Basic Heating Operation Chart - Hitachi RAF-25NH4 Service Manual

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Ætd
Heating set temperature
(remote control set temperature
(+) SHIFTW)
Dash period
10ûC
Fan speed set to ÒautoÒ
Start
Start / stop switch
Thermo judgment
Max. 3min.
Defrost signal
Preheating released
Preheating judgment
Ultra-Hi
30sec.
Hi
Indoor fan
Med
10sec.
Lo
Ultra-Lo
Hot keep lamp
Operation lamp
Max.
Rating
Wtd
1
Wtd
2
3000
Min.
0
Outdoor fan
Reversing valve (cooling ÒonÒ mode)
Notes:
(1) Hot dash is engaged if the difference between the room temperature and set temperature is equal to that between the room temperature, at which the compressor reaches maximum speed, and set temperature (ÆTWMAX: See Table 7), and
the room and outdoor temperatures are less than 10ûC; when the fan speed is ÒautoÒ, operation is started at ÒHiÒ, or the fan speed is changed to ÒHiÒ during heating.
(2) The maximum compressor speed period during hot dash is finished (1) when the room temperature reaches the heating set temperature (including heating shift) when the thermo is off.
(3) The thermo OFF temperature during hot dash is heating set temperature (including heating shift) plus 3ûC. After thermo OFF, hot dash finishes, and PI control starts with item I = 0.
(4) The compressor minimum ON time and minimum OFF time is 3 minutes.
(5) The time limit for which the maximum compressor speed during normal heating (except for hot dash) can be maintained is less than 120 minutes when the room temperature is 18ûC or more; it is not provided when the room temperature is
less than 18ûC and outdoor temperature is less than 2ûC.
(6) The operation indicator blinks every second during initial cycle operation, preheating, defrosting (including balance time after defrosting is finished), or auto fresh defrosting.
(7) If the room temperature falls to less than 18ûC in the Òultra-LoÒ mode, the indoor fan stops. When the room tempereture is 18ûC+0.33ûC or more, the ultra-Lo operation restarts. However, the ultra-Lo operation during preheating or preheating
after defrosting does not stop if the room temperature is less than 18ûC.
(8) When thermostat is OFF ; after 3 minutes has elapsed operation with FAN set to ON for 15seconds and OFF for 60seconds will be repeated depending on heat exchange temperature.
asic Heating Operation
Stop
Start
Thermo
OFF
30sec.
30sec.
30sec.
10sec.
10sec.
30sec.
15sec.
Control by
Control by heat exchanger
heat exchanger
10min.
10min.
Hi
15sec.
15sec.
Lo
Lo
18ûC
Stop
Start
Thermo OFF
30sec.
30sec.
30sec.
15sec.
Control by
heat exchanger
Control by heat exchanger
10sec.
15sec.
15sec.
Lo
Lo
Stop
Thermo
OFF
30sec.
30sec.
10sec.
15sec.
Control by
heat exchanger
3min.
15sec.
Lo
Table 6 Speed Specifications during
Steady Speed Period.
Ætd (Hot dash time)
Wtd
Wtd
1
2
-1
-1
Less than 10 minutes
2000min
1600min
10 - 20 minutes
3000min
-1
2400min
-1
20 minutes or more
4000min
-1
3200min
-1
Table 7 ÆTWMAX
Set temperature
Compressor speed
(including shift)-
- minimum speed
room temperature
1400min
-1
2.00ûC
1800min
-1
2.33ûC
-1
2200min
2.66ûC
-1
2600min
3.00ûC
3000min
-1
3.33ûC
3400min
-1
3.66ûC
-1
3800min
4.00ûC
-1
4200min
4.33ûC
4600min
-1
4.66ûC
5000min
-1
5.00ûC
-1
5400min
5.33ûC
-1
5800min
5.66ûC
6200min
-1
6.00ûC
6600min
-1
6.33ûC
-1
7000min
6.66ûC
Note:
1. See the data on page 118, 120, 123 for each constant
in capital letters in the diagrams.
137

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