Armstrong Air 4SCU 16LS Series Installation And Maintenance Instructions Manual Download

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506859-01

Issue 1236

Page 1 of 32

The equipment covered in this manual is to be installed by trained and experienced

service and installation technicians. Improper installation, modification, service, or use

can cause electrical shock, fire, explosion, or other conditions which may cause personal

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

unqualified persons can result in property damage,

personal injury, or death.

WARNING

Sharp metal edges can cause injury. When installing
the unit, use care to avoid sharp edges.

WARNING

INSTALLATION AND MAINTENANCE INSTRUCTIONS

4SCU 16/18LS SERIES

Split System Air Conditioner

These instructions must be read and understood completely before attempting installation.

Risk of electrical shock. Disconnect all remote power

supplies before installing or servicing any portion of the

system. Failure to disconnect power supplies can result

in property damage, personal injury, or death.

WARNING

TABLE OF CONTENTS

INSTALLATION ....................................................2

CONNECTION DIAGRAM .....................................4

START-UP ...........................................................14

OPERATION ........................................................17

ALERT CODE ......................................................21

MAINTENANCE ..................................................26

WARRANTY ........................................................31

Manufactured By

Allied Air Enterprises, Inc.

A Lennox International Inc. Company

215 Metropolitan Drive

West Columbia, SC 29170

*P506859-01*

*p506859-01*

Summary of Contents for 4SCU 16LS Series

Page 1: ...nd service performed by unqualified persons can result in property damage personal injury or death WARNING Sharp metal edges can cause injury When installing the unit use care to avoid sharp edges WARNING INSTALLATION AND MAINTENANCE INSTRUCTIONS 4SCU 16 18LS SERIES Split System Air Conditioner These instructions must be read and understood completely before attempting installation Risk of electri...

Page 2: ...er proper refrigerant charge and proper air flow are critical to achieve rated capacity and efficiency Installation of this product should follow the manufacturer s refrigerant charging and air flow instructions Failure to confirm proper charge and airflow may reduce energy efficiency and shorten equipment life When servicing or repairing HVAC components ensure the fasteners are appropriately tigh...

Page 3: ... and refer to unit rating plate for minimum circuit ampacity and maximum overcurrent protection size Slab Mounting When installing a unit at grade level install on slab high enough above grade so that water from higher ground will not collect around the unit See Figure 2 Line voltage is present at all components when unit is not in operation on units with single pole contactors Disconnect all remo...

Page 4: ... of this document 3 Install room thermostat on an inside wall that is not subject to drafts direct sunshine or other heat sources 4 Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit See Wire Diagram on page 29 5 Do not bundle any excess 24V control wire inside control box Run control wire through installed wire tie and tighten wire tie to provide low voltage...

Page 5: ...h of wiring 18 gauge for all connections on the RSBus is 1500 feet 457 meters Wires should be color coded with a temperature rating of 95ºF 35ºC minimum and solid core Class II Rated Wiring All low voltage wiring must enter unit through provided bushing installed in electrical inlet Figure 6 ...

Page 6: ...e valve core and opening port The tube end must stay bottomed in the fitting during final assembly to ensure proper seating sealing and rigidity 7 Install the thermal expansion valve which is sold separately and which is approved for use with R410A refrigerant in the liquid line at the indoor coil see Refrigerant Metering Device on page 10 Following are some points to consider when placing and ins...

Page 7: ...rs from Table 2 to ensure that oil returns to the compressor Size vertical suction riser to maintain minimum velocity at minimum capacity Recommended line length is 50 or less If more than 50 line set is required contact Technical Services Table 2 shows the diameters for line sets up to 100 although vertical lift applications and trapping requirements need to be reviewed with Technical Services fo...

Page 8: ...506859 01 Issue 1236 Page 8 of 32 Figure 9 Figure 10 ...

Page 9: ...refrigerant from the existing system 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 ...

Page 10: ...nverted 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 4SCU16 18LS unit s service valves 11 Install the fixed orifice or thermal exp...

Page 11: ...d be rated for use with pressures 1 800 on the high side and a low side of 30 vacuum to 250 psi with dampened speed to 500 psi Gauge hoses must be rated for use at up to 800 psi of pressure with a 4000 psi burst rating Liquid and Suction Line Service Valves The liquid line and suction line service valves See Figure 13 and service ports are used for leak teating evacuation charging and checking cha...

Page 12: ...amount of refrigerant has been added for detection refrigerant requirements will 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 oper...

Page 13: ...rt hose from the vacuum pump Attach the manifold gauge center port hose to a nitrogen 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...

Page 14: ...gerant clean the system using the procedure described below 1 Use dry nitrogen to pressurized the system and check for leaks Repair leaks if possible 2 Evacuate the system to remove as much of the moisture as possible 3 Use dry nitrogen to break the vacuum 4 Evacuate the system again 5 Weigh the appropriate amount of R 410A refrigerant listed on unit nameplate into the system 6 Monitor the system ...

