Allied 4SCU18LT Series Installation And Maintenance Instructions Manual Download Page 22

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Start-Up and Performance Checklist

Job Name _____________________________

Job No. ____________

Date ___________

Job Location ___________________________

City _______________

State ___________

Installer _______________________________

City _______________

State ___________

Unit Model No. _________________________

Serial No._____________________________

Service Technician _______________________

Nameplate Voltage _____________________

Rated Load Ampacity _________ Compressor Amperage ________

Outdoor Fan __________

Maximum Fuse or Circuit Breaker ________________________

Electical Connections Tight? Indoor Filter Clean? Supply Voltage (Unit Off) __________

Indoor Blower RPM ___________________ S.P. Drop Over Indoor (Dry) ____________________

Outdoor Coil Entering Air Temperature ________ Voltage with Compressor Operating __________

Discharge Pressure __________________ Vapor Pressure ____________

Refrigerant Charge Checked? Outdoor Fan Checked?

Refrigerant Lines: Leak Checked? Properly Insulated?

Service Valves: Fully Opened? Caps Tight?

Thermostat: Calibrated? Properly Set? Level?

506254-01

Page 22 of 25

Issue 0912

Summary of Contents for 4SCU18LT Series

Page 1: ...injury death or property damage Use appropriate safety gear including safety glasses and gloves when installing this equipment WARNING Installation and servicing of air conditioning equipment can be hazardous due to internal refrigerant pressure and live electrical components Only trained and qualified service personnel should install or service this equipment Installation and service performed by...

Page 2: ...onnel and do not supersede any national or local codes in any way The installation must comply with all provincial state and local codes as well as the National Electrical Code U S or Canadian Electrical Code Canada Compliance should be determined prior to installation 4SCU18LT condensing units use R410Awhich is an ozone friendly HFC refrigerant The unit must be installed with a matching indoor co...

Page 3: ...of 2 or 2 per 5 This will prevent ice from building up under the unit during a defrost cycle Refer to following roof mounting section for barrier construction if unit must face prevailing winter winds If unit coil cannot be mounted away from prevailing winter winds a wind barrier should be constructed See Figure 3 Size the barrier at least the same height and width as the outdoor unit Mount barrie...

Page 4: ...s the diameters for line sets up to 100 although vertical lift applications and trapping requirements need to be reviewed with Technical Services for line sets over 50 Installing Refrigerant Line During the installation of an air conditioning system it is important to properly isolate the refrigerant line to prevent unnecessary vibration Line set contact with the structure wall ceiling or floor ma...

Page 5: ...e the refrigerant piping This will help to prevent oxidation and the introduction of moisture into the system 3 Use silver alloy brazing rods 5 or 6 silver alloy for copper to copper brazing or 45 silver alloy for copper to brass or copper to steel brazing which are rated for use with R410A refrigerant 4 Remove the Schrader core assemblies before brazing to protect them from damage due to extreme ...

Page 6: ...d separately and which is approved for use with R410A refrigerant in the liquid line at the indoor coil see Refrigerant Metering Device on page 9 When flushing existing line set and or indoor coil be sure to empty all existing traps Residual mineral oil can act as an insulator preventing proper heat transfer It can also clog thethermalexpansionvalve reducingsystemperformance and capacity Failure t...

Page 7: ...Figure 7 Figure 8 506254 01 Page 7 of 25 Issue 0912 ...

Page 8: ...em Refer to the gauges after shutdown to confirm that the entire system is completely void of refrigerant Disconnect the liquid and suction lines from the existing outdoor unit If the existing outdoor unit is equipped with manual shutoff valves AND new R 22 refrigerant will be used to flush the system Start the existing R 22 refrigerant system in cooling mode and close the liquid line valve Pump a...

Page 9: ... on the inverted R 22 cylinder and the gauge set valves Pump the remaining refrigerant out of the recovery machine and turn the machine off 10 Use nitrogen to break the vacuum on the refrigerant lines and indoor coil before removing the recovery machine gauges and R 22 refrigerant drum Re install pressure tap valve cores into the 4SCU18LT unit s service valves 11 Install the fixed orifice or therm...

Page 10: ...chrader Port 1 Remove the service port cap with an adjustable wrench 2 Connect gauge to the service port 3 When testing is completed replace service port cap Tighten finger tight then an additional 1 6 turn To Open Liquid or Suction Line Service Valve Remove stem cap with an adjustable wrench Use service wrench with a hex head extension to back the stem out counterclockwise as far as it will go Us...

