McQuay 5MDS 50 Installation guide

Brand: McQuay

Model: 5MDS 50

Category: Split-system air conditioners

Type: Installation guide

Installation Manual

Digital Variable Multi Air Conditioner

MDS 30 – 70A(R)

MDS 80 – 320B(R)

5MDS 50 – 500B(R)

Installation Manual IM-MDS_(i) i

The data and suggestions in this document are believed current and accurate at the time of publication, but they

are not a substitute for trained, experienced and professional service. Individual applications and site variations

can significantly affect the results and effectiveness of any information, the reader must satisfy him/herself

regarding the applicability of any article and seek professional evaluation of all materials. McQuay disclaims any

responsibility for actions based on this document.

This installation manual is intended for and should only be used by qualified engineers/service

personnel. Installation and maintenance are to be performed only by qualified personnel who are familiar

with local codes and regulations, and experienced with this type of equipment.

Caution: Sharp edges and coil surfaces are a potential injury hazard. Avoid contact with them.

Warning: Moving machinery and electrical power hazard. May cause severe personnel injury

or death. Disconnect and lock off power before servicing equipment.

ii Installation Manual IM-MDS_(i)

1.0 Safety Precautions...……………………………………………………………………………....1

1.1 Precautions before installation………………………………………………..………..1

1.2 Safety reminder on installation process...……………………………………………..1

1.3 Precautions on commissioning..………………………………………………………….1

1.4 Precautions for devices that use R410A refrigerant……………………………….....1

1.5 Other precautions……...…………………………………………………………………..2

2.0 Electrical Parameter……………………………………………………………………………..2

3.0 Installation Instruction……………………………………………………………….…………..4

4.0 Outdoor Unit Installation...………………………………………………………………………...4

4.1 Location and space of installation….…………………………………………………….4

4.2 Unit handling…………….………………………………………………………………….6

4.3 Unit installation…………..…………………………………………………………………6

4.4 Installation of master and slave unit……………………………………………………..6

5.0 Indoor Unit Installation…………………………………………………………………………7

5.1 Location and space of installation...……………………………………………………..7

5.2 Installation of MEX box………………………………….………………………………...7

5.3 Installation of MCCD series indoor unit………………………………………………….8

5.4 Installation of MCKD series indoor unit …………………………...…………………….8

5.5 Installation of MCMD series indoor unit ……………………………………………….10

5.6 Installation of MWMD series indoor unit ………………………………………………12

6.0 Piping Installation…………………………………………………………………………………13

6.1 Precautions for piping installation……………………………………………………....13

6.2 Refrigerant piping system………..………………………………………………..........14

6.3 Piping size, refnet and distributor selection….………………………………………15

6.4 Installation of refrigerant piping…………………………………………………...........18

6.5 Ball valve installation and operation.…………………………………………………19

7.0 Wiring Connection……………………………………………………………………………..…20

7.1 General wiring precautions……………………………………………………………20

7.2 Wire specification…………………………………………………………………………21

7.3 Electrical wiring connection……………………………………………………………21

7.4 Communication wiring connection……………………………………………………22

7.5 Dip switch setting……………………….………………………………………………..23

7.6 Auto restart setting……………………………………….............................................24

8.0 Air Leakage Test, Vacuum and Refrigerant Charge….…………………………………..….25

8.1 Air leakage test………………………...…………………………………………………25

8.2 Vacuum……………………………………………………………………………………25

8.3 Refrigerant charge…………..……………………………………………………………25

9.0 Commissioning………………………………………...….…………………………………..….25

9.1 Checking list before commissioning....…………………………………………………25

9.2 Commissioning record table.……………………………………………………………25

9.3 Common problems during commissioning.……………………………………………25

10.0 Unit Outlines and Dimensions….…………………………………..…………………………27

Table of Content

Installation Manual IM-MDS_(i) 1

1.0 Safety Precautions

Please take note of the safety item stated below before and after the installation process:

1.1 Preparation before installation

 Check the electrical power supply condition. Power supply shall meet the requirement of local rule and

regulation.

