SCT Series Operating and Service Manual
Contents
1. Nozzle Kit Evaporator Return air Plenum Condensate Pump Kit Cord Kit SCT 83 Several optional features are available for the SCT series portable air conditioners Refer to the Accessories section on page 16 The optional ceiling discharge kit comes complete with flexible duct and a 2 ft by 2 ft ceiling tile adapter which allows condensed air to be vented to the plenum area above a suspended ceiling Condenser discharge air can be removed from the conditioned space with flexible duct Use 40 ft maximum for all models Allow six feet for every 90 degrees bend Do not exceed 0 10 in wc water column external static pressure at the condenser The optional condenser return air plenum attaches to the rear of the unit and provides an adapter to connect flexible duct The optional supply duct adapter attaches to the evaporator air grill and allows the ability to connect a flexible duct A dual nozzle discharge air assembly optimizes the ability to direct cool air precisely where needed The flexible nozzles are attached to a mounting plate that fits over the evaporator air grille The optional evaporator return air plenum attaches to the front of the unit and provides an adapter to connect flexible duct A condensate pump automatically drains the condensate tank by removing evaporator coil water allowing continuous operation The pump is connected to the condensate drain and to the air conditioner s power supply A hose2. SCT 14 14 000 GT 115 60 1 15 Mechanical TX Valve 1 3 350 500 Hermetic rotary 0 10 40 15 65 105 IT 32 SCT 18 17 600 1 5T SCT 30 29 700 2 5T SCT 42 42 200 3 5T 115 60 1 15 230 60 1 20 230 60 1 30 Mechanical TX Valve 1 4 12 0 15 5 15P 600 1 000 Hermetic rotary 0 10 40 15 65 110 63 52 26x20x34 29x28x41 163 205 232 286 Mechanical TX Valve 2 9 12 5 20 6 20P 750 1 000 Hermetic rotary 0 10 40 15 65 105 63 54 29 x 28x 41 251 305 Mechanical TX Valve 4 2 18 3 30 6 30P 1 200 1 500 Hermetic rotary 0 10 40 15 65 105 67 80 30x 28x51 336 395 SCT 83 SCT 83B 83 500 6 9T 230 60 1 60 460 60 3 20 Mechanical TX Valve 8 7 9 3 37 8 13 2 60 20 Hard wired 2 300 3 900 Hermetic scroll 0 50 40 15 65 110 71 110 42 x 30 x 70 650 685 2 Electrical ratings based on UL 484 WARRANTY Limited Warranty Spot Cooling warrants to its authorized distributor or end user each new SCT series portable air conditioner to be free from defects in material and workmanship for a period of one 1 year from date of purchase The sole obligation of Spot Cool ing under this warranty will be to furnish without charge a replacement part for a defective part This warranty does not include installation transportation or
3. 30 42 and 96 insulation is in place Check wiring connections to freeze To adjust condenser motor sheave rotection control i Turn sheave counterclockwise 4 turns and tighten set Unit not deliver Drive belt damaged or not Check condition and adjustment of screw ing proper air adjusted correctly evaporator and condenser fan belts flow SCT 83 and sheaves Adjust belts for 3 16 in deflection Maintenance Frequency Item Maintenance Action Filters Monthly Inspect Replace wash if dirty or clogged Blower motor Monthly Inspect for buildup of dirt on blades Clean as needed Evaporator Monthly Inspect for buildup Blow with compressed condenser coil air as needed The following table shows maintenance items and frequency Condensate pump Monthly Inspect float operation Inspect for mineral deposits Clean as needed Belt SCT 960 Monthly Check tension Adjust as needed Monthly Inspect sheaves are securely fastened Tighten as needed 13 TROUBLESHOOTING GUIDE Unit does not run Power interruption Evaporator fan runs but com pressor and condenser fan do not start Check external power supply Look for blown fuses or tripped circuit breakers Reset or replace Thermostat inoperable Setting may be too high Check and reset Thermostat may be out of cali bration or defective Replace Electrical Panel 24 Volt transformer defec e Check output of transformer If not tive SCT 14 30
