(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.
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