Humifix Service Manual R134A
Contents
1. When the malfunction happened at the same time the priority is P2 gt E2 gt E1 gt P1 7 5 Set humidity operation 1 In this operation the range of work is 35 RH 80 RH 2 The fan keeps the same speed as last mode 3 The action of compressor in this operation is like the below graph show Ha Compressor amp fan on Hs 5 E y Compressor amp fan off Hs s 7 6 Continually dehumidify operation In this operation the compressor and fan will be working continually unless there is a water full protection or sensor fault protection The Setting humidity operation is unapplied 8 Basic test procedure 8 1 Defective compressor Compressors are single phase depending on the model unit All compressor motors are permanent split capacitor type using only a running capacitor across the start and run terminal All compressors are internally spring mounted and externally mounted on rubber isolators 8 1 1 Compressor wiring test 11 Remove compressor terminal box cover and disconnect wires from terminals Using an ohmmeter check continuity across the following Terminal C and S no continuity Open winding replace compressor Terminal C and R no continuity Open winding replace compressor Terminal R and S no continuity Open winding replace compressor 8 1 2 Ground test Use an ohmmeter to set on its highest scale Touch one lead to the compressor body clean poi2. within 3 minutes If the auto restart is available the compressor also needs 3 minutes delay to start 2 Anti freezing protect control P1 If the temperature of the evaporator falls below 1 C for 15minutes the compressor turn off to protect the evaporator from freezing Compressor will restart again after 9 minutes See the below graph TC 1 Cj Comp On Off Fan On On t Add up 15 mins Add up 9 mins 3 Water full protection There is one switch on the top of water tank S1 a At running status if the water level of water exceeds the safety water level and the S1 closed the unit will protect by itself It will shut down all of load and back to work provided the water tank is empty by manual b At wake status if the water level of water exceeds the safety water level and the S1 closed the unit will protect by itself It will back to work provided the water is empty by manual Note If it has P2 protect the unit will under lock status the button of control plane could not operated until the P2 protect have been delete 4 Sensor malfunction If the A D of sensor is not at the range of 0 05 4 95V the sensor is broken If the TH sensor has this malfunction the display will show E1 if it is TC the display will show E2 10 LED display Stand for E1 Ha sensor malfunction E2 TC sensor malfunction P1 Unit is defrosting P2 Water full protection Malfunction display
3. 6 Pressurize system to 30 PSIG with proper refrigerant and boost refrigerant pressure to 150 PSIG with dry nitrogen 7 Leak test complete system with electric halogen leak detector correcting any leaks found 8 Reduce the system to zero gauge pressure 9 Connect vacuum pump to high side and low side of system with deep vacuum hose or copper tubing Do not use regular hoses 10 Evacuate system to maximum absolute holding pressure of 200 microns or less NOTE This process can be speeded up by use of heat lamps or by breaking the vacuum with refrigerant or dry nitrogen at 5 000 microns Pressure system to 5 PSIG and leave in system a minimum of 10 minutes Recover refrigerant and proceed with evacuation of a pressure of 200 microns or a minimum of 10 11 Break vacuum by charging system from the high side with the correct amount of refrigerant specified This will prevent boiling the oil out of the crankcase NOTE If the entire charge will not enter the high side allow the remainder to enter the low side in small increments while operating the unit 12 Restart unit several times after allowing pressures to stabilize Pinch off process tubes cut and solder the ends Remove pinch off tool and leak check the process tube ends 8 2 4 Special procedure in the case of compressor motor burnout 1 Recover all refrigerant and oil from the system 2 Remove compressor capillary tube and filter drier from the system 3 Flush evaporator
