Panasonic CS-HZ25UKE Service Manual

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13.8 <Reference> Analysis method for no error code, no cooling / no
warming
13.8.1 Preparation for appropriate diagnosis
In order to obtain appropriate operation characteristics, minimum 15 minutes or more operation time [testing
operation (rated operation)] is required.
1. Method of rated operation (rated operation)
For the models which have two buttons of “emergency operation and forced cooling operation”, press forced
cooling button once. For the models which have only emergency operation button, press the button once for 5
seconds and when hear “beep” sound, release the button. Then, cooling operation starts.
2. Checking the mal-functions of indoor / outdoor units
1) Any obstacles against heat release and air suction? (short circuit)
(Forget to remove the outdoor unit cover or fallen leaves blocking the outdoor unit)
2) Are the indoor unit air filters clean? (obstructing heat suction)
3) Is the setting temperature on the remote controller correct? (is the setting temperature set at lower/higher
than the room temperature?)
13.8.2 Understanding and verification of refrigerant cycle
Heat exchanger
Heat exchanger
Compressor
（COMP）
4-way
valve
Condenser
（COND）
Expansion
valve
Liquid side
2-way
valve
Gas side
3-way
valve
High temp
High pressure
Air
Mid temp /
High pressure
Liquid
Low
temp/
Pressure
liquid
Low temp
Low pressure
Air
Evaporator
（EVA）
FM
Fan
Fan
Capillary tube
Indoor unit Temp difference
Suction temp ＜Cooling＞ ８
or more
Release temp ＜Heating＞ １
４ or more
＊
Measured after 15 mins with strong
fan operation
(Cooling)
G
as pressure 0.9～1.2MPa
Low temp /
Low pressure
Air
Low temp /
Low pressure
liquid
(Cooling Heating )
High temp /
High pressure
Air
Mid temp /
high pressure
liquid
Low temp /
Low pressure
Liquid
Low temp /
Low pressure
Air
Mid temp /
High temp
liquid
(Heating)
G
as pressure 2.2～ 3.0MPa
Release temp
Outdoor temp
Suction temp
Heat exchanger
temp
Heat exchanger
temp
High temp / high
pressure
Air
「Indoor 「」 Outdoor」
1. Measuring temperature
1) Indoor unit suction temperature, release temperature, temperature difference, → Measure by thermometer
2) 2-way valve pipe temperature in cooling mode is low temperature (benchmark：5 ~ 10°C), in heating mode
is medium temperature (benchmark：25 ~ 35°C).
3) 3-way valve pipe temperature in cooling mode is low temperature (benchmark：7 ~ 15°C) in heating mode is
high temperature (benchmark：38 ~ 50°C).
2. Measuring electric current
 Measuring electric current in operation → check by clump meter (refer to table of technical characteristic
guideline)
3. Meauring pressure
 Measuring gas pressure → check the pressure by manifold gauge (refer to table of technical characteristic
guideline)

Panasonic CS-HZ25UKE Specifications

General

Brand	Panasonic
Model	CS-HZ25UKE
Category	Air Conditioner
Language	English