 The tolerance of voltage shall be less than ±10% based on nominal voltage. It is not allowed to share the

same power cable through soldering as it will cause fluctuation of power supply.

 Professional technician or engineer is needed to conduct the installation.

 Follow the installation instruction in this manual. Improper installation may cause damage to the unit which

will then cause other accident to happen.

 A solid base shall be built on the ground before installation of outdoor unit. The base shall be strong enough

to support the weight of the outdoor units. Counter measure should be taken against possible natural

disaster such as earthquake and typhoon.

 Installation kits and protection kits shall be used to prevent injury.

1.2 Safety reminder on installation process

 Do not touch the fins of heat exchanger. It may cause injury. Besides that, any damage on the heat

exchanger will reduce the heat exchange performance.

 Secure the outdoor unit to avoid any vibration. The service panel and control box cover shall be closed

tightly to avoid any dirt and water from damaging the components.

 Only air filter and heater provided/approved by factory shall be installed on the indoor units.

 Action shall be taken to avoid refrigerant leakage during the installation process.

 In case of any refrigerant leakage occur, open the window and door to improve ventilation and prevent fire

hazard.

 Any electrical cable shall be kept away from water and humidity.

 Do not change any settings of the protection devices unless instructed by factory.

 Do not pull the electrical cable too tight, as it may cause the cable to break without notice.

 Ensure the cable size is correct and sufficient to support the current and power consumption.

 Unit must be earthed properly. Do not connect earth line with telephone line.

 Indoor condensing water shall be drained away properly to avoid overflow. Insulation is needed for piping

connecting to the drain pan.

 All units shall be handled and carried carefully during transportation.

 After installation completed, the unit should undergo leakage test.

1.3 Precautions on commissioning

 Power is to be supplied to the units for 12 hours before running them for the first time. This is to prevent any

damage of electrical components.

 Avoid contact with power switch when hand is wet.

 Do not remove the front panel or protection guard when the unit is in operation. The components running in

high speed may cause injury and damage.

 Do not touch the refrigerant piping when the unit is running or just stop to avoid any injury.

 Do not switch off the power supply immediately after the unit is off. Please wait for 5 minutes before shutting

down the power supply.

1.4 Precautions for devices that use R410A refrigerant

 R410A is high pressure refrigerant. Do not use refrigerant piping of other type of refrigerant to prevent burst.

 Do not use old refrigerator oil as it may contains large amount of chlorine that can cause the refrigerator oil in

R410A unit to deteriorate.

 Use refrigerant piping that is made of phosphorus deoxidized copper and copper alloy seamless pipe.

Ensure the inner and outer surfaces of the pipes are clean and free of sulphur, oxide, dust, shaving particles,

oils, moisture and other contaminant.

 Store the piping properly and keep both ends sealed until it is used to prevent dust and moisture.

 Ensure that only liquid refrigerant is charged into the system as the composition of refrigerant is different in

gaseous phase.

 Use ester oils, ether oil or small amount of alkylbenzene as the refrigerator oil to coat flares and flange

connection. Do not use mineral oil.

 Use a vacuum pump with a reverse flow check valve. The vacuum pump oil may flow back into the

refrigerant cycle and cause the refrigerator oil to deteriorate.

 Do not use refrigerant other than R410A.

 Do not use tools such as gauge manifold, charge hose and etc which are not designed for R410A refrigerant.

2 Installation Manual IM-MDS_(i)

1.5 Other precautions

 Contact local distributor/manufacturer for assistance when there’s doubt on the installation process.

 Do not charge in other type of refrigerant to the unit as this will damage the unit.

2.0 Electrical Parameter

All values given are for reference only. They shall be checked and selected to comply with local standards and

regulations.