4. Candenaate Full Light Condensate BL Full Switch Overflow Switch Y J2 6 x AO Je z WN oT G Splice x Short Cycle High Pressure Freeze aig yall Timer 5 Min Switch Control Optianal Condensate Pump P N PC 1 J1 Jumper Plug P N 88800 165 mp 1 Tas E BK mp G Condensate Pump Co Resired when PC 1 is not installed YI ak Condensate Float Switch J1 4 p vis BL Condensate Purng 21 SCT SERIES COMPONENTS control thermostat condensate tank full light evaporator exhaust screen return air screen with filter condensate tank access door heavy duty casters front view evaporator fan condenser fan evaporator coil condenser coil condensate tank compressor side view EQUIPMENT CHECKLIST General Description General Requirements Serviceability The SCT series portable air conditioners are designed to spot cool industrial commercial institutional and construction sites Five models provide 14 000 to 83 000 BTU hr Options include discharge nozzles to direct conditioned air precisely where needed and flexible duct to transfer condenser hot air either outside or to an adjacent area The SCT series are completely self contained and housed within an insulated cabinet The unit s exterior is constructed of galvanized steel and protected with a tough powder coated polyester finish All models are equipped with standard heavy duty casters f
5. postage costs associated with installing the replacement part This warranty does not apply to equipment that has been dam aged by accident negligence or misapplication or has been altered or modified in any way This warranty only applies to the original purchaser In order for this warranty to become effective the warranty registration card delivered with the unit must be completed and returned to Spot Cooling within 30 days of purchase and delivery Any claim under this warranty should be first presented to and processed by the authorized distributor from whom the equipment was purchased To the extent permitted by law this warranty is expressly in lieu of any other warranties either expressed or implied made by Spot Cooling Incorporated Spot Cooling assumes no liability in any event for lost profits or revenue loss of equip ment loss of use of equipment loss of software loss of data costs of substitutes claims by third parties or otherwise This warranty gives you specific legal rights and you may also have other rights which may vary from state to state 22 SCHEMATIC SCT 83B 460V Phase _ 60 Hertz Field Wirin By others Plug Locations ca J Evaporator Compartment Transfarmer eae a J2 Condensate Compartment J Eynparsllor Bower condenser o BK CH HT use R BL J2 2 B Evaporator Blower Motor Fan ON OFF ALTO Switch Tronsformer Evaporator Storter Coil BL
6. 115V 1 Phase 60 Hertz C K c BL Condensate Condensate O lt J2 6 Full Light Full Switch Fan ON AUTO Switch _ TF O Ccdidenggr R O Relay RE 0 High Pressure Switch High Pressure Safety Switch Freeze Protection Control Condenser Relay RE 01 Plug Locations EN Condensate Compartment Short C yc le Protection Timer 19 evaporator condenser so fan fan high pressure switch evaporator condenser Coil coil condensate tank compressor left hand side view All models feature a manual reset high pressure switch If refrigeration circuit pressure exceeds control limits power shuts off to protect the compressor and other critical components NOTE Wait four minutes to restart unit after high pressure safety switch trips The SCT 14 30 42 and 83 models are equipped with an automatic freeze protection control This control turns the compressor off if moisture on the evaporator coil freezes and blocks the coil Normal cooling operation resumes when the temperature rises and the ice melts The SCT14 30 42 and 83 models are equipped with a short cycle protection timer The timer provides a five minute delay before the refrigerant compressor restarts Under normal conditions no adjustments are necessary STANDARD FEATURES Manual Temperature Control System Filter Condensate Tank The manual temperature control system allows you to set the
