A-4400 Series Refrigerated Air Dryers Installation
Contents
1. A 4400 Series Technical Bulletin Expansion Valve Evaporator n Safety Relief Valve Service Valve Figure 9 A 4400 Series Refrigerated Air Dryer with Cover Removed Air Dryers A 4400 Series Technical Bulletin 19 Service Bypass Valve InletFrom y Safety Relief Air Compressor 477 ea i Valve Q Evaporator t y or Regulated Pressure a a Dui ut Gauge TT Y PRV i Suction Line H With Low Discharge Line Heat Tube In Tube Pressure l pes Counterflow Service OX Exchanger Evaporator Gauge Valve l l Q High Pressure f 4 Condenser 1 Output Line Auto Exp g Activated Voltage Valve Automatic Coalescing Carbon Condensate Oil Removal Oil Vapor Drain Trap Filter With Removal Automatic Filter U Drain Figure 10 Schematic of A 4400 Series Refrigerated Air Dryer with Service Bypass Valve Positioned for Normal Operation Shown with Optional Factory Mounted Air Purification System Inlet From gt Safety Relief Air Compressor td q Valve Evaporator 1j ZEN GS Pressure a y Exhaust i Regulated Gauge f iu Service PRV FUE Suction Line 4 3j1 Bypass With Low Discharge Line Heat Tube I2. Dimensions mm Air Connections The high pressure side of the compressed air line after the compressor tank must be connected to the 3 8 in compression inlet air connection On models with an optional factory mounted Air Purification System this inlet air connection is located on the service bypass valve These models also include a capped high pressure outlet connection refer to Figure 1 directly ahead of the PRV To use this connection remove the cap and connect the high pressure outlet line to the 3 8 in compression connection provided Check all air line connections for leakage Air Dryers A 4400 Series Technical Bulletin 5 Base Mounting Several mounting hole patterns are provided in the base of the A Arrangement 4400 refer to Figure 2 for securing the unit to a platform These mounting holes are sized for 1 4 20 self tapping screws or a No 12 nut and bolt combination all field furnished Mounting Holes Eight Locations for 1 4 20 10 7 8 Self tapping Screws 276 ora No 12 Nut and Bolt Combination All Field Fumished gt D 5 1 2 140 7 1 2 191 9 11 32 237 13 11 16 348 x reef Figure 2 DryFlow A 4400 Series Refrigerated Air Dryer Base Mounting Hole Patterns Plan View i in Dimensions mm Activated On models with an optional factory mounted Air Purification System the Carbon Filter activated carbon o
3. in either direction Drop the metal bowl guard and bowl to expose the filter element 14 Air Dryers A 4400 Series Technical Bulletin Activated Carbon Oil Vapor Removal Filter Pressure Reducing Valve Power On Fail Lamp 4 Viewing the old filter from the bottom turn the element counterclockwise to remove it 5 Clean the small screen around the drain seat of the automatic drain valve by turning the filter bowl upside down and tapping it lightly 6 Visually inspect the bowl for signs of cracking If the bowl is cracked it will be necessary to replace the complete assembly A 4000 1048 or A 4000 1049 ordered separately If the bowl is not cracked clean it and the drain valve assembly using a liquid household detergent 7 Install the new filter element and connect the drain For optimal filtering performance it is recommended that the filter element be presoaked with clean oil 8 Return the service bypass valve to normal operation by pushing the plunger left to its original position Reinstall the locking pin to ensure that the plunger remains positioned for normal operation Refer to the white service label on the activated carbon filter element being replaced for the proper replacement procedure After the activated carbon filter element has been replaced apply the white service label included with the new element and record the next replacement date month and year Determine this date following the proce
