Hitachi RAC-07CHV1, Service Manual

Page: 31 / 68

Control function
Operation mode
Fan Cooling Sensor dehumidification Heating Automatic
• At the time of heating
operation mode, the same
operation as for heating
is executed.
• Defrosting of each operation
mode is executed.
7
Preheating
operation
8
Defrosting
(including automatic
fresh defrosting).
Notes:
• Even when the preheating signal is not given as input, heating operation is started when
3 minutes have passed for T.
• Preheating operation is executed at the time of operation start and after completion
of defrosting, and at all other times, there is no operation, independent of the preheating signal.
TA
(Reverse cycle defrosting)
10 min.
min.
TB
(Silencing period)
30 sec
TC
(Cycle balancing time)
30 sec
TE
(Defrosting prohibition
time)
60 min.
min.
+0
-5
+0
-1
• For the time TE after start of heating operation, defrosting will not be
executed even when the defrosting signal is given as input.
• When the reserve cycle defrosting TA has continued for the time
shown in the table on the left, the operation advances to TB and TC
independent of the defrosting signal.
• When the power relay becomes ON after expiration of the time TE,
defrosting will be started immediately with input of the defrosting signal.
• Once defrosting has been completed, the defrosting signal is not
accepted for the time TE.
• When a defrosting signal has been given as input at the time of stop
by means of the start/stop switch or at the time of OFF timer count-up,
defrosting is executed before operation stop.
• The defrosting signal is not accepted at the time of overload input.
Sensor dehumidification
Cooling strong
Automatic
Heating
Fan
Sensor
dehumidification
Cooling
Heating
Cooling
Yes
Yes
Yes
Yes
Yes
Yes (automatic)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
No
Heating wireless
Item
Operation switching
Temporary switch
Service switch
Nice temperature reservation
Automatic fresh defrosting
Defrosting
Pd cut 1
Pd cut 2
Pd cut 3
Heating load reduction
External fan relay
Reversing valve relay
Reversing valve lock protection
Sleep circuit
Heater operation at the time of sensor
dehumidification
Automatic blowing direction
Filter sign
Wireless mode
Item
Cooling, Sensor 16 17.6
ON temperature dehumidification 24 25.6
Thermostat (Thermostat relay) 32 33.6
operation power relay Heating 16 19.6
(˚C) 24 27.6
32 35.6
Differential (˚C) 0.33
–
–
Low-temperature (T1) ON (˚C) 5.0
defrosting Reset (˚C) 9.0
Preheating (T2) Reset (˚C) 17.0
ON (˚C) 15.0
–
–
Pd cut 1 (T3) ON (˚C) 48.66
(T4) Reset (˚C) 45.66
Pd cut 2 (T6) ON (˚C) 55.0
(T7) Reset (˚C) 49.0
(T5) Fan Relay H
[
Original (˚C) 35.0
Pd cut 3 (T8) ON (˚C) 63.0
(T9) Reset (˚C) 55.0
Table 1 Specifications
Table 2 Sensor operation values
Other detailed specifications
1. When the room temperature rises
within 3 minutes after thermostat
OFF during cooling operation with
automatic velocity, the blowing
velocity changes in the order of S
[
L
[
H in the same way as at
the time of thermostat ON.
2. In case of Tele. control input during
stopped ON timer, operation will be
started at that time and the timer
will be cleared.
3. In case of Tele. control input during
operation of the OFF timer, the
operation will be stopped at that time
and the timer will be cleared.
4. Even when operation stop is
executed at the time of outside fan
OFF by overload, automatic fresh
defrosting will not be executed.
5. In case of switching to “Heating”
during “Automatic” heating
operation, the operation will be
continued as it is when the
thermostat is ON. 3 min delay will
not be entered. However, the set
room temperature and the blowing
velocity will be according to the
remote control signal. The same
applies for switching from “Heating”
to “Automatic” heating.
6. In case of switching from “Sensor
dehumidification” operation to
“Cooling”, as it is when the
thermostat is ON. 3 min delay will
not be entered. However, the set
room temperature and the blowing
velocity will be according to the
remote control signal.