7. 42 and supplying 24 volts replace 83 Contactor coil defective e Replace Contacts stuck open burned or dirty Wires loose e Correct or change e Tighten connections Low voltage Check power supply for voltage out side the range of 106 to 126 V on 115 V units and 187 to 253 V on 208 230 V units Examine control unit for loose wires and tighten Wait four minutes before restarting Thermostat High pressure control switch Clean condenser coil filter turning unit off Clean condenser discharge screen Check for defective condenser fan motor Replace if necessary Restricted duct Short cycle timer not timed Wait 5 minutes for timer to allow com out SCT 14 30 42 and 83 pressor to restart Compressor contactor open Replace or burned Refrigerant leak no freon Locate leak and repair Evacuate unit and recharge Loose or defective wires Check for loose or shorted conductors Secure contact between wires and connectors Repair or replace as nec essary Defective compressor Check for shorts opens and grounds Compressor replacement should be done by a service technician Tank full cut out switch de Check and replace fective TROUBLESHOOTING continued continued Evaporator fan runs but com pressor and condenser fan do not start Compressor runs but fan does not run Insufficient cool ing Noisy operation Condensate tank full or red Check tank and replace red indicat
8. TD SPOTCOOLING Systems Incorporated Owner s Manual SCT Series Portable Air Conditioner a 1 SPOTCOOLING Systems INCORDORATEd 1420 Century Dr Suite 800 6116 Westline Drive Carrollton TX 75006 Houston TX 77036 Telephone 972 242 0007 Telephone 713 673 0001 1 800 683 7768 Fax 972 242 0378 THANK YOU Thank you for choosing Spot Cooling System s SCT series of portable air conditioners Spot Cooling is a solutions based manufacturer dedicated to the development of high performance air conditioners Please read This Manual which will describes the unit features and explains how to set up operate and maintain your SCT series air conditioner If you have comments or suggestions on how to improve the SCT series of portable air conditioners please let us know Our most important source of information for product improvement is from our customers Please give us a call at 972 242 0007 or email us sales extracooler com Warning Improper installation adjustment alteration service or maintenance can cause injury or property damage Please read this instruction manual before installing operating or servicing the Extracooler SCT Series unit This manual is the property of the owner Leave this manual with the unit when set up and start up are complete SpotCooling Systems reserves the right to change design and specifications without prior notice TABLE OF CONTENTS Unt SD SCIICAMONS sasoien 1 SCT Series COm
9. desired temperature by simply rotating the WARMER COOLER dial either left or right The supply air fan can be set to run continuously whether the cooling circuit cycle is on and off or can be set to cycle on and off with the cooling circuit temperature dial WARMER COOLER automatic fan OFF continuous fan COOL FAN AUTO All units are equipped with removable washable aluminum mesh air filters Located behind the return air and discharge air grills these can be removed and easily cleaned A five gallon polyethylene tank in the lower front compartment of the unit collects evaporator coil condensate moisture When full the weight of the tank activates a cutout switch turning the refrigeration circuit OFF and illuminating the condensate tank full light on the unit s front The tank is readily accessible behind a hinged door Simply remove drain replace and restart NOTE The unit will not operate unless the tank is drained periodically An optional condensate pump is available for continuous operation SCHEMATIC SCT 14 30 42 Unit Voltage Phase Hertz Plug SCT 12 120 1 60 5 15P ScT 24 208 230 1 60 6 20P sct 208 230 1 60 6 30P Plug Condenser tarter Compressor otor Condenser Eva lai Start C it art Capacitor arter BK paci BR Plug Locations BL BK J1 Evaporator Compartment J2 Condensate Compartment BK 120 volt for 120 volt units Evaporator W R 208 vol
