Service manuals for cold rooms
Contents
1. Clean or replace valve l 2 replace 3 Clean or replace strainer Replace power assembly Adjust or replace thermostat Replace valve Check for plugged external equalizer Resize compressor Replace control Rewire control Replace control Relocate element Replace or adjust control Rewire defrost control Replace defrost control Replace or adjust control Clean or replace solenoid valve Relocate unit or provide heat Clean tube Check drain heater element and repair or Replace trough 4 Install baffle properly 5 Adjust humidiplate 6 Adjust door or replace gasket Hair Bio Medical Part IV Technical Drawings power wire monoblock unit prey ee ccccccccccce dc ccccccccccccccccccccccccce dc ccccccccccccccccccccccsscesccscheccccccesccsce installation schematic drawing The monoblock unit structure Condenser motor Filter drier Solenoid valve Wire A E t Expansion valve vaporator As fie me Ir f H Pa Wt Ie Hign and low pressure 00 C To L loo l OU Ke J C tf CP Controller thermostat Condenser monoblock unit structure 11 Hair Bio Medical Cooling principle chart Expansion valve Filter drier JIVIINIIIVAS A h vaporator MOTO evaporator D Solenoid valve Condenser moto Condenser gt V lt gt a S SS i d e o V TN 7 Compressor Cooling principle ch2. noisy Unit low on capacity 2 Thermostat contacts stuck closed 3 Excessive load 4 Evaporator coil iced 5 Restriction in refrigerant system 6 Dirty condenser 7 Restricted air over evaporator 8 Inefficient compressor 1 Traps in hot gas and or suction lines 2 Refrigerant velocity too low in risers 3 Shortage of refrigerant 4 Liquid refrigerant flooding back to compressor 5 Gas oil ratio low 6 Plugged expansion valve or strainer 7 Compressor short cycling 8 Superheat too high at compressor suction 1 Lack of compressor oil 2 Tubing rattle 3 Mounting loose 4 Oil slugging 5 Refrigerant flooding compressor 6 Dry or scored shaft seal 7 Internal parts of compressor broken or worn 8 Compressor drive coupling loose 1 Ice or dirt on evaporator 2 Expansion valve stuck or dirty 3 Improper TXV superheat adjustment 4 Wrong size expansion valve 5 Excessive pressure drop in evaporator 6 Clogged strainer 2 Clean contacts or replace thermostat 3 Check heaters load and replace unit accordingly replace insulation 4 Defrost unit and check operation 5 Locate and remove 6 Clean condenser 7 Determine cause and correct 8 Check compressor valves and repair 1 Reroute lines to provide proper pitch 2 Resize risers or install oil return traps 3 Repair leak and recharge 4 Adjust expansion valve alter refrigerant charge on capillary tube system 5 Add 1
3. is on the outside 5 Hair Bio Medical before setting roof 5 Roof Panels installed last 6 Affix Door handle and emergency release 793 silicon joints between panels Clean panels with cleaner and cloth provided 7 Connect eae the door heater monoblock unit wire connect the lamp monoblock unit lamp control Plug into duty sharing power source connect the power outflow and allow to pull down to temperature in line with normal cold storage panel i i condenser inflow good refrigeration practice monoblock unit connecting wire 8 Put up the shelves to either two or three walls 9 Place the Ice pack on the shelves with holes 6 Hair Bio Medical Part IH Servicing Manual Possible Cause Corrective Action Power failure 1 Contact power company Disconnect switch open 2 Close switch and check circuits Burned out compressor motor 3 Replace Control circuit open 4 Locate cause and repair Compressor fails l Overload protector tripped a Check overload to start no hum Thermostat setting too high b Set to lower temperature Low pressure control open c Reset and check pressures High pressure control open d Reset and check pressures 0o a O oA WO NO Loose wiring 5 Repair wiring Rewire unit 1 Improperly wired 2 Determine reason and correct Compressor will 2 Low voltage to unit 3 Replace compressor motor not start hums 3 Burned out compressor mot
