Panasonic U-120ME2U9 Service Manual page 130

2. Detailed Settings Function
NOT E
(1) Check the following items before performing the setting-check operations or auto airflow volume operations.
1) Check to make sure that the electrical wiring and ducting have been completed. Activate the stand-by mode. In
particular, make sure that the closed damper located in the middle of the duct is open, if installed. Also, make
sure that air filters have been installed inside the air inlet duct.
Check to make sure air is not leaking from the joints.
2) If multiple air outlets and air inlets are included, adjust the airflow volume ratio of all of them until they meet the
design airflow ratio.
3) Make sure the address setting has been completed.
(2) The operation check will be completed in approximately three minutes if the settings have been made correctly. The
settings will be modified if they are out of the range of use (maximum 30 minutes). If this is not completed within 31
minutes, check whether the air speed is set to "H" or not.
(3) See Table 2 and Fig. 2 for details on the relationship between the value of item code "b0" and the external static
pressure.
(4) When set in group control (connecting multiple indoor units with one wired remote controller), set each indoor unit to
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item code "b0".
When amending the setting after selecting [ b. Manual setting] (due to airflow path changes, etc.), it is necessary
to cancel [b. Manual setting] (disconnect short-circuit connector). When [b. Manual setting] has not been cancelled,
[c. Manual setting] and [d. Auto airflow volume setting] will be activated if selected, but [b. Manual setting] takes
precedence when the power is switched back on after power outages, etc.
(5) If this is not completed within 8 minutes, check the drive mode, air speed and air inlet temperature.
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(6) When set in group control (connecting multiple indoor units with one wired remote controller), the test run operations
display will disappear once the external static pressure setting check or auto airflow volume control operation check
have been completed for the main unit. Decisions on sub-unit complete are not possible. The test run operation
display will disappear after one hour even if the external static pressure setting check or auto airflow volume control
operation check have not been completed.
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CAUTION
l Make sure the external static pressure is in a range of specifications.
Then proceed the external static pressure setting. Improper settings can
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cause noise, a shortage of airflow volume and water leakage. See Fig. 2 for
the external static pressure setting range.
l There are cases in which automatic variable dampers and other
mounted items may trigger the P12 alarm on systems that modify
the static pressure of outdoor units when the auto airflow volume
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control operations or setting check operations are carried out if high
static pressure in the outdoor unit is lowered. In this event, lower the
dampers, etc., so that the static pressure in the outdoor unit reaches
its lowest level, and then carry out the auto airflow volume
control operations or setting check operations.
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l Be sure to set the [External Static Pressure Setting] once
again after amending the airflow path for the duct or air outlet
after setting the external static pressure.
l Set the air inlet temperature within the range for use. The
auto airflow volume control will not function if the air inlet
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temperature is over 113°F(45°C) or not in the fan mode.
1-1. How to Set on PC Board
1. Turn off the power breaker to halt the supply of electricity to the
PC board.
2. Open the lid of electrical equipment box and check where the short-
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circuit pin on the indoor unit control PC board is located (Fig. 1)
3. Short circuit the applicable short-circuit pin in accordance with the selected short-circuit pin connected (Table 1).
0.60 in.WC (150 Pa) : TP3 (2P: yellow) short-circuit
0.56 in.WC (140 Pa) : TP1 (2P: red) short-circuit
* Use the short-circuit connector (2P: yellow) supplied.
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Table 1 Selection of connected short-circuit
External static pressure
4 - 18
2WAY VRF SYSTEM
Remote Controller Functions
pins
at the time of rated Short-circuit pin
airflow volume
Unusable TP6 (2P: white)
0.60 in.WC (150 Pa) TP3 (2P: yellow)
0.56 in.WC (140 Pa) TP1 (2P: red)
White Yellow Red
TP6 TP3
TP6 TP3 TP1
Indoor Unit control PC board
TP1
Fig. 1