder
(typically)
System
(typically)
Manifold
(knob control)
Condenser
(microchannel)
Dynamic Pressure Measurement
MR45 pressure readings are designed only
for monitoring pressures Do not use MR45 for
diagnostic pressure measurements
If a system’s pressure is stable, MR45 pressure
readings will be close to your other pressure
gauges
If a system’s pressure is changing, pressure
measurements at different locations within that
system will be different For every 3 feet of 1/4”
hose, the pressure may have a difference of
approximately ± 20 psig
