Page 2 - FEATURES; Models; NEW MATERIALS FOR BETTER OIL RESISTANCE; Indoor unit
OC278-2 1 FEATURES Models Cooling capacity SEER PC24GK 25,000 Btu/h 10.4 PC30GK 31,000 Btu/h 10.0 PC36GK 36,500 Btu/h 10.3 PC42GK 42,500 Btu/h 10.8 MicroprocessorRemote controller FILTER CHECK MODE TEST RUN TIMER OFF TIMER CHECK SET TEMP. CLOCK AUTO AUTO START STOP SWING FANSPEED AUTORETURN 1. AIR O...
Page 3 - Removed the knockout work by separating the piping; EASY MAINTENANCE NO MAINTENANCE NECESSARY FOR 2500 HOURS
OC278-3 7. STABLE COOLING EVEN AT OUTDOOR TEMPERATURES AS LOW AS 23˚F MAKES YEAR-ROUND AIR-CONDITIONING POSSIBLE The microprocessor automatically adjusts fan speed in accordance with outdoor temperature to maintain the coolant at aneven condensing temperature. The result is smooth, efficient cooling...
Page 4 - PART NAMES AND FUNCTIONS
OC278-4 2 PART NAMES AND FUNCTIONS ● Indoor (Main) Unit Air outlet Intake grille Air intake Left/right guide vanes Change the direction of airflowfrom the horizontal blower. Long-life fillter Removes dust and foreigh matter from air coming inthrough the grille (Recommended cleaning interval :Approx,...
Page 5 - Remote controller operation buttons; FILTER button; Remote controller
OC278-5 Remote controller operation buttons TIMER OFF TIMER CHECK SET TEMP. DRY COOL FAN CLOCK AUTO AUTO START STOP MODE TIMER ON/OFF CLOCK/TIMER FAN SPEED AIR DISCHARGE FILTER CHECK TEST RUN AIR SWEEP SET TEMP. TIMER SET F FANSPEED REMOTE CONTROLLER FILTER button This resets the filter service indi...
Page 6 - Caution; Remote controller display
OC278-6 TIMER OFF TIMER CHECK SET TEMP. DRY COOL FAN CLOCK AUTO AUTO START STOP MODE TIMER ON/OFF CLOCK/TIMER FAN SPEED AIR DISCHARGE FILTER CHECK TEST RUN AIR SWEEP SET TEMP. TIMER SET F FANSPEED REMOTE CONTROLLER Operation lamp This lamp lights during operation,goes off when the unit stops andflas...
Page 7 - SPECIFICATIONS
OC278-7 SPECIFICATIONS 3 Capacity Power consumption EER SEER INDOOR UNIT MODEL External finish Power supply Max. fuse size (time delay) Min ampacity Fan motor Airflow Hi-Lo Moisture removal Sound level Hi-Lo Unit drain pipe OD. (On a local side) Dimensions Weight OUTDOOR UNIT MODEL External finish P...
Page 8 - DATA
OC278-8 4 DATA Models Models Outdoor intake air DB temperature(˚F) PC24GK 71 67 63 62.5 60 59 71 67 63 62.5 60 59 71 67 63 62.5 60 59 71 67 63 62.5 60 59 TC 29.7 27.9 26.1 25.9 24.8 24.4 36.9 34.6 32.4 32.1 30.8 30.3 43.4 40.7 38.1 37.7 36.3 35.6 50.5 47.4 44.4 43.9 42.2 41.5 SHC 19.7 22.3 24.3 21.8...
Page 9 - NOTES : A point on the curve shows the reference point.; PC24GK COOLING CAPACITY
OC278-9 T otal power consumption (kW) T otal capacity (x10 3 Btu/h) Outdoor intake air D.B. temperature ( ˚ F) 48 42 36 30 5.0 4.5 4.0 3.0 3.5 2.5 63 67 71 63 67 71 SHF=0.78 23 45 65(67) 32 35 55 75 85 95 105 115 Indoor intake air W.B. temperature (˚F) Indoor intake air W.B. temperature (˚F) T otal ...
