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MMDB
Lennox MMDB Service Manual
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6
1.5.
M33C Indoor Unit Dimensions
GA
S
PIPE
L
IQUID
PIPE
Fresh
Air Intake
(NOTE - Not Used)
BOTTOM VIEW (Body)
SIDE VIEW
DIFFUSER
PANEL
AI
R
OUTLET
AI
R
OUTLET
AI
R
INLE
T
BOTTOM VIEW (Panel)
37-3/
8
(949)
37-3/8 (949)
5-1/
2
(139
)
4
(102
)
DRAIN
CONNECTION
32-5/8
(829)
26-3/
8
(670
)
26-3/
8
(670)
32-5/8 (829
)
30-3/8 (772)
CONTROL BOX
HANGING BRACKETS (4)
CONDENSA
TE PUMP
CONNECTION
ELECTRICAL INLET
3-7/
8
(98)
5-5/
8
(143)
A
RIGHT SIDE VIEW
LEFT SIDE VIEW
Size
A
in.
mm
024
8-1/8
206
036
9-5/8
244
048
1
1-1/4
286
5
7
Table of Contents
Table of Contents
1
Indoor Unit Information
3
M22A and M33C Cassette Non-Ducted Indoor Units
3
Model Number Identification
3
M22A Indoor Unit Specifications
3
M33C Indoor Unit Specifications
4
M22A Indoor Unit Dimensions
5
M33C Indoor Unit Dimensions
6
M22A and M33C Indoor Unit Clearances
7
M22A and M33C Indoor Unit Control Board Switches Location
8
M22A and M33C Condensate Drain Test Procedure
9
MMDB Ducted Indoor Units
10
MMDB Model Number Identification
10
MMDB Indoor Unit Specifications
11
Indoor Unit Blower Data
12
MMDB Indoor Unit Dimensions
18
MMDB Indoor Unit Clearances
19
Condensate Pump Lift - MMDB and M22A/M33C
20
MMDB Condensate Drain Test Procedure
20
MMDB Indoor Unit Gravity Drain
21
MWMC and 3WMC-036 Wall Mounted Indoor Units
22
Model Number Identification
22
Indoor Unit Specifications (009 - 012 Ton) Units
23
Indoor Unit Specifications (018 - 030 Ton) Units
23
Indoor Unit Specifications (3Wmc)
23
Indoor Unit Dimensions (Mwmc And 3Wmc)
24
Indoor Unit Clearances (All Models And Sizes)
25
MWMC and 3WMC036S4 Unit Control Board Switches Location
25
Dry Mode Operation - Mwmc And 3Wmc
26
Test Run - Mwmc And 3Wmc
26
Double-Check Pipe Connections
26
Ambient Temperature Is Below 63°F (17°C)
27
MCFA and MCFB Ceiling / Floor Indoor Units
28
Model Number Identification
28
Indoor Unit Specifications (018 - 048 Ton) Units
28
Indoor Unit Dimensions
29
Indoor Unit Clearances
30
MCFA and MCFB Indoor Unit Control Board Switches Location
31
MFMA Floor Indoor Unit
32
Model Number Identification
32
Indoor Unit Specifications (012 Ton) Unit
32
Indoor Unit Dimensions
33
Indoor Unit Clearances
33
Indoor and Outdoor Power and Communication Wiring Requirements
34
Overview
34
Wiring Guide
35
Terminal Connections
37
Wired and Wireless Remotes
39
22U49 Wireless Remote
39
22U50 Wireless Remote
39
22U52 Wireless Remote
39
M0STAT61Q-1 and M0STAT61Q-2 Wired Remotes
39
Connection to Centralized Controller, ON/OFF and Alarm Devices
40
Set Indoor Unit Address for Centralized Control (Used with VRF Only)
40
Centralized Controller
41
ON/OFF Devices
41
Alarm Devices
41
Connecting Cables
41
Outdoor Unit Information
42
Single and Multiple Zone Outdoor Units
42
Model Number Identification
42
MPC Single-Zone Specifications (0.75 - 1.5 Ton)
43
MPC Single-Zone Specifications (2 - 4 Ton)
44
3PC Single-Zone Specifications
45
MLB Single-Zone Specifications (0.75 - 2 Ton)
46
MLB Single-Zone Specifications (3 - 4 Ton)
47
MPC Multi-Zone Specifications (1.5 - 2.5 Ton)
48
MPC Multi-Zone Specifications (3 - 4 Ton)
49
MLB Multi-Zone Specifications (1.5 - 3 Ton)
50
Mlb Multi-Zone Specifications (4 Ton)
51
Single-Zone Outdoor Unit Dimensions
52
Multi-Zone Outdoor Unit Dimensions
53
Outdoor Unit Clearances
54
Indoor / Outdoor Unit Combinations
56
Mpc Multi-Zone System Combinations
56
Mlb Multi-Zone System Combinations
62
Refrigeration Pipe Work
65
Mpc And 3Pc Single-Zone Refrigerant Cycle Diagram
65
Mpc Two-Zone Refrigerant Cycle Diagram
65
Mpc Three-Zone Refrigerant Cycle Diagram
66
Mpc Four-Zone Refrigerant Cycle Diagram
66
Mpc Five-Zone Refrigerant Cycle Diagram
67
Mlb Six-Zone Refrigerant Cycle Diagram
67
Single-Zone Piping Limitations
68
Multi-Zone Piping Limitations
68
Master Valves (3 to 5 Zone Outdoor Units)
70
MPC Multi-Zone Outdoor Unit Connections and Line Set Usage
71
MLB Multi-Zone Outdoor Unit Connections and Line Set Usage
79
Power and Communication Wiring for Systems
83
Outdoor Unit Condensate Piping
84
MPC Condensate Pump Diagrams
85
Installation Requirements
86
Torque Requirements
86
Pipe Length And Elevation
86
Electronic Function
89
Abbreviations
89
Electric Control Working Environment
89
Start-Up
89
Adding Refrigerant - Single-Zone Systems
89
Adding Refrigerant - Multi-Zone Systems
90
Single-Zone Outdoor Unit LED Locations
91
Multi-Zone Outdoor Unit Leds and SW1 Locations
92
Specifications And Operations
93
Pressure on Service Port
94
Cooling Charts
94
Heating Chart
94
Capacity Request Calculations
95
Defrost Control
98
Defrost Theory
98
Defrost Termination
98
Outdoor Fan Control
99
Four-Way Valve Control
100
Electronic Expansion Valve (Exv) Control
100
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Lennox MMDB Specifications
General
Brand
Lennox
Model
MMDB
Category
Air Conditioner
Language
English
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