(d) Forced cooling /heating operation (Master unit)
(Note) Following explanation is based on using CnG1 terminal and setting function [P09]-[2] with 7-segment display.
However other terminals can be used with following function setting of 7-segment display.
CnS1: [P07]-[2] CnS2: [P08]-[2] CnG2:
[P10]-[2]
1) When SW3-7 on the outdoor control PCB is turned ON after setting function [P09]-[2] with 7-segment display, if
CnG1 is shorted, forced heating operation is performed, but if CnG1 is open, forced cooling operation is performed.
2) If the different mode from the forced operation mode is commanded from indoor unit, the "mode unmatch" message
is displayed on the LCD of remote control and the operation is entered in FAN mode.
3) With the forced mode from indoor unit, if a different operation mode is commanded, following operations take place
based on the forced cooling/heating operation set with the 7-segment [P38].
P38 = 0: The operation mode unmatch is displayed on the remote control, etc., and it is changed to the fan
operation.
P38 = 1: It is operated with the forced cooling/heating operation mode.
Setting temperature for cooling … 28
℃
Setting temperature for heating … 20
℃
SW3-7
ON CnG1
Open Operation in cooling only
Shorted Operation in heating only
OFF Normal operation
5)
Reset of unmatched condition (Cooling/heating unmatched)
When unmatch occurs among indoor units, it can be reset by either one of followings.
①
If the operation mode of outdoor unit is matched with that of indoor unit.
②
If the operation mode is changed to “Fan” or “Stop” on the indoor units on which Cooling/heating is unmatched.
(Total capacity of indoor units of which load is high)
(Note) Indoor load condition (%) =
Total capacity of indoor units with the thermostat ON
(11) VTCC : Variable Temperature and capacity control (VRF inverter Multi-system energy save control)
On the multi-system, target pressures are set uniformly so that indoor units operate with a constant capacity and repeat the
ON/OFF control with which thermostats are turned OFF when temperatures become near the setting temperature.
Owing to the tuning of target high/low pressure near the setting temperature, it becomes possible to perform the high efficiency
operation near the setting temperature.
For this reason, duration of time for highly efficient operation is increased by providing the compressor upper limit speed ac-
cording to the thermostat ON capacity.
・
Thermostat ON capacity … Total capacity of indoor units which are operating with the thermostat ON
①
(a) Correction of target high/low pressure
(i) Starting condition (either of
①
or
②
)
① When [P07] = 12 and CnS1 is shorted
② When [P07] ≠ 12 and [P39] = 1
(ii)
(iii)
Contents of control
① During the outdoor unit operation mode at cooling
・Indoor load more than 50% → Corrected to the target cooling low pressure lower.
・Indoor load less than 50% → Corrected to the target cooling low pressure higher.
② During the outdoor unit operation mode at heating
・Indoor load more than 50% → Corrected to the target heating high pressure higher.
・Indoor load less than 50% → Corrected to the target heating high pressure lower.
(1) 7-segment and operation data retention
(a) 7-segment display
Operation information is displayed for checking various operation data during test run and for helping malfunction
diagnosis at servicing. Input data to microcomputer, contents of outdoor unit control, indoor unit registration
information, or other, are mainly displayed on the 7-segment LED.
(i) Operation information display
①
Displays each item at 7-segment of 3-digit × 1 on the outdoor unit PCB.
②
Display is controlled with the following buttons.
SW9: Setting button for order of 10 of display code display
SW8: Setting button for order of 1 of display code display
SW7: Data erase/write button
③
.
(During setting buttons, Code No. is displayed)
If SW9 or SW8 is pressed during the data display, it returns to corresponding code display.
If SW9 or SW8 is pressed during the code display, code No. is changed according the button setting.
Example) If it is required to display the data of code [C23] instead of the data of code[C00] displayed,
(i) Press SW9 or SW8 and it turns from data display to code display of [C00]
(ii) Press 2-time of SW9 and 3-time of SW8 in the state of [C00] display, the code display
changes to [C23]
(iii) After 3 seconds passed, the data corresponding to [C23] is dispalyed.
④
Code [C96] is operable item. It is possible to delete the retained operation data (data of 30 minutes
preceding an anomalous stop) by following resetting procedure.
<Resetting operation>
• Select code [C96]. If any anomalous data is retained, the data display [dEL] is shown 3 seconds
later.
• Pressing SW7 for 3 seconds erases the memory data on RAM.
(EEPROM data are not erased.)
• As the data are erased, the data display shows [- - -].
When no anomalous data are retained, it displays [---] as well.
• Unless the reset operation is performed, data are retained. Therefore, if normal operation is resumed
without the reset operation and an anomalous stop occurs again, no new anomalous data cannot be
retained, but former anomalous data are still retained unchanged.
⑤
If you press SW8 (order of 1), the number changes 0
1
2 ... 9
0.
⑥
If you press SW9 (order of 10), the number jumps to the leading code of each order of 10.
Data display [CXX] and setting value display [PXX] are considered to be continuous.
Example: Pressing SW9 at [C07] it changes to [C10], and press SW9 again, it changes to [C20].
: Pressing SW9 at [C90], it changes to [P00], and press SW9 again, it changes to [P10].
⑦
Codes [C44] and [C45] are operable items. With the following reset operation, the cumulative
compressor operation time corresponding to the code No. can be erased (reset). (Reset of operation time
after replacing the compressor)
<Resetting operation>
• Select codes [C44] and [C45]. Cumulative compressor operation time to the present is displayed 3
seconds later.
• Pressing SW7 for 3 seconds erases the memory data.
However, the cumulative compressor operation time data in the 30 minutes log data preceding an
anomalous stop (if this retained log data are not deleted) are not erased by this procedure.
⑧
Data display for spare items is left in blank.
(C) Data output
-
197
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