4. Continue Pad Select for the dehumidifier to operate continuously for maximum dehumidification until the bucket is full The Humidity set control pads cannot be used when Continuous operation is on Press this pad again to cancel Continuous operation Humidity Selector The humidity level can be set within a range of 35 RH Relative Humidity to 85 RH Relative Humidity For drier air rotate the Selector counter clockwise for a lower percent value For damper air rotate the Selector clockwise for a higher percent value When set the selector to CONT position the dehumidifier will operate continuously for maximum dehumidification until the bucket is full To turn off the unit rotate the selector to the OFF position Defrosting indicator light This indicator light illuminates when frost builds up on the evaporator coils the compressor will cycle off and the fan will continue to run until the frost disappears Power on indicator light This indicator light illuminates when connect to the power And flashes at 5Hz under temperature sensor malfunction Bucket full indicator light This indicator light illuminates when the bucket is full or the bucket is not in right position After empty the bucket and replace in the proper position this light turns off 3 Dimension Dimension Mo
5. Friedrich must have all lines properly plugged with the plugs from the replacement compressor 8 3 Fan motor A single phase permanent split capacitor motor is used to drive the evaporator blower and condenser fan A self resetting overload is located inside the motor to protect against high temperature and high amperage conditions Fan motor test 1 Determine that capacitor is serviceable 2 Disconnect fan motor wires from fan speed switch or system switch 3 Apply live test cord probes on black wire and common terminal of capacitor Motor should run at high speed 4 Apply live test cord probes on red wire and common terminal of capacitor Motor should run at low speed 5 Apply live test cord probes on each of the remaining wires from the speed switch or system switch to test intermediate speeds 8 4 Capacitor A run capacitor is wired across the auxiliary and main winding of a single phase permanent split 16 capacitor motor such as the compressor A single capacitor can be used for each motor or a dual rated capacitor can be used for both The capacitor s primary function is to reduce the line current while greatly improving the torque characteristics of a motor The capacitor also reduces the line current to the motor by improving the power factor of the load Run capacitor hook up line side of the capacitor is marked with a red dot and is wired to the line side of the circuit RUN CAPACITOR Capacitor
6. condenser and all connecting tubing with dry nitrogen or equivalent to remove all contamination from system Inspect suction and discharge line for carbon deposits Remove and clean if necessary 4 Reassemble the system including new drier strainer and capillary tube 5 Proceed with processing as outlined under hermetic component replacement 8 2 5 Rotary compressor special troubleshooting and service Basically troubleshooting and servicing rotary compressors is the same as on the reciprocating compressor with only a few exceptions 15 1 Because of the spinning motion of the rotary the mounts are critical If vibration is present check the mounts carefully 2 The electrical terminals on the rotary are in a different order than the reciprocating compressors The terminal markings are on the cover gasket Use your wiring diagram to insure correct connections 8 2 6 Refrigerant charge 1 The refrigerant charge is extremely critical It must be measured charge carefully as exact as possible to the nameplate charge 2 The correct method for charging the rotary is to introduce liquid refrigerant into the high side of the system with the unit off Then start compressor and enter the balance of the charge gas only into the low side The introduction of liquid into the low side without the use of a capillary tube will cause damage to the discharge valve of the rotary compressor NOTE All inoperative compressors returned to
7. gets onto your skin or clothes wash it well with clean water Do not use the remote of the batteries have leaked The chemical in batteries could cause burns or other health hazards m 2 Display MDT 10DEN3 QA3 MDT 20DEN3 QA3 us Bucket full Power on indicator indicator Continuous operation light green Display light red on indicator light green POWER WATERFULL CONTINUOUS Power pad Humidity set Continue pad control pads Display for electronic models Shows the set humidity level while setting then shows the actual 5 accuracy room humidity level Error Codes E1 Humidity sensor error Unplug the unit and plug it back in If error repeats call for service E2 Temperature sensor error Unplug the unit and plug it back in If error repeats call for service Protect Codes P1 Unit is defrosting Allow the unit to automatically defrost The protective will clear after the unit self defrosts P2 Bucket is full or bucket is not in the right position Empty the bucket and replace in the right position NOTE When more than one errors occur the priority of the code display order is P2 E2 E1 P1 Humidity Set Control Pads The humidity level can be set within a range of 35 RH Relative Humidity to 80 RH Relative Humidity in 5 increments For drier air press the pad and set to a lower percent value For damper air press the pad and set to a higher percent value 5
