Movincool Office Pro 12 / Office Pro 18 / Office Pro 24 Service Manual Page 18
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Operation Section
18
5.3 Condenser
• The condenser is a heat exchanger with copper tubes that are covered with thin aluminum
projections called plate fins.
• Heat is given off and absorbed by air being pulled across the condenser fins by the centrifugal
fan and then expelled through the exhaust air duct.
5.4 Capillary Tube
• The capillary tube is a long thin tube utilizing
line flow resistance to serve as an expansion
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. The
capillary tube causes the high pressure, high
temperature liquid refrigerant sent from the
condenser to expand rapidly as the refrigerant
is sprayed out through the fixed orifice in the capillary tube. As a result, the temperature and
state of the refrigerant becomes low and mist-like respectively, causing it to evaporate easily.
5.5 Evaporator
• The evaporator, like the condenser, is a heat exchanger covered with plate fins. Heat is removed
from the air being pulled across the evaporator by the centrifugal fan and the resulting cool air
is expelled through the cool air vent.
5.6 High Pressure Switch
• The high pressure switch prevents the
condenser and compressor from being
damaged by excessively high pressure in the
high pressure line of the refrigeration cycle.
The switch is normally closed. The snap disk
responds to the variations in pressure and, if
pressure is abnormally high, the snap disk
moves down to push the pin down, causing the
internal contacts to open. This interrupts the
ground signal at the control board (J104 connector) which turns the compressor off.
• Possible causes of this trouble include:
- The condenser air filter is dirty, restricting air flow.
- The condenser blower is defective.
I001887
High Temp./High Pressure
Liquid Refrigerant
Low Temp./Low Pressure
Gas and Liquid Mixture
I001768
Pressure of Refrigerant
Movable Point
Snap Disk
Pin
Terminal
Lead Wires
Stationary Point
Molding by Resin
Case
- SERVICE MANUAL 1
- Table of Contents 3
- 1. PRECAUTIONS FOR SAFETY 6
- 2. GENERAL DESCRIPTION 7
- 3. CONSTRUCTION 8
- 3.2 Exterior Components 9
- 3.3 Internal Structure 10
- 3.4 Basic Construction 10
- 3.5 Air Flow 11
- 3.6 Compressor and Fans 11
- 3.7 Condensate Pump 11
- 3.8 Drain Tanks (optional) 11
- 4. SPECIFICATIONS 12
- < NOTE > 13
- Operation Section 14
- 5. REFRIGERANT SYSTEM 16
- 5.2 Compressor 17
- High Temp./High Pressure 18
- Liquid Refrigerant 18
- Low Temp./Low Pressure 18
- Gas and Liquid Mixture 18
- 6. ELECTRICAL SYSTEM 19
- (1) Fan mode 20
- (2) Cool mode 21
- 6.3 Control Box 22
- (2) Relay board 23
- (3) Relay board fuse 23
- 6.4 Fan Motor 24
- 6.5 Compressor Motor 24
- 6.6 Condensate Pump 25
- 6.7 Drain Switch 27
- 6.9 Compressor Protection 28
- 6.10 Temperature Control 28
- 6.11 Fan Mode Control Switch 29
- 7. TROUBLESHOOTING 31
- 7.2 Self-Diagnostic Codes 32
- 7.3 Troubleshooting Chart 34
- (3) Overflow of drain water 38
- 7.4 Basic Inspection 39
- Thermometer 40
- Cool Air Out 40
- Evaporator Air In 40
- 8. DISASSEMBLY 41
- 8.2 Disassembly 42
- Repair Section 43
- Screws (9) 44
- Screws (12) 44
- (1) Control box 45
- (3) Control board 46
- Set Screw 50
- Nuts (6) 50
- Ties (3) 50
- (1) Ohmmeter method 53
- (2) Capacitance tester method 53
- 8.8 Inspection of Fan Motor 54
- 8.11 Inspection of Thermistor 55
- 8.12 Inspection 55
- 9. REFRIGERANT SYSTEM REPAIR 56
- (4) Use of dry nitrogen gas 57
- (5) Vertical Joint 57
- (2) Evacuation 60
- (3) Checking vacuum 61
- (4) Checking gas leak 62
- (5) Evacuation (repeat) 63
- 9.4 Refrigerant Charging Work 64
- (2) Removal of gauge manifold 65
- 10. REASSEMBLY 66
- 10.4 Wiring Notice 67
- 10.5 Perform the Inspection 67
- 10.6 Caster Maintenance 67
- 10.7 Schematic 68
- DENSO SALES CALIFORNIA, INC 69
- Long Beach, CA 90810 69
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