Movincool CM 12 Service Manual
  1. Manuals
  2. Brands
  3. Movincool Manuals
  4. Air Conditioner
  5. CM 12
  6. Service manual

Movincool CM 12 Service Manual

Unit serial number range: 0211xxxxc12 to present
Hide thumbs Also See for CM 12:
Table of Contents

Advertisement

Quick Links

SERVICE MANUAL
CM 12
Unit Serial Number Range: 0211XXXXC12 to Present
DocID: 00G00088EA

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the CM 12 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Movincool CM 12

Summary of Contents for Movincool CM 12

  • Page 1 SERVICE MANUAL CM 12 Unit Serial Number Range: 0211XXXXC12 to Present DocID: 00G00088EA...
  • Page 2 All rights reserved. This book may not be reproduced or copied, in whole or in part, without the written permission of the publisher. DENSO SALES CALIFORNIA, INC. reserves the right to make changes without prior notice. MovinCool ® , Office Pro ® and SpotCool ® are registered trademarks of DENSO Corporation.

  • Page 3: Table Of Contents

    Table of Contents Table of Contents Operation Section 1. PRECAUTIONS FOR SAFETY Foreword............... 6 Definition of Terms .
  • Page 4 Table of Contents 6. CONNECTION AND SETTING Power Supply Requirements ............30 Millivolt Wall Thermostat Connection .
  • Page 5 Table of Contents Repair Section 7. TROUBLESHOOTING Troubleshooting ..............34 Alarm .

  • Page 6: Precautions For Safety

    Operation Section 1. PRECAUTIONS FOR SAFETY 1.1 Foreword • This manual has been published to service the MovinCool CM 12. Please use this service manual only when servicing the CM 12. 1.2 Definition of Terms Describes precautions that should be observed in order to prevent injury to WARNING the user during installation or unit operation.

  • Page 7: Construction

    Operation Section 2. CONSTRUCTION 2.1 Exterior Dimensions Ground Screw (M6) With Washer Fixing Hole (M4) For Optional Outlet Ring (8.5) Mount Bracket (t 0.08) (2.0) (2.3) (6.3) (1.3) (0.6) (0.7) (9.2) (DIA. 10.0) (3.5) 15.7 4 x DIA. 0.6 (8.1) (2.8) (19.9) (15.8)

  • Page 8: Exterior Overview

    Operation Section 2.2 Exterior Overview Cold Air Exhaust (10 in.Dia.Flange) Condenser (Hot) Air Exhaust Evaporator (Room) Air Inlet (10 in.Dia.Flange) Drain Pipe for Pump Mounting Brackets Condensate Pan Drain for Maintenance Thermistor Service panel Override (Stop) Switch Signal Input and Output Wires Thermostat Wires Condenser Air Inlet...

  • Page 9: Internal Structure

    Operation Section 2.3 Internal Structure Evaporator Capillary Tube Compressor Condenser Evaporator Fan Evaporator Fan Motor Drain Pump Control Box Accumulator Condenser Fan Condenser Fan Motor ILL00533-00...

  • Page 10: Basic Construction

    Operation Section 2.4 Basic Construction • The MovinCool CM 12 is compact in Condenser Control Box construction due to the condenser and Evaporator evaporator being enclosed in one unit. The interior of the unit is divided into two sections. One section contains the evaporator which cools room interior air.