4. Air Dryers A 4400 Series Technical Bulletin 3 Turn the expansion valve adjusting screw to provide an evaporator pressure that corresponds to the ambient temperature determined in Figure 5 Turning the screw clockwise increases the pressure counterclockwise decreases the pressure One complete revolution 360 degrees equals a pressure change of approximately 10 5 psi 73 5 kPa Note If when adjusting the screw clockwise and counterclockwise the expansion valve does not respond and the evaporator pressure remains high a foreign object may be lodged in the expansion valve orifice To clear the orifice turn the expansion valve adjusting screw clockwise as far as possible taking note of the number of revolutions made Then return the screw counterclockwise to its original position and check the evaporator pressure 4 Allow 20 minutes running time to stabilize the system then reset the refrigerant pressure if required If after adjusting the expansion valve setting the evaporator pressure is still too low the refrigerant charge is probably low To recharge the system proceed as follows 1 Disconnect the power supply to the air dryer 2 Remove the filter bowl and test for possible internal refrigerant leaks by allowing a small amount of supply air to pass through the unit Check for traces of gaseous refrigerant in the escaping air using a HFC 134a detector at the condensate drain trap refer to Figures 10 and 11 If an inter
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6. The evaporator pressure gauge is calibrated to a test gauge at the factory Readings are recorded on a label inside the dryer cabinet base Apply this correction to the evaporator gauge to obtain a precise reading The A 4400 Series Refrigerated Air Dryers are factory set to protect against air side freeze up down to ambient temperatures of 40 F 4 C and altitudes up to 1500 ft Using the corrected no load evaporator pressure gauge reading and current ambient temperature refer to the graph in Figure 5 to determine if the evaporator pressure is at the proper setting If the value is within the acceptable operating zone as shown on the graph then no further adjustments are necessary If the value is not within the acceptable operating zone then it will be necessary to adjust the expansion valve Refer to the Refrigeration Service section and follow Steps 1 through 5 readjusting the expansion valve setting to properly adjust the expansion valve until the evaporator pressure gauge is at the adjusted pressure Note All of the expansion valve settings are based on no load conditions position the service bypass valve into the bypass mode Allow the unit to run unloaded a minimum of 10 minutes prior to checking evaporator pressure or adjusting the expansion valve If the air dryer is installed in high altitudes the expansion valve will have to be adjusted to compensate for the new ambient pressure For altitudes from 1500 to 5000 ft increase
7. 4000 1049 Filter Element with O Rings Air Dryer Model A 4412 0 1 A 4110 604 A 4417 and A 4423 A 4000 604 Universal O Ring Kit for Filter 0 03 A 4000 620 Element Bowl Replacement Drain Valve A 4000 6010 Manual Override for Drain 25 A 4000 1054 Valve Carbon Filter Element Only Air Dryer Model A 4412 1 7 A 4000 632 A 4417 and A 4423 A 4000 633 Safety Relief Valve A 4000 144 J Condenser Fan Motor A 4300 601 Power On Fail Lamp A 4300 602 Insulating Tape Not Shown Order in multiples of 30 ft 1 2 A 4210 603 Start Relay Tecumseh PN P82928 820 10052 Overload Relay P83458 830 10041 Tecumseh P N b x 0 454 kg Includes A 4000 156 filter new mounting bracket mounting hardware tubing and drain pipe adapter The A 4000 6010 replacement drain valve does not include a bowl to body O ring If this O ring is needed order the A 4000 620 Kit separately An F 400 20 Coupling 1 8 in external NPT x 1 8 in internal NPT is included with the replacement drain valve The A 4000 6010 auto drain and A 4000 1054 manual override assemblies are only compatible with each other and do not work with the A 4000 610 auto drain and A 4000 154 manual override assemblies Ig NEC Em 0 1 0 2 1 7 0 4 1 1 0 1 2 0 Air Dryers A 4400 Series Technical Bulletin 27 Jk MM Johnson i Michigan Street Milwaukee Controls Metasys and Johnson Controls are registered trademarks of Johnson
8. J 7 Pneumatic Air Supply Manual 718 J ohnson M Air Dryers Section ms Technical Bulletin Con trols Issue Date 1213 A 4400 Series Refrigerated Air Dryers Installation and Maintenance INTRODUCTION 3 Product Overview 3 INSTALLATION PROCEDURES 4 Location 4 Unpacking the Unit 4 Conventional Wall Mounting Arrangement 4 Air Connections 5 Base Mounting Arrangement 6 Activated Carbon Filter Installation 6 Drain Connections 7 Permanent Wiring Using Conduit 8 Wiring to Air Compressor 9 COMMISSIONING 10 Gauge Correction 10 Evaporator Pressure Adjustment 10 Altitude Compensation 10 Low Ambient Temperature Compensation 11 SERVICING PROCEDURES 12 Particle Filter 12 Coalescing