10. ed temperature by adjusting the WARMER COOLER dial from 68 F 115 F NOTE Wait 4 minutes between turning cooling mode off and on 10 PREVENTATIVE MAINTENANCE Filters Blower Motors Coil Cleaning Condensate Pump The SCT series provides maximum performance and reliability with minimum maintenance The refrigeration and electrical Duct Kit circuits of the system should be serviced by qualified techni 2 cians only To prolong the life of the unit perform regular main tenance as described below A clogged filter causes the unit to operate at reduced efficien cies Inspect filter every six weeks or more if operating in a dirty environment The evaporator s washable aluminum filter is located behind the return air grille and can be easily re moved by pulling out the grille opening the return air grille and slowly lift towards hinge The condenser s washable aluminum filter is located in the lower back of the unit Remove by releasing the retaining clip and pull out Wash filters periodically by placing them in a dish washer or soak in a solution of warm water and detergent for ten minutes Rinse clean with hot water shaking excess mois ture from filter to dry The blower motor has permanently lubricated ball bearings and require no lubrication Inspect fan for buildup of dirt on blades Clean as needed Condensate 1 Clean evaporator and condenser coils using compressed air Pump 1 Disconnect unit f
11. lenum condensate pump kit cord kit INSTALLING REPLACEMENT PARTS Fan Motors SCT 14 thru SCT 42 Fan Motors SCT 83 Red Indicator Light a l l SS 6S a Disconnect power from unit Remove cabinet s side panels Disconnect evaporator motor wires at the connector plug Disconnect condenser motor wires at the connector plug Remove unit s top and disconnect thermostat at the connector plug Remove screws securing blower mounts All screws are external and visible Remove motors and blower and assemblies Remove blower and fan assembly Install new motors reversing the removal process Disconnect power from unit Remove cabinet s side panels Disconnect wires from motor that needs to be replaced Disconnect belt from drives Remove bolts holding motor onto motor mount Remove sheave from motor Install new motor reversing the removal procedure Adjust sheave and belt tension as outlined in preventative maintenance Disconnect power from unit Disconnect wires from control panel bend tinnerman clip holding light and pull out Install new light reversing the procedure UNIT OPERATION Fan 1 Place unit on level surface 2 Plug unit in 3 Press the COOL FAN on switch for continuous fan opera tion The cooling circuit will cycle on and off 4 Press the COOL FAN AUTO switch for cycling the fan oper ating on and off with the cooling circuit Cooling Cycle 1 Set the desir
12. of unit Install drain hose from condensate pump outlet through hole in side of unit to a convenient drain or outdoor location 14 TROUBLESHOOTING continued PREVENTATIVE MAINTENANCE 1 SCT 83 evaporator and condenser fans Conditioned air and con Water leaks from Leaky drain pan Replace pan l pan denser air are controlled by using double inlet forward curved fans driven by belt and sheave combination Drain plugged Check and clear obstruction Adjust belt tension for 3 16 in deflection with 2 Ibs force Loose evaporator drain or Tighten connection condensate pump hose The evaporator fan and condenser fan sheaves are factory Defective condensate pump If elevation exceeds 15 ft a larger operate properly if combination of sheaves are securely fastened to blower shafts by tightening height and length of drain exceeds 15 ft Change pump if defective the set screw on the stationary half of sheave Sheave If necessary adjust pitch by loosening the set screw on the Adjustment adjustable half of the sheave Turn sheave clockwise until it touches the stationary shaft Evaporator coil Evaporator exhaust screen Remove obstruction freezing and obstructed To adjust evaporator motor sheave shuts unit down Freeze protection control not Check that control is securely attached Turn sheave counterclockwise 3 1 2 turns and tighten set operating correctly SCT 14 to evaporator coil s outlet and that screw