  • Page 11: Technical Specifications

    Operation Section 3. SPECIFICATIONS 3.1 Technical Specifications ITEM SPECIFICATIONS Electronic Features Control Millivolt Thermostat (Field supplied) Electrical Characteristics Voltage Requirement Single-Phase, 115 V, 60 Hz Operating Voltage Max. 127 V Range Min. 104 V Starting Current 50 A Recommended Fuse Size 15 A 11.2 A 14.9 A...
  • Page 12 Operation Section ITEM SPECIFICATIONS Condenser Type of Condenser Plate Fin Type of Fan Centrifugal Fan Air Flow High 700 CFM (1190 m 370 CFM (630 m Max. External Static Pressure 0.12 IWG (30 Pa) Motor Output High 0.09 kW 0.06 kW Refrigerant Refrigerant Control Capillary Tube...
  • Page 13 Operation Section • Specifications are subject to change without notice. < NOTE > *1 : With two 6-foot (1.8 m) ducts containing one 90° bend each, supply grill and return grill with filter [0.16 IWG (40 Pa) external static pressure] on high fan speed. *2 : When ambient temperature is lower than 65°F (18°C), operation may be interrupted due to anti-freeze protection activation.

  • Page 14: Characteristics

    Operation Section 3.2 Characteristics Cooling Capability Curve Cool Air Temperature Difference Curve 15 (27.0) Condenser Inlet Air Temperature at 95F 14 (25.2) 13 (23.4) 12 (21.6) 11 (19.8) 10 (18.0) 9 (16.2) 35 (95) 8 (14.4) 30 (86) 7(12.6) 25 (77) Relative Humidity (%) 20 (68) (50)

  • Page 15: Refrigeration System Construction

    Operation Section 4. REFRIGERATION SYSTEM 4.1 Refrigeration System Construction The component parts of the refrigeration system include the following: • Compressor, Evaporator, Condenser, Accumulator, Capillary tube, High pressure switch These parts are all connected by copper tubing. All the connections have been brazed. Connecting Pipe Compressor Evaporator Inlet Pipe...

  • Page 16: Compressor

    Operation Section 4.2 Compressor • The compressor used for the unit is hermetically sealed. The compressor and the compressor motor are in one casing. (1) Compressor construction • The construction of a rotary type compressor is divided into two mechanisms; the drive mechanism (compressor motor), and the compression mechanism (compressor).
  • Page 17 Operation Section (3) Operation 1) Start of compression 1) The cylinder is filled with low pressure gas. Discharge Blade 2) Since pressure in the discharge chamber is higher Valve than in the cylinder, the discharge valve is kept closed. Roller I001676 2) Suction and compression 1) The pressure in the cylinder increases gradually.

  • Page 18: Condenser

    Operation Section (4) Compressor lubrication • The lubrication system is comprised of a hollow shaft, an oil scraper mounted at the end face, hollow shaft, a shaft journal (shaft Rotor bearing), and the lubrication groove for the shaft journal. The lubrication groove is wider than the oil hole.

  • Page 19: Capillary Tube

    Operation Section 4.4 Capillary Tube • The capillary tube is a long thin tube utilizing High Temp./High Pressure line flow resistance to serve as an expansion Liquid Refrigerant valve. The length and the inner diameter of the capillary tube are determined by the capacity of the refrigeration system, specified operating conditions, and the amount of refrigerant.

  • Page 20: High-Pressure Switch

    Operation Section 4.7 High-Pressure Switch • The high-pressure switch prevents Pressure of Refrigerant condenser compressor from being Snap Disk damaged by excessive high pressure in the Movable Point high-pressure line of the refrigeration cycle. Stationary Point The switch is normally closed. The snap disk responds to the variations in pressure and, if Terminal Case...

  • Page 21: Electrical System

    Operation Section 5. ELECTRICAL SYSTEM 5.1 Circuit Diagram ODFM IDFM GROUND(G) CN24 CN23 Fire Alarm CN21 CN22 CN25 INPUT BROWN EXTERNAL AC115 V 52CT BROWN 52OD2 52OD1 1PHASE OUTPUT 52ID 60Hz 115V CN17 YELLOW ORANGE 52CM CN13 CN12 CN11 CN03 CN16 CN15 CN01...

  • Page 22: Control Box

    Operation Section 5.2 Control Box CC: Capacitor for Compressor RB: Relay Board 4-Position Dipswitch RX: Auxiliary Relay "OFF" Position TB2: Terminal Block2 TB1: Terminal Block1 CF1: Capacitor for Evaporator Fan Motor CF2: Capacitor for Condenser Fan Motor ILL00537-00...

