– 27 –
NO.
3
Item
Room temperature
control
Overview of specifications
(2) The set temperature for HEAT operation can be corrected by
code No. 06.
Set data
Correction of set temp.
0
2
4
6
+0°C
+2°C
+4°C
+6°C
Factory setting
Set data
2
• When use of remote controller sensor is set (with DN32), no
correction is performed.
After 10 minutes pass from thermo sensor OFF, operation
mode changes from HEAT (thermo sensor OFF) to COOL if Ta
exceeds Tsh +1.5.
( ) shows an example of COOL ON/OFF.
After 10 minutes pass from thermo sensor OFF, operation
mode changes from COOL (thermo sensor OFF) to HEAT if Ta
lowers below Tsc -1.5.
(2) The GA control after determination of operation mode follows
the description in No. 4.
(3) The room temperature control and temperature correction
follow the descriptions in No. 3 and No. 15.
Capacity auto
control
(GA control)
COOL/HEAT/AUTO
control
4
5
(1) Issues instruction of operating frequency to outdoor unit
according to the difference between Ta and Ts.
(2) COOL operation
Calculates room temp. difference between Ta and Ts as well
as room temp. variation every 90 seconds to find correction
value of specified operating frequency and to correct the
current operating frequency.
Ta (n) – Ts (n) : Room temp. difference
n : Number of detection times
Ta (n –1) – Ta (n) : Room temp. variation
n – 1 : Number of detection times (90 seconds before)
(3) HEAT operation
Calculates room temp. difference between Ta and Ts as well
as room temp. variation every 60 seconds to find correction
value of specified operating frequency and to correct the
current operating frequency.
Ts (n) – Ts (n) : Room temp. difference
n : Number of detection times
Ta (n) – Ta (n_1) : Room temp. variation
n – 1: Number of detection times (60 seconds before)
(4) DRY operation
The frequency correction control is the same as that for COOL
operation.
However, the maximum frequency is limited to S6 or so.
Note)
When LOW fan speed is set, the maximum frequency is
limited to SB or so.
(1) Switching between COOL and HEAT is determined based on
the following control.
Remarks
Heat intake temperature shift
(When unit’s temperature
sensor is used)
Tsc : COOL set temp.
Tshc : HEAT set temp. +
room temp.
control/correction
–1.5
Tsc or Tsh
+1.5
HEAT
(COOL OFF)
(COOL ON)
COOL
Ta (˚C)
