Friedrich SH20L30-A User's Manual
Contents
1. AIV epis uonoeiiq eJnjsio N A619u3 ZM H 09 sonsuejoejeu 291139313 Ayoedey Buioo5 I POWN ZH 0S 5 ZH 09 sduy sduy ZO ul 1909 1010 eBueuosi ZH9H 09 Way 9b1ey9 sduy sduy u siq e H duo 4 93a due rac Jojo qng pinbi7 uon ns abseyosig dW3L ssn saunssaud MASN30N0O2 4930 4 930 SONILVA 1VII9 193713 ONILVY3dO WOlVHOdVA3 MIV SOlIVHOdVA3 eyeq eoueuuojeg COMPONENT OPERATION AND TESTING WARNING DISCONNECT ELECTRICAL POWER TO THE UNIT BEFORE SERVICING OR TESTING COMPRESSORS Compressors are single phase 208 230 volt 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 Line Voltage Overload The compressor is equipped with an internal line voltage overload This overload is embedded in the windings of the motor to sense the motor temperature The overload will open and disconnect the power to the motor due to high temperatures caused by 1 Alocked rotor 2 Excessive running amps 3 High discharge temperature 4 Low refrigerant charge FIGURE 1 INTERNAL OVERLOAD LINE BREAK INTERNAL OVERLOAD OHMMETER2. SHROUD CONDENSER 61804901 MODELS N gt gt 55 60846016 GASKET CHASSIS 61717301 1 1 1 780 OPTIONAL ACCESSORY ITEMS DRAIN KIT DC 2 01900235 1 1 1 START CAP RELAY 01900312 o o 2 2 2 2 2 2 2 3 3 2 2 3 1 1 3 3 2 2 3 3 3 3 4 4 3 3 6 6 7 2 2 3 3 0 0 9 9 5 7 1 7 7 5 5 2 4 6 6 0 1 8 8 41 18 19 Use Factory Certified Parts y riedric FRIEDRICH AIR CONDITIONING CO Post Office Box 1540 San Antonio Texas 78295 1540 4200 N Pan Am Expressway San Antonio Texas 78218 5212 210 357 4400 FAX 210 357 4480 www friedrich com Printed in the U S A HG SVC PRTS 05 4 05
3. COMPRESSOR WINDING TEST Figure 2 Remove the compressor terminal box cover and disconnect the wires from the terminals Using an ohmmeter check continuity across the following FIGURE 2 COMPRESSOR WINDING TEST Testing Procedures Terminal C and S no continuity open winding replace compressor Terminal C and no continuity open winding replace compressor Terminal R and S no continuity open winding replace compressor Terminal C and the shell ofthe compressor continuity grounded motor replace compressor Should continuity exist between terminals R and S but not between terminals C and S and C and the internal overload may be open If the compressor is extremely hot allow it sufficient time to cool It may require as long as one hour for the compressor to cool sufficiently for the internal overload to close GROUND TEST Use an ohmmeter set on its highest scale Touch one lead to the compressor body clean point of contact as a good connection is a must and the other probe in turn to each compressor terminal See Figure 3 If a reading is obtained the compressor is grounded and must be replaced FIGURE 3 TYPICAL GROUND TEST FAN MOTOR Figure 4 A 230 volt single phase permanent split capacitor motor is used to drive the evaporator blower and condenser fan A running capacitor is wired across the start and run terminals of the motor The moto
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5. process tube The valve responds to suction pressure which when reduced in the system causes the valve to open and bypass hot gas from the high pressure side to the low pressure side of the system The hot gas entering the compressor mixes with the cool gas returned through the suction line thus increasing the suction pressure The valve is preset to open when the suction pressure reaches 50 psig This pressure setting cannot be altered The system can be operated at outdoor temperatures as low as 45 F before the evaporator will begin to accumulate frost To determine if the valve operates block the return air to the evaporator coil Turn on the unit and touch the tube at the bypass valve outlet which connects to the suction process tube When the low side pressure reaches approximately 50 psig the valve will begin to open and the tube will get hot This method will determine if the valve is responding to the suction pressure change FIGURE 9 LOW AMBIENT Bypass VALVE 608 095 00 SEALED REFRIGERATION SYSTEM REPAIRS EQUIPMENT REQUIRED 1 Voltmeter Ammeter 2 3 Ohmmeter 4 E P A Approved Refrigerant Recovery System 5 Vacuum Pump capable of 200 microns or less vacuum 9 Acetylene Welder 7 Electronic Halogen Leak Detector G E Type H 6 or equivalent 8 Accurate refrigerant charge measuring device such as a Balance Scales 1 2 oz accuracy b Charging Board 1 2 oz accuracy