8. not touch operation the product with wet hands There is risk of fire or electric shock e Do not place a heater or other appliance near the power cable There is risk of fire and electric shock e Do not allow water to run into electric parts It may cause fire failure of the product or electric shock e Do not store or use flammable gas or combustible near the product There is risk of fire or failure of product e Do not use the product in a tightly closed space for a long time Oxygen deficiency could occur When flammable gas leaks turn off the gas and open a window for ventilation before turn the product on Do not use the telephone or turn switches on or off There is risk of explosion or fire e If strange sounds or small or smoke comes from product Turn the breaker off or disconnect the power supply cable There is risk of electric shock or fire Stop operation and close the window in storm or hurricane If possible remove the product from the window before the hurricane arrives There is risk of property damage failure of product or electric shock e Do not open the inlet grill of the product during operation Do not touch the electrostatic filter if the unit is so equipped There is risk of physical injury electric shock or product failure When the product is soaked flooded or submerged contact an Authorized service center There is risk of fire or electric shock e Be caution that water could not enter the prod
9. test 1 Remove capacitor from unit 2 Check for visual damage such as bulges cracks or leaks 3 For dual rated apply an ohmmeter lead to common C terminal and the other probe to the compressor HERM terminal A satisfactory capacitor will cause a deflection on the pointer and then gradually move back to infinity 4 Reverse the leads of the probe and momentarily touch the capacitor terminals The deflection of the pointer should be two times that of the first check if the capacitor is good 5 Repeat steps 3 and 4 to check fan motor capacitor NOTE A shorted capacitor will indicate a low resistance and the pointer will move to the 0 end of the scale and remain there as long as the probes are connected An open capacitor will show no movement of the pointer when placed across the terminals of the capacitor 17 9 Characteristic of temperature sensor een ER ee Temp C 10 62 2756 14 6181 4 3874 9 E 7079 18 ES 91 8 45 4 21 26 8 56 3694 19 132631 46 4 0459 _6 set a 120581 48 46 5725 11 5 RS 2 39 8239 10 52 31918 8 352024 27 91245 54 2959 33 3269 28 8 7198 55 2 8442 E LN PA E 2 4 28 3459 31 7 6241 58 2 5397 7 24 1932 34 6 6835 61 2 2725 40 207184 37 58786 64 20373 11 19 6891 38 5 6296 65 1 9653 EE 17 8005 40 5 1752 67 1 83 14 16 9341 41 4 9639 68 1 7665 18 10 Troubleshooting In general possible trouble is cl
10. 0 400 Ibs 10 Low Pressure Gauge 30 150 Ibs 11 Vacuum Gauge 0 1000 microns 8 2 2 Equipment must be capable of 1 Recovery CFC s as low as 5 2 Evacuation from both the high side and low side of the system simultaneously 3 Introducing refrigerant charge into high side of the system 4 Accurately weighing the refrigerant charge actually introduced into the system 5 Facilities for flowing nitrogen through refrigeration tubing during all brazing processes 8 2 3 Hermetic compressor replacement The following procedure applies when replacing components in the sealed refrigeration circuit or repairing refrigerant leaks Include Compressor condenser evaporator capillary tube refrigerant leaks etc 1 Recover the refrigerant from the system at the process tube located on the high side of the system by installing a line tap on the process tube Apply gauge from process tube to EPA approved gauges from process tube to EPA approved recovery system Recover CFCs in system to at least 5 2 Cut the process tube below pinch off on the suction side of the compressor 3 Connect the line from the nitrogen tank to the suction process tube 14 4 Drift dry nitrogen through the system and unsolder the more distant connection first Filter drier high side process tube etc 5 Replace inoperative component and always install a new filter drier Drift dry nitrogen through the system when making these connections
