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52S
SERIES
SERVICE TECHNICIAN GUIDE
PACKAGED TERMINAL AIR CONDITIONERS
AND HEAT PUMPS
Page
CONTENTS
Page HEATERS...................................... 22,23
COMMON CAUSES OF HEATER FAILURE.............. 22
INTRODUCTION ................................. 2,3
HEATER REMOVAL .............................. 22
SUMMARY OF DANGERS, WARNINGS,AND CAUTIONS ...2
OPERATING CONTROLS ......................... 24-31
GENERAL DISASSEMBLY........................... 4-9
DESCRIPTION OF SWITCH SETTINGS...............
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52S SERIES INTRODUCTION The focus of this manual is to provide basic information Knowing which model is being serviced will help deter- on service procedures, safety, troubleshooting, clean- mine if the unit is performing at optimum levels. The ing, and component replacement for service technicians. model number is located on the data information plate It is intended for use only by HVAC service tech- beneath the front panel of the unit. The data infor- nicians who have successfully completed in
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FIGURE 2 — MODEL NUMBER NOMENCLATURE FIGURE 3 — SAMPLE DATA INFORMATION PLATE 3
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52S SERIES GENERAL DISASSEMBLY This section includes common procedures for disassem- bly and reassembly of 52S units. These instructions CONTROL BOX are general in nature and include procedures the tech- nician may be called upon to perform when accessing ACCESS certain components of the 52S unit. COVER Itisimportanttocarefullyfollowmanufacturer’sinstruc- tions when disassembling or reassembling a unit for cleaning, maintenance, or part replacement. When dis- assembling wiring, it is strongly re
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TO REMOVE THE LATERAL DUCT EXTENSION, FOR UNITS EQUIPPED WITHTHELATERALDUCTACCESSORY PACKAGE 1. Remove the front panel as shown in Figure 1. 3 2. Remove the four 1 ⁄4-in. screws that secure the chassis to the wall sleeve (see Figure 6). There are 2 screws on each side. 3. Remove the 2 screws that secure the lateral duct ex- tensiontothetopofthelateralductadapterasshown in Figure 7. FIGURE 7 — DUCT EXTENSION SCREWS 4. Locate and remove the 2 screws that secure the lateral duct extension to the br
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52S SERIES TO ACCESS INDOOR-AIR SECTION COMPONENTS n DISASSEMBLING THE LATERAL DUCT ADAPTER, FOR UNITS EQUIPPED WITH THE LATERAL DUCT ACCESSORY PACKAGE 1. Remove the lateral duct adapter end cap, shown in 1 Figure 10, by removing the two ⁄2-in. screws 2. Remove the adapter top panel by removing one screw at each end of unit as shown in Figure 11. Rotate the front of the panel up and back and lift free. 3. Rotate and lift the air baffle out of the unit. See Figure 12. 4. Remove the 2 screws holdi
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n TO REMOVE THE AIR DISCHARGE GRILLE 1. Remove the 2 screws on each end of the air discharge grille as shown in Figure 14. 2. Lift and rotate back the bottom edge of the discharge grille and remove it. FIGURE14—REMOVINGAIRDISCHARGEGRILLE n TO REMOVE THE ALUMINUM TOP PANEL — Remove one screw from each end of the aluminum toppanel(locatedontheundersideofthepanel)asshown in Figure 15. On the left side of the unit, remove the screw closest to the side of the unit. TOP PANEL SCREW FIGURE 15 — ALUMINU
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52S SERIES DISCHARGE DECK SCREWS n TO REMOVE THE DISCHARGE DECK 1. Remove the 2 discharge deck screws shown in Figure 17.Also remove the screw located at the top left corner of the outdoor coil tube sheet. 2. Gently pull the left side panel out and lift the end of the discharge deck that the screws were re- moved from, up and forward, to remove. FIGURE 17 — DISCHARGE DECK REMOVAL CONDENSER ORIFICE TO ACCESS OUTDOOR-AIR SECTION COMPONENTS GUSSET n TO REMOVE THE GUSSET 1. Remove the 2 screw
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STATOR CONDENSER n TO REMOVE THE STATOR —After pulling the top ORIFICE of the condenser orifice away from the condenser coil, grasp the top of the stator and slide it up and out of the CONDENSER stator track. See Figure 20. COIL FIGURE 20 — REMOVING STATOR 9
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52S SERIES GENERAL CLEANING Maintaining proper performance of 52S systems (Figure 21) requires conscientious cleaning and care of Before cleaning, servicing, performing maintenance, components. Specific components require periodic clean- or removing the chassis from the wall sleeve, discon- ing and/or replacement, including the following: nect all power to the unit to avoid the possibility of COMPONENT CLEANING SCHEDULE electrical shock and personal injury. Only trained and qualified service perso
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TOOLS NEEDED MONTHLY CLEANING The following list includes the recommended tools, de- n AIRFILTERS —Theindoorandventairfiltersshould vices, and cleaning solutions for use in cleaning the 52S be cleaned once per month. Filters that are not cleaned unit components. becomecloggedandwillrestrictairflow.Thismaylead to major component damage. If a filter becomes torn, has holes, or other damage, replace it with a new one. Re- Vacuum Cleaner with Crevice Tool Attachment, placement filters are available thro
