Service Instructions SSX & ASX Condensing Units and SSZ & ASZ Split System Heat Pumps with R-410A Refrigerant Blowers, Coils, & Accessories This manual is to be used by qualified, professionally trained HVAC technicians only. Goodman does not assume any responsibility for property damage or personal injury due to improper service procedures or services performed by an unqualified person. Copyright © 2006 Goodman Manufacturing Company, L.P.
IMPORTANT INFORMATION IMPORTANT INFORMATION ..................................... 2 - 3 TROUBLESHOOTING CHART ....................................... 24 PRODUCT IDENTIFICATION ...................................... 4 - 8 SERVICE TABLE OF CONTENTS ................................. 25 ACCESSORIES ........................................................ 9 - 16 SERVICING ............................................................ 26 - 61 PRODUCT DESIGN ................................................
IMPORTANT INFORMATION SAFE REFRIGERANT HANDLING While these items will not cover every conceivable situation, they should serve as a useful guide. WARNING WARNING REFRIGERANTS ARE HEAVIER THAN AIR. THEY CAN "PUSH OUT" THE TO AVOID TO AVOID POSSIBLE EXPLOSION: • NEVER APPLY FLAME OR STEAM TO A REFRIGERANT CYLINDER. IF YOU OXYGEN IN YOUR LUNGS OR IN ANY ENCLOSED SPACE. POSSIBLE DIFFICULTY IN BREATHING OR DEATH: •NEVER PURGE REFRIGERANT INTO AN ENCLOSED ROOM OR SPACE.
PRODUCT IDENTIFICATION S S Z 14 036 1 A A Minor Revision Brand Name A: Initial Release S: Goodman (High Feature Set Models) A: Amana Deluxe Major Revision A: Initial Release Product Family S: Split System Electrical 1: 208/230V/60Hz/1ph 3: 208/230V/60Hz/3ph 4: 460V/60Hz/3ph Product Type X: Condenser R-410A Z: Heat Pump R-410A Nominal Capacity SEER SEER Rating 4 018: 024: 036: 042: 048: 060: 090: 120: 1.5 tons 2 tons 3 tons 3.5 tons 4 tons 5 tons 7.
PRODUCT IDENTIFICATION MB E 8 00 A A 1 Design Series Voltage/Hz/Phase MB: Modular Blower 1: 208-230/60/1 Motor Types Design Series E: Variable-speed R: Constant-speed A: First Series Air Flow Delivered Circuit Breaker 08: 800 CFM 12: 1,200 CFM 16: 1,600 CFM 20: 2,000 CFM 2: 208/230-60-1 Factory-installed Electric Heat 00: No Heat MODEL MBR0800 MBR1200 MBR1600 MBR2000 MODEL MBE1200 MBE1600 MBE2000 MFG.
PRODUCT IDENTIFICATION C A P F 1824 A 6 A Product Type Revision C: Indoor Coil A: Revision Applicaton Refrigerant A: Upflow/Downflow Coil H: Horizontal A Coil S: Horizontal Slab Coil 6: R-22 or R-41A 4: R-410A Cabinet Finish Nominal Width for Gas Furnace U: Unpainted P: Painted C: Unpainted Case A: B: C: D: N: Expansion Device F: Flowrator Nominal Capacity Range @ 13 SEER 6 1824: 1 1/2 - 2 Tons 3030: 2 1/2 Tons 3642: 3 - 3 1/2 Tons Fits 14" Furnace Cabinet Fits 17 1/2" Furnace Cabi
PRODUCT IDENTIFICATION THIS NOMENCLATURE IS TO BE USED AFTER JULY 2006 A R U F 3642 1 6 Product Type A Minor Revision A: Single Piece Air Handler Application C: Ceiling Mount PSC Motor D: Downflow PSC Motor E: Multi-Position Variable Speed Motor R: Multi-Position PSC Motor W:Wall Mount PSC Motor Refrigerant Cabinet Finish Electrical Supply U: Unpainted P: Painted N: Uncased 1: 208-230V/60Hz/1ph Expansion Device F: Flowrator Multi-Position & Downflow Applications Nominal Capacity Range @ 13
PRODUCT IDENTIFICATION Model No.