6. 9 High Pressure Gauge 0 400 Ibs 10 Low Pressure Gauge 30 150 165 11 Vacuum Gauge 0 1000 microns EQUIPMENT MUST BE CAPABLE OF 1 Recovering 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 the high side of the system 4 Accurately weighing the refrigerant charge actually introduced into the system 5 Facilities for flowing nitrogen through the refrigeration tubing during all brazing processes The following procedure applies when replacing components in the sealed refrigeration circuit or repairing refrigerant leaks 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 the gauge from the process tube to EPA approved gauges from the process tube to the EPA approved recovery system Recover the CFC s in the system to at least 5 2 Cut the process tube below the pinch off in the suction side of the compressor 3 Connect the line from the nitrogen tank to the suction process tube 4 Driftdry nitrogen through the system and unsolder the more distant connection first Filter drier high side process tube etc 5 Replace the inoperative component and always install a new filt
7. E OF COMPRESSOR MOTOR BURNOUT T 2 Recover refrigerant and oil from the system Remove the compressor capillary tube and filter drier from the system Flush the evaporator condenser and all connecting tubing with dry nitrogen or equivalent to remove all contamination from the system Inspect the suction and discharge lines for carbon deposits Remove and clean if necessary Reassemble the system including a new drier strainer and capillary tube Proceed with processing as outlined under hermetic component replacement ROTARY COMPRESSOR SPECIAL TROUBLESHOOTING AND SERVICE Basically troubleshooting and servicing rotary com pressors is the same as on the reciprocating compres sor with only a few exceptions 1 10 Because of the spinning motion of the rotary the mounts are critical If vibration is present check the mounts carefully 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 the correct connections REFRIGERANT CHARGE 1 The refrigerant charge is extremely critical Measure the charge carefully and as exactly as possible to the nameplate charge The correct method for charging the rotary is to introduce liquid refrigerant into the high side of the system with the unit off Then startthe compressor and enter the balance of the charge gas only into the lo
8. age draw against nameplate If not properly conclusive make pressure test TROUBLESHOOTING Continued PROBLEM POSSIBLE CAUSE TO CORRECT Check by substituting a known good capacitor of the Fan capacitor open same rating FAN MOTOR DOES NOT RUN Rotate by hand add oil if noisy replace Bound fan blade or blower wheel Adjust for proper clearance ___ O SWITCH DOES NOT Selector Switch Relay Replace selector switch Replace relay FAN MOTOR OFF A RI Poor installation Refer to Installation Instructions for proper installation Fan blade striking chassis Adjust motor mount to attain proper fan blade and blower wheel clearance NOISY AND OR Compresor brain Check for deteriorated compressor grommets or VIBRATION 9 missing mounting parts Loose cabinet parts improperly mounted components tubing Adjust and tighten as required rubbing en noel EXaporator drain pan Clean obstructed drain trough overflowing WATER LEAKS Condensation forming on bottom Evaporator drain pan broken or cracked Reseal or INTO ROOM of base pan replace Water dripping from discharge Dirty evaporator coil or extremely high humidity air grilles conditions Clean coil with steam or detergent Evaporator drain pan cracked or obstructed Repair and clean or replace as required Remove condenser shroud Clean and remove old sealer from base pan and shroud Apply new sealer reinstall and check Dirty Co
9. er drier Drift dry nitrogen through the system when making these connections 6 Pressurize the system to 30 PSIG with proper refrigerant and boost the refrigerant pressure to 150 PSIG with dry nitrogen 7T Leak test the complete system with the electric halogen leak detector correcting any leaks found 8 Reduce the system to zero gauge pressure 9 Connect the vacuum pump to the high side and low side of the system with deep vacuum hoses or copper tubing Do not use regular hoses 10 Evacuate the system to an absolute holding pressure of 200 microns or less 11 12 NOTE This procedure can sped up by the 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 the sys tem a minimum of 10 minutes Recover refriger ant and proceed with evacuation to a pressure of 200 microns or a minimum of 1096 Break the vacuum by charging the 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 small increments while operating the unit Restart the unit several times after allowing pressures to stabilize Pinch off the process tubes cut and solder the ends Remove the pinch off tool and leak check the process tube ends SPECIAL PROCEDURES IN THE CAS