Oil Removal Filter 13 Replacement Coalescing Oil Removal Filter Element Kit 14 2013 Johnson Controls Inc 1 Part No 64 378 14 Rev C Code No LIT 718050T Activated Carbon Oil Vapor Removal Filter Pressure Reducing Valve Power On Fail Lamp Refrigeration Service Condenser Fan Motor Replacement Condenser Air Dryer Compressor Motor Wiring Circuit Excessive Vibration SPECIFICATIONS REPAIR INFORMATION 2 Air Dryers A 4400 Series Technical Bulletin 15 15 15 16 21 23 23 24 25 26 Product Overview Introduction The A 4400 Series Refrigerated Air Dryers are designed for continuous operation to supply dry air to pneumatic control systems All components are selected and assembled to provide dependable service over a long
9. L bracket Retain the screws and bracket for reassembly Noting the orientation of the motor and its leads peel the old fan motor off of the protecting screen leaving as much of the black vibration dampening tape behind as possible Install the replacement fan motor A 4300 601 ordered separately in the same orientation noted in Step 9 Secure the motor and the fan motor support L bracket to the mounting bracket using the screws retained in Step 8 Using a cable tie field furnished secure the motor leads to the protecting screen to keep the motor leads away from the fan blades during operation Reassemble the fan blade to the motor in the same orientation noted in Step 6 and secure it in place using the fan blade retaining nut Slide the fan motor assembly into the cabinet over its base mounting location Secure the fan motor assembly to the cabinet base using a 3 8 in wrench and the mounting screws retained in Step 4 Air Dryers A 4400 Series Technical Bulletin 21 16 17 18 I9 Splice the two leads of the replacement fan motor to the existing leads using wire nuts field furnished Reconnect the power supply to the air dryer Check for excessive vibration If the unit is vibrating excessively it is likely that one or more of the fan blades is misaligned To align the blades refer to the Excessive Vibration section in this bulletin Reinstall the cabine
10. Motor Wiring Diagram Excessive If the A 4400 appears to be vibrating excessively it is likely that one or more Vibration of the condenser fan blades is misaligned To align all five fan blades proceed as follows 1 Disconnect the power supply to the air dryer 2 Placea reference such as a piece of cardboard against the trailing edge of one of the fan blades 3 Manually rotate the fan and observe the relative alignment of all five blades with respect to the reference in Step 2 4 Ifa blade appears to be out of alignment as compared to the other blades bend the blade back into line by hand Continue until the trailing edges of all five blades are aligned horizontally within 1 4 in 6 mm 5 Reconnect the power supply to the air dryer and check that the excessive vibration has been eliminated Repeat the above procedure as necessary 24 Air Dryers A 4400 Series Technical Bulletin Specifications Product Electrical Rating Current Draw Refrigerant Compressor Agency Listings Ambient Operating Temperature Limits Ambient Storage Temperature Limits Pressure Drop with 80 psig 560 kPa Supply and Rated Flow Maximum Input Pressure Connections Finish Accessory Order Separately A 4400 Series Refrigerated Air Dryers 115 Volt 60 Hz Single phase Electrical Service 5 75 Amperes R 134a HFC Hermetically Sealed UL Listed cUL Listed Category Code SROT File SA8490 40 to 115 F 4 to 46 C with maximum d
11. bottom clearance Hand protection is required when removing the A 4400 from its shipping carton Proceed as follows 1 Cut the two adjacent corners of the front carton panel from top to bottom then fold the panel down Remove the air dryer from its shipping carton through the exposed side 2 Wearing proper eye protection and using a pair of wire cutters reach into the air connection side of the air dryer and cut the steel packing band securing the compressor to the shipping chipboard 3 Tip the air dryer slightly on its edge and carefully remove the steel packing band and discard Also slide the shipping chipboard out and discard 4 Remove and discard the packaging cardboard from behind the coalescing filter if applicable Models A 4412 1 A 4417 1 and A 4423 1 Two key slots are provided at the rear of the A 4400 for wall mounting the unit refer to Figure 1 Install the bolts and appropriate anchors field furnished in the wall at 16 in 406 mm center to center spacing in a level arrangement Hang the A 4400 on the bolts and tighten as required Note The key slots center to center spacing can be hand adjusted approximately 1 2 in 13 mm if needed when hanging the unit on the mounting bolts This wall mounting arrangement provides proper air circulation allows easy access to the interior of the unit and makes it convenient to remove the particle filter and automatic condensate drain trap assembly through the bo