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52S SERIES n CLEANING THE VENT AIR FILTER 1. Removetheunitchassisfromwallsleeveasdescribed in the General Disassembly section of this manual. See Figure 6. 2. Swing open vent door. The filter is located directly behind the vent door. See Figure 23. 3. Remove the vent air filter by gently pushing on the filter slot. Once the vent air filter is removed, it may be cleaned usingeitheravacuumcleaner,orasoftbristlebrush and a small amount of mild dish detergent. If deter- gent is used, remove detergent re
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9. Remove the stator from the outdoor coil. See SEASONAL CLEANING GENERAL DISASSEMBLY section.After cleaning, n ACCESSING THE INDOOR AND OUTDOOR reassemble by reversing steps1-8. COILS — The minimum cleaning recommendation for indoor and outdoor coils is once per season. To access IMPORTANT: During reassembly of the fan section, the coils for a thorough cleaning, it is necessary to carefully align the rubber seal around the tubing where remove theAir System. To accomplish this task, per- it pass
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52S SERIES n CLEANING THE INDOOR AND OUTDOOR COILS Coil fins are sharp and may cut hands. Wear heavy protective gloves when cleaning coils. 1. Use a vacuum cleaner or soft bristle brush to remove surface fibers and dirt from each of the faces of the coil. Both the inner and outer surfaces of the coils must be cleaned. It is important to apply the tool in thesamedirectionofthefins,notagainstthem. Applying the tool against the fins may cause damage (fin edges may bend over). 2. Withatanksprayeroratrigg
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n CLEANING THE INDOOR FAN AND FAN SCROLL — Once the indoor fan wheel and the indoor fan scroll have been accessed, proceed with the cleaning instructions detailed below: 1. Insert a piece of 9.5-in. by 9.5-in. cardboard between the blower wheel and the opening in the blower scroll to prevent fungus and other debris from falling into the coil. 2. Bend a soft, spiral wound, long bristle brush, to con- form to the inner curve of the blower wheel blades. See Figure 30. 3. Insert the brush into every
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52S SERIES COMPRESSOR Acutaway view of the rotary compressor with key com- bearing provides a thrust surface for the shaft and the ponents labeled is shown in Figure 32. The motor sta- rolling piston. Compressed gas is separated from the tor is rigidly attached to the compressor shell. The rotor suction gas by the vane. Discharge gas pressure and the is pressed onto the eccentric shaft, which is supported vane spring keep the vane in contact with the rolling by 2 bearings. Both the discharge val
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The rotary compression process (Figure 33), starts at COMPRESSOR TROUBLESHOOTING top dead center as shown in (1). Suction gas flows Refer to Figure 34 for a basic compressor troubleshoot- through the suction inlet and into the cylinder area.As ing chart. the shaft rotates through 90 degrees, the rolling pis- ton moves to positionAas shown in (2). The suction vol- BASIC HERMETIC COMPRESSOR ume is now the area defined by pointAand the tip of the vane. Gas in the remaining volume has been com- ELECTR
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52S SERIES COMPRESSOR COMPRESSOR COMPRESSOR g SYMPTOM COMPRESSOR COMPRESSOR STARTS AND STARTS AFTER WILL NOT WILL NOT START CYCLES OFF RUNS BUT CYCLING THE START. IT HUMS POSSIBLE CAUSE AND MAKES NO (NOT ON CYCLES ON THE OVERLOAD AND CYCLES ON NOISE OVERLOAD) f OVERLOAD SEVERAL TIMES THE OVERLOAD COILS/FILTERS DIRTY OR PLUGGED X AIR OR NONCONDENSABLE GASES XX IN SYSTEM SYSTEM REFRIGERANT OVERCHARGED X X DISCHARGE LINE RESTRICTED XX CAPILLARY TUBE OR STRAINER XX X RESTRICTED OR PLUGGED FAN BLADE
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5. Next, test the resistance individually of each wire to COMPRESSOR REPLACEMENT the shell of the compressor. The paint on the com- Before working on the compressor, read the instructions pressor can prevent good contact between the probe thoroughly and gather the necessary tools for the job. and the metal. The paint should be removed from Review all safety information on unit and in literature. asmallsectionoftheshellofthecompressortoensure Always turn off all power to unit to avoid the possibi
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52S SERIES n REMOVINGTHECOMPRESSOR —Followthesteps below to remove the compressor: 1. Disconnect all power to unit. 2. Remove unit from wall sleeve as detailed in the GENERAL DISASSEMBLY section. The unit weighs up to 150 pounds. Seek assistance or use a lifting device when removing unit from wall sleeve. 3. If the unit is a heat pump: Disconnect the wire plug on the reversing valve solenoid and carefully remove the outdoor thermostat capillary from the outdoor coil. 4. Attach the piercing valve