Page 15: ... is void of refrigerant or if the outdoor ambient temperature is cool use the weigh in method to charge the unit Do this after any leaks have been repaired 1 Recover the refrigerant from the unit 2 Conduct a leak check then evacuate as previously outlined 3 Weigh in the charge according to the total amount shown on the unit nameplate If weighing facilities are not available or if unit is being cha...

Page 16: ...rom the liquid line temperture to determine the approach temperature R 410A Temperature Pressure Chart Table 6 Subcooling Values Temp F Pressure Psig Temp F Pressure Psig Temp F Pressure Psig 32 100 8 74 214 0 116 396 0 33 102 9 75 217 4 117 401 3 34 105 0 76 220 9 118 406 7 35 107 1 77 224 4 119 412 2 36 109 2 78 228 0 120 417 7 37 111 4 79 231 6 121 423 2 38 113 6 80 235 3 122 428 8 39 115 8 81 ...

Page 17: ...h a crankcase heater it should be energized 24 hours before unit start up to prevent compressor damage as a result of slugging Emergency Heat Function Room Thermostat An emergency heat function is designed into some room thermostats This feature is applicable when isolation of outdoor unit is required or when auxiliary electric heat is stage by outdoor thermostats When the room thermostat is place...

Page 18: ...9 141 427 137 115 481 150 490 150 475 145 485 141 1st Stage Low Capacity Outdoor Coil Entering Air Temp F 4SCU18 24 4SCU18 36 4SCU18 48 4SCU18 60 L S L S L S L S 65 205 140 203 139 196 142 236 132 75 247 142 242 141 240 144 278 136 85 288 145 287 144 294 149 321 140 95 330 147 344 147 348 150 363 144 105 372 148 391 149 402 151 405 148 115 413 151 438 153 456 154 447 152 2nd Stage High Capacity Ou...

Page 19: ...506859 01 Issue 1236 Page 19 of 32 Figure 14 CONTROL BOARD ...

Page 20: ...he TEST mode During the 90 seconds start up period Fan Cycling J3 Fan cycling routine when activated will cycle the fan ON see figure 14 for five minutes if the outdoor ambient air temperature is between 15ºF and 35ºF and the compressor has been OFF for 25 to 30 minutes This option is to help reduce the potential for ice build up on the orifice ring during system OFF cycles that are greater than 2...

Page 21: ... reset E410 M oderate T he outdoor unit pressure is below the required lim it Unit pressure is below the lower lim it T he system is shutdown T he low pressure switch for HFC 410A will open at 40PSIG and close at 90PSIG Confirm that the system is properly charged with refrigerant Check T XV indoor unit blower m otor dirty filters or clogged refrigerant filter Confirm that the evaporator coil is cl...

Page 22: ...f discov ered configuration Unit nom inal capacity is displayed if not program m ed then three horizontal lines and the decim al point are displayed for 2 seconds Pow er up Reset follow ing display of nom inal capacity Fan Profile code a single or two digit num ber See table 5 for applicable fan RPM profile Pow er up Reset Unit type and num ber of stages is displayed Verify configuration with info...

Page 23: ...ollowing string is repeated if defrost is active while unit was in 1st stage heat pum p heating m ode Dehumidiﬁcation mode Shows that the unit is providing dehumidiﬁcation instead of straight cooling Following string is repeated if dehum idification is active with outdoor fan speed set at 225 RPM Diagnostic recall Shows the last 10 stored diagnostic error codes Next codes up to 10 are show using s...

Page 24: ...506859 01 Issue 1236 Page 24 of 32 Information will be displayed but does not apply to this product ...

Page 25: ...506859 01 Issue 1236 Page 25 of 32 ...

Page 26: ...r complains of insufficient cooling the nit should be gauged and refrigerant charge checked Refer to the Refrigerant Charging section on page 14 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 Before performing maintenance operations on system turn the electric power to unit OFF at disconnect swit...

Page 27: ...e cleaner If your system includes an electronic air cleaner ask your dealer for maintenance instructions Inspect and clean indoor coil The indoor evaporator coil is equipped with a drain pan to collect condensate formed as the system removes humidity from the inside air Have your dealer show you the location of the drain line and how to check for obstructions This also applies to an auxiliary drai...

Page 28: ...______ 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 ______...

Page 29: ...506859 01 Issue 1236 Page 29 of 32 4SCU16LS124 160 Wire Diagram ...

Page 30: ...506859 01 Issue 1236 Page 30 of 32 4SCU18LS124 160 Wiring Diagram ...

Page 31: ...ealer is unable to provide warranty service check online at www alliedair com 3 Be prepared to furnish the following information a complete model and serial number b proof of required periodic maintenance installation date and location and c an accurate description of the problem WARRANTY LIMITATIONS 1 This Limited Warranty is void if the covered equipment is removed from the original installation...

Page 32: ...it 3 Modification change or alteration of the unit except as expressly directed in writing by Allied Air 4 Improper use accident neglect or unreasonable use or operation of the unit including operation of electrical equipment at voltages other than the range specified on the unit nameplate 5 Operation with system parts indoor unit outdoor unit and refrigerant control devices which are not ARI matc...

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