12. compressor terminal box through Hole 1 as illustrated in Figure 3 12 in 305 mm should be long enough 2 Stripthe wires back approximately 1 in 25 mm Attach the strain relief bushing provided with each unit to the line cord approximately 3 in 76 mm from the cut end and insert it into Hole 1 4 Connect the conduit to Hole 2 as illustrated in Figure 3 and join the leads together using the appropriate wire nuts field furnished Wire Nuts Field Furnished Hole 1 with Strain Relief Bushing Inserted Hole 2 Compressor Line Cord Figure 3 Permanent Wiring Using Conduit 8 Air Dryers A 4400 Series Technical Bulletin Wiring to Air Wiring may be run through the load side of the air compressor disconnect Compressor switch ahead of the Pressure Electric PE switch as illustrated in Figure 4 Doing so will allow continuous A 4400 operation whenever the disconnect switch is closed while control over the air compressor is retained by the PE switch Note The air dryer motor voltage must match the air compressor motor voltage in order to wire the unit as illustrated in Figure 4 Air Dryer 115 VAC 60 Hz Pressure Air Compressor Switch Air Compressor Disconnect Figure 4 Single Phase Air Compressor Motor Air Dryers A 4400 Series Technical Bulletin 9 Gauge Correction Evaporator Pressure Adjustment Altitude Compensation Commissioning
13. dure outlined earlier in the Activated Carbon Filter Installation section Upon system startup the output of the pressure reducing valve would be approximately 15 to 20 psig 105 to 140 kPa Note For optimal performance it is suggested that the pressure reducing valve be readjusted at the normal system flow rate To adjust this pressure pull up on the black knob and turn until the desired pressure is read on the low pressure gauge Push down on the knob to lock the desired pressure setting The safety relief valve is factory set at approximately 33 psig 231 kPa The power on fail lamp is located below the coalescing oil removal filter The lamp is ON illuminated when there is power to the A 4400 and the compressor overload relay is closed no overload condition exists If the air dryer is running and the power on fail lamp is OFF the lamp will need to be replaced as follows 1 Disconnect the power supply to the air dryer 2 Cutthe two leads leaving behind a convenient length of wire for use with the replacement bulb Air Dryers A 4400 Series Technical Bulletin 15 Service Slide the old lamp forward out of its cutout and discard a pliers may be required 4 Splice the replacement bulb to the existing leads using wire nuts field furnished 5 Slide the replacement lamp A 4300 602 ordered separately into the cutout and push in until it reaches the chrome stop 6 Reconnect the power supply to the air dryer Chec
14. e unit refer to Figure 7 On a new filter this indicator is green in color As the pressure drop across the filter increases a slide within the indicator moves bringing some red color into view When the pressure drop reaches 7 5 psig 52 5 kPa the indicator becomes entirely red indicating that the filter element needs to be replaced Even if the indicator is not entirely red it is recommended that the filter element be replaced annually Air Dryers A 4400 Series Technical Bulletin 13 Replacement Coalescing Oil Removal Filter Element Kit Pressure Drop x Indicator Note Even if the indicator is not entirely red it is recommended that the filter element be replaced annually Coalescing ee e Filter Element a men and O rings a ___ Replacement m T 1 Drain Valve Complete Assembly o gt Universal Pd O ring Kit Figure 7 Coalescing Oil Removal Filter Each kit includes one replacement filter element one filter element O ring and one filter bowl O ring refer to Figure 7 To replace the filter element proceed as follows 1 Remove the service bypass valve locking pin and push the plunger to the right into the bypass position Doing so will unload the pressure in the filter bowl 2 Disconnect the drain tubing Depress the lever on the filter bowl clamp and turn it 1 8 revolution