11. RW A Service Manual DEHUMIDIFIERS T SERIES Humifix 10 Humifix 20 6 Humifix CONTENTS UR PreCaULION AEE E ucina data noi scususdnndecsssacsutescdndtensnesdnaceddonevedsuecanauoedsauenysnnuavesesd scuantend 1 1 1 Safety Brerauttensieesdereger GEES papado iacicessopea pi tadiasdoouandas EES EES 1 1 2 Warhing EE 1 KI UE 5 NIE E 0 4 Refrigerant Cycle Diagral sscssccsssencssseseesseeseesseeeseeeseeesecesecesseeesnensneseneeaeesasnesenenseesenenaneesenens 7 5 Wiring l L TE 8 6 e 9 7 Electronic function Only for Electric Models nn cereserenesenaseannasa 9 Tel Terms and GETINITIONS eseina sete ecte ce ue EEN 9 7 2 Electric part assembly condition that USC cc sccscessseeeeseeesneeesseesseeesseeessneesseneeeeaeeneesneeseneneas 9 7 3 PCB working environment cseccecerseecsseesseessceseneeseecseeesneesecesenessneeseesseeseneeaeesaesesenesenesenerseeenenens 9 7 4 Protection funcilons assi nnman au nnen Ee 10 7 5 Set humidity operation quasascosssaopissseatisto SEENEN EE 11 7 6 Continually dehumidify Operation cecsecssesseeeseessesseesseseeeseesseesseeeseneseeesseesseeseeeeseneseneaseaseaes 11 8 Basic test PrOCOCuUre cccsecesesesseesseeesseesseeeessoeessseesssanessenesusaeeesseesesaesegeeesasneueaseeesaaoeeasaeesegoeensaeneas 11 8 1 Defective compressor isso sos sstserasoresaceracacenaaaataaasatacesasaaeara casas S Mn Paaa ria anta a
12. allation may cause fore or electric shock e Use the correctly rated breaker of fuse There is risk of fire or electric shock e Do not modify or extend the power cable There is risk of fire or electric shock e Do not install remove or reinstall the unit by yourself customer There is risk of fire electric shock explosion or injury e Be caution when unpacking and installing the product Sharp edges could cause injury be especially careful of the case edges and the fins on the condenser and evaporator e For installation always contact the dealer or an Authorized service center There is risk of fire electric shock explosion or injury e Do not install the product on a defective installation stand 1 It may cause injury accident or damage to the product e Be sure the installation area does not deteriorate with age If the base collapses the air conditioner could fall with it causing property damage product failure and personal injury e Do not let the air conditioner run for a long time when the humidity is very high and a door or a window is left open Moisture may condense and wet or damage furniture 6 Take care to ensure that power cable could not be pulled out or damaged during operation There is risk of fire or electric shock e Do not place anything on the power cable There is risk of fire or electric shock e Do not plug or unplug the power supply plug during operation There is risk of fire or electric shock e Do
13. assified in three kinds One is called Starting Failure which is caused from an electrical defect another is ineffective Air Conditioning caused by a defect in the refrigeration circuit and improper application and the other is called the Structure Damage Problem What to check Unit does not start eMake sure the dehumidifier s plug is pushed completely into the outlet eCheck the house fuse circuit breaker box eDehumidifier has reached its pre set level or bucket is full eWater bucket is not in the proper position Dehumidifier does not dry the air as it should eDid not allow enough time to remove the moisture eMake sure there are no curtains blinds or furniture blocking the front or back of the dehumidifier eThe humidity control may not be set low enough eCheck that all doors windows and other openings are securely closed eRoom temperature is too low below 5 C 41 F eThere is a kerosene heater or something giving off water vapor in the room The unit makes a loud noise when operating eThe air filter is clogged eThe unit is tilted instead of upright as it should be eThe floor surface is not level Frost appears on the coils eThis is normal The dehumidifier has Auto defrost feature eHose to connector or hose connection may be loose Water on floor elntend to use the bucket to collect water but the back drain plug is removed EL E2 P1 or P2 appear eThese are error
14. codes See the CONTROL PADS ON THE in the display DEHUMIDIFIER section 1 19
