SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS February 2019 No. OCH669 REVISED EDITION-A TECHNICAL & SERVICE MANUAL Indoor unit [Model Name] [Service Ref.] Revision: • Some descriptions have been modified in REVISED EDITION-A. SLZ-KF09NA.TH SLZ-KF09NA OCH669 is void. SLZ-KF12NA SLZ-KF12NA.TH SLZ-KF15NA SLZ-KF15NA.TH SLZ-KF18NA SLZ-KF18NA.TH CONTENTS Model name indication INDOOR UNIT 1. REFERENCE MANUAL....................... 2 2. SAFETY PRECAUTION....................... 2 3.
1 REFERENCE MANUAL OUTDOOR UNIT’S SERVICE MANUAL Service Ref. Service Manual No. MXZ-2C20NA2-U1 OBH702/OBB702 2 SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use new refrigerant pipes. In case of using the existing pipes for R22, be careful with the following: · Change flare nut to the one provided with this product.
[1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the system with specified amount of refrigerant. [2] Additional refrigerant charge When charging directly from cylinder · Check that cylinder for R410A available on the market is a syphon type. · Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged in liquid phase.
3 PARTS NAMES AND FUNCTIONS 3-1. INDOOR UNIT Filter Removes dust and pollutants from drawn in air. Horizontal Air Outlet Sets horizontal airflow automatically during cooling or dehumidifying. Grille Auto Air Swing Vane Disperses airflow up and down and adjusts the angle of airflow direction. Air Intake Draws in air from room.
3-2.
3-3. Wired remote controller (Option) PAR-33MAA The functions which can be used are restricted according to each model. The main display can be displayed in 2 different modes: "Full" and "Basic." The initial setting is "Full." Display 9 12 1 11 21 4 Fan speed 16 Appears while the outdoor units are operated in the silent mode. 17 Appears when the built-in thermistor on the remote controller is activated to monitor the room temperature (a).
Menu structure Main menu Press the MENU button. Move the cursor to the desired item with the F1 and F2 buttons, and press the SELECT button. Vane · Louver · Vent. (Lossnay) High power Timer ON/OFF timer Auto-OFF timer Weekly timer OU silent mode Restriction Temp.
Main menu list Setting and display items Setting details Vane · Louver · Vent. (Lossnay) Use to set the vane angle. • Select a desired vane setting from 5 different settings. Use to turn ON/OFF the louver. • Select a desired setting from "ON" and "OFF." Use to set the amount of ventilation. • Select a desired setting from "OFF," "Low," and "High." High power** Use to reach the comfortable room temperature quickly. • Units can be operated in the High-power mode for up to 30 minutes.
Setting and display items Service Test run Input maintenance Function setting LOSSNAY setting (CITY MULTI only) Check Setting details Select "Test run" from the Service menu to bring up the Test run menu. • Test run • Drain pump test run Select "Input maintenance Info." from the Service menu to bring up the Maintenance information screen. The following settings can be made from the Maintenance Information screen. • Model name input • Serial No.
NOISE CRITERION CURVES SLZ-KF09NA.TH <60Hz> NOTCH SPL(dB) High 31 Medium 28 Low 25 LINE 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 10 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 NC-20 125 250 500 1000 2000 4000 70 8000 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 10 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 125 NOTCH SPL(dB) High 39 Medium 34 Low 27 LINE 250 500 1000 2000 4000 8000 <60Hz> SLZ-KF18NA.
5 OUTLINES AND DIMENSIONS SLZ-KF09NA.TH SLZ-KF12NA.TH SLZ-KF15NA.TH SLZ-KF18NA.
WIRELESS REMOTE CONTROLLER PAR-SL100A-E WIRED REMOTE CONTROLLER Unit: inch (mm) PAR-33MAA 2-5/8 (66) 3/4 (19) 7-7/16 (188) 4-3/4 (120) 4-3/4 (120) 3-5/16 (83.5) 1-13/16 (46) 7/8 (22) 2-9/16 (64.
6 WIRING DIAGRAM SLZ-KF09NA.TH SLZ-KF12NA.TH SLZ-KF15NA.TH SLZ-KF18NA.TH TB4 S3 *1. S2 TO OUTDOOR UNIT 20 1 19 CNV (WH) 1 123456 SW1 ON OFF ON OFF 12345 SW2 J42 J41 3 3 2 CN41 (WH) 4 1 CN90 (WH) CN44 (WH) 9 CN20 (RD) 1 4 1 2 CN4F (WH) 1 CN105 (RD) 4 1 CN4Z (WH) 5 BK 1 CN01 (BK) ~ - 1 1 CN2L (RD) LED3 1 1 3 ~ CN51 (WH) 5 LED2 + LED1 OFF ON 1 CN5Y (WH) 5 F1 SWE 5 CN22 (BU) 1 CN3C (BU) CN32 (WH) OG 2 YE OG See fig.1 I.