13. or indicator light defective light if defective capacitor s Open fan motor coil circuit Replace fan motor Shorted or open fan motor Replace capacitor capacitor Overload relay tripped Open rear access cover push in red SCT 83 manual reset button on overload relay wait 5 min for compressor to restart See Preventive Maintenance section of this manual e Clean filter Insufficient airflow through evaporator coil due to e Dirty air filter in unit e Clean filter with vacuum cleaner and hose e Defrost Run on fan only e Dirty evaporator coil e Ice on evaporator coil e Obstructed air intake e Remove obstruction e Low refrigerant e Repair leak in system Unit improperly sized Check to assure unit is sized for load Add supplemental unit if required Copper tubing vibrating Adjust by bending slightly to firm posi tion Separate tubes touching cabinet or each other Loose cabinet or internal Check and tighten loose screws component Machine vibrating out of level Level unit base Blower motor bearing defec Replace blower motor tive
14. or portability For simplicity and reliability all models are supplied with a manual temperature control The SCT series are designed for ease of operation an drugged dependability Follow installation and maintenance instructions completely The SCT series portable air conditioners have removable side panels for easier servicing from all sides The interior of the unit is divided into four sub compartments The upper right encloses the evaporator coil and fan and provides access to the thermostat and fan switch The lower right contains the condensate tank and access to the high pressure switch The condenser fan on air cooled models can be found in the upper left compartment The lower left compartment encases the condenser coil compressor and most electrical components SCHEMATIC SCT 83 208 230V 1 Phose _ _ _ 60 Hertz Field Wirin Terminal By others Block Plu Locations Ji Evaporator Compartment J2 Candensote Compartment J2 2 Evaporator Blawer Matar Contr Fan ON OFF AUTO Transformer Switeh Evapprotor Starter Cail Condensate Full Light Condensate J2 4 Full Switch BL J1 3 J2 5 Condenser Starter Coll J2 6 V a B Q Splice Condenser Blower Hs slag ar Freeze Motor Overload Contact Starter Control Short Cycle Timer 5 Min High Pressure wita Ji Jumper Plug P N 88800 165 J1 6 Y 20 SCHEMATIC SCT 18 STANDARD FEATURES
15. ponentsS aaaaaazzanan nnnannaannnnunnnnnnnnnnnnnnnnnunnnnnnnnnnnuna 2 Equipment Checklist aaaaaaazaa nnannnnnnnnunnnnnnnnnnnnnnnnnununnnnnnnnnnnna 3 Standard Features anaaaaanaaaann nnnnnnnnnnnnnnnunnnnnunnnnnunnnnunnnnnununa 5 Optional Fe luUreS nd ssvna nd al 6 Installation Instructions 22naaaaaannn nnnnnunnnnnnnnunnnnnnnnnnnnnnnnnna 7 Unit OSA ON uo 8 Preventative Maintenance a22annaaaaaunsnnnnnnnnnnnnnnnnnnnnnnnnnna 9 Troubleshooting Guide aaaaaaaaaaaaaaaaaa n n nnnnnnnnnnnnnnnnnnnnnnunnnnnnnna 11 Installing Replacement PartS aaaaaaaaaaaaaaaaaaaaaaaaanannnnnnnnnnnnna 14 PROC CS SOUS S oea ee 16 SchematicS a aaanaaaaann xansn sanunnnnnunnnnnunnnnnnnnnnununnnnnunnnnnunnnnnnnnnnana 18 Warranty R 22 M SPOTCOOLING Systems INCORpORATEd UNIT SPECIFICATIONS Rating Information Specification Cooling Capacity BTU hr Ton Power Supply volt hertz phase amps Thermostat Control Metering Device Total Power Consumption kW Current Consump tion amps Recommended Cir cuit amps NEMA plug type Energy Efficiency Rating Evaporator CFM free discharge Condenser CFM Compressor Type Maximum esp in wc Maximum Duct Length ft Condensate pump head ft Operating Limits min max F Sound Level dB R 22 Charge oz Lx Wx H in Weight net ship Ib 1 Rating conditions 95 F at 60 RH
