Service Manual Moffat ELECTRONIC POLAR WITH EXTERIOR DISPLAY PUB # 06-MAN/RE-01 MTR12YATWW December, 2006 1
CONTENTS SECURITY DISPLAY FEATURES TEMPERATURE SELECTION QUICK COOLING VACATION LOCK CONTROL SPECIFICATION FOR FAN BLADE POSITION IN POLAR 12´ AND 14´ REFRIGERANT UNIT FORCED AIR, AND NATURAL CONVECTION IN CONDENSER UNIT COMPRESSOR FANS ODOR FILTER STARTING ELEMENTS (P.T.
SECURITY GENERAL INFORMATION The new line of no frost refrigerators identified as MOFFAT 2001 in the capacities of 11, 13, 14, 16 cubic feet, are manufactured in the refrigerator plant of ”ASTRAL” located in the city of Querétaro, Mexico. The standard no frost refrigerators use electromechanical controls, the deluxe models use electronic systems to control temperatures and defrost cycles, some models have the “QUICK FREEZE” options (quick cooling) and a” VACATION” mode feature.
FEATURES ALARM It is activated or disabled by pressing the ALARM pad. You will then hear a tone and the screen will display the letter “A” and the superior part of the button will be illuminated. VACATION To activate press the “VACATION” pad.
1- FAN BLADE ADJUSTMENT ON MOTOR ASSEMBLY “POLAR” A CILINDRICAL GAUGE IS NEEDED FOR THE POSITIONING OF FAN BLADE. SEE SPECIFICATION BELOW: For models the 11´,12,´13´y 14´ we have to use a depth of (11 mm.) marked CD. For models the 15´,16´ 18´ we have to use a depth of ( 6 mm.) marked CA. Figure 1.- Cilindrical Gauge Figure 2.
EVAPORATOR FAN MOTOR CONDENSER FAN MOTOR ASSEMBLY 6
FAN FORCED COOLING UNIT ACCUMULATOR CONDENSER TUBE LOOP EVAPORATOR RETURN TUBE DRYER 7
STATIC CONDENSER SYSTEM REFRIGERANT UNIT SUCTION LINE (HEAT EXCHANGER) EVAPORATOR CONDENSER TUBE LOOP CONDENSER COMPRESSOR DRYER AUXILIARY SERPENTINE TUBE CAPILLIARY DRAIN PAN 8
If it is required to replace the display or the card, follow the steps shown in the figure. Press the display and slide to the right as the arrow indicates. ODOR FILTER INSTRUCTIONS To install 1.- Remove the filter from the bag 2.- Clean the plastic surface of the cartridge with a dry rag, this to clean the dust. 3.- Place the filter at the top of the cooling tower, as shown in figure A, this filter is attached by clips located in the back of the cartridge.
SECURITY Before connecting the refrigerator to the power source, make sure that all electric connections are isolated, all harnesses are connected and are away from any sharp edges of the cabinet and that all the internal and external electrical grounds of the product are connected. ELECTRIC SYSTEM PTC (POSITIVE TEMPERATURE COEFFICIENT) Contrary to the electromechanical relay, the PTC doesn't have a coil neither mobile contacts.
CONNECTION OF THE CAPACITOR TO THE PTC PTC L CAPACITOR THERMAL PROTECTOR This component (which is placed in the body of the compressor), quickly detects any abnormal rise of temperature or excess amperage draw caused by a mechanical or electric problem or an inappropriate application.
DEFROST CIRCUIT The defrost circuit components are: control card, defrost sensor, relay num. 2 on card, output connector “con 4”, defrost thermostat, fuses and resistance (heater). When the processor has accumulated a Minimum of 8 running hours of the compressor and the sensor registers a high resistance above 8.5 k. the card sends 12 v.d.c. to the relay and energize the heater to start the defrost cycle.
ELECTROMECHANICAL DEFROST SYSTEM There is also an electromechanical defrost system that consists on a timer that controls the time of the cooling and defrost cycles (10 accumulated-working hours of the compressor and 35 minutes for the defrost cycle). DEFROST CYCLE CIRCUIT PHYSICAL COMPONENTS; DEFROST TIMER, THERMOSTAT (KLIXÓN) AND HEATER.
ELECTRONIC DEFROST SYSTEM If the resistance (heater) is connected 20 minutes in the defrost cycle, the next defrost cycle will be increase by 2 hours, if it is connected 30 minutes it will remain as it is, if heater stays energize for 40 minutes it will decrease the next defrost cycle by 2 hours, this way it programs the defrosting within ranges of 8 hours minimum to 12 hours maximum, increasing or diminishing 2 hours, it never carries out the change from 8 to 12 hours or from 12 to 8 hours.
