15
REFRIGERANT SYSTEM DIAGRAM
4
Measurement item
COOL: 2.3 ~ 3.0 HEAT: 2.0 ~ 3.2
0.55 ~ 1.0
50 ~ 100
-2 ~ +18
COOL: 27
:
HEAT: 20
:
COOL: 8 ~ 20
HEAT: 30 ~ 50
COOL: 35 HEAT: 7
COOL: 40 ~ 50 HEAT: 0 ~ 5
Measurement method, remarks
Connect the pressure gauge to the high-pressure check valve.
Connect the pressure gauge to the low-pressure check valve.
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.
High pressure (MPa)
Low pressure (MPa)
Discharge pipe temperature (
:
)
Suction pipe temperature (
:
)
Indoor intake temperature (
:
)
Indoor outlet temperature (
:
)
Outdoor intake temperature (
:
)
Outdoor outlet temperature (
:
)
Pressure/temperature near JIS
standard operating conditions
A
B
C
D
E
F
G
H
Notes : The operation statuses vary depending on the compressor's operating frequency because units are inverter-type.
Outdoor
heat exchanger
Stop valve
(with service port)
Power
receiver
Linear
expansion
valve B
Linear
expansion
valve A
4-way valve
Compressor
Ball valve
Indoor heat
exchanger
A
B
C
D
Overload operation
Standard operation
Permissible operation range
Normal operation range
0
0.2
0.4
0.6
0.8
1
1.2
Suction pressure (MPa)
Discharge pressure (MPa)
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
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.
4-1-2. Operation pressure ranges
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