15. compressor external type 1 Remove overload 2 Allow time for overload to reset before attempting to test 3 Apply ohmmeter probes to terminals on overload wires There should be continuity through the overload 8 1 6 Terminal overload internal Some model compressors are equipped with an internal overload The overload is embedded in the motor windings to sense the winding temperature and or current draw The overload is connected in series with the common motor terminal Should the internal temperature and or current draw become excessive the contacts in the overload will open turning off the compressor The overload will automatically reset but may require several hours before the heat is dissipated 8 1 7 Checking the internal overload 1 No power to unit remove the leads from the compressor terminals 2 Using an ohmmeter test continuity between terminals C S and C R If not continuous the compressor overload is open and the compressor must be replaced 13 8 2 Sealed refrigeration system repairs 8 2 1 Equipment require 1 Voltmeter Ammeter Ohmmeter E P A Approved Refrigerant Recovery System Vacuum Pump capable of 200 microns or less vacuum Acetylene Welder Electronic Halogen Leak Detector G E Type H 6 or equivalent o N O oO A WO SD Accurate refrigerant charge measuring device such as a Balance Scales 1 2 oz accuracy b Charging Board 1 2 oz accuracy 9 High Pressure Gauge
16. de T 10L T 20L 4 Refrigerant Cycle Diagram The figure below is a brief description of the important components and their function in what is called the refrigeration system LIQUID SIDE CAPILIARY TUBE mm EVAPORATOR CONDENSER kk fe P gt GAS SIDE COMPRESSOR a 5 Wiring Diagram MDT 10DEN3 QA3 202026290017 Fan jf Display board MS CN10 e l Red Black Blue RY3 Gute Comp CNS ks ATTN Main board M CNS eet CN1 CN2 CN oO IX lies REA Fan H q A b ten Ae Be SE hite dh Red Humi Pipe Water E EH Brown Black Temp switch MDT 20DEN3 QA3 202026290138 Notes Fan Display board This symbol GEN CN10 indicates the M element is ie ee optional the actual shape 4 g shall prevail a cc BEE Comp CN9 CN6 E Blue 1 N e CAP 4 M CNS RY3 Usa XE CN1 CN2 CN Optional ae SC LOP OLP CN7 FAN H Blue White R Humi Pipe Water Power Y G Green an P Temp switch ea Black ae Bro
17. nt of contact as a good connection is a must and the other probe in turn to each compressor terminal If a reading is obtained the compressor is grounded and must be replaced 8 1 3 Checking the compressor efficiency The reason for compressor inefficiency is normally due to broken or damaged suction and or discharge valves reducing the ability of the compressor to pump refrigerant gas This condition can be checked as follows 1 Install a piercing valve on the suction and discharge or liquid process tube 2 Attach gauges to the high and low sides of the system 3 Start the system and run a cooling or heating performance test If test shows A Below normal high side pressure B Above normal low side pressure 12 C Low temperature difference across coil The compressor valves are faulty replace the compressor 8 1 4 Terminal overload external Some compressors are equipped with an external overload which is located in the compressor terminal box adjacent to the compressor body The overload is wired in series with the common motor terminal The overload senses both major amperage and compressor temperature High motor temperature or amperage heats the disc causing it to open and break the circuit to the common motor terminal Heat generated within the compressor shell is usually due to 1 High amperage 2 Low refrigerant charge 3 Frequent recycling 4 Dirty condenser 8 1 5 Terminal overload Test
18. nta anna 11 8 2 Sealed refrigeration system repairs ssssssssuseursnnsunnunnunnnnnnunennnunnunnunnnnnunnennunnunnnnnnnnnnnnannnnennn ennen nnn 14 8 3 Fan motor eseeetegeeEEESSEEESREEESEREEEEREREEEREEEERSEEESSEEEEEREEESEREEESEEEEEEREEESREEEEEEEESEEEEEERESEESEESREEEEERSEEEREEEEEKEEEEEEEE EE 16 8 4 Capacitor sciccteciicetaccacesccsd evens vaenddvcaccbasheceracdeid ck Soda tect scans stated EE 16 9 Characteristic of temperature sensor ceseeeceseesseesseeeseeeseeseeeeseeesseesseesseesenesseassueeseeesnesenanseaenaes 18 10 TroubleShooting TE 19 1 Precaution 1 1 Safety Precaution eTo prevent injury to the user or other people and property damage the following instructions must be followed Incorrect operation due to ignoring instruction will cause harm or damage Before service unit be sure to read this service manual at first 1 2 Warning 4 Installation e Do not use a defective or underrated circuit breaker Use this appliance on a dedicated circuit There is risk of fire or electric shock e For electrical work contact the dealer seller a qualified electrician or an Authorized service center Do not disassemble or repair the product there is risk of fire or electric shock e Always ground the product There is risk of fire or electric shock Install the panel and the cover of control box securely There is risk of fire of electric shock e Always install a dedicated circuit and breaker Improper wiring or inst