MDS-A Series Outdoor

Model

MDS30-40A(R)

MDS50A(R)

MDS60A(R)

MDS50-60A(R)

MDS70A(R)

Power supply

(V/Ph/Hz)

220-240/1/50

380-415/3/50

Max. Breaker

Size (A)

Number of

Wires

Power Cable

Size (mm

)

MDS-B Series Outdoor

Model

MDS80B(R)

MDS100-

120B(R)

MDS150-

180B(R)

MDS200-

220B(R)

MDS240B(R)

Power supply

(V/Ph/Hz)

380-415/3/50

Max. Breaker

Size (A)

Number of

Wires

Power Cable

Size (mm

)

Model

MDS260B(R)

MDS280B(R)

MDS300B(R)

MDS320B(R)

Power supply

(V/Ph/Hz)

380-415/3/50

Max. Breaker

Size (A)

Number of

Wires

Power Cable

Size (mm

)

16 (Master) 10 (Slave)

Note: MDS 260-320B(R) is combined unit, consist of master unit and slave unit. There are two ways to connect the cable, either separate

connection or serial connection. For MDS 320, only separate connection can be used. For other combined units, it is recommended to use

serial connection.

5MDS-B Series Outdoor

Model

5MDS60B(R)

5MDS50B(R)

5MDS60-

70B(R)

5MDS80-

100B(R)

5MDS120B(R)

Power supply

(V/Ph/Hz)

220-240/1/50

380-415/3/50

Max. Breaker

Size (A)

Number of

Wires

Power Cable

Size (mm

)

Installation Manual IM-MDS_(i) 3

Model

5MDS140-160B(R)

5MDS180-200B(R)

5MDS220B(R)

5MDS240B(R)

Power supply

(V/Ph/Hz)

380-415/3/50

Max. Breaker

Size (A)

Number of

Wires

Power Cable

Size (mm

)

Model

5MDS260-

280B(R)

5MDS300B(R)

5MDS320B(R)

5MDS340-360B(R)

Power supply (V/Ph/Hz)

380-415/3/50

Max. Breaker Size (A)

Number of Wires

Power Cable

Size (mm

)

Separate

6 (Master) 10 (Slave)

10 (Master) 10 (Slave)

Serial

16 (Master) 10 (Slave)

Model

5MDS380B(R)

5MDS400B(R)

5MDS420-

460B(R)

5MDS480-500B(R)

Power supply (V/Ph/Hz)

380-415/3/50

Max. Breaker Size (A)

100

125

Number of Wires

Power Cable

Size (mm

)

Separate

16 (Master) 10 (Slave)

16 (Master) 16 (Slave)

Serial

25 (Master) 10 (Slave)

25 (Master) 16 (Slave)

Note: 5MDS 260-500B(R) is combined unit, consist of master unit and slave unit. There are two ways to connect the cable, either separate

connection or serial connection. For 5MDS 320-360B(R), only separate connection can be used. For other combined units, it is

recommended to use serial connection.

MCCD/M5CCD Series Indoor

Model

10-15C

20-25C

28-30C

38-40C

50-60C

Power supply (V/Ph/Hz)

220-240/1/50

Number of Wires

Power Cable Size (mm

)

1.5

2.5

4.0

1.5

2.5

MCKD/M5CKD Series Indoor

Model

20-25A

30A

40A

50A

10-15C

20C

Power supply (V/Ph/Hz)

220-240/1/50

Number of Wires

Power Cable Size (mm

)

2.5

4.0

1.5

2.5

1.5

2.5

MCMD/M5CMD/MCMD/M5CMD Series Indoor

Model

15-25E

28E

40D

50D

62C

Power supply (V/Ph/Hz)

220-240/1/50

Number of Wires

Power Cable Size (mm

)

2.5

4.0

1.5

2.5

MWMD/M5WMD Series Indoor

Model

09-15G

20-25G

Power supply (V/Ph/Hz)

220-240/1/50

Number of Wires

Power Cable Size (mm

)

1.5

2.5

4 Installation Manual IM-MDS_(i)

3.0 Installation Instruction

Kindly follow the installation steps shown below:

1. Choose the installation place

2. Install the outdoor and indoor unit

3. Install the piping and cable line

4. Perform leakage test

5. Vacuum the system and charge in refrigerant

6. Test run/commissioning

4.0 Outdoor Unit Installation

4.1 Location and space of installation

 Avoid the discharge air from circulating back to air inlet.