  • Page 23: Operation

    Operation Section 5.3 Operation (1) Basic operation • When a Y signal is input, the 52CM relay located on the relay board comes ON, and the compressor operates. • When a G signal is input, both the 52ID relay and the RX (auxiliary relay) come ON, and the evaporator and condenser fans operate.

  • Page 24: Relay Board

    (6) Automatic restart after power interruption (Automatic Recovery Function) • The program within the CM 12 microprocessor contains a feature that will automatically restart the unit after power is lost and then regained. The unit also has memory in order to return itself back to the operating mode (either manual or preset program) it was in prior to the loss of power.
  • Page 25 Operation Section (2) Dip switch setting • The controller is equipped with a four position dip switch that defaults in the OFF position. The dip switch can be set to configure the following functions: Switch Setting Name Function DSW4 Alarm Setting When DSW 4 is ON, the buzzer sound function is disabled.

  • Page 26: Compressor

    Operation Section 5.5 Compressor (1) Compressor motor • The compressor motor is a single-phase motor and is contained within the same housing as the compressor. Specifications: - Rated Voltage: 115 V - Rated Output: 890 W I002753 (2) Compressor overload relay •...

  • Page 27: Fan Motor

    Operation Section 5.6 Fan Motor (1) Evaporator Fan Motor • The evaporator fan motor is a single phase, induction type two-speed motor. Specifications: - Rated Voltage: 115 V, 60 Hz - Rated Output: High - 44.5 W, Low - 14.3 W - Rotational Speed: High - 1100 rpm, Low - 760 I000520 <...

  • Page 28: Capacitor

    Operation Section 5.7 Capacitor • The capacitor is used to improve the rotational power of the fan motors and compressor at startup. The specification for each capacitor is shown below. Rated Capacitor Capacitance Voltage Evaporator Fan Motor 250 V 7 µF Condenser Fan Motor 220 V 9 µF...

  • Page 29: Float Switch

    Operation Section 5.10 Float Switch • A float switch is installed in the drain pan. The float switch is a normally closed type switch. If evaporator condensation cannot be evacuated and the drain pan becomes full, the float rises, turning the switch on, which then activates the warning signal output and stops the unit's operation.

  • Page 30: Connection And Setting

    6. CONNECTION AND SETTING 6.1 Power Supply Requirements • The CM 12 requires a single-phase 115 V, 60 Hz power supply. • The power supply should be a dedicated single outlet circuit with a UL recognized short-circuit and ground fault protective breaker, and a maximum fuse size of 20 A.

  • Page 31: Millivolt Wall Thermostat Connection

    Wire Type: Thermostat cable / Solid wire 16 ~ 26 AWG 4) Identify the thermostat connectors labeled G, G1, Y, and RC. G (Fan On/Off), G1 (Fan Speed Hi/Lo), Y (Cooling On/Off) and RC (Cooling Transfer - Common) Connecting Thermostat to CM 12 Unit CM 12 WIRES Wall Thermostat...

  • Page 32: Warning Signal Connection

    System: Cool / Heater (Selects Cool only.) 6.3 Warning Signal Connection • The CM 12's controller is equipped with a warning signal output relay type (Form-C, normally open dry contact), which can be used to monitor the failure condition. Relay contactor is closed if the following condition has occurred:...

  • Page 33: Fire Alarm Control Panel Connection

    Operation Section 6.4 Fire Alarm Control Panel Connection • The CM 12's controller is equipped with a normally open input signal, which can be connected directly from the fire alarm control panel. When receiving the signal from the fire alarm control panel, the unit turns off and does not turn back on until power source is reset or turns the wall thermostat off and on.

