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See also:
Instruction Manual
SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
COOLING
CAPACITY
TOTAL INPUT
TOTAL AMPERES
HEATING
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
JUN 2008
RAF-25QH8
RAF-35QH8
RAF-50QH8
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
Refrigeration & Air-Conditioning Division
PM
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------------------- 5
How To Use ------------------------------------------------------------------------ 6
Construction And Dimensional Diagram --------------------- 27
Main Parts Component --------------------------------------------------- 28
Wiring Diagram ---------------------------------------------------------------- 29
Wiring Diagram Of The Printed Wiring Board ------------ 31
Block Diagram ----------------------------------------------------------------- 35
Basic Mode ----------------------------------------------------------------------- 37
Refrigerating Cycle Diagram --------------------------------------- 51
DISASSEMBLY & ASSEMBLY PROCEDURE ---------------------------- 52
Description Of Main Circuit Operation ----------------------- 57
SERVICE CALL Q & A ---------------------------------------------------------- 63
TROUBLE SHOOTING ----------------------------------------------------------- 68
Parts List And Diagram -------------------------------------------------- 75
DC INVERTER
INDOOR UNIT
RAF-25QH8/RAF-35QH8/RAF-50QH8
1ø, 220 – 230V, 50 Hz
REFER TO THE SPECIFICATION
(OUTDOOR)
INDOOR UNIT
NO. 0423E
RAF-25QH8
RAF-35QH8
RAF-50QH8
CONTENTS
750
590
215
15
After installation
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Summary of Contents for Hitachi RAF-25QH8
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Page 1: Service Manual
NO. 0423E RAF-25QH8 RAF-35QH8 SERVICE MANUAL RAF-50QH8 REFER TO THE FOUNDATION MANUAL TECHNICAL INFORMATION FOR SERVICE PERSONNEL ONLY CONTENTS SPECIFICATIONS ------------------------------------------------------------------- 5 HOW TO USE ------------------------------------------------------------------------ 6 INDOOR UNIT CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 27 MAIN PARTS COMPONENT --------------------------------------------------- 28... - Page 2 – 1 –...
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- Page 6 RAF-25QH8/RAF-35QH8/RAF-50QH8 – 5 –...
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- Page 9 RAF-25QH8 RAF-35QH8 RAF-50QH8 (INDOOR UNIT) – 8 –...
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- Page 28 MODEL RAF-25QH8 RAF-35QH8 RAF-50QH8 – 27 –...
- Page 29 RAF-25QH8/RAF-35QH8/RAF-50QH8 RAF-25QH8/RAF-35QH8/RAF-50QH8 – 28 –...
- Page 30 RAF-25QH8/RAF-35QH8/RAF-50QH8 – 29 –...
- Page 31 – 31 –...
- Page 32 MODEL RAF-25QH8/RAF-35QH8/RAF-50QH8 – 33 –...
- Page 33 MODEL RAF-25QH8/RAF-35QH8/RAF-50QH8 – 35 –...
- Page 34 MODEL RAF-25QH8/RAF-35QH8/RAF-50QH8 Combination of operations: When operation mode is selected: One unit Other unit During automatic operation: Cooling • You cannot operate the indoor units in the following combinations. • When heating operation is automatically selected for the first indoor unit, the next...
- Page 35 Table 1 Fan speed by mode MODEL RAF-25QH8 RAF-35QH8 RAF-50QH8 Operation mode Fan speed mode Label name PROM LABEL REQUIRED VALUE REQUIRED VALUE REQUIRED VALUE FWSS_M Ultra Lo NAME OF UNIT SIDE OF UNIT SIDE OF UNIT SIDE Silent, Sleep FWSOY_M –1...
- Page 36 Fan tap is controlled from outdoor unit. Compressor speed is determined by instruction sent from indoor unit and corrected by outdoor unit according to such factors as capacity, fan speed, number of units being operated, outdoor temperature, etc. If another indoor unit is doing heating operation, cooling operation cannot be done. –...
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- Page 39 Hot Dash is started when the operation is started at fan speed “AUTO” of “HI” or when the fan speed is changed to “AUTO” or “HI” during heating operation, and when the compressor speed (P item) reaches (WMAX1 or WMAX2) or higher with the room temperature at 18°C or less and outdoor temperature at 10°C or less.
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- Page 41 MODEL RAF-25QH8/RAF-35QH8/RAF-50QH8 (3S/4S) (3S/4S) – 51 –...
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- Page 47 MODEL RAF-25QH8/RAF-35QH8/RAF-50QH8 – 57 –...
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- Page 53 MODEL RAF-25QH8/RAF-35QH8/RAF-50QH8 – 63 –...
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- Page 55 When only the power switch is turned To ensere correct opening and closing of the deflector on, the deflector and the upper louver and the upper louver will move when power is turned at the bottom air outlet moves even if on or the unit is to be operated in order to check its the START/STOP button is not fully opened and closed positions.
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- Page 58 MODEL RAF-25QH8/RAF-35QH8/RAF-50QH8 – 68 –...
- Page 59 MODEL RAF-25QH8/RAF-35QH8/RAF-50QH8 Reset stop Others Communications Error – 69 –...
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- Page 65 MODEL RAF-25QH8/RAF-35QH8/RAF-50QH8 – 75 –...
- Page 66 MODEL RAF-25QH8/RAF-35QH8/RAF-50QH8 RAF-35QH8 2.5 kW, 3.5 kW RAF-50QH8 5.0 kW UNION (3) RAS-N22V ATE-0972B RAF-25QH8 RAF-35QH8 RAF-50QH8 – 76 –...
- Page 67 MODEL RAF-25QH8/RAF-35QH8/RAF-50QH8 RAF-25QH8 RAF-35QH8 RAF-50QH8 – 77 –...
- Page 68 HITACHI RAF-25QH8 PM NO. 0423E RAF-35QH8 Printed in Malaysia RAF-50QH8...