ELECTRONIC CARDS There are 2 different types of electronic cards for these models, one for the deluxe models (y) with internal display and another for super luxury models (z) with external display (see pictures 1 and 2), the following is the way to diagnose if the electronic card is working correctly. 1. First make sure that there is not any false contact in none of the elements of the electric system. 2.
l) Connect the harness display to connector CON3. m) Assemble the tower again. n) Energize the cabinet (connect power supply cord). CARD VERSION SUPERLUXURY (MODEL Z) DELUXE MOFFAT CARD CARD VERSION SUPERLUXURY (MODEL Z): Verification of normal and defrost operation. a) b) c) d) e) f) g) h) i) j) k) l) m) n) Disconnect the cabinet (disconnect power supply cord). Disconnects the harness of the freezer sensor CON1. Disconnect the harness display of the connector CON3. Option 2 leave connected.
TEMPERATURE CONTROL (ELECTROMECHANICAL) This component controls the temperature of the refrigerator maintaining it within the preset limits. The electromechanical control is able to control the temperature through a sensitive hollow bulb (capillary) full with refrigerant, which contracts or expands according to the temperature that is measuring.
DIRECT TEST FOR THE ELECTRONIC CARD TEST OF THE REGULATED VOLTAGE OF THE CARD The tests that are indicated should be carried out through the sensor located in the fresh foods compartment and the potentiometer (temperature control) integrated to the card, whenever some of these components are damaged the complete assembly should be changed, since each card is calibrated with these components. ELECTRONIC CONTROL TABLET When applying 127 A.C.V.
DEFROST OPERATION ELECTRONIC CONTROL TABLET When voltage is applied between the white and black cables the card is energized, after 10 seconds it sends the signal to start the compressor, in that moment a bridge should be connected between the test points GND y T_P, the compressor will then go off, three seconds later it will send the signal to start the Defrost cycle, you should measure 127 V.A.C. between the white and blue cables.
THERMISTORS TEST The thermistors varies their resistance according to the temperature that they detect, at ambient temperature they have little resistance, when diminishing the temperature the value of the resistance is increased, the approximate readings are shown according to a scale of temperatures in the chart, in fact the important thing in the thermistors is that they should not measure a resistance with infinite value (open) or zero resistance (closed), and when warming or cooling down they should va
SPECIAL FEATURES FEATURE SUPER COOLING (QUICK COOLING) When selecting this option the LED2 will come on indicating that the signal is being sent to the card, when the cut temperature indicated by the thermistor and the potentiometer is reached, the card does not send the cut signal to the compressor, it continues working for one more hour without stopping, the LED will go off when the compressor turns off; the time of additional work and how it diminishes the temperature is reflected in the graph.
COOLING TOWER FOR MODELS (W) ELECTRONIC CONTROL TABLET SNAPS NEW DIE CAST CURRENT KNOTS CURRENT DIE CAST CURRENT SCREWS CURRENT CAPS 22
GENERAL CHARACTERISTICS Error! RESÍSTANCE READING IN COLD RESÍSTANSE READING IN WARM 127 VOLTS A.C.V. Refrigerant : R 134- A Refrigerator Polar 12´: 120.5 grs. +/- 3.54 grs. Refrigerator Polar 18´: 100.00 grs.+/- 3.54 grs.
ELECTRIC DIAGRAM FOR MECHANICAL MODELS 24
ELECTRIC DIAGRAM FOR ELECTRONIC MODEL 25
ELECTRIC DIAGRAM FOR ELECTRONIC MODEL 26
PROBLEM 1.- The refrigerator does not cool ( the FAILURE No power at outlet compressor and light bulb do not work) Harness unplugged or false contact. 2.- The refrigerator does not cool (the Potentiometer knob (temperature compressor does not work and the light Control ) to position 0. bulb does). Electronic card does not send signal to the compressor. Refrigerator in Defrost cycle. PTC defective. Thermal Protector open Harness connection with open circuit Compressor (burned out or forced) 3.
THE COMPRESOR USE IN SEDNA (ESTILO) REFRIGERATOR IS: COMPRESSOR CBE121L2G DOE/FIDE FOR SEDNA 17´ Y 19´ THE SAME FORM FOR POLAR 16¨AND 18´ IS 3.8 AMPERES. Compressor CBZN100L2 PARA SEDNA 13´ Y 15´ THE SAME FORM FOR POLAR 12´ AND 14´ IS 3.8 AMPERES. OPERATING PRESSURES: LOW SIDE AND HIGH SIDE : De acuerdo al plano estos son los valores para el SEDNA According to the Label these are the values for sedna (Estilo) is the following.
