6. Test run

6-4. Items to Check Before the Test Run

(1)Turn the breaker ON at least 12 hours in advance in order to energize the crank case heater.

(2)Fully open the closed valves on the liquid tube and gas tube sides.

6-5. Test Run Using the Remote Controller

(1)Press and hold the remote controller button for 4 seconds or longer. Then press the button.

“TEST” appears in the LCD display during the test run.

Temperature control is not possible when test run mode is engaged.

(This mode places a large load on the devices. Use it only when performing the test run.)

(2)Use either Heating or Cooling mode to perform the test run.

Note: The outdoor unit will not operate for approximately 3 minutes after the power is turned ON or after it stops operating.

(3)If normal operation is not possible, a code appears on the remote controller LCD display.

Refer to the “Table of Self-Diagnostic Functions and Corrections” on the next page, and correct the problem.

(4)After the test run is completed, press the button again. Check that “TEST” disappears from the LCD display. (This remote controller includes a function that cancels test run mode after 60 minutes have elapsed, in order to prevent continuous test run operation.)

(5)For the test run of an inverter outdoor unit, operate the compressors for a minimum of 10 minutes.

* When performing a test run using a wired remote controller, operation is possible without attaching the cassette-type ceiling panel.

(“P09” will not be displayed.)

6-6. Precautions

CZ-RTC2

Request that the customer be present when the test run is performed. At this time, explain the operation manual and have the customer perform the actual steps.

Be sure to pass the manuals and warranty certificate to the customer.

Check that the AC 230 / 208 V power is not connected to the inter-unit control wiring connector terminal.

*If AC 230 / 208 V is accidentally applied, the indoor or outdoor unit control PCB fuse (0.5A for both indoor and outdoor units) will blow in order to protect the PCB. Correct the wiring connections, then disconnect the 2P connectors (indoor: blue, OC) (outdoor: blue, OC) that are connected to the PCB, and replace them with 2P connectors (indoor: brown, EMG) (outdoor: brown, EMG). (Refer to the figure below.) If operation is still not possible after changing the brown connectors, try cutting the varistor (VA002) (both indoor and outdoor).

(Be sure to turn the power OFF before performing this work.)

Indoorunit control PCB

6

IC8

 

Outdoorunit control PCB

VA002 (Varistor)

3 – 5 HP

Varistor (black)

VA002

CN44 EMG

 

 

Terminal plug (black)

 

 

CN40 OC

 

 

Fuse

 

 

0.5A

 

EMG (brown) connector

OC (blue) connector

Fuse 0.5A

Fig. 6-4

6-4

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Panasonic R410A service manual Items to Check Before the Test Run

R410A specifications

Panasonic R410A is a refrigerant that has gained significant popularity in the air conditioning and refrigeration industry due to its favorable environmental properties and performance characteristics. Specifically designed to replace the harmful R22 refrigerant, which is being phased out due to its ozone-depleting potential, R410A offers a more eco-friendly alternative without compromising on efficiency or power.

One of the main features of R410A is its high energy efficiency. It operates at a higher pressure than R22, resulting in better heat transfer capabilities. This increased efficiency translates to lower energy consumption, making units using R410A more cost-effective in the long run. Additionally, R410A is known for its ability to provide excellent cooling performance even in high-temperature environments, making it suitable for a variety of applications, from residential air conditioning systems to commercial refrigeration units.

In terms of composition, R410A is a blend of two hydrofluorocarbons (HFCs), namely R32 and R125. This combination not only minimizes ozone depletion potential (ODP) but also reduces global warming potential (GWP) compared to older refrigerants. Panasonic has emphasized the importance of innovative technologies in its products, and R410A aligns perfectly with the company's commitment to developing sustainable solutions.

Panasonic also integrates advanced technologies to optimize the performance of R410A systems. For example, variable speed compressors, known as inverter technology, enhance system efficiency by adjusting the compressor's speed according to the cooling demand. This ensures that energy is only consumed when needed, further reducing operational costs.

Furthermore, R410A has a wide range of applications, including air conditioning systems, heat pumps, and chillers. Its versatility makes it a popular choice among manufacturers and consumers alike. The refrigerant is also compatible with existing R22 equipment, although specific retrofit procedures must be followed to ensure peak performance and reliability.

In conclusion, Panasonic R410A stands out as an innovative refrigerant choice in the HVAC industry, offering a combination of energy efficiency, environmentally friendly properties, and advanced technologies. As regulatory frameworks continue to tighten on greenhouse gas emissions, R410A and similar refrigerants are expected to play a crucial role in shaping a more sustainable future for air conditioning and refrigeration. Its high performance and lower environmental impact solidify its position as a leading refrigerant in contemporary cooling solutions.