Lennox MCA Series Installation Instructions Manual Download Page 3

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Model Number Identification

M WC A 009 S 4 1 P

Unit Type

WC = WallMounted NonDucted Unit

Series Type

M = MiniSplit

Voltage

L = 115V1 phase60Hz

P = 208/230V1 phase60Hz

WALL-MOUNTED INDOOR UNITS

Cooling Efficiency

S = Standard Efficiency

Major Design Sequence

A = First Generation

Nominal Cooling Capacity

009 = 0.75 ton

012 = 1 ton

018 = 1.5 tons

024 = 2 tons

Refrigerant Type

4 = HFC410A

Minor Design Sequence

1 = 1st Revision

M C A 009 S 4 S 1 P

Series Type

M = MiniSplit

OUTDOOR SINGLE ZONE AIR CONDITIONER UNITS

Cooling Efficiency

S = Standard Efficiency

Major Design Sequence

A = First Generation

Nominal Cooling Capacity

009 = 0.75 ton

012 = 1 ton

018 = 1.5 tons

024 = 2 tons

Refrigerant Type

4 = HFC410A

Refrigerant Circuits

S = Single Circuit

Minor Design Sequence

1 = 1st Revision

Voltage

L = 115V1 phase60Hz

P = 208/230V1 phase60Hz

Unit Type

C = Air Conditioner

Summary of Contents for MCA Series

Page 1: ...ll unit assembly must be thoroughly cleaned following final construction clean up All mini split operating conditions must be verified ac cording to these installation instructions MCA Series Units SINGLE ZONE MINI SPLIT SYSTEM 115V and 208 230V 507879 01 6 2019 Supersedes 11 2018 Table of Contents General 1 Use of Mini Split System During Construction 1 Included Parts 2 Model Number Identificatio...

Page 2: ...nting of refrigerant CFCs HCFCs and HFCs as of July 1992 Approved methods of recovery recycling or reclaiming must be followed Fines and or incarceration may be levied for non compliance CAUTION As with any mechanical equipment contact with sharp sheet metal edges can result in personal injury Take care while handling this equipment and wear gloves and protective clothing IMPORTANT All illustratio...

Page 3: ... 1 ton 018 1 5 tons 024 2 tons Refrigerant Type 4 HFC 410A Minor Design Sequence 1 1st Revision M C A 009 S 4 S 1 P Series Type M Mini Split OUTDOOR SINGLE ZONE AIR CONDITIONER UNITS Cooling Efficiency S Standard Efficiency Major Design Sequence A First Generation Nominal Cooling Capacity 009 0 75 ton 012 1 ton 018 1 5 tons 024 2 tons Refrigerant Type 4 HFC 410A Refrigerant Circuits S Single Circu...

Page 4: ... Shown System Dimensions Outdoor Units 19 1 8 486 2 3 4 70 11 7 8 302 21 7 8 556 30 3 8 772 30 5 8 778 2 1 2 64 1 2 13 1 2 13 MCA009S4S MCA012S4S MCA081S4S BOTTOM VIEW FRONT VIEW SIDE VIEW SIDE VIEW 12 5 8 322 11 1 4 286 2 3 8 60 3 5 8 92 DRAIN HOLE bottom of unit 11 3 4 298 Figure 2 09 12K and 18K Outdoor Unit Dimen sions Inches mm MCA024S4S 27 5 8 702 BOTTOM VIEW FRONT VIEW SIDE VIEW SIDE VIEW 1...

Page 5: ...4 425 9 1 8 232 5 127 31 5 8 803 7 1 2 191 11 3 4 298 1 3 4 44 Figure 6 12K Indoor Unit Wall Plate Dimensions Inches mm MWCA018S4 Left Rear Hole 2 1 2 in 64 mm diameter Right Rear Hole 2 1 2 in 64 mm diameter 20 3 8 518 5 5 8 143 Wall Mount Unit Outline 2 1 4 57 38 965 12 1 2 318 2 1 4 57 5 3 8 137 6 3 4 171 2 3 8 60 Figure 7 18K Indoor Unit Wall Plate Dimensions Inches mm MWCA024S4 Left Rear Hole...

Page 6: ... is less than the height of the wall C the distance from the unit to the wall B must be a minimum of 12 inches 305 mm If the height of the wall C is greater than the height of the unit A the distance from the unit to the wall B must be a minimum of 20 inches 508 mm Figure 10 Multiple Outdoor Unit Clearances Inches mm Indoor Unit FRONT VIEW Wall Vertical Clearance Clearance to Floor 72 inches 1829 ...

Page 7: ...fficient space around unit for proper operation and maintenance Install unit a minimum of 3 feet 1m away from any antenna power cord line radio telephone security system or intercom Electrical interference and radio frequencies from any of these sources may affect op eration Be sure to instruct customers how to properly operate the unit especially maintenance of air filter and oper ation procedure...

Page 8: ...ided refrigerant piping connections and field provided flexible condensate piping are long enough to enable final field connections after unit is installed on wall mounting plate use field provided tape to bundle them together 3 The utility bundle may be routed out of the back of the unit or out either side If the bundle is to be routed out the back through an external wall feed the utility bundle...

Page 9: ...ht and vibration of the unit where the operation noise will not be amplified Choose a location where the hot air discharged from the unit or the operation noise will not be a nuisance to neighbors Avoid installing the outdoor unit near a bedroom or other places where noise may cause a problem There must be sufficient space to carry the unit into and out of the site There must be unobstructed air f...

