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2. Detailed Settings Function
(3) Refer to Table 2-5, 2-6, 2-7 and Fig. 2-8 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 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.
(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.
CAUTION
l Be sure to check that the external static pressure is
within the range for use and then make the setting.
Failure to observe this may result in insufficient airflow
or water leakages. Refer to Fig. 2-8 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 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.
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 temperature is over 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.
5
2.
Open the lid of electrical equipment box and check where
the short-circuit pin on the indoor unit control PC board is
located (Fig. 2-7)
3.
Short circuit the applicable short-circuit pin in accordance
with the selected short-circuit pin connected (Table 2-4).
150 Pa : TP3 (2P: yellow) short-circuit
140 Pa : TP1 (2P: red) short-circuit
* Use the short-circuit connector (2P: yellow) supplied.
Table 2-4 Selection of connected short-circuit pins
External static pressure at the time of
rated airflow volume
Unusable
150 Pa
140 Pa
TP6
TP3
TP1
Indoor Unit control PC board
5 - 28
VRF SYSTEMS Indoor Unit
Short-circuit pin
TP6 (2P: white)
TP3 (2P: yellow)
TP1 (2P: red)
White Yellow
Red
TP6
TP3
TP1
Fig. 2-7
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