ACCESSORIES SSX14 Model Description SSX14 018 SSX14 024 SSX14 030 SSX14 036 SSX14 042 SSX14 048 SSX14 060 X X X X X X X X X X X X X X ASC01 Anti-Short Cycle Kit X X X X CSR-U-1 Hard-start Kit X X X X CSR-U-2 Hard-start Kit CSR-U-3 Hard-start Kit 1 X FSK01A Freeze Protection Kit X TX2N4³ TXV Kit X 2 TXV Kit 2 TXV Kit TX3N4 TX5N4 1 X X X X X X Installed on indoor coil 2 Required for heat pump applications where ambient temperatures fall below 0°F wit
ACCESSORIES SSX16 SSX16 024 SSX16 030 SSX16 036 SSX16 042 SSX16 048 SSX16 060 Anti-Short Cycle Kit X X X X X X Hard-start Kit X X X X X X X X X X X X X Model Description ASC01 CSR-U-1 CSR-U-2 Hard-start Kit CSR-U-3 Hard-start Kit 1 FSK01A Freeze Protection Kit X TX2N4³ TXV Kit X TX3N4³ TXV Kit TX5N4³ TXV Kit 1 X X X X X X Installed on indoor coil 2 Required for heat pump applications where ambient temperatures fall below 0°F with 50% or higher relative hum
ACCESSORIES SSZ14 SSZ14 018 SSZ14 024 SSZ14 030 SSZ14 036 SSZ14 042 SSZ14 048 SSZ14 060 Model Description AFE18-60A All-Fuel Kit X X X X X X X ASC01 Anti-Short Cycle Kit X X X X X X X CSR-U-1 Hard-start Kit X X X X CSR-U-2 Hard-start Kit CSR-U-3 Hard-start Kit 1 X X X X X X FSK01A Freeze Protection Kit X X X X X X X OT/EHR18-60 Emergency Heat Relay kit X X X X X X X OT18-60A² Outdoor Thermostat w/ Lockout Stat X X X X X X X TX2N4³ TXV K
ACCESSORIES SSZ16 Model Description SSZ16 024 SSZ16 030 SSZ16 036 SSZ16 042 SSZ16 048 SSZ16 060 AFE18-60A All-Fuel Kit X X X X X X X X X X X X X X ASC01 Anti-Short Cycle Kit X X X CSR-U-1 Hard-start Kit X X X CSR-U-2 Hard-start Kit CSR-U-3 Hard-start Kit 1 X Freeze Protection Kit X X X X X X OT/EHR18-60 Emergency Heat Relay Kit X X X X X X OY/EH R18-60 Emergency Heat Relay Kit X X X X X X OT18-60A² Outdoor Thermostat w/ Lockout Stat X X X X
ACCESSORIES EXPANSION VALVE KITS For Applications requiring 1/4 FLARE CONNECTION BULB TO BE LOCATED AT 10 OR 2 O'CLOCK a field installed access fitting BULB SUCTION LINE EVAPORATOR COIL PISTON SEAL SUPPLIED W/ KIT SEAL SUPPLIED W/ KIT SEAL DISTRIBUTOR BODY EXPANSION VALVE TAILPIECE REMOVE BEFORE INSTALLING EXPANSION VALVE 3/8"SWEAT 7/8" NUT For Applications not requiring 1/4' FLARE CONNECTION a field installed access fitting BULB TO BE LOCATED AT 10 OR 2 O'CLOCK BULB SUCTION LINE PISTON EX
ACCESSORIES FSK01A FREEZE THERMOSTAT KIT Wire Nut Y Bl ac k Y k ac Bl Wire Nut Install Line Thermostat Here Install Line Thermostat Here Wire Nut Bla ck Y Bla ck Wire Nut Y ASC01A ANTI-SHORT -CYCLE CONTROL KIT SHORT CYCLE PROTECTOR Y1 R1 Y2 R2 YELLOW 1 CONTACTOR T2 T1 Y BLACK 1 THERMOSTAT WIRE L2 L1 C BLACK 1 14 UNIT TERMINAL BOARD
ACCESSORIES COIL ACCESSORIES COIL MODEL TX2N4 TXV KIT TX3N4 TXV KIT CA*F030B4* X CA*F036B4* X TX5N4 TXV KIT FSK01A FREEZE PROTECTION KIT X X CA*F042C4* X X CA*F048C4* X X CA*F057D4* X X CA*F060D4* X CHPF030A4* X CHPF036B4* X X X X CHPF042A4* X X CHPF048D4* X X CHPF060D4* X X X X CH36FCB X X CH48FCB CH60FCB X CA*F18246* X X X CA*F30306* X CA*F36426* X X X X X CHPF18246* X X CHPF30306* X X CHPF36426* X CSCF1824N6* X X X CSCF303N6* X CSCF3642N6*
