McQuay MDS300B Guía de instalación Pagina 64
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Design & installation Guide For McQuay MDS Multi System
Acceptable (CO
2
) density
Room type
Acceptable CO
2
density
L/m
3
g/kg
Place where people stay for a long time 1 1.5
Place where children and patients stay 0.7 1.0
Place where people stay
1.25 1.75
regularly (governmentagency)
Place where people stay for a short time
2 3.0
In actual practice, the fresh air volume is generally 30 m2/h person or more, no matter how much
room space a person occupies.
For densely populated buildings, such as air conditioned gymnasiums and meeting rooms, as the
room space per capita is less and every one stays shorter, the fresh air volume can be calculated on
a basis of 7–15 m2/h.person. However, as the fresh air volume got by this way will count for 30% to
40% of the total air volume and it will greatly affect the cooling capacity, you need to be careful in
deciding it.
● Supplementary of air discharge
When the air conditioned room has an exhaust system, the air conditioning system must have
corresponding fresh air volume to complement the exhaust volume. Generally, it is recom-
mended to use an exhaust volume that is 80% of the fresh air volume for comfortable air
conditioning.
● Keeping the air conditioned room in “positive pressure”
To prevent outside air (those from outdoor and adjacent rooms with less strict air conditioning
requirements) from penetrating the room and affecting the temperature/humidity or the
cleanness of the air conditioned room, the air conditioning system needs to use a certain
volume of fresh air to keep the room in “positive pressure”, that is, the atmospheric pressure
of the room is higher than that of outside). Generally, the indoor positive pressure is 5–10 Pa.
Too high positive pressure not only is a waste, but also makes the system run less cost-
effectively. In actual engineering design, the fresh air flow should count for 10% or more of the
total inlet to guarantee the air is healthy and comfortable.
■ Introduction of fresh air
● The inlet of fresh air should be at a clean place outdoor. It should be away from the air discharge
outlet and leeward to smoke, dust, and other harmful and toxic sources.
● To keep out dust, the fresh air inlet should be at least 2m above the ground, or 1m above the
ground if it is placed in a green belt.
● To introduce less hot air from outdoor in the summer, the inlet should be placed at the shade side
of the building.Generally, it is placed on the northern wall, not at the roof or on the west wall.
● Configure waterproof shutters, metal web, and air flow adjustment valves to fresh air inlet if
necessary.
● To guarantee the quality and of the introduced fresh air and the ambient temperature, do not place
the fresh air inlet near to the outdoor unit which has a condenser or put it near to the exhaust
outlet.
● Generally, the size of the fresh air inlet depends on the air volume and air speed. For the air speed,
refer to Appendix 4.
【Note】
For heat pump unit, you should consider the effects of layer height to the air conditioning effects. When the layer
height is 3m or more, you should select an appropriate air inlet to improve the air flow organization and the blown-
in air flow.
- CONTENTS 3
- Overview 4
- 1.2.3 System principle 6
- MDS080R、 MDS100BR、MDS120BR 7
- MDS150BR 7
- MDS200BR、MDS220BR、MDS240BR 8
- MDS180BR 8
- MDS280BR、MDS300BR 9
- MDS260BR 9
- 1.3 Main features 10
- 1.4 Nomenclature 12
- 1.5 Products Series 14
- 1.6 Performance Parameter 15
- 1.6.3 Ceiling cassette 16
- 1.6.5 Specification 17
- 1.6.6 Specification 18
- 1.7 Operating Range 19
- 1.8 Refnet 19
- 1.8.2 Distributor kit 20
- 1.9 Outline of Indoor Units 21
- 1.9.2 MDB050T 22
- 1.9.3 MDB060T 22
- 1.9.5 MCM020T、MCM030T、MCM050T 23
- 1.9.6 Auxiliary heating coil 24
- 1.10 Outline of Outdoor Units 25
- 1.10.3 MDS060A(R) 26
- 1.10.5 MDS150B(R) 27
- 1.10.8 MDS280B(R)、MDS300B(R) 28
- 1.10.7 MDS260B(R) 28
- Units Control 29
- 2.3.3 Wire control panel 33
- 2.3.4 Outline dimension 33
- 2.3.5 Installation type 33
- ■ concealed installation 33
- 2.5 Network Central Control 36
- 2.6 Wiring Diagram 37
- ■ Model MCK025/030/040/050T 38
- ■ MCM020/030T 38
- ■ Model MCM050T 39
- ■ Model MDB050/060T 39
- ■ Model MDS030A 40
- ■ Model MDS030AR 40
- ■ Model MDS040AR 41
- ■ Model MDS040A 41
- ■ Model MDS050A 42
- ■ Model MDS050AR 42
- ■ Model MDS060A 43
- ■ Model MDS060AR 44
- ■ Model MDS080/100/120B 45
- ■ Model MDS080/100/120BR 45
- ■ Model MDS150B 46
- ■ Model MDS150BR 46
- ■ Model MDS180B 47
- ■ Model MDS180BR 47
- ■ Model MDS200/220/240B 48
- ■ MDS200/220/240BR 48
- ■ Model MDS260BR 49
- ■ Model MDS260/280/300BR 49
- ■ Model MDS280/300BR 50
- 2.7 Wiring Diagram 51
- 2.7.3 MDS080～240B/BR 52
- 2.7.4 MDS260～300B/BR 52
- 2.8 Electrical Date 53
- Selection 54
- 3.2 Indoor unit selection 56
- 3.4 Design of Air System 60
- 3.5 Refnet joint selection 65
- For MDS-A series 66
- For MDS-B series 66
- Y type 67
- Type: MDS-Y5 67
- Type：MDS-C2、MDS-C3 68
- Type : MDS-C1 68
- Installation 69
- 4.2 Outdoor unit installation 76
- ■ MDS030～060A/AR Units 77
- ■ MDS080～300B/BR 77
- The gas must be Nitrogen 85
- 6.4mm~25.4mm 10mm or more 90
- 28.6mm~38.1mm 15mm or more 90
- （Unit: mm） 91
- 5.1.1 MDS series indoor units 100
- Address settings (SW2.1 101
- Power setting（SW3.1 —— SW3.4） 102
- Reserve 102
- ( Figure 3 ) 104
- 5.2 Trial Run 107
- Servicing and Maintenance 108
- 6.2 Servicing and Maintenance 109
- C H A P T E R 113
- WWW.MCQUAY.COM 120
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