10. ially iced coil Check split across coil OFF Check for low running amperage Thermostat contacts St ck Check operation of thermostat Replace if contacts remain closed Loss of charge in thermostat Place jumper across thermostat terminals If unit bulb operates replace thermostat THERMOSTAT DOES Loose or broken parts in above NOT TURN UNIT ON thermostat Connect per wiring diagram System switch open Test for continuity at switch terminals 2 and 3 mm TIT Thermostat set at coldest Turn to highest temperature setting to see of unit will cycle point off THERMOSTAT DOES Thermostat contacte st ck Disconnect power to the unit Remove cover of thermostat NOT TURN UNIT OFF check if contact is stuck if so replace thermostat Test switch for open contacts at terminals 2 and 3 with 0 svvitch in Off position 11 TROUBLESHOOTING Continued PROBLEM POSSIBLE CAUSE TO CORRECT COMPRESSOR ATTEMPTS TO START OR RUNS FOR SHORT PERIODS ONLY CYCLES ON OVERLOAD COMPRESSOR DOES NOT START FAN MOTOR RUNS Compressor attempts to start before system pressures are equalized Allow a minimum of two 2 minutes to allow pressures to equalize before attempting to start Check voltage with unit operating Check for other Low or fluctuating voltage appliances on the circuit Unit should be on separate circuit for proper voltage and be fused separately Incorrect wiring Connect per wiri
11. icates contacts closed when lit SYSTEM CONTROL SWITCH Figure 6 This switch is double pole single throw Check for continuity between terminals 2 and 3 and 5 and 6 FIGURE 6 SWITCH ON OFF CAPACITOR RUN A run capacitor is wired across the auxiliary and main winding of a single phase permanent split capacitor motor such as the compressor and fan motors 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 The line side of the capacitor is marked with a red dot and is wired to the line side of the circuit see Figure 7 FIGURE 7 RUN CAPACITOR HOOK UP COMPRESSOR RUN CAPACITOR CAPACITOR TEST 1 Remove the capacitor from the unit 2 Check for visual damage such as bulges cracks or leaks 3 Fordualrated capacitors apply an ohmmeter lead to the common C terminal and the other probe to the compressor HERM terminal A satisfactory capacitor will cause a deflection on the pointer 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 the fan m
12. ndenser coil Clean with steam or detergent Fan blade and Slinger 109 Adjust fan blade to 1 2 clearance from condenser coil improperly positioned Water in center section of base OUTSIDE WATER pan compressor area LEAKS 14 WIRING DIAGRAM MODELS SH15L30 A SH20L30 A SH20L50 A WIRING DIAGRAM COMPRESSOR CAPACITOR gt AC Es SYSTEM SWITCH TOGGLE COMPRESSOR 5 s pack WHITE P is HARNESS 2 5 BLACK TO GROUNDING SCREW GREEN TO CHASSIS TO CONTROL ASY GROUNDING SCREW SOLID STATE RELAY CAPACITOR COMPRESSOR TERMINAL ADAPTER FAN MOTOR GROUND LEAD OVERLOAD PROTECTOR COMBINATION TERMINAL SYSTEM SWITCH INDOOR THERMOSTAT PART NO REV 619 405 08 HAZARDGARD CHASSIS PARTS HAZARDGARD PARTS LIST DESCRIPTION PART MODELS lt ELECTRICAL PARTS COMPRESSOR _ me COMPRESSOR W i 7 7 HARNESS WIRE COMP DESCRIPTION PART NO MODELS REFRIGERATION PARTS VALVE BY PASS 1 1 1 gt aj aj G p a olololo m TL m dl gt 10 10 HERE Za REF 55 EE EH 1 1 1 1 7 Tl idit il 57 gt 17 HAZARDGARD PARTS LIST DESCRIPTION PART CHASSIS PARTS SHROUD CONDENSER 61803601
13. ng diagram Shorted or incorrect capacitor 5 by substituting known good capacitor of correct Restricted or low air flow through condenser coil Compressor running abnormally Check for kinked discharge line or restricted condenser hot Check amperage Change compressor if all other corrections above are Overload opens too soon cima Check for proper fan speed or blocked condenser Check continuity of thermostat at coldest setting Jump contacts if compressor runs replace thermostat Low voltage supply Check for nameplate voltage Thermostat contacts closing Switch On Off inoperative Test for continuity Open capacitor by substituting a knovvn good capacitor of correct Check voltage at compressor terminals If voltage is satisfactory replace compressor Relay open Replace relay Open or shorted compressor Check windings for continuity and resistance Direct test windings compressor If direct test fails replace compressor Internal overload open 12 DOES NOT COOL OR COOLS ONLY SLIGHTLY Set to coldest position Test thermostat and replace if Thermostat open or inoperative necessary Dirty air filter Clean as recommended in Owner s Manual Dirty OF plugged 1 Use steam detergents to clean evaporator coil Poor air circulation in area being Adjust air louvers cooled Low capacity undercharge Clean check for leak and make repair Compressor not pumping Check amper