Page 10 - CONDENSING PRESSURE AND SUCTION PRESSURE
OC278-10 3. CONDENSING PRESSURE AND SUCTION PRESSURE Data is based on the condition under indoor humidity 50%.Air flow should be set at HI.A point on the curve shows the reference point. < Cooling mode> 350340330320310300290280270260250240230220210200190180170160150 (psi.G) Condensing pressure...
Page 12 - STANDARD OPERATION DATA; Electrical circuit
OC278-12 4. STANDARD OPERATION DATA Models Item Electrical circuit Refrigerant circuit Indoor side Outdoor side Voltage Frequency Total input Indoor fan current Outdoor fan current Comp. current Condensing pressure Suction pressure Discharge temperature Condensing temperature Suction temperature Com...
Page 13 - OUTLET AIR SPEED AND COVERAGE RANGE
OC278-13 5. OPERATING RANGE 1) POWER SUPPLY 2) OPERATION Indoor unit Outdoor unit Rating 115V 1 phase 60Hz 208/230V 1 phase 60Hz Allowable voltage Min. 103V — Max. 127V Min. 198V — Max. 253V Function Cooling DB (˚F) 80 95 67 80 Condition Standard temperature Maximum temperature Minimum temperature M...
Page 14 - NOISE CRITERION CURVES; Lo; Lo
OC278-14 8. NOISE CRITERION CURVES 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATETHRESHOLD OFHEARING FORCONTINUOUSNOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCT A VE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR BAND CENTER FREQUENCIES, Hz PC24GK Hi Lo NOTCH 4842 SPL(db...
Page 15 - OUTLINES AND DIMENSIONS
OC278-15 OUTLINES AND DIMENSIONS 5 Indoor UnitPC24GK Unit : inch Knock out hole for upper drain pipe arrangement 9 8 8 Knock out hole for fresh air intake 9 51-9/16 10-5/8 or more 11-13/16 or more 1/16 Less than 9-7/8 19-11/16 or more Less than 26-3/4 7-3/16 7-13/16 9-5/8 8-9/16 5/8 3-7/16 3-1/8 12-...
Page 17 - COOLING; REFRIGERANT SYSTEM DIAGRAM
OC278-17 Unit : inch Remote controller FILTER CHECK MODE TEST RUN TIMER OFF TIMER CHECK SET TEMP. CLOCK AUTO AUTO START STOP SWING FANSPEED 5-1/8 4-3/4 3/4 3/32 23/32 AUTO RETURN Pipe temperaturethermistor / Liquid(RT2) Distributor Refrigerant pipe(option) { 3/8" (with heat insulator) Refrigeran...
Page 18 - WIRING DIAGRAM
OC278-18 7 WIRING DIAGRAM MODELS PC24/30/36/42GK WIRING DIAGRAM 1 2 TB3 OUTDOOR UNIT TRANSMISSION WIRESDC12V ZNR (1)Set the dip switch (SW3<I.B>) on the indoor controller board to 1 on and 2 off for cooling. (2)Turn on outdoor unit side circuit breaker,then indoor unit side circuit breaker.(3)...
Page 19 - MAIN OPERATION
OC278-19 OPERATION FLOW-CHART 8 START Power circuit breaker Check SW ON twice Operation SW ON “OFF” timer “ON” timer STOP Set time complete Set time complete 1 NO NO NO NO NO NO NO NO NO YES YES YES YES YES YES YES YES YES YES w 1 w 2 w 3 w 4 w 5 PROTECTION DEVICE SELF HOLD RELEASE Remote controller...
Page 20 - COOLING OPERATION; during auto vane SWING, the auto vane will continue to swing.
OC278-20 COOLING OPERATION COOL operation Initial COOLING NO NO NO NO NO YES YES YES YES YES YES NO YES YES YES YES YES YES YES YES YES YES YES NO NO NO NO YES NO NO NO NO NO NO NO NO NO w 8 w 9 Vane initial setting Vane 55 deg downward angle 70 deg downward angle Fan speed LOW Downward discharge 1 ...
