Panasonic CS-CZ25ZKE - Page 37

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12.3.13 Evaluation of the Performance
 Operate the unit at cooling/heating operation mode for fifteen minutes or more.
 Measure the temperature of the intake and discharge air.
 Ensure the difference between the intake temperature and the discharge is more than 8°C during Cooling
operation or more than 14°C during Heating operation.
Note:
 During extremely cold winter, turn on the power supply and standby the unit for at least 15 minutes before test
run. Allow sufficient time to warm up refrigerant and prevent wrong error code judgement.
12.3.14 Installation of Dust Collector Filter
1. Open the front panel.
2. Remove the air filters.
3. Put the Dust Collector Filter into place as shown in illustration at right.
12.3.15 In Case of Reusing Existing Refrigerant Piping
Observe the followings to decide reusing the existing refrigerant piping.
Poor refrigerant piping could result in product failure.
 In the circumstances listed below, do not reuse any refrigerant piping. Instead, make sure to install a new piping.
- Heat insulation is not provided for either liquid-side or gas-side piping or both.
- The existing refrigerant pipe has been left in an open condition.
- The diameter and thickness of the existing refrigerant piping does not meet the requirement.
- The piping length and elevation does not meet the requirement.
 Perform proper pump down before reuse piping.
 In the circumstances listed below, clean it thoroughly before reuse.
- Pump down operation cannot be performed for the existing air-conditioner.
- The compressor has a failure history.
- Oil color is darken. ( ASTM 4.0 and above ).
- The existing air-conditioner is gas/oil heat pump type.
 Do not reuse the flare to prevent gas leak. Make sure to install a new flare.
 If there is a welded part on the existing refrigerant piping, conduct a gas leak check on the welded part.
 Replace deteriorated heat insulating material with a new one.
Heat insulating material is required for both liquid-side and gas-side piping.
12.3.16 Proper Pump Down Method
Discharge air
Dust Collector Filter
7
A
ir filter
Most Important Process
Purpose: To make the oil
& refrigerant mix together.
They are in separated
condition when
air conditioner
is stopped.
Mixed refrigerant &
oil will be collected
into outdoor unit.
Only very small
amount of oil remain
inside piping, which
is acceptable.
1
Operate air
conditioner at
cooling mode for
10 ~ 15 minutes.
2
After 10 ~ 15 minutes of pre
operation, close 2 way valve.
After 3 minutes, close 3 way
valve.
3
Take out air
conditioner unit.
4
Install New
Refrigerant air
conditioner.