  • Page 34: Troubleshooting

    Repair Section 7. TROUBLESHOOTING 7.1 Troubleshooting • Before troubleshooting the system, the following inspection should be performed. WARNING Disconnect power supply from the unit before performing any service. Beware that some residual voltages may remain in the unit immediately after the power is disconnected. (1) Inspection of power source voltage •...

  • Page 35: Alarm

    • The CM 12 controller is equipped with a warning signal output-type relay (Form-C, normally open dry contact), which can be used for monitoring the CM 12 abnormality conditions. The relay contactor is closed when the following conditions have occurred:...
  • Page 36 Repair Section Alarm Cause Detection Details Pattern Temperature sensor failure When an abnormality is detected in either RTS, CTS, or ODS. (Thermistor short / failure) Detection value: Below 136.5 k ohm (93.2 °F (34 °C)) or above 566 k ohm (181.4 °F (83 °C)).

  • Page 37: Troubleshooting Chart

    Repair Section 7.3 Troubleshooting Chart • To accurately troubleshooting the problem, it is important to carefully confirm the nature of the problem. Common problems are: - Insufficient cooling. - Unit does not operate. - Overflow of drain water. - Abnormal noise or vibrations. - Others.
  • Page 38 Repair Section Alarm Condition Check Area Possible Cause Remedy Pattern Unit does Drain hose Drain hose clogged Remove any blockage or excessive not operate. (for internal drain pump). kinks preventing water flow. RESET Drain hose trap position is too Improve hose installation. high to pump up condensation (Refer to the operation manual of this water (for internal drain pump).
  • Page 39 Repair Section (2) Insufficient cooling Condition Check Area Possible Cause Remedy Unit Air is not cool. Compressor start delay (120 seconds) Compressor starts after 120 seconds operates. is activated. automatically. Freeze protection is activated. Clean the filter on the evaporator inlet Condition: Compressor stops while the air grill.

  • Page 40: Basic Inspection

    Repair Section 7.4 Basic Inspection • Perform the following inspections before disassembly. (1) Power supply voltage inspection • Check the power supply voltage. - Single phase 115 V (60 Hz) • Check the operation and condition of the fuse or circuit breaker for the power source. (2) Inspection of plate fins •...

  • Page 41: Inspection Of Capacitor (For Fan Motor And Compressor)

    Repair Section 7.5 Inspection of Capacitor (For Fan Motor and Compressor) (1) Ohm-meter method • Set the ohm-meter to the 10M range. Place the CC: Capacitor for Compressor two probes against the two terminals of the capacitor. At first, the ohm-meter should indicate small value, then the reading should gradually increase...

  • Page 42: Inspection Of Compressor

    Repair Section 7.6 Inspection of Compressor (1) Compressor motor • Measure resistance across the terminals of the compressor motor. • Between terminals (at 77 °F (25 °C)) - R-C Approx. 0.49 - 0.8 ohm - C-S Approx. 1.9 - 3.3 ohm •...

  • Page 43: Inspection Of Fan Motor

    Repair Section 7.7 Inspection of Fan Motor (1) Evaporator fan motor • Measure resistance across the terminals of the fan motor. • Between terminals (at 77 °F (25 °C)) - Black-White Approx. 24.5 ohm - Black-Blue Approx. 36.5 ohm - Black-Red Approx. 39.0 ohm •...

  • Page 44: Inspection Of Wiring Connection

    Repair Section 7.9 Inspection of Wiring Connection • Refer to the wiring diagrams on page 21 and check the connection of each wire. CAUTION Secure the wires using clamps to prevent contact with the edges of the structure, etc. Secure the wires in the same position as prior to removal.

  • Page 45: Parts Construction

    Repair Section 8. DISASSEMBLY 8.1 Parts Construction Right Side Panel Top Panel Capillary Tube Condenser Freeze High Pressure Inlet Air Protection Switch (HPRS) Thermistor Condenser Thermistor (ODS) (CTS) Evaporator Inlet Air Thermistor (RTS) Frame Evaporator Fan Condenser Fan Accumulator Drain Pan Compressor Floot Switch...