Page 21 - DRY OPERATION; It is not possible to set the fan speed with the remote controller
OC278-21 DRY OPERATION w 8—9 Refer to page OC278-20. w 12 When room temperature is 64°F or below, the compressor cannot operate.When room temperature rises over 64°F the compressor starts after a 3-minute time delay. w 13 Compressor ON time is decided by room temperature. Refer to page OC278-28. w 1...
Page 22 - MICROPROCESSOR CONTROL; OUTLINE OF MICROPROCESSOR CONTROL; OUTPUT to outdoor unit
OC278-22 9 MICROPROCESSOR CONTROL ● Compressor and outdoor fan : ON-OFF 1.OUTLINE OF MICROPROCESSOR CONTROL ● OFF-ON switching. ● COOL/DRY-FAN selector switching. ● Thermostat setting. ● TIMER mode selector-switching and Timer setting. ● HIGH-LOW fan speed switching. ● Swing louver (AIR SWEEP) switc...
Page 23 - INDOOR UNIT CONTROL; Coil frost prevention; NOTE: Set temperature changes 2°F when the SET TEMP. button
OC278-23 2. INDOOR UNIT CONTROL 2-1 COOL operation (1) Compressor control 1 3-minute time delay To prevent overload, the compressor will not start within 3 minutes after stop. 2 The compressor runs when room temperature is higher than set temperature. The compressor stops when room temperature is eq...
Page 26 - (4) Detecting abnormalities in the outdoor unit; RANGE A
OC278-26 (4) Detecting abnormalities in the outdoor unit After the compressor has been continuously operated for 3 minutes, if the difference between the indoor coil temperatureand room temperature is out of RANGE C for 1 minute, the indoor fan speed will turn to LOW. Five minutes later, if the dif-...
Page 27 - NOTE: The set temperature changes 2°F when the SET TEMP.
OC278-27 <DRY operation time chart> Minimum 3 minutes w 1 ON Thermostat Indoor fan Auto vane Compressor ON DRY MODE DRY MODE ON OFF OFF ON OFF OFF Operation starts byP O W E R b u t t o nON. Operation stops byP O W E R b u t t o nOFF. Room temperaturebecomes equal toset temperature. Room tempe...
Page 29 - -3 Auto vane control; Horizontal
OC278-29 <How to operate>To change the air flow direction, press AIR DISCHARGE button. COOL/DRY operation At the start-up of COOL or DRY operation, the airflow direction in automatically set to horizontal. After, it can be changedto another direction with AIR DISCHARGE button on the remote con...
Page 31 - -6 Emergency operation
OC278-31 (1) Indoor coil temperature code During the test run, the indoor coil temperature code from 1 to 15 is displayed on the remote controller instead of roomtemperature. The code should fall with the lapse of time in normal COOL operation. (2) Trouble during test run ● If the unit malfunctions ...
Page 32 - -7 Dip switch functions; Each figure shows the initial factory setting.
OC278-32 (2) SW2 (Address selector) 1 2 3 4 5 6 ONOFF Used in setting the unit-address for group control.For further information,refer to page OC278-41. 2-7 Dip switch functions Each figure shows the initial factory setting. 1. On remote controller board(1) SW17(Address selector) SW17-1~6) For addre...
Page 33 - Model; Fan motor max. rotational frequency; Voltage
OC278-33 (3) SW3 (Emergency operation switch) 1 2 Normal operation ONOFF 1 2 For emergency cooling ONOFF (4) SW5 (Model selector) 1 2 3 4 ONOFF SW5-1) Not for use.SW5-2) Leave this switch as it is.SW5-3) Not for use.SW5-4) Not for use. (5) SW6 (Address selector) 1 2 3 4 ONOFF (6) SW7 (Model selector...
Page 34 - TROUBLE SHOOTING; ) Timer adapter is connected to the; TROUBLES IN TEST RUN
OC278-34 10 TROUBLE SHOOTING The display “CENTRALLYCONTROLLED” on remotecontroller does not disap-pear. 1) Wrong address setting of remote con- troller/indoor controller board. 2) Timer adapter is connected to the remote controller. 3) Signal transmission error between indoor unit and remote control...