16. rom power source before attempting to service or remove any component 2 Be sure floats move freely Clean as necessary 3 Remove floats and check for obstructions Clean as needed 4 Clean tank with warm water and mild soap when mineral deposits are visible 5 Check inlet and outlet piping Clean as necessary Be sure there are no kinks in the lines that can inhibit flow 6 Clean exterior with a damp cloth Do not allow water to enter condenser fan outlet or the thermostat Ceiling Panel 1 S 2 oh INSTALLING REPLACEMENT PARTS Secure one end of the duct to the ceiling panel adapter and the other end over the unit s duct collar Place the ceiling panel adapter under suspended ceiling panel s framework directly above unit a replace ceiling panel 8 ft maximum with adapter panel provided in kit fasten collar to unit F using supplied screws LTM TAHTA THIN TT TEE Ea Hil TINT TEE Ea l TENEAT ATN Unplug unit from power source Remove condensate tank and hose from drain pan Place condensate pump on condensate tank shelf Align holes in shelf with mounting slots in molded tank Secure pump to condensate tank shelf using two supplied sheet metal screws Remove electrical plug and jumper wire from receptacle located on bulkhead next to the service fittings Connect condensate pump s power plus to receptacle Install hose from drain pan to the pump inlet Remove plug from hole in side
17. runs from the unit to a convenient drain or outdoor location The cord kit simplifies wiring for model SCT 83 by providing a plug and socket assembly that is wired directly to the unit and the main power source This allows the use to plug and unplug the unit for maintenance or storage INSTALLATION INSTRUCTIONS Before Check unit for damage Air conditioners are inspected at the Installing factory If any damage has occurred save the packaging and file a claim with the delivering carrier within fifteen working days The SCT series requires minimal installation Plug unit in proper NEMA receptacle and it begins to cool immediately Plug Configuration Receptacle ISA 115V NEMA 5 15P NEMA 5 15R SCT 30 20A 230V 208 230V NEMA 6 20P NEMA 6 20R SCT 42 30A 230V 208 230V NEMA 6 30P NEMA 6 30R SCT 83 460 3 Hardwired Determine the proper power by checking units rating plate Refer to the Specifications section on page 1 for voltage and fuse requirements Use wall outlets and receptacles found in the table above Electrical Supply Operating unit on improper voltages voids the warranty NOTE Extension cords may be used if rated at a minimum 120V 20 amp for models SCT 14 and SCT18 or 230V 30 amp for model SCT 42 Extension cords can NOT be used with the SCT 83 ACCESSORIES ceiling discharge kit supply duct adapter nozzle kit condenser B return air plenum msg x evaporator Fe return air p
18. t for 230 volt units an Motor SCT 12 AND SCT 24 Control Transformer Start Capacitor BK O gt Y BL BL Condenser Evaporator Fan Motor Fan Motor Sensor L SCT 24 SCT 36 Board Thermostat R Evaporator Starter Coil W Condensate Full Light Condensate Full Switch Freeze Control Condenser Short Cycle LO High Pressure Starter Coil Timer 5 Min Switch Fan Motor SCT 12 AND SCT 36 18 ACCESSORIES Call 800 683 7768 to order accessories Senses Net ie tinnarona x Nea vo innara vitassa x x x Two 8 in nozzles with attachment kit m CK 10 in ceiling discharge kit X 14 in ceiling discharge kit 14 in ceiling discharge kit 20 in ceiling discharge kit Condensate pump 115V Condensate pump 208 230V 10 in condenser return air plenum 14 in condenser return air plenum X i H i H i ha C 14 in condenser return air plenum C 10 in evaporator return air plenum 14 in evaporator return air plenum X 14 1n evaporator return air plenum RA 20 in condenser return air plenum 20 in evaporator return air plenum 6 in cold air supply duct adapter 10 in cold air supply duct adapter 4 14 in cold air supply duct adapter CD 60 6 ft NEMA 6P 50 cord kit 17 X 2 1 2 3 4 1 2 3 4 6 1 1 Soa fe tt fet A S SASi A e e fet Tee eee x TE TT Te Te RR TIR OPTIONAL FEATURES Ceiling Discharge Kit Condenser Return air Plenum Supply Duct Adapter
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