15. ew point of 86 F 30 C non condensing 40 to 140 F 40 to 60 C A 4412 1 10 psig 70 kPa A 4417 1 17 psig 119 kPa A 4423 1 33 psig 231 kPa 125 psig 875 kPa 3 8 in Compression Fittings for Polytubing or Copper Tubing Gray Enamel A 4000 154 Manual Override for Coalescing Oil Filters A 4412 2 4 psig 28 kPa A 4417 2 8 psig 56 kPa A 4423 2 15 psig 105 kPa The performance specifications are nominal and conform to acceptable industry standards For application at conditions beyond these specifications consult the local Johnson Controls office Johnson Controls Inc shall not be liable for damages resulting from misapplication or misuse of its products Air Dryers A 4400 Series Technical Bulletin 25 Repair Information INSIDE CABINET BEHIND PRV Figure 15 Repair Parts See Table 3 26 Air Dryers A 4400 Series Technical Bulletin Table 3 Repair Parts Shipping CodeNumber Description Weight Date Codes Date Codes Date Codes Ib through RY1 after RY1 9923 after RY1 9923 1351 G 2010 5 A 4300 603 System Pressure Gauge Evaporator Pressure Gauge Service Bypass Valve A 4300 600 Condensate Filter Complete Assembly A 4000 158 A 4000 156 Bowl O Ring A 4110 610 A 4400 610 Replacement Drain Valve 0 1 A 4110 607 A 4400 607 Particle Filter Element A 4110 608 A 4400 608 Coalescing Filter Complete Assembly for Air Dryer Model A 4412 A 4000 1048 A 4417 and A 4423 A
16. f needed the F 400 20 kit is a 1 8 in external NPT x 1 8 in internal NPT coupler and the F 400 10 kit is a 1 8 in internal NPT x 1 4 in O D compression coupler Both coupler kits must be ordered separately Attach tubing to the connections on the automatic condensate drain trap assembly and the coalescing oil removal filter assembly if present keeping the runs as short as practical in order to reduce back pressure on the automatic drains Use separate drain lines for the automatic condensate drain and the coalescing oil removal filter drain never connect the lines together Note An override feature is incorporated in the coalescing oil removal filter and automatic condensate drain trap which allows manual draining of the bowl To activate the override it will be necessary to remove the tubing and connections from the 1 8 in NPT drain connection at the bottom of the bowl Then using a 1 8 in diameter or smaller rod insert it up into the drain connection until it contacts the override needle This will cause the bowl to drain When the bowl has been drained replace the connections and tubing Air Dryers A 4400 Series Technical Bulletin 7 Permanent All A 4400 Series Refrigerated Air Dryers are furnished with a Wiring Using cord and plug to fit a standard 115 volt receptacle If permanent Conduit wiring is required using conduit proceed as follows 1 Cut the line cord to a sufficient length so that it will reach from the
17. f there is no continuity the relay Tecumseh 820 10052 must be replaced Check for continuity between compressor terminals C and M At an ambient temperature of 77 F 25 C the run winding resistance across terminals C and M should be approximately 3 1 ohms If the run winding resistance is drastically different from the above either replace the compressor or the entire air dryer Check for continuity between compressor terminals C and S At an ambient temperature of 77 F 25 C the start winding resistance across terminals C and S should be approximately 5 6 ohms If the start winding resistance is drastically different from the above replace either the compressor or the entire air dryer Check for continuity between compressor terminal C and the shell of the compressor If there is continuity either replace the compressor or the entire air dryer If all of the above tests prove satisfactory and the unit still fails to operate properly replace the relay Tecumseh 820 10052 Doing so eliminates any faulty electrical characteristics such as improper pickup or dropout which cannot be determined by any of the above tests If the new relay fails to correct the problem either replace the compressor or the entire air dryer Air Dryers A 4400 Series Technical Bulletin 23 Start Relay Black Wire Power Cord Fan Motor Cord I lt j if White Wire E Power On Fail Lamp Figure 13 Air Dryer Compressor