  • Page 46: Disassembly

    Repair Section 8.2 Disassembly 1) Take out the four (4) screws, and then remove the service panel. Screws (4) Service Panel I002761 2) Disconnect the two power supply lines from the terminal, and disconnect the ground line. CAUTION • Ground tightening torque: - 0.74 ±...
  • Page 47 Repair Section 4) Take out the sixteen (16) screws, and then Front Panel Screws(3) remove the front panel. Screws(9) Screws(4) I002764 5) After disconnected from the relay connector (white, two-pin), either the drain pump assembly or only the drain pump itself can be removed. Connector Hose Clip I002766...

  • Page 48: Removal Of Evaporator Fan Assembly

    Repair Section 8.3 Removal of Evaporator Fan Assembly Ring Frame Motor I002773 1) Disconnect the three connectors (two white, two- Screws (2) pin connectors; one white, three-pin connector), and then take out the two (2) screws and the two (2) nuts. Connectors Nuts (2) I002767...
  • Page 49 Repair Section 3) Take out the three (3) screws, and then remove the ring. Loosen the set screw with an Allen wrench and remove the fan. Set Screw CAUTION Straight Surface When assembling the ring, ensure that the straight surface of the ring is facing forward. Screws (3) Ring I002774...

  • Page 50: Removal Of Condenser Fan Assembly

    Repair Section 8.4 Removal of Condenser Fan Assembly Frame Frame Motor Ring ILL00593-00 1) Take off the four (4) nuts. Nuts (4) I002778 2) Disconnect the motor connector (white, six-pin) from circuit board CN22, and remove the Condenser Fan Assembly condenser fan assembly.
  • Page 51 Repair Section 3) Take out the four (4) screws, and then remove the ring. Loosen the set screw with an Allen wrench and remove the fan. Set Screw CAUTION When assembling the ring, ensure that the straight surface of the ring is facing forward. Screws (4) Ring ILL00543-00...

  • Page 52: Removal Of Electrical Parts

    Repair Section 8.5 Removal of Electrical Parts WARNING • Disconnect the power supply from the CM 12 unit before performing any service. Beware that some residual voltages may remain in the unit immediately after the power is disconnected. Capacitor for...
  • Page 53 Repair Section (1) Relay Board To Terminal Block1 CN01 (Power Source) Support Support To Terminal Block2 Relay Board Fuse (Fire Alarm Input) (250 V, 5 A) To Float Switch CN15 To Terminal Block2 Not Use (External Output) CN16 CN14 Support CN24 Support To Auxiliary Relay...
  • Page 54 Repair Section Replacement of Relay Board 1) Replace the new relay on existing supports (Make sure all stand-offs are aligned horizontally). Change the support if damaged during removal process. Make sure that the dip switches on the new relay board are all set to off positions. 2) Reconnect all 11 connectors to the new relay board and make sure connector label 52CM3 is connected to terminal #3 and connector label 52CM4 is connected to terminal #4 of the relay.

  • Page 55: Refrigeration System Repair

    Repair Section 9. REFRIGERATION SYSTEM REPAIR 9.1 Repair of Refrigeration System • In case there is a leak, obstruction, or problem in the refrigeration system, replace or repair the part in question. After replacing any component, all connections must be brazed. (1) Proper brazing techniques •...
  • Page 56 Repair Section (4) Use of dry nitrogen gas • During brazing, the inside of the pipe undergoes an oxidative reaction due to the brazing flame. Introduce dry nitrogen gas (0.27 gal/min (1 L/min); adjust with the flow regulator) through the pinch-off tube of the refrigerant.