14. otor capacitor NOTE A shorted capacitor will indicate a low resistance and the pointer will move more to the O 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 THERMOSTAT A cross ambient thermostat is used to maintain the desired comfort level The thermostat reacts only to a change in temperature at the bulb location Important to the successful operation of the unit is the position of the sensing bulb in relation to the evaporator see Figure 8 FIGURE 8 SENSING BULB LOCATION RANGE Thermostat Part No 618 225 02 60 F 27 to 90 F 4 Remove the wires from the thermostat Turn the thermostat to its coldest position Check to see if there is continuity between the two terminals Turn the thermostat to its warmest position Check continuity to see if the thermostat contacts open Note The temperature must be within the range listed to check the thermostat Refer to the troubleshooting section in this manual for additional information on thermostat testing LOW AMBIENT BYPASS VALVE Figure 9 The HazardGard unit is designed to operate at low outside ambient temperatures This is accomplished by the use of a bypass valve installed in the refrigeration circuit The valve is connected between the discharge line at the compressor and the suction
15. ris totally enclosed and is protected with a line voltage overload located internally of the motor The motor shaft is stainless steel to resist corrosion FIGURE 4 FAN MOTOR CHECKING 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 Install a piercing valve on the suction and discharge or liquid process tube Attach gages to the high and low sides of the system Start the system and run a cooling or heating performance test If test shows Below normal high side pressure Above normal low side pressure Low temperature difference across the coil The compressor valves are faulty replace the compressor FAN MOTOR TEST Disconnect power to the unit 1 Determine that the capacitor is serviceable 2 Disconnect the black lead from the circuit board 3 Apply live test cord leads to the common terminal of the capacitor and the black lead The motor should run at high speed SOLID STATE RELAY Figure 5 Two 50 amp rated 208 230 volt solid state relays are used to energize the compressor and fan motor Terminals 3 and 4 are the 208 230 volt line side Terminals 1 and 2 are load side contacts FIGURE 5 SOLID STATE RELAY a Line side ec ari gt x6 pe Load side LED ind
16. rriedrich Service amp Parts Manual 2005 mazardgard Room Air Conditioners 50 60 Hz Models SH15L30 A SH20L30 A SH20L50 A HG SVC PRTS 05 4 05 TABLE OF 5 PAGE ad 3 Performance erect EPOR Ee us v tt 3 Component Operation amp mmn 4 Compressors nue MAS 4 Thermal Overload 4 a 5 aaa 5 Solid Stale Relay zs lectae sedo res Ln 5 System Control Switch c 6 RUN Capacitor RN 6 OR 6 Low Ambient Bypass Vale cune aana a R 8 Sealed Refrigeration System Repairs 11 da 8 Hermetic Component Replacement 9 Special Procedure in the case of Compressor Motor Burn Out 9 Rotary Compressor Special Troubleshooting amp Service 10 Refrigerant aan 10 TrOUbIEShOOtNg Em 11 13
17. w 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 All inoperative compressors returned to Friedrich must have all lines properly plugged with the plugs from the replacement compressor TROUBLESHOOTING PROBLEM POSSIBLE CAUSE TO CORRECT System Oe Set switch correctly position Replace fuse reset breaker If repeats check fuse or breaker size Check for shorts in unit wiring and components Branch circuit fuse blown or UNIT DOES NOT RUN Circuit breaker tripped Inoperative system switch Test for continuity Loose or disconnected wiring Check wiring and connections at switch Connect per wiring diagram Inoperative switch On Off Test for continuity 3 and 2 5 and 6 eee Diny Fiter EVAPORATOR COIL FREEZES UP De ice coil Check temperature differential across coil Partially restricted capillary Touch test coil return bends for same temperature Test low running current Inoperative fan motor Test and replace if inoperative gt ees SS Excessive heat load Test cooling performance of unit Unit undersized Restriction in li Check for partially iced coil Check temperature split COMPRESSOR RUNS siriction in line across coil CONTINUALLY Check for presence of oil on silver soldered connections DOES NOT CYCLE Refrigerant leak Check for part
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