Page 35 - Check button
OC278-35 2-2 How to use the self diagnostic function for service A. For normal control with one unit and one remote controller (1) Pressing the CHECK button on the remote controller twice starts the self diagnostic function. (2) During the self diagnostic function, “CHECK MODE” appears at two positi...
Page 37 - WRONG WIRING ON SITE; Symptom due to wrong wiring between indoor and outdoor units
OC278-37 3. WRONG WIRING ON SITE Symptom due to wrong wiring between indoor and outdoor units Wrong wiring Thermostat Phenomena Outdoor unit Indoor unit 1 2 1 2 OFF The outdoor unit stops. ON Operation stops. 9 minutes later, the check code ¨P8¨ appearson the remote controller display. OFF Operation...
Page 38 - OTHER TROUBLES AND CAUSES; “CENTRALLY CONTROLLED” is displayed.
OC278-38 Vanes do not work. Vane motor does not work.Connector is poorly connected.Vane motor is poorly assembled.Indoor controller board is damaged. Unit stops after 5 to20 seconds operation Protection function is working. Air discharge displayis OFF and AIR DIS-CHARGE button doesnot operate. Indoo...
Page 39 - How to check the parts; Thermistor R
OC278-39 5. How to check the parts Parts name Check points Disconnect the connector then measure the resistance using a tester.(Ambient temperature 50 ° F to 86 ° F) Measure the resistance between the terminals using a tester.(Ambient temperature 77 ° F) Vane motor (MV) (Refer to the thermistor) Roo...
Page 40 - SYSTEM CONTROL; VARIETY OF SYSTEM CONTROL FUNCTIONS
OC278-40 11 SYSTEM CONTROL 1 Group control with a single remotecontroller(See page OC278-41. Unit Remote controldisplay board Remotecontroller Unit Unit Two remote controllers can be used to control either oneunit or a group of units. Units can then be controlled froma distance or at close range. Un...
Page 41 - GROUP CONTROL WITH A SINGLE REMOTE CONTROLLER; Figure 2; Figure 1
OC278-41 2. GROUP CONTROL WITH A SINGLE REMOTE CONTROLLER A maximum of 50 units can be started in order according to the dip switch settings 2-1 How to wire (1) Connect the remote controller to the double terminal block on the indoor controller board of the master unit (No.0 unit).(See Figure 1.) (2...
Page 42 - CONTROL USING TWO REMOTE CONTROLLERS; -2 Remote controller LCD indication; (1) The same indications always appear on both the; REMOTE ON-OFF AND INDIVIDUAL REMOTE CONTROLS; Figure 4; Figure 5; Figure 6
OC278-42 3. CONTROL USING TWO REMOTE CONTROLLERS Two remote controllers can be used to control either one unit or a group of units. Units operate according to the latest com-mand from either of the two remote controllers.Before operation, be sure to set one remote controller as the “main controller”...
Page 43 - -3 Switch function of remote ON-OFF switch
OC278-43 NOTE1 : Install the relay box where you can be serviced it easily.NOTE2 : For control circuit wiring, use a wire of No. 14 AWG or a control cable according to the power supply of control circuit. NOTE3 : When the power supply of the control circuit is 115V AC, ● Do not connect the control c...
Page 44 - MULTIPLE REMOTE CONTROL DISPLAY; How to wire; indoor controller board.; AUTO RESTART FUNCTION; Indoor controller board; TIMER OPERATION OR THE OPERATION BY AN EXTERNAL SIGNAL
OC278-44 6. MULTIPLE REMOTE CONTROL DISPLAY You can control several units with a multiple remote control display, bywiring an optional multiple display adapter (PAC-SA88HA-E) with relaysand lamps on the market. How to wire (1) Connect the multiple display adapter to the connector CN51 on the indoor ...
