Sharp R-426H Service Manual Page 108
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- Table of contents
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2. Processes and functions
1
12
3
4
5
II - 4
2-2 Cold Draft Prevention (Heating Cycle)
The cold draft prevention function controls indoor fan speed so a strong draft of cold air
will not blow out before the indoor heat exchange coils have warmed up.
❑ STANDBY shows on the remote controller when the indoor fan speed is LL
(very low) or OFF. This condition occurs in the following 3 cases:
• During Thermo OFF (refer to 2-1 B). Room Temperature Control, Heating)
• During the defrosting operation (refer to 2-10 Defrosting Control, Heating)
• Until either the coil temperature E2 reaches 27°C or when a maximum of 6
minutes has past.
❑ The indoor fan motor operates in L instead of LL for 3 seconds as it starts to
give the fan an initial boost.
Chart Summary and Explanations
❑ The main idea of this chart is to show that the indoor fan speed increases and gets closer to
the set fan speed as the coil temperature E2 rises.
❑ The indoor unit’s coil temperature is taken from sensor E2 located in the middle of the indoor
heat exchange coil.
❑ The dotted line shows that the indoor fan motor is OFF. When the temperature at sensor E2
falls below 10°C, the indoor fan motor stops running.
Fig. 3
33
31
27
25
10
SET
FAN
SPEED
AUTO OR H
M
L LL LL/OFF LL L L L
LL LL/OFF LL L M M
LL LL/OFF LL L M H
MAX. 6 MINUTES
“STANDBY”
INDICATOR
INDOOR UNIT
COIL TEMP.
E2 (°C)
LL= Very low speed
L= Low speed
M= Medium speed
H= High speed
“STANDBY” APPEARS
0673_X_S
- TECHNICAL DATA 1
- SERVICE MANUAL 1
- Important 2
- WHO SHOULD USE THIS MANUAL 3
- TABLE OF CONTENTS 3
- Read Me First! 5
- 1-1 Unit Specifications 10
- 1-1Unit Specifications 30
- (B) Outdoor Unit 40
- Ceiling Mounted Type 47
- Concealed Duct Type 48
- Outdoor Unit 49
- 1-4 Dimensional Data 53
- 1-5 Refrigerant Flow Diagram 61
- 1-6 Operating Range 64
- 1-7 Cooling Capacity 65
- ● Heating Capacity 77
- 1-8 Noise Criterion Curves 78
- External Static Pressure 82
- Limit line 82
- 1-10 Air throw Distance Chart 83
- Tubing Length 85
- 0426_C_I 88
- 3 - ø40 hole 89
- 6 - ø6 hole 89
- 3 - ø60 hole 89
- 8 - ø6 hole 89
- Electrical Wiring 90
- 0511_M_I 91
- ■ Electrical Characteristics 93
- 1. Specifications 100
- Electrical Characteristics 100
- SM830080 105
- 2-1 Room Temperature Control 106
- SET SPEED 107
- 0673_X_S 108
- Chart Explanations and notes 109
- 2-4 Outdoor Fan Speed Control 110
- 2. Processes and functions 112
- 1566_M_S 114
- Fig. 14 116
- Fig. 13 116
- 0443_M_S 117
- (B) AUTO Control Mode 118
- (A) Cooling 119
- 0447_M_S 120
- 2-16 Dehumidifying Operation 121
- Auto-flap Control 122
- Ceiling-Mounted Type) 122
- 0451_M_S 123
- • Electric Wiring Diagram 126
- • Schematic Diagram 127
- This section explains: 139
- 0500_M_I 140
- 0499_M_I 141
- 0458_M_I 142
- 4. Service procedures 143
- (B) Heating 143
- 0654_C_I 146
- 1903_M_I 150
- 0340_M_I 151
- 0460_M_I 156
- 0652_M_S 157
- 0354_M_I 159
- Alarm message 160
- TEST RUN / CHECK button 160
- ON / OFF operation 160
- 0356_M_I 161
- Set CODE No. A1 with 165
- 0362_M_I 166
- (SET TEMP) button 168
- 0368_M_I 169
- 0639_X_S 173
- 0640_X_S 174
- 0641_X_S 174
- Multimeter 175
- 0643_X_S 176
- Indoor P.C.B. Ass’y 178
- Outdoor P.C.B. Ass’y 178
- 1251_X_I 179
- 1250_X_I 179
- • ACR 436 H - ACR 448 H 180
- Indoor Unit 180
- • ACR 425 H 180
- • ADR 425 H 181
- • ADR 436 H 181
- • ADR 448 H 181
- • AER 436 SHL3E 182
- Outdoor Units 182
- • AER 448 SHL3E 183
- Temperature (°C) 184
- 1577_C_I 188
- 1579_M_I 189
- 5. Appendix 190
- 5-1 P.C.B 191
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