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Switching power circuit
Fig. 1-1
·
An AC power supply from outdoor unit passes through the 3.15 A fuse, varistor (VA001), and noise filter circuit and rectified
and smoothed by DB1 and C003 to become a DC current 325 V. It is then supplied to indoor fan motor drive circuit,and
switching power circuit.
·
The switching power circuit, as controlled by IC001, drives the primary winding of the transformer (T001) to produce a
specified voltage at the output winding. [The output terminal (pin ) of IC001 has a switching voltage. But it changes in
voltage peak and oscillation period depending on the power load. usually,the oscillation frequency when the air condition
operation is about 67 kHz. In the standby state, the oscillation frequency is lowered to a level as low as 20 kHz or so to
reduce the standby power.]
①
·
The outputs of the output windings of the transformer is rectified and smoothed to become DC voltages at primary 18.5 V,
12 V, and 8.5 V respectively. The primary 18.5 V is supplied to the drive circuit of the indoor fan motor, the 12 V is supplied
to each vane motor and to the drive circuits of the cleaning unit driving motor and other equipment, and the 8.5 V is adjusted
to a stable 5 V by the 3-terminal regulator IC (IC101,IC103) and supplied to the microcomputer peripheral circuit.
If a failure in a part or circuit has produced an abnormal current in the power supply, the 3.15 A fuse will melt down to
prevent further damage. If the 3.15 A fuse melts down, check the indoor fan motor, switching electrical circuit, and other
components and replace any defective part.
If an abnormally high voltage is applied to the power supply, the 3.15 A fuse and varistor (VA001) will prevent further
damage. If a high voltage results in the 3.15A fuse melted down, the varistor (VA001) should have deteriorated and
destroyed. Therefore replace it at the same time.
The primary circuit of the transformer (T001) has a voltage to ground. Guard against electric shocks.
Check
Check
Caution
1. Control power circuit
DESCRIPTION OF MAIN CIRCUIT OPERATION
RAK-18PPB /25PPB /35PPB /50PPB
73
Содержание RAC-18WPB
Страница 50: ...WIRING DIAGRAM RA RAC 18 25 35WPB K 18 25 35 50PPB RAC 5 WPB 0 50 ...
Страница 52: ...CIRCUIT DIAGRAM MODEL RAK 18 25 35 50PPB 52 WIRED REMOTE CONTROL SEND POWER FOR CLEANNESS ...
Страница 53: ...MODEL RA C 18 25 35 WPB 53 ...
Страница 54: ...MODEL RAC 50WPB 54 ...
Страница 67: ...MODEL RAK 18 25PPB RAC 18 25WPB INDOOR UNIT INDOOR UNIT 67 ...
Страница 68: ...COOLING CYCLE INDOOR UNIT OUTDOOR UNIT HEATING CYCLE INDOOR UNIT OUTDOOR UNIT MODEL RAK 35PPB RAC 35WPB 68 ...
Страница 78: ...10 10 10 10 10 R901 R904 R641 R907 R908 R694 R902 R695 R741 R740 R642 DSW1 DSW1 R903 R905 R906 78 ...
Страница 81: ...L N 300 330 Main parts L N C021 C022 37 5 420V RAC 18 25 35WPB 81 1 5 ...
Страница 85: ...5 5 1 10 11 12 74 74 70 70 74 75 5 1 HIC P W B 74 70 75 85 ...
Страница 86: ...6 Electric expansion valve circuit 48 47 46 45 13 14 15 16 4 3 2 1 68 67 66 65 RED 14 12 10 7 6 1 8 6 1 6 2 86 ...
Страница 87: ...2A Fuse DC300 330V 7 7 1 87 ...
Страница 88: ...2A DC300 330V 88 ...
Страница 89: ...L N 300 330 L N 50WPB 89 ...
Страница 90: ...300 330 C021 C023 500 450V 16V R249 33 ACT IP CUT 30 90 ...
Страница 94: ...5 5 1 74 74 70 70 74 75 5 1 HIC P W B 40 41 42 74 70 75 94 ...
Страница 96: ...2A Fuse DC300 330V 7 1 7 96 ...
Страница 97: ...2A DC300 330V 97 ...
Страница 108: ...108 109 ...
Страница 110: ...SELF DIAGNOSIS LIGHTING MODE MODEL RAC 18 25 35WP B 110 ...
Страница 111: ...SELF DIAGNOSIS LIGHTING MODE MODEL RAC 50WP B 111 ...
Страница 131: ...57 131 ...
Страница 132: ...Please set the DIP switch No 6 to ON accordingly Refe to page r 78 132 ...
Страница 133: ...78 133 ...
Страница 134: ...134 ...
Страница 148: ...HITACHI RAK 18PPB RAC 18WPB RAK 25PPB RAC 25WPB HHAW NO 0080E RAK 35PPB RAC 35WPB RAK 50PPB RAC 50WPB 3 148 ...