Refrigerant System Diagram - Mitsubishi Electric PKA-RP1.6GAL Service Technical Manual

4

REFRIGERANT SYSTEM DIAGRAM

4-1. Checking operation statuses PUHZ-RP • HA
4-1-1. Measurement points and items
•The table and diagrams below show the measurement item for each measurement point, and the pressure and temperature
near the ISO T1 standard operating conditions.
•Measure the temperature and pressure of each part by following the descriptions in the table.
•Measurement time: Be sure to wait until the refrigerant circuit has stabilized (30 minutes to 1 hour) before taking
measurements.
Measurement item
A
High pressure (MPa)
B
Low pressure (MPa)
C
Discharge pipe temperature (:)
D
Suction pipe temperature (:)
E
Indoor intake temperature (:)
F
Indoor outlet temperature (:)
G
Outdoor intake temperature (:)
H
Outdoor outlet temperature (:)
Notes : The operation statuses vary depending on the compressor's operating frequency because units are inverter-type.
Indoor heat
exchanger
4-1-2. Operation pressure ranges
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0
Pressure/temperature near JIS
standard operating conditions
COOL: 2.3 ~ 3.0
0.55 ~ 1.0
50 ~ 100
-2 ~ +18
COOL: 27:
COOL: 8 ~ 20
HEAT: 30 ~ 50
COOL: 35
COOL: 40 ~ 50
Ball valve
4-way valve
B
Linear
expansion Power
valve B
receiver
Stop valve
(with service port)
0.2 0.4
Suction pressure (MPa)
Connect the pressure gauge to the high-pressure check valve.
HEAT: 2.0 ~ 3.2
Connect the pressure gauge to the low-pressure check valve.
HEAT: 20:
HEAT: 7
HEAT: 0 ~ 5
Outdoor
heat exchanger
A
D
C
Compressor
Linear
expansion
valve A
Permissible operation range
Normal operation range
Overload operation
Standard operation
0.6 0.8 1
15
Measurement method, remarks
Measured with piping surface thermometer.
Measured with piping surface thermometer.
Can be displayed on remote controller.
Measured with piping surface thermometer.
Measured with piping surface thermometer.
1.2