ACCESSORIES ELECTRIC HEAT KIT APPLICATIONS - ARUF ARUF1729 1/16 ARUF1824 1/16 ARUF1931 1/16 ARUF3030 1/16 ARUF3642 1/16 ARUF3743 1/16 ARUF4860 1/16 HKR-03* X X X X X X X HKR-05*, HKR-05C* X X X X X X X HKR-06* X X X X X X X HKR-08*, HKR-08C* X1 X1 X1 X X X X HKR-10*, HKR-10C* X1 X1 X1 X1 X X X HKR-15C* X2 X2 X2 X2 X3 X3 X HKR-20C* X2 X3 X3 X HKR-21C* X2 X3 X3 X ^ HKR3-15* X2 X3 X3 X ^ HKR3-20* X2 X3 X3 X * Revision level that may or
PRODUCT DESIGN This section gives a basic description of cooling unit operation, its various components and their basic operation. Ensure your system is properly sized for heat gain and loss according to methods of the Air Conditioning Contractors Association (ACCA) or equivalent. CONDENSING UNIT The condenser air is pulled through the condenser coil by a direct drive propeller fan. This condenser air is then discharged out of the top of the cabinet.
PRODUCT DESIGN The ASX [16 & 18] and ASZ [16 & 18] series split system units use a two-stage scroll compressor. The two-step modulator has an internal unloading mechanism that opens a bypass port in the first compression pocket, effectively reducing the displacement of the scroll. The opening and closing of the bypass port is controlled by an internal electrically operated solenoid.
SYSTEM OPERATION COOLING HEATING The refrigerant used in the system is R-410A. It is a clear, colorless, non-toxic and non-irritating liquid. R-410A is a 50:50 blend of R-32 and R-125. The boiling point at atmospheric pressure is -62.9°F. The heating portion of the refrigeration cycle is similar to the cooling cycle. By energizing the reversing valve solenoid coil, the flow of the refrigerant is reversed. The indoor coil now becomes the condenser coil, and the outdoor coil becomes the evaporator coil.
SYSTEM OPERATION DEFROST CYCLE HEATING CYCLE The defrosting of the outdoor coil is jointly controlled by the defrost control board and the defrost thermostat. The ASZ and SSZ model heat pumps use a different control circuit than preceding heat pump models. These models do not use a reversing relay to energize the reversing valve. Also, many previous models energized the reversing valve off the "B" terminal on the thermostat, and all previous models energized the reversing valve in the heating cycle.
SYSTEM OPERATION COOLING CYCLE Reversing Valve (Energized) Indoor Coil Outdoor Coil Accumulator Thermostatic Expansion Valve Bi-Flow Filter Dryer Check Valve HEATING CYCLE Reversing Valve (De-Energized) Indoor Coil Outdoor Coil Accumulator Thermostatic Expansion Valve Bi-Flow Filter Dryer Check Valve 21
SYSTEM OPERATION EXPANSION VALVE/CHECK VALVE ASSEMBLY IN COOLING OPERATION EXPANSION VALVE/CHECK VALVE ASSEMBLY IN HEATING OPERATION Most expansion valves used in current Amana® Brand Heat Pump products use an internally checked expansion valve. This type of expansion valve does not require an external check valve as shown above. However, the principle of operation is the same.
SYSTEM OPERATION AFE18-60A CONTROL BOARD DESCRIPTION The AFE18 control is designed for use in heat pump applications where the indoor coil is located above/downstream of a gas or fossil fuel furnace. It will operate with single and two stage heat pumps and single and two stage furnaces. The AFE18 control will turn the heat pump unit off when the furnace is turned on. An anti-short cycle feature is also incorporated which initiates a 3 minute timed off delay when the compressor goes off.
