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Friedrich KM21J30 - page 1
Page 1 Ser vice & P ar ts Man ual AMERICA’S BEST AIR CONDITIONER 1998 QuietMaster ® J Series KS10J10 KS12J10 KS12J30A KM18J30A KM21J30 KL25J30 RA C-K (1/98) ...
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Page 2 T ABLE OF CONTENTS PA G E GENERAL F riedrich Room Model Number Code ............................................................................................... ........ 3 Application and Sizing ......................................................................................................... ..................... 4 Instructions f ...
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Friedrich KM21J30 - page 3
Page 3 FRIEDRICH R OOM MODEL NUMBER CODE K S 10 G 1 0 D 1st DIGIT - FUNCTION S = Straight Cool, V alue Ser ies C = Straight Cool, Budget Series Y = Heat Pump E = Electric Str ip K = Straight Cool, Challenger or QuietMaster Series W = Thru-The-W all, WallMaster Series 2nd DIGIT - TYPE C = Casement P = P owerMiser “P ortable” Q = QStar , KStar or ...
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Friedrich KM21J30 - page 4
Page 4 APPLICA TION AND SIZING In the application and sizing of room air conditioners f or cooling, it is most impor tant to giv e full consideration to all f actors which may contrib ute to the heat loss or gain of the space to be conditioned. It is theref ore necessar y to make a sur v e y of the space to be conditioned and calculate the load req ...
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Friedrich KM21J30 - page 5
Page 5 INSTR UCTIONS FOR USING COOLING LO AD ESTIMA TE FORM FOR ROOM AIR CONDITIONERS (AHAM PUB. NO . RA C-1) A. This cooling load estimate f or m is suitable f or estimating the cooling load f or comfort air conditioning installations which do not require specific conditions of inside temperature and humidity . B . The f or m is based on an outsid ...
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Page 6 COOLING LO AD ESTIMA TE FORM ...
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Page 7 SPECIFICA TIONS KS10J10 KS12J10 KS12J30A KM18J30A KM21J30 KL25J30A BTUH 12500 18000 21000 25000 10000 12000 12500 18000 20500 24700 E.E.R. 10.0 9.6 9.0 8.3 10.3 9.5 10.0 9.6 9.0 8.2 V olts 230 230 230 230 115 115 208 208 208 208 Amperes 5.8 8.3 10.5 13.5 9.1 10.8 6.2 9.1 11.3 15.0 T otal W atts 1250 1875 2335 3010 970 1265 1250 1875 2280 301 ...
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Friedrich KM21J30 - page 8
Page 8 COMPONENTS OPERA TION & TESTING W ARNING DISCONNECT ELECTRICAL PO WER T O UNIT BEFORE SER VICING OR TESTING COMPRESSORS Compressors are single phase, 15 or 230/208 v olt, de- pending on the model unit. All compressor motors are per manent split capacitor type using only a running ca- pacitor across the star t and r un ter minal. All comp ...
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Friedrich KM21J30 - page 9
Page 9 The ov erload is wired in ser ies with the common motor ter minal. The ov erload 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 ter minal. Figure 3: External Overload Heat generated within the compressor shell is usually du ...
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Friedrich KM21J30 - page 10
Page 10 Figure 5: F an Motor 5. Apply “live” test cord probes on each of the re- maining wires from the speed s witch or system s witch to test intermediate speeds. CAP A CIT OR, R UN A run capacitor is wired across the auxiliar y and main winding of a single phase per manent split capacitor motor such as the compressor and f an motor . A singl ...
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Friedrich KM21J30 - page 11
Page 11 Figure 7: System Control P anel THERMOST A T (Figure 9) A cross ambient ther mostat is used on all standard chas- sis units. In addition to cycling the unit in a heating or cooling operation, the thermostat will ter minate the cool- ing cycle in the e vent ice f or ms on the ev aporator coil, in this case the ther mostat functions as a de-i ...
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Friedrich KM21J30 - page 12
Page 12 RESIST OR (Heat Anticipator) F ailure of the resistor will cause prolonged “off ” and “on” cycles of the unit. When replacing a resistor , be sure and use the e xact replacement. Resistor ratings are as f ollows: 115 V olt - 5,000 ohms 3 watt 230 V olt - 20,000 ohms 3 watt Figure 10 RESIST OR FIGURE 11 R OCKER SWITCH MONEYSA VER ® ...
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Friedrich KM21J30 - page 13
Page 13 a. Balance Scales - 1/2 oz. accuracy b . Charging Board - 1/2 oz. accuracy 9. High Pressure Gauge - (0 - 400 lbs.) 10. Low Pressure Gauge - (30 - 150 lbs .) 11. V acuum Gauge - (0 - 1000 microns) EQ UIPMENT MUST BE CAP ABLE OF: 1. Recovering CFCs as low as 5%. 2. Evacuation from both the high side and lo w side of the system simultaneously ...
