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Lennox
Air Conditioner
MCA Series
Lennox MCA Series Service Manual
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35
Step 4.
Removethexeddevicesoftheconnectors.
Step 5.
Disconnecttheconnectorsoffanmotor
,thestep
motorandtheT2sensor
.
Step 6.
Opentheleftsideplateofelectroniccontrolbox.
Step 7.
Openthetwoclipsonthefrontoftheelectric
box.
Step 8.
Opentheuppercoverplateofelectroniccontrol
box.
Step 9.
Remove1screwandopenthe2clipsalongthe
directionindicatedinimagebelow
.
34
36
Table of Contents
Default Chapter
1
Table of Contents
1
1 Indoor Units
3
Model Number Identification
3
Indoor Unit Specifications
3
Indoor Unit Dimensions
4
Indoor Unit Clearances
5
Indoor Unit Wall Mounts
5
2 Indoor/Outdoor Matches
6
3 Air Throw Data
6
4 Power and Communication Wiring for Systems
7
Overview
7
Wire Gauge
7
Terminal Connections
8
5 Indoor Unit Diagrams
8
6 Wireless Remote
10
Requirements
10
Remote Control Specifications
10
Function Buttons
11
Display
12
Operations
12
Start/Stop Operation
12
Select Fahrenheit or Celsius
12
Cool/Fan Mode
12
Dry Mode
12
Timer Operation
12
Timer on Operation
12
Timer off Operation
13
Modify Timer ON/OFF Settings
13
7 Connection to Centralized Controller
13
Set Indoor Unit Address for Centralized Control (Used with VRF Only)
13
Indoor Unit Connection Points for Centralized Controller
14
Dry Mode Operation - Indoor Units
14
Procedure
14
Dry Mode Operation Sequence
14
Test Run - Indoor Units
14
Test Run Instructions
14
Before Test Run
14
Double-Check Pipe Connections
15
Ambient Temperature Is Below 63°F (17°C)
15
8 Single Zone Outdoor Units
16
Model Number Identification
16
Specifications
16
Cooling Capacity
17
009 (208/230V)
17
012 (115V)
18
012 (208/230V)
18
018 (208/230V)
19
Outdoor Unit Dimensions
20
Outdoor Unit Clearances
21
Single Units
21
Multiple Units
21
9 Refrigeration Pipe Work
22
Single-Zone Refrigerant Cycle Diagram
22
Single-Zone Piping Limitations
22
10 Outdoor Unit Connections and Line Set Usage
23
Pipe Length
23
Torque Requirements
23
11 Power and Communication Wiring for Systems
24
12 Outdoor Unit Diagrams
24
13 Installation Requirements
25
Gas Leak Check With Soap Water
25
Air And Moisture
25
Air Purging Using A Vacuum Pump
25
Adding Refrigerant if Pipe Length Exceeds Charge Less Pipe Length
25
Add Refrigerant after Long-Term System Operation
25
Servicing Indoor Unit Refrigeration Circuit
26
Collecting Refrigerant Into Outdoor Unit
26
Air Purging With Vacuum Pump
26
Evacuation after Servicing the Outdoor Unit Refrigeration Circuit
26
Evacuation of the Complete Refrigeration Circuit, Indoor and Outdoor Unit
26
Refrigerant Charging
27
14 Electronic Function
27
Abbreviation
27
Electric Control Working Environment
27
15 Adding Refrigerant - Single-Zone Systems
27
16 Single-Zone Outdoor Unit LED Locations
27
17 Specifications And Operations
28
Cooling Chart
29
Capacity Request Calculations
29
Outdoor Fan Control
30
Cooling Mode
30
18 Indoor and Outdoor Unit Disassembly
32
Indoor Unit (All Models)
32
Front Panel
32
Electrical Parts
34
Evaporator
36
Fan Motor And Fan
37
Step Motor
37
Drain Hose
37
Outdoor Unit
38
Panel Plate (MWCA009S4, MWCA012S4 and MWCA018S4)
38
Panel Plate (Mwca024S4)
39
Electronic Components (MWCA009S4 and MWCA012S4)
40
Electronic Components (Mwca018S4)
40
Electronic Components (Mwca024S4)
40
Fan Disassembly (MWCA009S4 and MWCA012S4)
41
Fan Disassembly (Mwca018S4)
42
Fan Disassembly (Mwca024S4)
42
Sound Blanket
43
Compressor
43
Other manuals for Lennox MCA Series
User Guide
8 pages
Installation Instructions
20 pages
4
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Lennox MCA Series Specifications
General
Brand
Lennox
Model
MCA Series
Category
Air Conditioner
Language
English
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