TROUBLESHOOTING CHART COOLING/H P ANALYSIS CHART Pow er Failure Blow n Fus e Unbalanced Pow er, 3PH Loose Connec tion Shorted or Broken Wires Open Fan Ov erload Faulty Thermos tat Faulty Transf ormer Shorted or Open Capacitor Internal Compres s or Overload Open Shorted or Grounded Compress or Compress or Stuc k Faulty Compress or Contactor Faulty Fan Relay Open Control Circ uit Low V oltage Faulty Evap.
SERVICING Table of Contents S-1 S-2 S-3 S-3A S-3B S-3C S-3D S-4 S-5 S-6 S-7 S-8 S-9 S-12 S-13 S-15 S-15A S-15B S-16A S-16B S-16C S-16D S-16E S-17 S-17A S-17B S-17C S-17D S-18 S-21 S-24 Checking Voltage .......................................... 26 Checking Wiring ............................................ 26 Checking Thermostat, Wiring & Anticipator .. 26 Thermostat & Wiring ..................................... 26 Cooling Anticipator ........................................ 27 Heating Anticipator ......
SERVICING S-2 CHECKING WIRING S-1 CHECKING VOLTAGE 1. Remove outer case, control panel cover, etc., from unit being tested. With power ON: HIGH VOLTAGE! Disconnect ALL power before servicing or installing. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death. WARNING Line Voltage now present. 2.
SERVICING 4. Check the continuity of the thermostat and wiring. Repair or replace as necessary. Resistance Heaters 1. Set room thermostat to a higher setting than room temperature so both stages call for heat. element helping the thermostat call for the next cooling cycle. This prevents the room temperature from rising too high before the system is restarted. A properly sized anticipator should maintain room temperature within 1 1/2 to 2 degree range. 2.
SERVICING S-4 CHECKING TRANSFORMER AND CONTROL CIRCUIT With power ON: WARNING Line Voltage now present. HIGH VOLTAGE! Disconnect ALL power before servicing or installing. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death. A step-down transformer (208/240 volt primary to 24 volt secondary) is provided with each indoor unit. This allows ample capacity for use with resistance heaters. The outdoor sections do not contain a transformer.
SERVICING S-7 CHECKING CONTACTOR AND/OR RELAYS T2 HIGH VOLTAGE! Disconnect ALL power before servicing or installing. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death. The compressor contactor and other relay holding coils are wired into the low or line voltage circuits. When the control circuit is energized, the coil pulls in the normally open contacts or opens the normally closed contacts.
SERVICING WARNING Line Voltage now present. 4 3 OHMMETER 2 5 1 TESTING FAN RELAY 4. Using an ohmmeter, test between 2 and 4 - should read continuous . Test between 5 and 6 - should read open. 5. If not as above, replace the relay. S-12 CHECKING HIGH PRESSURE CONTROL If it cuts-out at 610 PSIG ± 10 PSIG, it is operating normally (See causes for high head pressure in Service Problem Analysis Guide). If it cuts out below this pressure range, replace the control.
SERVICING SCROLL COMPRESSOR MODELS S-15A RESISTANCE CHECK In most cases hard start components are not required on Scroll compressor equipped units due to a non-replaceable check valve located in the discharge line of the compressor. However, in installations that encounter low lock rotor voltage, a hard start kit can improve starting characteristics and reduce light dimming within the home. Only hard start kits approved by Amana® brand or Copeland should be used.
SERVICING S-15B CAPACITANCE CHECK Using a hookup as shown below, take the amperage and voltage readings and use them in the formula: 1. Remove the motor leads from its respective connection points and capacitor (if applicable). 2. Check the continuity between each of the motor leads. 3. Touch one probe of the ohmmeter to the motor frame (ground) and the other probe in turn to each lead. If the windings do not test continuous or a reading is obtained from lead to ground, replace the motor.
