Hitachi RAS-18SX8 Manuel De Maintenance page 93

Temperature setting in
comfortable cooling
(remote control temperature
setting + SHIDD)
fan speed set to AUTO
START/STOP switch
Operation lamp
Temperature judgment
Operation status
Heating dry
Room temperature category
Category 1(Stop) Category 2
HI
MED
Indoor unit
LOW
SILENT
Outdoor unit
１ ０ "
Latch-type reversing valve
１ '
Room two-way valve Open
９ ０ "
Ｓ Ｔ Ａ Ｒ Ｃ Ｐ Ｌ
ＷＡＭ Ｄ Ｒ Ｙ １ ・ ２ ・ ３
DMIN
Notes:
(1) The product determines the room temperature category and external temperature category as shown in Tables 1, 2, and 3 according to the room temperature and
external temperature, and performs control as shown in Tables 4 and 5.
(2) For the outdoor unit, its operation pattern is controlled as shown in Table 6 according to the room temperature category and external temperature category.
(3) If the operation status shown in Table 5 makes a state transition depending on the changes in room temperature or external temperature, the product will perform cycle
balancing with a compressor stop time as shown in Table 7.
(4) When the temperature judgment is low humidity in room temperature category 2, the product will be stopped. (The compressor stop time at that time is 3 minutes
or more.)
(5) The room temperature setting in comfortable cooling must be the external temperature less 5 ℃. Provided that, if the temperature is higher than the room temperature,
the temperature setting must be set to room temperature, with 24 ℃ as the lower limit. The fan speed is set to MED.
(6) The humidity setting in dry cool must be 50% when the room temperature setting is 27 ℃ or more, 55% when it is 26 ℃ or more, and 60% when it is
25 ℃ or more.
(7) If the product is stopped in "heating dry" or "cooling dry," the outdoor unit will run for 30 seconds with the outdoor unit pattern J.
(8) During a comfortable cooling operation with the "comfortable cooling" button of the remote control unit, pressing the "as-desired" button will light up the
"Sensitive to heat" or "Sensitive to cold" indicator, thereby activating a "Sensitive to heat" or "Sensitive to cold" operation. At that time, the temperature setting will
change as shown in Table 9.
Downloaded from www.Manualslib.com
Dry cool
Room temperature
High humidity
Cooling dry
Weak cooling Heating dry
Category 4 Category 2
Category 3
３ '
３ ０ "
１ １ ０ "
ＣOLMAX-COLMIN
STPSPTM1 ・ 2 ・ 3
９ ０ "
１ '
ＷＡＭ Ｄ Ｒ Ｙ １ ・ ２ ・ ３
Ｃ Ｏ Ｌ Ｄ Ｒ Ｙ
ＣＯ Ｌ Ｄ Ｒ Ｙ
manuals search engine
Table 1 Room temperature category
(at the time of operation startup)
Room temperature
(relative value from the
temperature setting)
＋0.66℃
−RYSTOP1 ℃
Low High humidity
humidity
Heating dry
Table 4 Control by room temperature category
Room
temperature
category
Category 4
３ ０ " ３ ０ "
Category 3
３ ０" １ ０" Category 2
Category 1
９ ０"
Table 5 Outdoor unit control (initial values) according to the room
ＷＡＭ Ｄ Ｒ Ｙ １ ・ ２ ・ ３
temperature and external temperature
External temperature
Room
temperature category
3' minimum
Operation status
Category 4
Outdoor unit
control pattern
Operation status
Category 3
Outdoor unit
control pattern
Operation status
Category 2
Outdoor unit
control pattern
Operation status
Category 1
Outdoor unit
control pattern
The outdoor unit patterns I and J are used for correction.
Table 2 Room temperature category
(during operation)
Room
Room temperature category
temperature
Room temperature
category When the room When the room
(relative value from the
When the room temperature declines temperature declines
temperature setting) temperature rises (when shifted from (when shifted from
category 3) category 4)
Category 4
Category 4
＋a℃
Category 3
＋b℃
Temperature setting
Category 2 Category 2
−1.0℃
Category 1
−RYSTOP 1℃
(stop)
Category 1
(stop)
Table 6 Control pattern for the outdoor unit
Room two- Latch-type
Pattern Control sequence
Compressor speed
way valve four-way valve
４ '
COLMAX
Fully
Cooling
open position
COLMIN A
COLDRY Fully closed Cooling position SS1
ＷＡＭ Ｄ Ｒ Ｙ ３ ４ '
Fully Cooling
ＷＡＭ Ｄ Ｒ Ｙ ２
closed position
B
ＷＡＭ Ｄ Ｒ Ｙ １
SS3
Stop
C
Lo
D
SS1
E
category Category 1 Category 2 Category 3 Category 4 SS2
Weak Weak Weak Weak
cooling cooling cooling cooling
F
SS3
C C C C
Cooling Cooling Cooling Cooling
dry dry dry dry
G
SS4
B B G H
Cooling
Heating dry Heating dry Heating dry
dry
H
SS5
A F H
A
Stop Stop Stop Stop
I
− − − SS6
−
J
SS7
(T1=GFSTM1,T2=GFSTM2)
Note:
1. For the constants expressed in uppercase alphabet letters in the figure, see the data in PWRITE-ZU.
– 119 –
Table 3 External temperature category
External temperature category
External
temperature
When the external When the external
temperature rises temperature declines
Category 4
29℃
27℃
Category 3
20℃
18℃
Category 2
10℃
8℃
Category 1
Table 7 Stop times in a state transition of the
operation status
Compressor
State transition
stop time
Weak cooling ⇒ heating dry
None
Ｔ １
Heating dry ⇔ cooling dry None
Cooling dry ⇒ weak cooling
3 minutes
Ｔ ２
Heating dry ⇒ weak cooling
3 minutes
Table 8 Relative values from the temperature setting
External temperature External temperature
State
transition
＜32 ℃ ≧32 ℃
ａ
Ｒ Ｙ Ｃ Ｌ Ｃ Ｈ Ｋ １ Ｒ Ｙ Ｃ Ｌ Ｃ Ｈ Ｋ ２
ｂ
Ｒ Ｙ Ｃ Ｄ Ｃ Ｈ Ｋ １
Ｒ Ｙ Ｃ Ｄ Ｃ Ｈ Ｋ ２
Table 9 Temperature settings for "Sensitive to heat"
and "Sensitive to cold" operations
"Sensitive to heat" operation Temperature setting− １ ℃
"Sensitive to cold" operation Temperature setting＋ １ ℃