18. il vapor removal filter is packaged separately within the Installation dryer shipping carton and must be installed on the unit in the field as follows 1 Referring to Table 2 note the life of the activated carbon oil vapor removal filter element being installed 2 Divide the element life noted in Step 1 by the average system scfm or L s to obtain the expected life in days 6 Air Dryers A 4400 Series Technical Bulletin Drain Connections 3 Use the expected life calculated in Step 2 to determine the replacement date and record this date on the servicing label on the carbon filter element 4 Remove the red plastic dust cap from the carbon filter pipe connection 5 With the black sealing washer in position on the base of the carbon filter element screw the element onto the male pipe thread and hand tighten to complete the installation Table 2 Carbon Filter Element Life Carbon Filter Element Flow Code Number Capacity Element Life A 4000 147 10 scfm 4 7 L s 4 000 scfm Days 1 888 L s Days A 4000 146 20 scfm 9 4 L s 13 000 scfm Days 6 136 L s Days The automatic condensate drain trap assembly has a 1 8 in internal NPT drain connection and the coalescing oil removal filter assembly on air dryers with an optional factory mounted Air Purification System has a 1 8 in external NPT drain connection Two styles of couplers are available for connecting the drain line to the coalescing oil removal filter assembly i
19. k that the lamp is illuminated when the compressor is running Refrigeration Note Due to the extremely small refrigerant charge in these units as noted on the unit nameplate the service valve should only be used when evacuating and recharging the unit When removing charging equipment from the service valve care must be taken to avoid releasing any amount of refrigerant The integral evaporator pressure gauge with its gauge correction on each unit should be used for all service procedures The A 4400 is factory set to follow the Evaporator Pressure vs Ambient Temperature curve illustrated in Figure 5 If at no load the evaporator pressure rises above the acceptable operating zone one or more of the following conditions may exist The ambient temperature or the air flow may be above the specified limits The expansion valve may be out of adjustment or stuck in the open position The condenser may be dirty The condenser fan motor may be inoperative The compressor may be inoperative If the evaporator pressure is below the acceptable operating zone refer to Figure 5 then either the expansion valve is out of adjustment or the refrigerant charge is low If it is necessary to readjust the expansion valve proceed as follows l Switch the service bypass valve in order to bypass the dryer Allow the unit to run unloaded a minimum of 10 minutes prior to adjusting the expansion valve Remove the cover from the dryer 16
20. move the O ring Visually inspect the filter bowl for signs of cracking If the bowl is cracked it is necessary to replace the complete assembly See Table 3 Item E ordered separately If the bowl is not cracked clean it using a liquid household detergent Turn the baffle counterclockwise and remove Remove the old particle filter element and discard Install the new particle filter element See Table 3 Item E ordered separately Screw the baffle into the filter body until contact is made with the filter element then tighten an additional 1 4 turn To replace the auto drain See Table 3 Item E ordered separately remove the drain retaining nut G invert the bowl and remove and discard the float and seal Install the new seal and float and tighten the drain retaining nut to approximately 25 in Ib of torque Reinstall the filter bowl and O ring Return the service bypass valve to normal operation by pushing the plunger left to its original position Reinstall the locking pin to ensure that the plunger remains positioned for normal operation 12 Air Dryers A 4400 Series Technical Bulletin Coalescing Oil Removal Filter e Figure 6 Particle Filter Auto Drain Replacement The coalescing oil removal filter is equipped with an automatic drain for discharging accumulations of entrapped liquids This filter also features a pressure drop indicator integral to the top of th