7 REFRIGERANT SYSTEM DIAGRAM SLZ-KF09NA.TH SLZ-KF12NA.TH SLZ-KF15NA.TH SLZ-KF18NA.TH Strainer #50 Heat exchanger Refrigerant GAS pipe connection (Flare) Condenser/evaporator temperature thermistor (TH5) Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection (Flare) Pipe temperature thermistor/liquid (TH2) Room temperature thermistor (TH1) Distributor with strainer #50 Strainer #50 Unit: inch(mm) SLZ-KF09/12NA.TH SLZ-KF15/18NA.TH Gas pipe φ3/8(9.
8 TROUBLESHOOTING 8-1. TROUBLESHOOTING Present and past check codes are logged, and they can be displayed on the wired remote controller or controller board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summarized in the table below. Check the contents below before investigating details.
Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds OPERATION INDICATOR lamp blinking pattern Beep Beep Beep Beep Beep Beep 1st 2nd 3rd nth 1st Off On On On Off On Approx. 2.5 s 0.5 s 0.5 s 0.5 s Approx. 2.5 s 0.5 s Self-check starts (Start signal Number of blinks/beeps in pattern indicates the check received) code in the following table (i.e., n=5 for “P5”) On 0.5 s Beep 2nd · · · Repeated On 0.
• If the unit cannot be operated properly after the test run, refer to the following table to find out the cause. PLEASE WAIT Symptom Wired remote controller For about 3 minutes after power-on PLEASE WAIT → check code Subsequent to about 3 minutes after power-on No messages appear even when operation switch is turned ON (operation lamp does not light up). Cause •For about 3 minutes after power-on, operation of the remote controller is not possible due to system startup.
8-3. SELF-DIAGNOSIS ACTION TABLE Check code P1 Note: E rrors to be detected in outdoor unit, such as codes starting with F, U or E (excluding E0 to E7), are not covered in this document. Please refer to the outdoor unit's service manual for the details. Abnormal point and detection method Cause Room temperature thermistor (TH1) 1The unit is in 3-minute resume prevention 1 Defective thermistor mode if short/open of characteristics thermistor is detected.
*1: only P-series outdoor unit Check code P5 Abnormal point and detection method Drain pump lock protection operation 1 Suspected abnormality, if drain pump stops for 5 seconds continuously with drain pump on. Drain pump will be restarted after turning off for 10 seconds. 2 Drain pump is abnormal if the condition above is detected 4 times during operation. Countermeasure Cause 12 Check if drain pump works. 1 Malfunction of drain pump 2 Clogged drain pump Check if connector (CNP) is connected.
*1: only P-series outdoor unit Check code P9 Abnormal point and detection method Countermeasure Cause Pipe temperature thermistor/Condenser / Evaporator (TH5) 1 Defective thermistor 1– Check resistance value of thermistor. 1 The unit is in 3-minute resume proteccharacteristics For characteristics, refer to (P1) above. tion mode if short/open of thermistor is 2 Check contact failure of connector (CN44) on detected. Abnormal if the unit does not the indoor controller board.
Check code E3 or E5 (6832 or 6833) E6 E7 FB(Fb) E1 or E2 (6201 or 6202) Abnormal point and detection method Countermeasure Cause Remote controller transmission error(E3)/ signal receiving error(E5) 1 2 remote controllers are set as 1 Set a remote controller to main, and the other 1 Abnormal if remote controller could not “main.” to sub. find blank of transmission path for 6 (In case of 2 remote controllers) seconds and could not transmit.
Check code PA Countermeasure Abnormal point and detection method Cause Forced compressor stop (due to water leakage abnormality) 1 The unit has a water leakage abnormality 1 Drain pump trouble 1 Check the drain pump. when the following conditions, a) and b), 2 Drain defective 2 Check whether water can be drained. are satisfied while the above-mentioned · Drain pump clogging detection is performed.
8-4. TROUBLESHOOTING OF PROBLEMS Note: Refer to the manual of outdoor unit for the detail of remote controller. *1: only P-series outdoor unit Phenomena Cause (1) LED2 on indoor controller board • When LED1 on indoor controller board is also off. 1 Power supply of rated voltage is not supplied to outis off. door unit. 2 Defective outdoor controller circuit board Power supply of 220–240 V AC is not supplied to indoor unit.
8-5. TEST POINT DIAGRAM 8-5-1. Indoor controller board SLZ-KF09NA.TH CN22 SLZ-KF12NA.TH Connect to the terminal block (TB5) (Remote controller transmission line) 10.4–14.6 V DC CN5Y SLZ-KF15NA.TH i-see Sensor motor (MT) 12 V pulse output CNV SLZ-KF18NA.TH Vane motor (MV) 12 V pulse output SW1 CN90 Model selection Connect to the wireless remote controller board (CNB) J41, J42 Jumper wire (Pair No.
8-6. FUNCTION OF DIP SWITCH Each function is controlled by the DIP switch on the indoor controller board. Model setting and capacity setting are preset in the nonvolatile memory of the indoor controller board. The black square (■) indicates a switch position.