 Remove any barrier to improve the air ventilation.

 Ensure enough space for maintenance.

 Avoid installation of unit under corrosive environment.

 Avoid installation of unit at places with flammable gas.

 Follow the clearance when more than one outdoor unit is installed at the same location.

Constructing on the ground

Foundation nut installing

Many units concentrated installing

Constructing on the floor

AMDS200～240BR5

Mode

AMDS080～120BR5

AMDS140～180BR5

Drain ditch

Gradient is 1/40

Drain ditch

1900

2100

900

1200

1100

1400

Nut

Y Trough

Undercarriage

Spring washer

Bolt mode： JA

Dimension:M12

Quantity:4

MDS 30-70A(R)

5MDS 50-70B(R)

MDS 80-320B(R)

5MDS 80-500B(R)

Installation Manual IM-MDS_(i) 5

≥

≥ 45°

Front

Air Outlet Guide

≥

300mm

≥

1000mm

FRONT

BACK

FRONT

BACK

≥

450mm

≥

450mm

BACK

FRONT

BACK BACK

FRONT

BACK

≥600mm

≥

450mm

≥

900mm

MDS 30-70A(R)

5MDS 50-70B(R)

MDS 80-320B(R)

5MDS 80-500B(R)

6 Installation Manual IM-MDS_(i)

4.2 Unit handling

 Use 4 supporting points to move the units (refer to diagram).

 Avoid unstable move to prevent unit drop off.

 Do use special rope to tie the units for transportation.

 Do not touch the fin to avoid injury.

 Keep the plastic bag from reach of children.

4.3 Unit installation

 Ensure the base is solid to support the unit.

 Consider the location for drainage and piping installation.

 Screw bolt to secure the 4 corners of the unit.

 Use rubber absorber to prevent transfer of vibration.

4.4 Installation of Master and Slave unit

 Both master and slave unit must be positioned side by side and installed in the same level.

 The distance between master and slave unit shall be more than 10mm.

 Copper part accessories are packed with the outdoor units.

 All piping should be insulated.

 Gas and liquid piping should be connected paralleled to each other.

 Balance piping must be installed. It should be connected through the hole of side panel, base panel or the

piping connection position with the other outdoor unit.

 Balance piping shall be installed horizontally and it must be lower than the access valve of balance piping.

 Balance piping shall not be touching any other parts.

Installation Manual IM-MDS_(i) 7

5.0 Indoor Unit Installation

5.1 Location and space of installation

 Ensure adequate air flow for the indoor unit and no obstacle around it.

 Ensure enough space for maintenance and servicing.

 Wall or ceiling shall be strong enough to support the indoor units.

 Do not expose the unit under direct sunlight.

 Do not install the indoor unit near to places with oil, steam or flammable gas.

 Do not install the indoor unit at places with high frequency.

5.2 Installation of MEX Box

 All indoor units need to connect to MEX Box.

 It should be installed away from quiets such as bedroom.

 Ensure the MEX box is vertical when installed. The distance between

MEX box and indoor unit could not exceed the maximum length limit

of the expansion valve cable. The cable needs to be plugged on the

control board of indoor unit.

 MEX Box can be installed in any of the method shown below.