21. n Tube Valve Pressure I 3 i 1 Counterflow Service O4 RIED Exchanger Nd i Gauge elie Q aporator 2 High Pressure KON MM Condenser gt Output Line Auto Exp Activated Voltage Valve YAutomatic Coalescing Carbon Condensate Oil Removal Oil Vapor Drain Trap Filter With Removal ta gt Automatic Filter Y Drain Figure 11 Schematic of A 4400 Series Refrigerated Air Dryer with Service Bypass Valve in Bypass Position Shown with Optional Factory Mounted Air Purification System 20 Air Dryers A 4400 Series Technical Bulletin Condenser Fan Motor Replacement To replace the condenser fan motor refer to Figure 12 and proceed as follows l 2 10 11 12 13 14 15 Disconnect the power supply to the air dryer Remove the cover mounting screws and take the cover off the unit Retain screws for reassembly Remove the cable tie securing the cord to the protecting screen Working from underneath the cabinet and using a 3 8 in wrench remove the two mounting screws that secure the fan assembly to the cabinet base Retain screws for reassembly Slide the fan motor assembly out of the cabinet Noting the orientation of the fan blade use a pliers to loosen and remove the fan blade retaining nut and the fan blade Retain parts for reassembly Using a wire cutter cut the two leads in a convenient location Using a 1 4 in wrench loosen and remove the two motor mounting screws and the fan motor support
22. nal leak is discovered unit replacement is required Reinstall the filter bowl when testing has been completed 3 Using a HFC 134a detector test for possible external refrigerant leaks paying particular attention to all solder joints If an external leak is discovered proceed as follows Note The service valve as illustrated in Figures 8 and 9 provides access to the evaporator for checking or servicing The service valve is a Schrader type valve with a sealing cap To use the valve unscrew the cap to expose the Schrader valve pin a Use a vacuum pump to evacuate the unit of all refrigerant into an approved refrigerant receptacle before repairing leaks b Repair any external leaks found using hard solder and flux Air Dryers A 4400 Series Technical Bulletin 17 4 Using a vacuum pump evacuate any remaining air and moisture Charge the unit with R 134a refrigerant to within 1 4 ounce of the amount specified on the air dryer nameplate 6 Remove the charging manifold and replace the cap securely on the service valve 7 Reinstall the A 4400 cover and reconnect the power supply to the air dryer 8 Ifthe evaporator pressure gauge reading plus correction does not return to normal as illustrated in Figure 5 adjust the expansion valve as described in the Refrigeration Service section Cap TT Wd MA NAA MA ATUM MM Figure 8 Service Valve Detail for Access to Evaporator 18 Air Dryers
23. period of time with a minimum amount of maintenance Note Forunits without a factory mounted Air Purification System consisting of a coalescing oil removal filter with integral pressure drop indicator packed column type activated carbon oil vapor removal filter service bypass valve pressure reducing valve safety relief valve and power on fail lamp a properly configured system must include a coalescing oil removal filter as well as an activated carbon oil vapor removal filter as outlined in Product Data A 4000 and the Installation and Service Manual for PureFlow Air Compressors Publication No 2629 Table 1 Ordering Data Flow Capacity at Air Shippin Code Rated Condition d pping Number scfm Purification Weight L s 8 0 The rated condition is 20 psig 140 kPa supply pressure 100 F 38 C saturated inlet air temperature 100 F ambient temperature and 80 psig 560 kPa inlet pressure px0 454 kg Air Dryers A 4400 Series Technical Bulletin 3 Location Unpacking the Unit Conventional Wall Mounting Arrangement Installation Procedures The A 4400 Series Refrigerated Air Dryer must be located in an open area that will permit free circulation of air through the ends of the unit The A 4400 requires 12 in 305 mm top clearance as measured from the top of the cabinet and 12 in clearance at either end When the unit is wall mounted it is recommended that there also be 10 in 254 mm