The same applies for switching from
“Cooling” to “Sensor dehumidifica-
tion”. The same also applies for
“Automatic” sensor dehumidification,
cooling “Sensor dehumidification”,
“Cooling”.
7. The filter sign lights after operation
of the indoor fan for 100 hours. The
time is cleared by the filter switch.
8. After entry into trouble mode (when
the indication lamp is flashing), the
rapid feed mode can not be
changed.
9. When operation by nice temperature
reservation is executed during sleep
operation, normal operation will be
continued, and the advance time
becomes the temperature difference
between the set temperature without
sleep shift and the room
temperature.
10. The 60 minutes of defrosting
prohibition are counted from
Thermostat ON after start/stop
switch ON. When the thermostat is
OFF at the time of start/stop switch
ON, the 60 minutes will be counted
from the time of thermostat ON. The
initial OFF time is not counted.
Counting starts when the thermostat
becomes ON, and the count then
continues even if the thermostat
becomes OFF.
11. In case of switching from “Heating”
the reversing valve is held for 3
minutes.
12. The defrosting signal is not
accepted with overload input, and
the operation becomes as shown
below when the overload input
disappears.
(1) When previously the
defrosting signal existed
without overload input,
defrosting will start
immediately.
(2) In cases other than the
above, defrosting will be
executed with a defrosting
signal in the condition without
overload input.
– 33 –
Indoor heat exchanger
thermistor temperature
T
1
Fan relay H
Power relay
Stick relay
Outside fan relay
Operation lamp
Fan relay S
Power relay
Stick relay
Outside fan relay
Operation lamp
Min. 3 minutes
T
E
15 sec
15 minutes-T
E
30 sec 30 sec
Completion
Defrosting
start
30 sec
30 sec
2 sec
10 sec
Start/stop switch
Defrosting signal
Preheating signal
Fan relay H
Fan relay L
Fan relay S
Power relay
Stick relay
Outside fan relay Outside fan relay
Reversing valve relay
Heater relay
Operation lamp Operation lamp
Hot keep lamp
2 sec
10 sec
T
A
30 sec 60 sec
3 minutes 3 minutes
T
A
30 sec 60 sec
T
B
T
C
15 sec
Start/stop switch Start/stop switch
Thermostat signal Thermostat signal
Preheating signal Preheating signal
Fan relay H
Fan relay L
Fan relay S
Power relay Power relay
Hot keep lamp Hot keep lamp
2 sec
T
3 minutes
30 sec 30 sec 30 sec 30 sec
15sec 30 sec 30 sec
30 sec 30 sec
"Strong" circulation "Strong" circulation
2 sec
Low Power Dehumidification
(1) When the set temperature is lower than the room temperature.
Dry Button Dry Button
Set temperature Set temperature
Fan relay L Fan relay L
Power relay Power relay
Stick relay Stick relay
Operation lamp Operation lamp
L L L
+3
+2
+1
–1 –1
–2 –2
–3 –3
1deg up 1deg up
32
sec
0.2 sec
0.2 sec 0.2 sec
0.2
sec 0.2
sec
0.2
sec
32 sec
60 minutes 60 minutes
6 min 6 min
1 min
6 min
1 min 1 min
●
The min. ON time of the power relay is 3 minutes, and the min. OFF time is also 3 minutes.
● The indoor fan is not delayed in operation when the Dry button is pressed ON.
Notes:
● Forced operation by Dry button ON is executed even with thermostat OFF.
● The room temperature 30 sec after operation start minus 0.33 deg., becomes the set temperature.
●
When the room temperature is 16
°
C or lower, 16
°
C becomes the set temperature.
●
The other operation are the same as for (l).
●
The indoor fan is not delayed in operation when the Dry button is pressed ON.
L L L
Dry Button
Set temperature
Fan relay L
Power relay
Stick relay
Operation lamp
1 deg up
-1
-2
-3
-4
0.66deg
0.33deg
32 sec
60 minutes 60 minutes
32 sec
0.2 sec 0.2 sec 0.2
sec 0.2
sec 0.2 sec
(2) Set temperature higher than room temperature.