4. pt of oil for each 10 1b of refrigerant added to the factory charge 6 Clean or replace 7 See items under entry Compressor starts and runs but short cycles 8 Change location of TXV bulb or adjust superheat to return wet refrigerant to the compressor 1 Add oil to correct level 2 Reroute tubing 3 Repair mounting 4 Adjust oil level or refrigerant charge 5 Check expansion valve for leak or oversized orifice 6 Check oil level 7 Overhaul compressor 8 Tighten coupling and check alignment 1 Clean coil or defrost 2 Clean or replace expansion valve 3 Adjust expansion valve 4 Replace valve 5 Adjust expansion valve 6 Clean or replace strainer 7 Subcool liquid or add refrigerant Hair Bio Medical 1 Control setting too high 1 Adjust control Expansion valve too small 2 Replace valve Evaporator too small Na 3 Replace coil Insufficient air circulation Space 4 Correct circulation Shortage of refrigerant temperature To 5 Repair leak and recharge Expansion valve plugged high 6 Clean or replace Inefficient compressor ns 7 Check efficiency 8 Clear restriction or resize lines Restricted or undersized refrigerant Lines 9 Clean and defrost evaporator 9 Evaporator iced or dirty a 1 Superheat setting too low 1 Adjust superheat setting Suction line 2 Expansion valve stuck open 2 Clean or replace valve frosted or 3 Evaporator fan not running 3 Correc
5. Service manual for Haier Cold Freezer rooms only Sincere Forever Haier Group Haier Medical and Laboratory Products Co Ltd web www haiermedical com Add No 1 Haier Road 266101 Qingdao P R China Please read this manual carefully before use Please keep this manual properly for future reference 1 Hair Bio Medical Haier APR AR Haier Cold Freezer Room Technical Handbook With Monoblock Unit Table of Contents Part I Haier Monoblock Unit 0c eee ence e es 3 Part II Installation 0 ccc cece cece ccc ecceceecennees 4 6 Part III Servicing manual 0 c cece eee 7 10 Part IV Technical DrawingS 0 c cece ence cee e cece 11 14 Haier Medical and Laboratory Products Co Ltd 2 Hair Bio Medical Part I Haier monoblock unit introduction The Haier monoblock units are composed of a condenser unit an evaporator and a control panel together in a single compact pack This configuration allows the highest simplicity on the hand of installation turning monoblock the most versatile handy solution for all kind of cold freezer room projects The monoblock refrigeration unit can meet the freezing demand in the hotel restaurant hospital agriculture biology and chemical industry the temperature of which can be kept with inO 8C 15 25 C Monoblock units are equipped with Famous compressor brand Maneurop Danfoss Copeland or Tecumseh Reliable pe
6. art Controlling panel 12 Hair Bio Medical JCI RJ 2 JU l N L Voltage connection N Neutral connection M1 Compressor M2 Condenser motor M3 Evaporator motor J LIL L CMI LT WY EXMO Loo HM WA AHOK ver E era ture xR40C E Make aie R cy f A Tu ls Running Ay RF Overload r XR40C E Defrost us DC X g Defrost h Lighting 8 Electrical circuit diagram K2 Lighting RJ Themo relay K1 Control connection JC Contactor DC ELECTROMAGNETISM QJZ Crankcase heater ZJC Relay XR40C E Tempreture thermostat 13 Hair Bio Medical Electrical principle chart N JC1 Comp contactor K Start switch W Temp control power supply WK1 Comp WK2 Evap fans WK3 Defrost HP High ang low pressure switch RJ Overload relay ZJ Intermediate relay ZJ1 Evap fans intermediate relay ZJ2 Condensing fans intermediate relay DC1 Defrosting solenoid valve DC2 Refrigerating solenoid valve M1 Compressor Comp M2 Condensing fans M3 Evaporating fans D1 Run light D2 Defrosting light D3 Overload light Hair Bio Medical
7. or 4 Replace compressor and trips 4 Mechanical problems in 5 Install crankcase heater overload compressor protector 5 Liquid refrigerant in compressor crankcase 1 Replace overload protector 2 Determine reason and correct 3 Determine reason and replace 4 Open compressor discharge Defective overload protector l service valve Purge possible Low voltage to unit o overcharge of refrigerant Provide sufficient Defective run capacitor l l condenser cooling air to unit High discharge pressure l 6 Properly charge system with refrigerant Increase load on evaporator Suction pressure too high Compressor 7 Reduce air flow over evaporator Compressor too hot starts and runs Purge overcharge of refrigerant Shorted motor winding 1 2 3 4 5 Suction pressure too low 6 7 8 9 but short cycles Replace compressor valves Dirty or iced evaporator 8 Properly charge system with 10 Low pressure control differential refrigerant set too close 9 Replace compressor 11 High pressure control differential 10 Increase air flow over evaporator set too close Replace broken belt Replace 12 Erratic thermostat defective fan motor 11 Readjust differential 12 Readjust or replace control 13 Relocate or replace thermostat a 1 Short of refrigerant 1 Repair leak and recharge unit 7 Hair Bio Medical Unit operates excessively Compressor loses oil Compressor