Page 45 - DISASSEMBLY PROCEDURE; Removing the air intake grille; backward to open the intake grille.; OPERATING PROCEDURE; Removing the electrical box; remove the electrical cover.
OC278-45 DISASSEMBLY PROCEDURE 12 1. Removing the air intake grille (1) Slide the intake grille holding knobs (at two locations) backward to open the intake grille. (2) When the intake grille left open, push the stoppers on the rear hinges (at two locations) to pull out the intake grille. OPERATING ...
Page 46 - Figure 3; Removing the fan motor; upper side of the casing.; Removing the side panel; side panel by sliding the panel to the front.; Photo 2
OC278-46 Figure 3 OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS 3. Removing the fan motor (1) Remove the intake grille.(2) Disconnect the fan motor connector.(3) Remove the screw for removing the motor support at both left and right side. (4) Loosen the set screws at the fan motor side of the con- ne...
Page 47 - Removing the vane motor; Photo 4
OC278-47 OPERATING PROCEDURE PHOTOS 6. Removing the vane motor (1) Remove the air intake grille.(2) Remove the left side panel.(3) Remove the relay connector of vane motor.(4) Remove the electrical box.(5) Remove the screws of vane motor, then remove vane motor. (Note) Connect the lead wires and con...
Page 48 - Removing the drain pan; and left side drain pan.; Removing the guide vane; Photo 8
OC278-48 OPERATING PROCEDURE PHOTOS 9. Removing the drain pan (1) Remove the air intake grille.(2) Remove the beam.(3) Remove the side panel (right and left).(4) Remove the under panel. Remove the screws of the right and left side drain pan. (5) Remove the insulation in center of the drain pan, and ...
Page 50 - PARTS LIST
OC278-50 13 PARTS LIST STRUCTURAL PARTPC24GK 22 21 20 19 18 17 15 14 13 12 16 11 10 9 8 7 6 4 3 2 1 5 OC278(192)--2.qxp 01/12/14 1:36 PM Page 50
Page 51 - Part numbers that are circled are not shown in the illustration.
OC278-51 No. Parts No. Parts Name Specifications PC 24GK Wiring Diagram Symbol Recom- mended Q'ty Unit Amount Q'ty / set Price LEFT SIDE PANEL LEFT LEG SIDE PLATE-L. REAR PANEL GRILLE HINGE GRILLE CATCH GRILLE ASSY FILTER UNDER PANEL WIRELESS BOARD CASE SIDE PLATE-R. RIGHT SIDE PANEL RIGHT LEG SERVI...
Page 57 - OPTIONAL PARTS; -1 Program timer specifications
OC278-57 OPTIONAL PARTS 14 1-2 Feature of program timer(1) Daily timer function Daily timer can be set in 30 minutes units for up to 24 hours.Each unit can be set for unit ON, unit OFF, or setback operation. (2) Setback operation (PAC-SC32PTA) Set back operation is useful for reducing running costse...
Page 58 - -4 Names and functions
OC278-58 1-4 Names and functions <PAC-SC32PTA> WEEKLY TIMER SETTING DISPLAY Sets timer for a week. SET/MONITOR SET S M T W T F S MONITOR PROGRAM TIMER PAC-SC32PTA TODAY ON WEEKLY SETTING OFF ON SET BACK OFF CLOCK DAILY TIMER SET BACK SET BACK DAILY SETTING 12 15 18 21 24 0 3 6 12 15 CURRENT TI...
Page 59 - MULTIPLE REMOTE CONTROLLER ADAPTER
OC278-59 Note 1. The refrigerant pipes and the indoor unit contain a nitrogen holding charge which must be removed by evacuation. <Piping connection procedures>See that ball valve on outdoor unit is fully shut (unit is shipped with valve shut). Remove caps from piping and unit andmake flare co...
Page 60 - 400 Lawrenceville Suwanee Road; Specifications are subject to change without notice.
3400 Lawrenceville Suwanee Road ● Suwanee, Georgia 30024 Toll Free: 800-433-4822 ● Toll Free Fax: 800-889-9904 www.mrslim.com Specifications are subject to change without notice.