24. t cover and using a 1 4 in hex head wrench blade screwdriver secure it in place using the cover mounting screws retained in Step 2 SS Figure 12 Condenser Fan Motor Assembly 22 Air Dryers A 4400 Series Technical Bulletin Condenser Air Dryer Compressor Motor Wiring Circuit Check the condenser periodically for dust particle buildup between the fins this buildup could eventually lead to a reduction in heat transfer If there is a buildup remove it using a vacuum cleaner and a soft brush If there is power to the air dryer and the compressor is not operating using an ohmmeter and referring to Figure 13 check the electrical service as follows 1 2 Disconnect the power supply to the air dryer Remove the screw terminal from the overload at 3 and check for continuity between 3 and C1 on the overload If there is no continuity the overload may be tripped Allow 10 minutes to pass then check again If there is still no continuity the overload relay Tecumseh 830 10041 must be replaced Pull the relay off the compressor terminals keeping the relay upright and check for continuity between 1 and S1 If there is continuity the relay contacts are closed when they should be open and the relay Tecumseh 820 10052 must be replaced Check for continuity between 1 and M1 I
25. the expansion valve setting by 2 5 psig 17 5 kPa and for altitudes over 5000 ft increase the expansion valve setting by 4 0 psig 28 kPa This increase in evaporator pressure must be added to the value determined by the graph in Figure 5 to account for altitude effects Refer to the Refrigeration Service section and follow Steps 1 through 5 readjusting the expansion valve setting to properly adjust the expansion valve until the evaporator pressure gauge is at the adjusted pressure Example If X Altitude 4000 ft above sea level Ambient temperature 80 F Evaporator pressure gauge reading at no load condition 34 8 psig Then Corrected evaporator pressure 34 8 psig 2 5 psig 37 3 psig 10 Air Dryers A 4400 Series Technical Bulletin Low Ambient Temperature Compensation Evaporator Pressure psig 27 26 40 50 60 70 80 90 100 110 120 130 Ambient Temperature F Acceptable Operating Zone Nominal Setting Figure 5 Evaporator Pressure vs Ambient Temperature Sea Level No Load Condition If the air dryer is used in ambient conditions between 35 and 40 F 2 and 4 C the expansion valve must be adjusted to increase the expansion valve gauge pressure by 3 psig 21 kPa to offset a possible freeze up condition This increase in evaporator pressure must be added to the value determined by the graph in Figure 5
26. to account for low ambient temperature effects At high altitudes and low ambient temperatures it will be necessary to add both pressure corrections and readjust the expansion valve Refer to the Refrigeration Service section and follow Steps 1 through 5 readjusting the expansion valve setting to properly adjust the expansion valve until the evaporator pressure is at the adjusted pressure Operation of the A 4400 in ambient temperatures below 35 F 2 C is not recommended Note If it was necessary to adjust the expansion valve settings and position the service bypass valve to bypass the air dryer then return the service bypass valve to normal mode in order to resume operation Also if the pressures were changed from the normal settings indicate the changes on the air dryer to facilitate future service Air Dryers A 4400 Series Technical Bulletin 11 Servicing Procedures Particle Filter The A 4400 Series Refrigerated Air Dryer is equipped with an automatic condensate drain trap assembly with a particle filter The particle filter should be replaced annually or whenever the filter element appears dirty To replace the particle filter element and or automatic drain valve refer to Figure 6 and proceed as follows l Remove the service bypass valve locking pin and push the plunger to the right into the bypass position Doing so will unload the pressure in the drain bowl Turn the filter bowl counterclockwise and remove Also re
27. ttom of the unit for any necessary cleaning or replacement 4 Air Dryers A 4400 Series Technical Bulletin FB p Ei j 12 1516 Note The A 4400 requires 12 in 305 mm J 329 top clearance and 12 in clearance Ki on either end When wall mounting 7 the A 4400 10 in 254 mm bottom if clearance is recommended A L a Y Also attach the 3 8 in discharge main TET z air line to the PRV before mounting 445 A 4412 1 A 4417 1 and A 4423 1 21 3 4 22 1 16 i 552 560 i A A 4412 1 Key Slots 18 1 16 16 a yet Two Locations 46 Me 1 4 in Bail I 459 ae fy E Field Furnished EAA 1 a8 N ei FH 12 58 1A CHI ge ML vH N i5 141 4 t 1 Y i 3 2 ALL A MIT and h A 4423 1 3 H C ay g 23 3 16 thE F I 589 i Capped High Pressure Connection for High Pressure Riser Models with a Factorv Mounted Air Purification Svstem E Figure 1 A 4400 Series Refrigerated Air Dryer Shown with Optional Factory Mounted Air Purification System in
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