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MDS 240B
McQuay MDS 240B User Manual
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Service Manual
SM
-MDS
_(
i
i)
89
PCB Setting Error
Error Code: ERS
E (For MD
S-M PCB)
Check whether
the outdoor PC
B is
faulty. If yes, repla
ce a new
PCB
YES
Is
t
h
e
s
e
n
s
o
r a
n
d
p
re
s
s
u
re
s
e
n
s
o
r c
o
rre
c
tly
con
n
e
c
te
d
?
NO
Correct the dipsw
itch and
restart the unit
Turn off the unit
Check the ou
tdoor
dipswitch setting,
is it correct?
6
94
96
Table of Contents
Default Chapter
4
Table of Contents
4
Preface
6
1 Introduction
7
Digital Scroll Compressor
7
Operating Range
8
Basic Layout of MDS System
9
Maximum Connectible Indoor
9
Maximum Piping Length
10
Refnet and Distributor
10
EXV Box
12
2 System and Control
13
MDS Outdoor System and Control
13
MDS Indoor System and Control
16
MDS System Piping Connection
17
Heater Control
18
Outdoor Ball Valve Operation
19
3 PCB, Handset and Wiring
20
MDS Outdoor Unit PCB
20
MDS Indoor Unit PCB
22
MDS System Wiring
24
Wiring Connection between MDS Outdoor to Indoor Units
24
Wiring Connection between MDS Outdoor Units
26
Wiring Connection between MDS Master and Slave Unit
27
Handsets for MDS System
27
Wireless Handset
28
Wired Controller MC301
30
Central Controller MC303
32
Handsets Wiring
34
4 Smart Commander
35
Introduction
35
Hardware Requirement
35
Installation of Smart Commander
35
Wiring Connection
37
Setup of Smart Commander
39
Smart Commander Software Interface
43
Circuit Monitor
43
Service Monitor
47
Additional Function
48
5 Commissioning
51
Obtain Design Drawing and Report
52
Check Piping Routing, Wiring Routing & Connection
52
Add in Additional Refrigerant
53
Confirm Indoor Dipswitch Setting
54
Power up All Indoor
56
Confirm Outdoor Dipswitch Setting
58
Setting up MDOM PCB
58
Setting up MDS-M PCB
61
Power up Outdoor
63
Start All Indoors
65
Monitor Outdoor Parameter
65
6 Troubleshooting
66
Locating Error Code
66
Error Code for Decorative Type Indoor
67
Indoor Error Code for Wired Controller MC301
69
Outdoor Error Code for MDOM PCB
74
Outdoor Error Code for MDS-M PCB
76
Troubleshooting Flow Chart
79
7 Appendix
96
Compatibility Chart for Indoor and Outdoor PCB
96
Compatibility Chart for Wired Handset MC301
97
Pressure Sensor Voltage and Resistance Value
98
Character Reference for 7 Segment LED
99
Temperature Sensor Resistance Value
100
Hardware Configuration for 5MDS Outdoor
101
R22 MDS-A Series Cooling Cycle Reference
102
R22 MDS B Series Cooling Cycle Reference
104
R22 MDS a Series Heating Cycle Reference
108
R22 MDS B Series Heating Cycle Reference
111
R410A MDS B Series Cooling Cycle Reference
115
R410A MDS B Series Heating Cycle Reference
122
R22 MDS BHC Series Cooling Cycle Reference
129
Refrigerant Circuit Diagram
133
Key Card Access Feature
161
Error Code for Phase Protector
163
5
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McQuay MDS 240B Specifications
General
Brand
McQuay
Model
MDS 240B
Category
Compressor
Language
English
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