8. rformance and long life span with well known brand refrigeration parts EBM fan motor Castel Solenoid valve Danfoss high low pressure controller Danfoss filter direr Eliwell thermostat Self supporting housing of galvanized plate Easily detachable front panels Hermetic compressors with engine thermal insulation Electronic control panel with 52 programmable parameters Condensation by air 3 Hair Bio Medical Part Il INSTALLATION NOTE Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes and regulations and experienced with this type of equipment CAUTION Sharp edges and coil surfaces are a potential injury hazard Avoid contact with them Installation schematic drawing Push into the hole Water pack storage Installation schematic drawing 1 Monoblock Cooling freezing Units Panels Doors Service tools Ice 4 Hair Bio Medical pack and Shelves are packed separately in wooden cartons wooden cartons corner panel 2 Installation normally starts with the back wall panels or corner panel 10CKS 3 Wall panels and floor lock together with cam locks Haier cold freezer rooms are erected from inside so installation in confined areas is simple Monoblock Units roof 4 Monoblock Cooling freezing Units are lifted into position and locked to wall panels by pop rivets or self tapping screws Note Remove power cable from casing to ensure it
9. t problem sweating 4 Overcharge of refrigerant 4 Correct charge Liquid line 1 Restricted drier or strainer o 1 Replace drier or strainer frosted or 2 Liquid line shut off valve l l 2 Open valve sweating Partially closed o 1 Expansion valve open too wide 1 Adjust expansion valve Hot liquid line 2 Refrigerant shortage 2 Repair leak and recharge Top of condenser 1 Refrigerant shortage 1 Repair leak and recharge Coils cool when 2 Refrigerant overcharge 2 Remove part of charge unit is operating 3 Inefficient compressor 3 Check efficiency and correct 1 Apply hot wet cloth to expansion valve Unit in 1 Ice plugging expansion valve o body an increase in suction pressure indicates vacuum frost on orifice moisture install expansion valve 2 Expansion valve strainer l a new drier only plugged 2 Clean strainer or replace valve 1 Overcharge of refrigerant no Purge overcharge 2 Air in system Purge air High head 3 Dirty condenser Na Clean condenser pressure 4 Unit in too hot location Relocate unit 5 Water cooled condenser plugged 1 Shortage of refrigerant Clean or replace condense Repair leak and recharge 2 Cold unit location Low head no Provide warm condenser air 3 Inefficient compressor valves pressure oe Replace leaky valves 4 Leaky oil return valve in oil Repair or replace separator 1 Evaporator overloaded 1 See previous entry Unit operates 2 Expansion val
10. ve stuck open excessively High suction 3 Expansion valve too large 2 Repair or replace valve pressure 4 Leaking compressor suction valves 3 Replace valve 5 Evaporator too large 4 Replace suction valves or compressor 9 Hair Bio Medical po 5 Resize evaporator Low suction pressure Evaporator coil iced over Cold room remains in defrost cycle Water collects in bottom of EMC cooler 1 Shortage of refrigerant 2 Evaporator underloaded 3 Liquid line strainer clogged 4 Plugged expansion valve 5 Last charge on TX V power assembly 6 Space temperature too low 7 Expansion valve too small 8 Excessive pressure drop through Evaporator 9 Oversized compressor 1 Automatic defrost control erratic or inoperative 2 Automatic defrost control improperly wired 3 Defective defrost control thermal element 4 Improperly installed control thermal element 5 Defrost control termination point too low 1 Defrost control incorrectly wired 2 Automatic defrost control inoperative 3 Defrost control termination point too high 4 Defrost solenoid valve stuck open 5 Room temperature too low below 55 F or 12 8 C 1 Drain tube plugged 2 Drain tube frozen 3 Split drain trough 4 Evaporator baffle not properly installed 5 Humidiplate not adjusted properly 6 Door gasket not sealing properly 10 1 Repair leak and recharge 2 Clean or defrost evaporator oN
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