SERVICING 1 2 } Lines 1 and 2 will be connected for 12OVAC Power Connector applications only 3 Gnd 4 AC Line Connection 5 AC Line Connection OUT - 8 16 OUT + ADJUST +/- 7 15 G (FAN) Y1 6 14 Y/Y2 COOL 5 13 EM Ht/W2 DELAY 4 12 24 Vac (R) COMMON2 3 11 HEAT W/W1 2 10 BK/PWM (SPEED) COMMON1 1 9 O (REV VALVE) 16-PIN ECM HARNESS CONNECTOR If you do not read voltage and continuity as described, the problem is in the control or interface board, but not the motor.
- Check line voltage for variation or "sag". - Check low voltage connections (G, Y, W, R, C) at motor, unseated pins in motor harness connectors. - Check-out system controls - Thermostat. - Perform Moisture Check.* - Does removing panel or filter reduce "puffing"? - Check/replace filter. - Check/correct duct restrictions. - Adjust to correct blower speed setting. - Incorrect or dirty filter(s). - Incorrect supply or return ductwork. - Incorrect blower speed setting.
- Turn power OFF prior to repair. - Turn power OFF prior to repair. - Check for loose blower housing, panels, etc. - Check for air whistling thru seams in ducts, cabinets or panels. - Check for cabinet/duct deformation. - Does removing panel or filter reduce "puffing"? - Check/replace filter. - Check/correct duct restrictions. - Adjust to correct blower speed setting. - Loose blower housing, panels, etc. - High static creating high blower speed. - Air leaks in ductwork, cabinets, or panels.
SERVICING S-16C CHECKING ECM MOTOR WINDINGS HIGH VOLTAGE! Disconnect ALL power before servicing or installing. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death. 1. Disconnect the 5-pin and the 16-pin connectors from the ECM power head. 2. Remove the 2 screws securing the ECM power head and separate it from the motor. 3. Disconnect the 3-pin motor connector from the power head and lay it aside. 4.
SERVICING THERMOSTAT “FAN ONLY” MODE AEPF DIPSWITCH FUNCTIONS During Fan Only Operations, the CFM output is 30% of the cooling setting. Model Switch 1 Switch 2 OFF ON OFF1 OFF OFF ON CFM TRIM ADJUST AEPF1830 Minor adjustments can be made through the dip switch combination of 7-8. Table 4 shows the switch position for this feature. NOTE: The airflow will not make the decreasing adjustment in Electric Heat mode.
SERVICING S-17 CHECKING COMPRESSOR WARNING Hermetic compressor electrical terminal venting can be dangerous. When insulating material which supports a hermetic compressor or electrical terminal suddenly disintegrates due to physical abuse or as a result of an electrical short between the terminal and the compressor housing, the terminal may be expelled, venting the vapor and liquid contents of the compressor housing and system.
SERVICING 2. Identify the leads and using a Megger, Hi-Potential Ground Tester, or other suitable instrument which puts out a voltage between 300 and 1500 volts, check for a ground separately between each of the three leads and ground (such as an unpainted tube on the compressor). Do not use a low voltage output instrument such as a voltohmmeter. Unloader Test Procedure If it is suspected that the unloader is not working, the following methods may be used to verify operation. 1.
SERVICING 2. With the protective terminal cover in place, use the three leads to the compressor terminals that were disconnected at the nearest point to the compressor and connect the common, start and run clips to the respective leads. 3. Connect good capacitors of the right MFD and voltage rating into the circuit as shown. When stuck in the mid-position, part of the discharge gas from the compressor is directed back to the suction side, resulting in excessively high suction pressure.
SERVICING 3. Check the temperature at which the control opens its contacts by raising the temperature of the control. Part # 0130M00009P which is used on 2 and 2.5 ton units should open at 60°F ± 5°F. Part # 0130M00001P which is used on 3 thru 5 ton units should open at 75°F ± 6°F. 4. If not as above, replace control.
SERVICING 2.0 Heating Operation 2.1 On a demand for heat, the room thermostat energizes “W1” and 24Vac is supplied to heat sequencer, HR1, on the heater assembly. 2.2 The contacts M1 and M2 will close within 10 to 20 seconds and turn on heater element #1. The normally closed contacts on the EBTDR are also connected to terminal M1. When M1 and M2 close, the blower motor will be energized thru the normally closed contacts on the EBTDR board.