19. roduct for special purposes such as preserving foods works of art etc It is a consumer air conditioner not a precision refrigerant system 3 There is risk of damage or loss of property e Do not block the inlet or outlet of air flow It may cause product failure e Use a soft cloth to clean Do not use harsh detergents solvents etc There is risk of fire electric shock or damage to the plastic parts of the product e Do not touch the metal parts of the product when removing the air filter They are very sharp There is risk of personal injury e Always insert the filter securely Clean the filter every two weeks or more often if necessary A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage e Do not insert hands or other object through air inlet or outlet while the product is operated There are sharp and moving parts that could cause personal injury e Do not drink the water drained from the product It is not sanitary could cause serious health issues e Use a firm stool or ladder when cleaning or maintaining the product Be careful and avoid personal injury e Replace the all batteries in the remote control with new ones of the same type Do not mix old and new batteries or different types of batteries There is risk of fire or explosion e Do not recharge or disassemble the batteries Do not dispose of batteries in a fire They may burn of explode elf the liquid from the batteries
20. uct There is risk of fire electric shock or product damage e Ventilate the product from time to time when operating it together with a stove etc There is risk of fire or electric shock e Turn the main power off when cleaning or maintaining the product There is risk of electric shock When the product is not be used for a long time disconnect the power supply plug or turn off the breaker There is risk of product damage or failure or unintended operation a CAUTION e Always check for gas refrigerant leakage after installation or repair of product Low refrigerant levels may cause failure of product Install the drain hose to ensure that water is drained away properly Abad connection may cause water leakage 6 Keep level even when installing the product To avoid vibration of water leakage e Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods It may cause a problem for your neighbors e Use two or more people to lift and transport the product Avoid personal injury e Do not install the product where it will be exposed to sea wind salt spray directly It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins could cause product malfunction or inefficient operation Operational e Do not expose the skin directly to cool air for long periods of time Do not sit in the draft This could harm to your health e Do not use the p
21. wn or Black Kain board a 6 Features X LED display for some models X Auto Shut off X Continuous dehumidification mode for some models X Water full protection X Auto defrost Anti freezing control ZS Turbo key function and normal key function Optional X Self diagnosis and auto protection function Wait 3 minutes before resuming operation X Auto restart When the power supply is interrupted and then restore the unit automatically restore the previous function setting 7 Electronic function Only for Electric Models 7 1 Terms and definitions TC Temperature of evaporator Ha Humidity of indoor ambient HS The set humidity 7 2 Electric part assembly condition that use 1 Scope of application of voltage of the power 220 240VAC 50Hz 1phase 220 230VAC 60Hz 1phase 2 Working environment 5 C 35 C 3 The humidity of electric part working environment lt RH95 4 The electric storage working temperature lt 60 C 7 3 PCB working environment 1 Tolerance of measure indoor side humidity 5 RH the scope of application 35 RH 80 RH 2 Tolerance of measure evaporator temperature 1 C the scope of application 5 C 35 C m 7 4 Protection function 1 Time delay safety control 3 minutes When the compressor is stopped in operation it needs 3 minutes delay to restart When the setting humidity is reached in operation the compressor will stop and it will not start again
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