Page 10: ...d installation Failure to follow this notice could result in damage to roof surface Securing Outdoor Unit to Slab Frame or Rails If the outdoor unit is installed on a field provided slab or frame use lag bolts or equivalent to secure the outdoor unit to the slab or frame Four Field provided Anchor Bolts Figure 20 Securing Outdoor Unit to Slab Four Field Provided Anchor Bolts Figure 21 Securing Out...

Page 11: ...e threaded connections with the flared refrigerant lines Tighten the flare nuts lightly at first to obtain a smooth match as illustrated in Figure 24 Making Connections Male to Female Connection Table 3 Refrigerant Piping and Indoor Unit Connection Sizes Size Btuh Liquid Line in Suction Line in 9K 1 4 3 8 12K 1 4 1 2 18K 1 4 1 2 24K 3 8 5 8 A B CANT ON THE OUTSIDE OF THE FLARE MALE FLARE CONNECTIO...

Page 12: ...l refrigerant Failure to do so may result in reduced performance Leak Test and Evacuation Air and moisture remaining in the refrigerant system will have undesirable effects as indicated below Pressure in the system rises Operating current rises Cooling or heating efficiency drops Moisture in the refrigerant circuit may freeze Water may lead to corrosion of parts in the refrigera tion system The li...

Page 13: ...es CAUTION All terminal connections must be made as illustrated in the following diagrams Improperly connected wiring could damage unit or cause communication errors between indoor and outdoor units Outdoor Unit Refer to unit nameplate for minimum circuit ampacity and maximum over current protection size Make all electrical power wiring connections at the outdoor unit Be sure to reattach all elect...

Page 14: ...Systems and Terminal Designations System Capacity System Voltage Number of Conductors Wire Type Wire Gauge MCA Indoor to Outdoor Wiring Communication Power 1 2 3 and GND 12K 115VAC 4 Stranded and unshielded 16AWG Outdoor to Main Power L N and GND 12K 115VAC 3 14AWG 15A Indoor to Outdoor Wiring Communication Power 1 2 3 and GND 09K 208 230VAC 4 16AWG 10A Indoor to Outdoor Wiring Communication Power...

Page 15: ...8 230VAC Outdoor Unit Wiring Diagram COMPRESSOR Y G DC FAN CN 7 3 BLUE BROW N BLACK 3 2 L N RED BLUE Y G 1 Y G AMBIENT TEMP SENSOR DIS CHAR GE T E MP S E NS OR CN 21 Y G Y G Y G CN4_1 CN4_2 CN4_3 CN4_4 REACTOR CAPACITOR BROWN BROWN BLACK BLACK BLACK W V RED BLUE U CN 1A CN 3 CN 1 CN 2 CN 16 CN 50 CN 30 CN 29 CN 28 OUTDOOR MAIN PCB T5 T3 T4 Figure 30 12K 115VAC Outdoor Unit Wiring Diagram ...

Page 16: ...1 2 ON 0 8 4 1 2 3 5 6 7 C 9 A B D E F 1 2 ON 0 8 4 1 2 3 5 6 7 C 9 A B D E F 1 2 ON ENC2 S1 0 F 0 F 0 F 0 F NETADDRESS CODE 0 15 16 31 32 47 48 63 FORSETTINGNETADDRESS CN10A DISPL AYBOAR D 8 Wired Controller OPTIONAL ADAPTER BOARD CN3 CN301 CN501 CN40 3 X Y E To LVM Comm Bus YELLOW BROWN RED 5 5 Programmable Wired Controller OPTIONAL 4 Note The programmable wired controller and LVM use the same p...

Page 17: ...ER CN5 INDOOR MOTOR INDOOR UNIT TO OUTDOOR UNIT CN_TIN Y G BLUE 5 WAY TERMINAL MAIN BOARD WIRING DIAGRAM 2 1 1 2 3 4 1 2 3 4 2 4 2 1 2 1 2 1 2 1 2 1 CN_L1 M 2 WHITE CN_N1 CN_S FAN CAPACITOR BOARD PC1_1 PC2_1 1 2 3 4 5 SWING MOTOR M 5 1 2 3 4 5 CN10 T1_room T2_pipe CN4 3 WHITE WHITE 3 1 2 1 2 3 0 8 4 1 2 3 5 6 7 C 9 A B D E F 1 2 ON 0 8 4 1 2 3 5 6 7 C 9 A B D E F 1 2 ON 0 8 4 1 2 3 5 6 7 C 9 A B D...

Page 18: ...rt circuit F4 Outdoor unit EEPROM parameter error F5 The outdoor fan speed is operating outside of the normal range p0 IPM malfunction or IGBT over strong current protection p1 Over voltage or over low voltage protection p2 High temperature protection of IPM module P3 Outdoor ambient temperature too low Table 8 Indoor Unit Error Codes Display Error Information p4 Inverter compressor drive error Te...

Page 19: ... is below 63 F 17 C In this instance you can use the MANUAL CONTROL button on the indoor unit to test the COOL function 1 Lift the front panel of the indoor unit and raise it until it clicks in place 2 The MANUAL CONTROL button is located on the right hand side of the unit Press it two times to select the COOL function See Figure 35 Manual Control Button 3 Perform Test Run as normal Terminal Block...

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