SERVICING 5.0 Defrost Operation On heat pump units, when the room thermostat is set to the heating mode, the reversing valve is not energized. As long as the thermostat is set for heating, the reversing valve will be in the de-energized position for heating except during a defrost cycle. 5.1 The heat pump will be on and operating in the heating mode as described the Heating Operation in section 4. 5.
SERVICING thermostat will remove the 24Vac from “W2” and the VSTB will remove the 24Vac from HR2. The contacts on HR2 will open between 30 to 70 seconds and heater elements #3 and #4 will be turned off and the blower motor will change to low speed. On most digital/electronic thermostats, “W2” will remain energized until the first stage demand “W1” is satisfied and then the “W1” and “W2” demands will be removed. 2.
SERVICING 5.0 DEFROST OPERATION On heat pump units, when the room thermostat is set to the heating mode, the reversing valve is not energized. As long as the thermostat is set for heating, the reversing valve will be in the de-energized position for heating except during a defrost cycle. 5.1 The heat pump will be on and operating in the heating mode as described the Heating Operation in section 4. 5.
SERVICING 2.2 HR1 contacts M1 and M2 will close within 10 to 20 seconds and turn on heater element #1. At the same time, if the heater assembly contains a second heater element, HR1 will contain a second set of contacts, M3 and M4, which will close and turn on heater element #2. Note: If more than two heater elements are on the heater assembly, it will contain a second heat sequencer, HR2, which will control the 3rd and 4th heater elements if available.
SERVICING 4.2 If a thermostat that provides a “Y2” demand in heating is used and first stage heating cannot satisfy the demand, the room thermostat will energize “Y2” and supply 24Vac to “Y/Y2” of the MBE unit. The blower motor will change to the cfm for high speed heating operation and the VSTB will supply 24Vac to “Y/Y2” at the heat pump. The outdoor fan will change to high speed operation.
SERVICING Other components such as a Heating/Cooling Thermostat and Outdoor Thermostats are available to complete the installation. The system CFM can be determined by measuring the static pressure external to the unit. The installation manual supplied with the blower coil, or the blower performance table in the service manual, shows the CFM for the static measured. Alternately, the system CFM can be determined by operating the electric heaters and indoor blower WITHOUT having the compressor in operation.
SERVICING 2. Using an ohmmeter, test across the fuse link for continuity - no reading indicates the link is open. Replace as necessary. NOTE: The link is designed to open at approximately 333°F. DO NOT WIRE AROUND - determine reason for failure. S-62 CHECKING HEATER ELEMENTS WARNING Disconnect ALL power before servicing. 1. Disassemble and remove the heating element. 2. Visually inspect the heater assembly for any breaks in the wire or broken insulators. 3.
SERVICING The equipment required to thoroughly evacuate the system is a high vacuum pump, capable of producing a vacuum equivalent to 25 microns absolute and a thermocouple vacuum gauge to give a true reading of the vacuum in the system NOTE: Never use the system compressor as a vacuum pump or run when under a high vacuum. Motor damage could occur. WARNING Do not front seat the service valve(s) with the compressor open, with the suction line of the comprssor closed or severely restricted. 1.
SERVICING NOTE: R410A should be drawn out of the storage container or drum in liquid form due to its fractionation properties, but should be "Flashed" to its gas state before entering the system. There are commercially available restriction devices that fit into the system charging hose set to accomplish this. DO NOT charge liquid R410A into the compressor. 4. With the system still running, close the valve on the charging cylinder.
SERVICING S-107 UNDERFEEDING Underfeeding by the expansion valve results in low system capacity and low suction pressures. If these symptoms are observed: COOLING HEATING TXV VALVES Some TXV valves contain an internal check valve thus eliminating the need for an external check valve and bypass loop.
SERVICING Pressure vs. Temperature Chart R-410A PSIG 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 112 °F -37.7 -34.7 -32.0 -29.4 -36.9 -24.5 -22.2 -20.0 -17.9 -15.8 -13.8 -11.9 -10.1 -8.3 -6.5 -4.5 -3.2 -1.6 0.0 1.5 3.0 4.5 5.9 7.3 8.6 10.0 11.3 12.6 13.8 15.1 16.3 17.5 18.7 19.8 21.0 22.1 23.2 24.3 25.4 26.4 27.4 28.5 29.5 30.5 31.2 32.2 33.2 34.1 35.1 35.5 36.9 PSIG 114.0 116.0 118.0 120.0 122.