  • Page 57: Removal Of Refrigeration System Components

    Repair Section 9.2 Removal of Refrigeration System Components WARNING • Before replacing any refrigeration component, recover the refrigerant using standard recovery procedures and equipment. • When recovering the refrigerant, use the pinch-off tube as shown in figure below. CAUTION • To prevent oxidation, dry nitrogen should be conducted (flow rate 0.27 gal/min (1 L/min)) through the pinch-off tube during any brazing operation.
  • Page 58 Repair Section (1) Removal of compressor assembly 1) Disconnect CC1 (black) and CC2 (white) wires CC1 wire from the capacitor for compressor in the control CC2 wire box. Control Disconnect TBR wire (white) from the terminal CC: Capacitor block 1 in the control box. Compressor WARNING TBR wire...
  • Page 59 Repair Section 4) Remove three (3) nuts and three (3) washers, Compressor Nut (3) and keep them for installation, then remove the Washer (3) compressor. Remove three (3) cushions and three (3) collars Cushion (3) and discard. Collar (3) ILL00623-00...

  • Page 60: Charging The System With R-410A Refrigerant

    Repair Section 9.3 Charging the System with R-410A Refrigerant • Always ensure that the refrigeration system has been properly evacuated before charging with the specified amount of R-410A. • Equipments is for R-410A only. • Liquid charge (no gas charge). •...
  • Page 61 Repair Section (1) Connection of gauge manifold 1) Properly remove the crushed end of the pinch-off tube at the high pressure side of the refrigerant Charging Hose Side cycle with a pipe cutter. Refrigerant 2) Fit the process tube fitting to the pinch-off tube. Cycle Side Seal Pinch-Off Tube...
  • Page 62 Repair Section (3) Checking vacuum 1) Leave the high pressure valve and the low Valve Setting Leave valves closed for 5 pressure valve of the gauge manifold closed for minutes or more. Pointer of Closed Closed pressure gauge returning to five minutes or more, and confirm that the gauge zero indicates there is a leak.
  • Page 63 Repair Section (4) Checking gas leak 1) Remove the charging hose (green) from the Valve Setting vacuum pump, and connect the hose to the Closed Closed refrigerant cylinder (R-410A). Air Purging Open The Valve 2) Loosen the nut on the gauge manifold side of the of Refrigerant charging hose (green).
  • Page 64 Repair Section (5) Evacuation (repeat) 1) Close the valve of the refrigerant cylinder. Then Valve Setting remove the charging hose (green) from the Gauge Closed Open Closed Closed 30 inHg (100 kPa) or larger refrigerant cylinder, and connect it to the Low Pressure refrigerant recovery machine.

  • Page 65: Refrigerant Charging Work

    Repair Section 9.4 Refrigerant Charging Work (1) Refrigerant charging 1) Remove the charging hose (green) from the Valve Setting vacuum pump, and connect it to the refrigerant Closed Closed cylinder (R-410A). Air Purging Open The Valve 2) Loosen the nut on the gauge manifold side of the of Refrigerant charging hose (green).
  • Page 66 Repair Section (2) Removal of gauge manifold 1) Crimp the pinch-off tube with a pinch-off tool. Pinch-Off Tool 2) Remove the gauge manifold and the process To Gauge Manifold Side tube fitting. Crush the end of the pinch-off tube. Pinch-Off Tube 3) Braze the end of the pinch-off tube.

  • Page 67: Reassembly

    Repair Section 10. REASSEMBLY 10.1 Reassembly of Unit • Reassemble the unit in the reverse order of removal. Described below are the parts that require special care in reassembling the unit. Perform all wiring or rewiring as referenced in the wiring diagram.

  • Page 68: Evaporator Fan Assembly

    Repair Section 4) Braze pipe at point A and G, then braze at point Pipe < NOTE > Pipe is packaged in the supplied compressor assembly. 5) Re-install overload relay, wires, and plastic cover after brazing. ILL00626-00 6) Apply insulators to the accumulator and pipe 2. <...
  • Page 69 P/N: SV0068-01 Second Issue: August 2012...

Table of Contents