8-7. TROUBLESHOOTING OF MAIN PARTS SLZ-KF09NA.TH SLZ-KF12NA.TH Parts name SLZ-KF15NA.TH Check method and criterion Room temperature thermistor (TH1) Pipe temperature thermistor/liquid (TH2) Condenser/evaporator temperature thermistor (TH5) Vane motor (MV) Measure the resistance with a tester. (Parts temperature 50 to 86°F) Normal 4.3 to 9.6 k" (Refer to "8-7-1. Thermistor Characteristic Graph") Measure the resistance between the terminals with a tester.
8-7-1. Thermistor Characteristic Graph Room temperature thermistor(TH1) Pipe temperature thermistor/liquid(TH2) Condenser/evaporator temperature thermistor(TH5) 40 Resistance (k") Thermistor for lower temperature < Thermistor for lower temperature > 50 Thermistor R0=15 k" ± 3% Fixed number of B=3480 ± 2% 1 T(˚F)Rt=15exp { 3480( 273+ T-32 1.8 30˚F 15.8 k" 50˚F 9.6 k" 70˚F 6.0 k" 80˚F 4.8 k" 90˚F 3.9 k" 100˚F 3.
9 SPECIAL FUNCTION BACK-UP HEATING FUNCTION 9-1. Operation The back-up heater turns ON when both of the following conditions have been satisfied: A) When the room temperature has not risen after the heater ON delay time has passed. Note: The heater ON delay time starts when the condition of “set temperature − room temperature > 1°F [0.5:]” has been satisfied. B) Set temperature − room temperature ] 3°F [1.
9-4. How to send the Request code PAR-3xMAA ("x" represents 0 or later) Main Main menu Maintenance Initial setting Service Main display: Cursor F1 F2 3/3 1 Press the button. 2 Select "Service" with the [Cursor] buttons ( F1 and F2 ) or the [Page] buttons ( F3 and F4 ), and press the button. Page F3 F4 Service menu Enter maintenance password 9999 3 Enter the current maintenance password (4 numerical digits). • Move cursor to the digit you want to change with the F1 or F2 button.
10 4-WAY AIRFLOW SYSTEM 10-1. FRESH AIR INTAKE (LOCATION FOR INSTALLATION) At the time of installation, use the duct holes (cut out) located at the positions shown in following diagram, as and when required. Fresh air intake Detail drawing of fresh air intake (Unit: inch) 5-17/32 Cutout hole 120° 12 +7/32 1-15/32 0 7-11/32 0° 5/16 [3-1 8-7/32 Burring hole Ceiling surface Refrigerant pipe Electrical Box Drain pipe 10-2.
10-4. FIXING HORIZONTAL VANE Horizontal vane of each air outlet can be fixed according to the environment where it is installed. Setting procedure 1) Turn off the main power supply (Turn off the breaker). 2) Remove the vane motor connector in the direction of the arrow shown below with pressing the unlocking button as in the figure below. Insulate the disconnected connector with the plastic tape.
11 DISASSEMBLY PROCEDURE SLZ-KF09NA.TH SLZ-KF12NA.TH SLZ-KF15NA.TH SLZ-KF18NA.TH Be careful when removing heavy parts. OPERATING PROCEDURE 1. Removing the air intake grille and air filter (1) Slide the knob of air intake grille to the direction of the arrow 1 to open the air intake grille. (2) Remove the grille hook from the panel to prevent the grille from dropping. (3) Slide the hinge of the intake grille to the direction of the arrow 2 and remove the air filter.
OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the electrical parts (1) Loosen the 2 screws on the control box cover. (2) Slide the control box cover as indicated by the arrow to remove. • Indoor controller board (I.B) • Terminal block (TB4) • Terminal block (TB5) Photo 4 Control box cover Screws Photo 5 Indoor controller board (I.B) Terminal block (TB4) Terminal block (TB5) Photo 6 4.
OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the pipe temperature thermistor/liquid (TH2) and pipe temperature thermistor/gas (TH5) (1) Remove the panel. (Refer to procedure 2) (2) Remove the room temperature thermistor (TH1). (Refer to procedure 4) (3) Remove the drain pan. (Refer to procedure 5) Photo 8 Pipe temperature thermistor/gas (TH5) Pipe temperature thermistor/liquid (TH2) and pipe temperature thermistor/gas (TH5) (See Photo 8) (4) Remove the control box cover.
OPERATING PROCEDURE PHOTOS/FIGURES 8. Removing the drain pump (DP) and float switch (FS) (1) Remove the panel. (Refer to procedure 2) (2) Remove the room temperature thermistor (TH1). (Refer to procedure 4) (3) Remove the control box cover. (Refer to procedure 3) (4) Remove the drain pan.
HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Feb. 2019 No. OCH669 REVISED EDITION-A Published: Sep. 2018 No. OCH669 Made in Japan Specifications are subject to change without notice.
