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MHA Series
Lennox MHA Series Service Manual
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40
Step 4.
Removethexeddevicesoftheconnectors.
Step 5.
Disconnecttheconnectorsoffanmotor
,thestep
motorandtheT2sensor
.
Step 6.
Opentheleftsideplateofelectroniccontrolbox.
Step 7.
Openthetwoclipsonthefrontoftheelectric
box.
Step 8.
Opentheuppercoverplateofelectroniccontrol
box.
Step 9.
Remove1screwandopenthe2clipsalongthe
directionindicatedinimagebelow
.
39
41
Table of Contents
Table of Contents
1
Indoor Units
3
Model Number Identification
3
Indoor Unit Specifications
3
Indoor Unit Dimensions
4
Indoor Unit Clearances
4
Indoor Unit Wall Mounts
5
Indoor/Outdoor Matches
5
Air Throw Data
6
Power and Communication Wiring for Systems
7
Overview
7
Wire Gauge
7
Terminal Connections
8
Indoor Unit Diagrams
8
Wireless Remote
9
Requirements
9
Remote Control Specifications
9
Connection to Centralized Controller
11
Set Indoor Unit Address for Centralized Control (Used with VRF Only)
11
Indoor Unit Connection Points for Centralized
12
Controller
12
Dry Mode Operation - Indoor Units
12
Procedure
12
Dry Mode Operation Sequence
13
Test Run - Indoor Units
13
Test Run Instructions
13
Before Test Run
13
Double-Check Pipe Connections
13
Ambient Temperature Is Below 63°F (17°C)
13
Single Zone Outdoor Units
15
Model Number Identification
15
Specifications
15
Cooling And Heating Capacities
16
Cooling - 009 (115V)
16
Heating - 009 (115V)
17
Cooling - 009 (208/230V)
17
Heating - 009 (208/230V)
18
Cooling - 012 (115V)
18
Heating - 012 (115V)
19
Cooling - 012 (208/230V)
19
Heating - 012 (208/230V)
20
Cooling - 018 (208/230V)
20
Heating - 018 (208/230V)
21
Cooling - 024 (208/230V)
21
Heating - 024 (208/230V)
22
Unit Dimensions
22
Outdoor Unit Clearances
23
Single Units
23
Multiple Units
24
Refrigeration Pipe Work
25
Single-Zone Refrigerant Cycle Diagram
25
Single-Zone Piping Limitations
25
Outdoor Unit Connections and Line Set Usage
26
Pipe Length
26
Torque Requirements
26
Power and Communication Wiring for Systems
27
Outdoor Unit Diagrams
28
Installation Requirements
29
Gas Leak Check With Soap Water
30
Air And Moisture
30
Air Purging Using A Vacuum Pump
30
Adding Refrigerant if Pipe Length Exceeds Charge Less Pipe Length
30
Add Refrigerant after Long-Term System Operation
30
Servicing Indoor Unit Refrigeration Circuit
31
Collecting Refrigerant Into Outdoor Unit
31
Air Purging With Vacuum Pump
31
Evacuation after Servicing the Outdoor Unit Refrigeration Circuit
31
Evacuation of the Complete Refrigeration Circuit, Indoor and Outdoor Unit
31
Refrigerant Charging
31
Electronic Function
32
Abbreviation
32
Electric Control Working Environment
32
Adding Refrigerant - Single-Zone Systems
32
Single-Zone Outdoor Unit LED Locations
32
Specifications And Operations
33
Cooling Chart
34
Heating Chart
34
Capacity Request Calculations
35
Outdoor Fan Control
36
Cooling Mode
36
Indoor and Outdoor Unit Disassembly
37
Indoor Unit (All Models)
37
Front Panel
37
Electrical Parts
39
Evaporator
41
Fan Motor And Fan
42
Step Motor
42
Drain Hose
43
Outdoor Unit
43
Panel Plate (Some Models)
43
Panel Plate (Mwha024S4)
44
Electronic Components (MWHA009S4 and MWHA012S4)
45
Electronic Components (Mwha018S4)
46
Electronic Components (Mwha024S4)
46
Fan Disassembly (MWHA009S4 and MWHA012S4)
46
Fan Disassembly (Mwha018S4)
47
Fan Disassembly (Mwha024S4)
48
Sound Blanket
49
Four-Way Valve
49
Compressor
49
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Lennox MHA Series Specifications
General
Brand
Lennox
Model
MHA Series
Category
Air Conditioner
Language
English
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