Hitachi RAC-18SX8 Service Manual page 85

Heating temperature setting
remote control setting
+ SHIFTW
or
+ SFTSZW
Dash period Dash period Dash per iod
２ ０'
fan speed
set to AUTO
Operation
START/STOP switch
Thermometer judgment
Maximum length 3'
Defrost signal
Preheating canceled
Preheat judgment
Super-HI
HI
MED
Indoor unit
Control by heat exchanger temperature
LOW
SILENT
Super-LOW
Room two-way valve Open
Operation lamp
６ ０"
Maximum
ＷＭＡ Ｘ ２
Preheating period
（ＷＭＡ Ｘ）
set to WMAX
（ＷＭＡ Ｘ ２ ）
Rating
（ＷＳ Ｔ Ｄ）
STARCPL
Minimum
WMIN
WMINHI
WMINSZ
０
Ｈ ｉ
Ｌ ｏ
Outdoor unit
１ "
Latch-type reversing valve
Notes: (1) The condition for entering hot dash is when the fan speed mode is set to AUTO or "HI" and the product is started, or when heating is in progress and
the fan speed mode is changed to AUTO or "HI" and the compressor's speed (P term) due to the temperature difference between the temperature setting
(including the correction shift only) and room temperature is WMAX or more, and when the room temperature is 18℃ or less and the external temperature is 10℃ or less.
(2) The condition for terminating the hot dash compressor's maximum speed period is: ① when the room temperature reaches the heating temperature setting (including
the heating shift) + 0.66℃ and ② when the thermometer is off.
(3) The thermometer-off temperature during hot dash is the heating temperature setting (including the heating shift) +3℃. After the thermometer is turned off,
the hot dash is terminated and fuzzy control is initiated.
(4) The minimum on-time for the compressor is 3 minutes, while the minimum off-time is 3 minutes.
(5) The time limit where the compressor's maximum speed (WMAX) or (WMAX2) can be maintained during a normal heating operation (other than hot dash) is within 120
minutes at a room temperature of 18℃ or more. There is no limit if the room temperature is 18℃ or less or the external temperature is 2℃ or less.
(6) During preheating, during defrost (including the balancing time after the end of defrost), and during auto-fresh defrost, the operation lamp will blink with cycles of "lit 2
seconds and off 1 second."
(7) Preheating judgment is as follows: when the product is started with the START/STOP switch, the heat exchanger temperature ＜ 24℃ and preheating is turned on.
When the heat exchanger temperature is ＞ 24℃, preheating is canceled.
(8) When the fan speed mode is set to "MED", the compressor speed is WJKMAX or less. During "LOW" operation, it is WBEMAX or less. During "quiet" operation,
it is limited to WSZMAX or less.
(9) When in super-LOW mode the room temperature is 18℃ or less, the indoor unit is stopped and the product starts again at super-LOW at 18℃ +0.33℃.
Provided that, during preheating, and after defrost, the super-LOW operation during preheating is stopped at a heat exchanger temperature of 16℃ or less.
(10) During hot dash (only when the room temperature - external temperature ＜ RTOSTA), during powerful operation, and when the external temperature -5℃ or less,
WMAX2 is used as the compressor's maximum speed.
Basic mode for heating
Stop Operation Stop Operation
Thermometer
off
Preheating canceled
Control by heat Control by heat
exchanger temperature exchanger temperature
１ ０"
Preheating period
set to WMAX
１ ５" １ ５" １ ５"
Ｌ ｏ Ｌ ｏ Ｌ ｏ
１ " １ "
Stop
Thermometer off
Thermometer
off
Control by heat
Control by heat exchanger temperature
exchanger temperature
３ '
１ ５" １ ５"
Ｌ ｏ
Note:
1. For the constants expressed in uppercase alphabet letters in the figure,
see the data in PWRITE-ZU.
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