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Friedrich KM21J30 - page 14
Page 14 R O T AR Y COMPRESSOR SPECIAL TROUBLESHOO TING AND SER VICE Basically , troubleshooting and servicing rotar y compres- sors is the same as on the reciprocating compressor with only a fe w exceptions. 1. Because of the spinning motion of the rotar y , the mounts are critical. If vibration is present, chec k the mounts carefully . 2. The elec ...
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Friedrich KM21J30 - page 15
Page 15 Troubleshooting Cooling PROBLEM POSSIBLE CA USE T O CORRECT Check for voltage at compressor. 1115 volt and 230 volt units will operate at 10% voltage variance. Set thermostat to coldest position. Test thermostat and replace if inoperative. Hard start compressor. Direct test compressor. If com- pressor starts, add starting components. Check ...
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Friedrich KM21J30 - page 16
Page 16 PROBLEM POSSIBLE CA USE T O CORRECT Replace fuse, reset breaker. If repeats, check fuse or breaker size. Check for shorts in unit wiring and compo- nents Plug in power cord Set switch correctly. Test for continuity in each switch position. Check wiring and connections. Reconnect per wiring diagram. Fuse blown or circuit tripped. Power cord ...
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Friedrich KM21J30 - page 17
Page 17 PROBLEM POSSIBLE CA USE T O CORRECT Compressor attempts to start, or runs for short periods only. Cycles on overload. Check operation of unit. Replace overload if system operation is satisfactory. Allow a minimum of two (2) minutes for pressures to equalize before attempting to restart. Instruct customer of waiting period. Check voltage wit ...
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Friedrich KM21J30 - page 18
Page 18 PROBLEM POSSIBLE CA USE T O CORRECT Thermostat short cycles. Thermostat differential too narrow. Plenum gasket not sealing, allowing discharge air to short cycle the thermostat. Restricted coil or dirty filter. Thermostat bulb touching thermostat bulb support bracket. Replace thermostat. Check gasket, reposition or replace. Clean and advise ...
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Friedrich KM21J30 - page 22
Page 22 * Not Shown QUIETMASTER "KS" - "KM" SERIES P AR TS LIST REF . P AR T NO . DESCRIPTION APPLICA TION KKK K K SSS M M 111 1 2 022 8 1 JJJ J J 113 3 3 000 0 0 ELECTRICAL P AR TS AA 1 615-628-09 Compressor , T ecumseh, 115 V ., 60 Hz., 1 Ph., Model RK5510E .................................. 1 1 615-628-00 Compressor , T ecums ...
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Friedrich KM21J30 - page 23
Page 23 QUIETMASTER "KS" - "KM" SERIES P AR TS LIST REF . P AR T NO . DESCRIPTION APPLICA TION KKKK K REFRIGERA TION SYSTEM COMPONENTS (Cont.) SSS M M 1111 2 0228 1 JJJJ J 1133 3 0000 0 AA 13 618-027-00 Panel Assemb ly , Left Side .......................................................................................... ... 1 1 ...
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Friedrich KM21J30 - page 24
Page 24 QUIETMASTER "KS" - "KM" SERIES P AR TS LIST REF . P AR T NO . DESCRIPTION APPLICA TION KK KKK SS S M M 11 112 02 281 JJ J JJ 11 333 00 000 AA CHASSIS P AR TS (Cont.) 34 914-004-00 Bolt, Compressor Mounting ............................................................................................... 3 3 3 3 3 35 618-102 ...
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Friedrich KM21J30 - page 27
Page 27 QUIETMASTER "KL" SERIES P AR TS LIST REF . P AR T NO . DESCRIPTION APPLICA TION K L 2 5 J 3 0 ELECTRICAL P AR TS A 1 615-935-47 Compressor , T ecumseh, 230/208 V ., 60 Hz., 1 Ph., Model A WR5524EXN ........................................ 1 2 610-714-85 Motor , F an ................................................................. ...
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Friedrich KM21J30 - page 28
Page 28 QUIETMASTER "KL" SERIES P ARTS LIST REF . P AR T NO . DESCRIPTION APPLICA TION K L 2 5 J 3 0 CHASSIS P AR TS (Cont.) A 23 606-106-02 Blower Wheel ........................................................................................................................... 1 24 618-066-00 Inner W all .................................. ...
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Friedrich KM21J30 - page 29
Page 29 Use F actor y Cer tified P ar ts . . . Printed in U.S .A. Friedrich Air Conditioning Co. 4200 Nor th P an Am Expressw ay • P .O . Bo x 1540 San Antonio , T e xas 78295-1540 • U .S.A. Phone: (210) 357-4400 F ax: (210) 357-4480 RA C-K (1/98) ...
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