Page 11: ...l vary with lenths Check all joints for leaks Purge nitrogen and R410A mixture Correct any leaks and rechecks Evacuation Evacuating the system of noncondensables is critical for proper operation of the unit Noncondensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system Noncondensables and water vapor combine wit...

Page 12: ...rogen cylinder with pressure regulator set to 150 psig and purge the hose Open the manifold gauge valves to break the vacuum in the line set and indoor unit Close the manifold gauge valves 7 Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder Open the manifold gauge valves to release the nitrogen from the line set and indoor unit 8 Reconnect the manifold gauge to th...

Page 13: ...s based on a matching indoor coil and outdoor coil with 15 line set For varying lengths of line set refer to Table 5 for refrigerant charge adjustment A blank space is provided on the unit rating plate to list the actual field charge Table 5 If the system is void of refrigerant clean the system using the procedure described below 1 Use dry nitrogen to pressurized the system and check for leaks Rep...

Page 14: ...e to liquid line service valve 2 Close manifold gauge set valves Connect the center manifold hose to an upright cylinder of R410A 3 If room temperature is below 70 F set the room thermostat to call for heat This will create the necessary load for properly charging the system in the cooling cycle 4 Use a digital thermometer to record the outdoor ambient temperature 5 When the heating demand has bee...

Page 15: ...ch temperature or recover refrigerant from the system to increase the approach temperature Check Charge Using Normal Operating Pressures Use Table 8 to perform maintenance checks Table 8 is not a procedure for charging the system Minor variations in these pressures may be due to differences in installations Significant deviations could mean that the system is not properly charged or that a problem...

Page 16: ... 147 344 147 348 150 363 144 105 372 148 391 149 402 151 405 148 115 413 151 438 153 456 154 447 152 High Capacity 24 36 48 60 Outdoor Coil Entering Air Temp F L S L S L S L S 65 212 137 210 141 237 137 248 123 75 254 139 247 143 286 139 293 128 85 295 142 298 145 330 140 337 132 95 337 144 349 147 374 142 382 137 105 379 146 400 149 418 144 427 142 115 424 149 451 151 462 145 471 146 506254 01 Pa...

Page 17: ...r of times consecutively pause and then repeat the process To identify a flash code number count the number of consecutive flashes Refer to Table 9 on page 18 and Table 10 on page 19 for information on the flash codes Every time the module powers up the lastALERT LED flash code that occurred prior to shutdown is displayed for 60 seconds The module will continue to display the previous flash code u...

Page 18: ...Table 9 Flash Codes 506254 01 Page 18 of 25 Issue 0912 ...

Page 19: ...Table 10 Flash Codes cont 506254 01 Page 19 of 25 Issue 0912 ...

Page 20: ...Table 11 Miswired Module Troubleshooting 506254 01 Page 20 of 25 Issue 0912 ...

Page 21: ...the unit should be gauged and refrigerant charge checked Refer to the Refrigerant Charging section on page 12 Indoor Coil 1 Clean coil if necessary 2 Check connecting lines and coils for evidence of oil leaks 3 Check condensate pan line and clean if necessary Indoor Unit 1 Clean or change filters 2 Adjust blower speed for cooling Measure the pressure drop over the coil to determine the correct blo...

Page 22: ... _________ Compressor Amperage ________ Outdoor Fan __________ Maximum Fuse or Circuit Breaker ________________________ Electical Connections Tight Indoor Filter Clean Supply Voltage Unit Off __________ Indoor Blower RPM ___________________ S P Drop Over Indoor Dry ____________________ Outdoor Coil Entering Air Temperature ________ Voltage with Compressor Operating __________ Discharge Pressure __...

Page 23: ...506254 01 Page 23 of 25 Issue 0912 WIRE DIAGRAM ...

Page 24: ...stallation date and location c an accurate description of the problem WARRANTY LIMITATIONS 1 This warranty is void if the covered equipment is removed from the original installation site 2 This warranty does not cover damage or defect resulting from a Flood wind fire lightning mold or installation and operation in a corrosive atmosphere or otherwise in contact with corrosive materials chorine fluo...

Page 25: ... lightening strike to the home or unit corrosive atmosphere contact with corrosive material Chlorine fluorine salt recycled waste water fertilizers or other damaging substances or other conditions beyond the control of Allied 2 Use of parts accessories or refrigerant not compatible with the unit 3 Modification change or alteration of the unit except as expressly directed in writing by Allied 4 Imp...

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