Mitsubishi G-50A Installation Manual Page 108
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104
Notice
●
This function is only applicable to the indoor units connected to M-NET outdoor unit, but not
covering the indoor units connected to K-control outdoor unit and A-control outdoor unit.
● The indoor units under stopping or fan operation are out of the object for changeover.
When setting the [Typical air conditioner group assigning mode], the control will be
performed automatically with the [Auto-changeover mode] if the typical group is stopped
or under fan operation.
● Since the operation mode is determined by judging the status of each indoor unit
comprehensively under the [Auto-changeover mode], comfort may not be maintained at
the surrounding of the air conditioner partially. In such case, use a proper air conditioner
as the typical group under the [Typical air conditioner group assigning mode].
16.1.1 Auto-changeover mode
Under this mode, the difference of the set and inlet temperature of air conditioning groups (excluding the
group under fan operation or stopping) contained in a same changeover block is measured to assign points
to each group accordingly, and from this resultant total, the changeover mode (cooling/heating) is judged
for selection.
In order to determine the changeover mode with the consideration of a ratio of the number utilizing each air
conditioner, the points by temperature difference are weighted with the capacity value of the indoor unit.
16.1.2 Typical air conditioner group assigning mode
Judging for cooling/heating to be operated by viewing the set and inlet temperature of assigned air
conditioner groups within a changeover block for every 15 minutes, the indoor units within the changeover
block are switched over to cooling/heating for operation collectively.
When the points of each air conditioner group are multiplied with the weighting factor as below and
summed up, cooling is selected if the result stays on a positive number (over 1) while heating is selected if
it stays on a negative number (below -1).
Weighting
= Group capacity/Whole capacity
Group 1
=
9.0/46.4
.
=
.
19 (%)
Group 2
=
4.5/46.4
.
=
.
10 (%)
Group 3
=
11.6/46.4
.
=
.
25 (%)
Group 4
=
21.3/46.4
.
=
.
46 (%)
Group 1
4.5kW
7.1kW 7.1kW 7.1kW 7.1kW
4.5kW 4.5kW 4.5kW
Group 2 Group 3
Group 4
Outdoor unit
Figure 16-2 Weighting of air conditioner group
Table 16-2 Temperature difference between set and inlet temperature and points
Temperature difference between set
and inlet temperature
Set temperature Inlet temperature
Set temperature Inlet temperature
0
|
t
|
1.5
0
0
1.5
|
t
|
3.0
1 x weighting
-1 x weighting
3.0
|
t
|
2 x weighting
-2 x weighting
Temperature difference and points
Table 16-3 Temperature difference between set and inlet temperature and points
Temperature difference between set
and inlet temperature
Set temperature Inlet temperature
Set temperature Inlet temperature
0
|
t
|
1.5
Keeping present state
Keeping present state
1.5
|
t
|
Cooling operation
Heating operation
Temperature difference and points
- Mitsubishi Electric 1
- Technical Manual 1
- 1. Safety Precautions 5
- 2. Outline of product 7
- 2.1 Function 8
- (2) Function list 9
- (3) Screen image 10
- (4) Explanation of icons 11
- (1) Features 11
- (3) Function list 13
- (4) Screen images 14
- (5) Explanation of icons 15
- 2.3 Products list 17
- EU:~220V-240V; 0.25A 50Hz 18
- US:~208V-230V; 0.25A 60Hz 18
- 2.3 kg / 5 18
- 3. System Design Flow 19
- 4. Step 1: 20
- 4.3.1 M-NET transmission line 21
- 5. Step 2: 24
- 5.1.5 Synchronized settings 28
- (1) External input 29
- (1) External output 30
- Operation Block 34
- Charge Block 34
- Table 6-4 PC specifications 36
- 6.2 About password control 37
- 6.3 About LAN 38
- (3) Switching hub 39
- 6.3.3 LAN wire length 39
- 7. Step 4: 40
- (2) What is charge? 45
- (1) Basic composition 48
- (2) Required materials 48
- (3) Setting items 49
- (3) Setting item 52
- (1) Basic configuration 53
- (4) TG-2000A 56
- (1) Standard charge 59
- (2) Air conditioner charge 59
- Manual input of reading 60
- (2) Unit price 61
- (3) Charge 61
- 8.5 Output of Charging Data 62
- 8.6 Charging Method 63
- 9.1 Outline 66
- 9.2.1 Energy saving control 67
- (3) Required materials 69
- 9.2.2 Peak cut control 70
- (1) Explanation of function 70
- Stopping control is on 72
- Office A 74
- Group 1 Group 2 74
- Group 5 Group 6 74
- Group 3 Group 4 74
- (1) Measuring instruments 75
- 11.2.3 PLC assignment 80
- 11.2.4 Required materials 80
- 11.2.5 Setting of TG-2000A 81
- 12.4 PLC Software 86
- QJ71E71-100 87
- 01234567 87
- 89ABCDEF 87
- 12.6 PLC Wiring Diagram 88
- Instrument and PC for Control 89
- (1) Setting of IP address 90
- (2) Setting of subnet mask 90
- (1) Setting of dialup router 93
- (2) Network setting of G-50A 93
- Pi! Pi! 94
- (1) Switching hub 96
- (2) Optical media converter 96
- (3) Optical cable for LAN 96
- 14.1.1 Outline 97
- 14.2.1 Outline 99
- 14.2.5 Graphing trend data 103
- 15. Initial Setting Tool 104
- 15.2.2 Connection to G-50A 106
- 16. Other function 107
- 16.1.1 Auto-changeover mode 108
- Contents effective Dec. 2003 109
- ● Suwanee, Georgia 30024 110
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