Hitachi RAS-20CNHZ2 User Manual

NO. 0148E
SERVICE MANUAL
PM
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 7
HOW TO USE ---------------------------------------------------------------------- 10
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 35
MAIN PARTS COMPONENT -------------------------------------------------- 37
WIRING DIAGRAM ---------------------------------------------------------------- 39
CIRCUIT DIAGRAM--------------------------------------------------------------- 41
PRINTED WIRING BOARD LOCATION DIAGRAM --------------------- 43
BLOCK DIAGRAM ----------------------------------------------------------------- 49
BASIC MODE ----------------------------------------------------------------------- 51
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 64
DESCRIPTION OF MAIN CIRCUIT OPERATION (INDOOR) -------- 65
DESCRIPTION OF MAIN CIRCUIT OPERATION (OUTDOOR) ---- 71
TROUBLE SHOOTING----------------------------------------------------------- 95
PARTS LIST AND DIAGRAM------------------------------------------------- 110
RAS-20CNHZ2
RAS-30CNHZ2
REFER TO THE FOUNDATION MANUAL
INDOOR UNIT
RAS-20CNHZ2 RAS-30CNHZ2
OUTDOOR UNIT
RAM-50CNHZ2
DC INVERTER DUAL SYSTEM MULTI (WALL TYPE)
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
MAY 2002
H.A.P.M.
TYPE
MODEL
1ø, 220V – 230V, 50HzPOWER SOURCE
TOTAL INPUT
TOTAL AMPERES
COOLING CAPACITY
HEATING CAPACITY
DIMENSIONS
NET WEIGHT
(W)
(A)
(kW)
(B.T.U.)
W
H
D
(kg)
(mm)
745
248
175
5.5
850
650
298
43
RAS-20CNHZ2
RAM-50CNHZ2
RAS-30CNHZ2
RAM-50CNHZ2
798
265
168
6.5
REFER TO THE SPECIFICATIONS PAGE 8.

Hitachi RAS-20CNHZ2 Specifications

General

Cooling Capacity	2.0 kW
Heating Capacity	2.5 kW
Power Supply	220-240V, 50Hz
Refrigerant	R410A
Weight (Indoor Unit)	9 kg
Type	Split System

Summary

SERVICE MANUAL

SAFETY DURING REPAIR WORK

SAFETY PRECAUTION

SPECIFICATIONS

OPERATION MODES

AUTOMATIC OPERATION

Describes how the unit automatically selects the optimal operating mode.

COOLING OPERATION

Instructions and parameters for operating the unit in cooling mode.

HEATING OPERATION

Instructions and parameters for operating the unit in heating mode.

DEHUMIDIFYING OPERATION

Instructions and parameters for operating the unit in dehumidifying mode.

TECHNICAL DIAGRAMS

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MAIN PARTS COMPONENT

WIRING DIAGRAM

CIRCUIT DIAGRAM

BLOCK DIAGRAM

TROUBLE SHOOTING

CHECKING THE OUTDOOR UNIT ELECTRICAL PARTS

Diagnostic steps for electrical issues in the outdoor unit.

DISCHARGE PROCEDURE AND HOW TO CUT OFF POWER TO POWER CIRCUIT

Critical safety steps for handling high voltage components during service.

LIGHTING MODE SELF-DIAGNOSIS LAMP

Interpreting error codes indicated by the self-diagnosis lamp.

PARTS LIST AND DIAGRAM