SERVICING REQUIRED LIQUID LINE TEMPERATURE LIQUID PRESSURE AT SERVICE VALVE (PSIG) 189 195 202 208 215 222 229 236 243 251 259 266 274 283 291 299 308 317 326 335 345 354 364 374 384 395 406 416 427 439 450 462 474 486 499 511 8 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 112 114 116 118 120 122 124 126 128 REQUIRED SUBCOOLING TEMPERATURE (°F) 10 12 14 16 56 54 52 50 58 56 54 52 60 58 56 54 62 60 58 56 64 62 60 58 66 64 62 60 68 66 64 62 70 68 66 64 72 70 68 66 7
SERVICING EXAMPLE: 4. Review the technical information manual or specification sheet for the model being serviced to obtain the design subcooling. a. Suction Pressure = 143 b. Corresponding Temp. °F. = 50 c. Thermometer on Suction Line = 61°F. To obtain the degrees temperature of superheat, subtract 50.0 from 61.0°F. 5. Compare the hi-pressure reading to the "Required Liquid Line Temperature" chart (page 43). Find the hi-pressure value on the left column.
SERVICING b. If subcooling is low and superheat is high, add charge to raise subcooling to 5 to 7 ºF then check superheat. c. If subcooling and superheat are high, adjust TXV valve to 7 to 9 ºF superheat, then check subcooling. d. If subcooling is high and superheat is low, adjust TXV valve to 7 to 9 ºF superheat and remove charge to lower the subcooling to 5 to 7 ºF. NOTE: Do NOT adjust the charge based on suction pressure unless there is a gross undercharge. 4.
SERVICING S-112 CHECKING RESTRICTED LIQUID LINE S-115 COMPRESSOR BURNOUT When the system is operating, the liquid line is warm to the touch. If the liquid line is restricted, a definite temperature drop will be noticed at the point of restriction. In severe cases, frost will form at the restriction and extend down the line in the direction of the flow. When a compressor burns out, high temperature develops causing the refrigerant, oil and motor insulation to decompose forming acids and sludge.
SERVICING 5. Braze all joints, leak test, evacuate, and recharge system. 2. TXV Requirement: All line set applications over 50 ft will require a TXV. 6. Start up the unit and record the pressure drop across the drier. 3. Hard Start Assist- increased charge level in long line applications can require extra work from the compressor at start-up. A hard start assist device may be required to overcome this. 7.
SERVICING 4. Two-Stage Condensing Unit: The maximum length of tubing must not exceed 75 feet where indoor coil is located above the outdoor unit. NOTE: When the outdoor unit is located above the indoor coil, the maximum vertical rise must not exceed 25 feet. If the maximum vertical rise exceeds 25 feet, premature compressor failure will occur due to inadequate oil return. 5.
SERVICING Oil Trap Construction Long Radius Street Ell 45 ° Ell 45° Street Ell Short Radius Street Ell S-202 DUCT STATIC PRESSURES AND/OR STATIC PRESSURE DROP ACROSS COILS This minimum and maximum allowable duct static pressure for the indoor sections are found in the specifications section. Tables are also provided for each coil, listing quantity of air (CFM) versus static pressure drop across the coil.
SERVICING Air Flow STATIC PRESSURE DROP TOTAL EXTERNAL STATIC S-204 COIL STATIC PRESSURE DROP If the total external static pressure and/or static pressure drop exceeds the maximum or minimum allowable statics, check for closed dampers, dirty filters, undersized or poorly laid out duct work. 1. Using a draft gauge (inclined manometer), connect the positive probe underneath the coil and the negative probe above the coil. 2. A direct reading can be taken of the static pressure drop across the coil. 3.
ACCESSORIES WIRING DIAGRAMS HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
ACCESSORIES WIRING DIAGRAMS HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
ACCESSORIES WIRING DIAGRAMS HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
ACCESSORIES WIRING DIAGRAMS HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
ACCESSORIES WIRING DIAGRAMS BL 5 208 2 3 COM TR 8 240 1 9 9 8 R G 24V BL L2 4 L1 R HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
