Setting Up Mds-M Pcb - McQuay MDS Series Service Manual

5.6.2 Setting Up MDS-M PCB

Setting up MDS-M PCB is simpler and requires 3 steps as well:
1. Set up dipswitch 1 (S1)
2. Set up dipswitch 2 (S2)
3. Set up dipswitch 3 (S3)
Please refer to page 15 for the location of the dipswitches.
Set up
Dipswitch 1
(S1)
For dipswitch 1, there are 3 functions. S1.1 is to determine whether the PCB is use in the MDS-
A series or a MDS-B series. S1.2 is to determine whether the model is a cooling only model or
heatpump model. Dipswitch S1.3-S1.8 are used to determine the quantity of indoors connected
to the outdoor.
S1.1
S1.3 S1.4
S1.2
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 1
0 1
0 1
0 1
0 1
0 1
0 1
0 1
Service Manual SM-MDS_(ii)
MDS A/B
MODEL
0 MDS-B Series
1 MDS-A Series
S1.5 S1.6 S1.7 S1.8 Indoor Quantity
MODEL
0 0 0 0
0 Heatpump
0 0 0 1
0 0 1 0
1 Cooling only
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
ON (1)
S1
OFF (0)
1 2 3 4 5 6 7 8
No. of indoor units
Cooling only / Heatpump
S1.1
0
1
S1.2
0
1
S1.3 S1.4 S1.5
1 0 1
2 0 1
3 0 1
4 0 1
5 0 1
6 0 1
7 0 1
8 0 1
9 1 0
10 1 0
11 1 0
12 1 0
13 1 0
14 1 0
15 1 0
16 1 0
17 1 0
18 1 0
19 1 0
20 1 0
21 1 0
22 1 0
23 1 0
24 1 0
MODEL
MDS-B Series
MDS-A Series
MODEL
Heatpump
Cooling only
S1.6 S1.7 S1.8 Indoor Quantity
1 0 0 0 25
1 0 0 1 26
1 0 1 0 27
1 0 1 1 28
1 1 0 0 29
1 1 0 1 30
1 1 1 0 31
1 1 1 1 32
0 0 0 0 33
0 0 0 1 34
0 0 1 0 35
0 0 1 1 36
0 1 0 0 37
0 1 0 1 38
0 1 1 0 39
0 1 1 1 40
1 0 0 0 41
1 0 0 1 42
1 0 1 0 43
1 0 1 1 44
1 1 0 0 45
1 1 0 1 46
1 1 1 0 47
1 1 1 1 48
5
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