Remove the panel

For φ28.6mm gas pipe, directly

connect to Tri-joint; For φ34.9mm

gas pipe, add a reducer and a

transition pipe

Elbow

To units ball valve

Balance pipe

Liquid pipe

Gas pipe

Knock-out-hole

Piping connection position

To balance pipe

access valve

Tri-jiont

φ28.6mm a transiton pipe

(only for φ34.9mm gas pipe)

Connect pipe to

indoor units

A >10mm

B >200mm

C >500mm

D>100mm

To units ball valve

Ball valve (gas side)

Knock-out-hole

(for connecting balance pipe)

Access valve for

balance piping (φ9.52)

Knock-out-hole

Ball valve

(liquid side)

Master and slave must be

installed in the same level

steeve

nut

washer

hole for screw

washer

nut

washer

hook

SUSPENDING BY STEEVES

SCREW SETTING ON INDOOR UNIT

SCREW

SCREW SETTING ON WALL

SCREW

8 Installation Manual IM-MDS_(i)

5.3 Installation of MCCD series indoor units

 Use the hanger supplied with the unit.

 Install the unit horizontally and ensure the slope for drainage is sufficient.

 Ensure the distance between return air inlet and heat exchanger shall be at least 1m.

 Do not open the valves, connector, copper cup and cover before installation.

 Install the piping and drainage properly.

 Use selected air distributor or diffuser to meet the design requirement.

 Connect the return air inlet of indoor units with return air inlet on the ceiling.

 Both air supply and return duct shall be insulated with aluminium foil.

5.4 Installation of MCKD series indoor units

 Ensure sufficient space for ventilation and no obstacle around the indoor unit.

 The support shall carry weight 4 times larger than the indoor units to avoid unnecessary vibration and noise.

 Keep the indoor units away from source of heat and vapour.

 Use the installation template on the carton box to measure position for hanging rod. Drill the hole for the

angle nut on the ceiling and fix the hanging rod.

 Confirm the pitch of the hanging rod as per figure below.

MCKD/M5CKD-A MCKD/M5CKD-C

 Use nut and washer to fix the indoor units securely to prevent unit falling and vibration.

Installation Manual IM-MDS_(i) 9

 Adjust the unit height to 35mm (for MCKD-A) or 30mm (for MCKD-C) between the indoor unit bottom surface

and the ceiling surface.

 Confirm with a level gauge that the unit is installed horizontally.

 Open the ceiling board along the outer edge of the installation template.

 Drain pipe must be in downward gradient for smooth drainage to

prevent reversed water flow.

 When connecting the drain pipe, be careful not to exert extra force

on the drain connector at indoor unit.

 The outer diameter of the drain connection at the flexible drain hose

is 20mm.

 Ensure to apply insulation (polyethylene foam with thickness more

than 8mm) on the drain piping to avoid the condensed water dripping

inside the room.

 Connect the main drain pipe to the flexible drain hose.

 Feed water from flexible drain hose to check the piping for leakage.

When the test is completed, connect the flexible drain hose to the drain

connector on the indoor unit.

 The front panel can only be fitted in one direction, following the piping direction. (Follow piping arrow sticker

on front panel).

 Be sure to remove the installation template before installing the front panel.

 Open the air intake grille by pulling back the catchers and removing it together with filter from panel.

 Install the front frame panel onto the indoor unit by 4 screws and tighten it completely to prevent cool air

leakage.

 Connect the LED wire and air swing wire to the indoor unit.

 Install the front panel firmly to prevent cool air leakage which will cause condensation and water dripping.

drain pipe

drain & leakage test

fill water

flexible pipe

Drain pipe installation

Front panel installation

Wire connection between unit and panel

Drainage leak test

10 Installation Manual IM-MDS_(i)

 Install the air intake grille together with the air filter to the front panel.

 The grille can be fit in any direction, when selecting direction, the ceiling

design and grille operability should be considered.

 If the unit comes with ionizer filter (optional item), make sure to fix the

ionizer filter to the air filter before installing the air intake grille.

 Fix the ionizer filter to the air filter with the black side on top and white

side at bottom. Carefully clip on the ionizer filter frame.

 Note that water pump is installed in this type of indoor unit.

5.5 Installation of MCMD series indoor units

 Ensure sufficient space for ventilation and no obstacle around the indoor unit.

 Install the unit horizontally and ensure the slope for drainage is sufficient.

 Note that MCMD/M5CMD62C is unable to be installed in floor standing position.

MCMD/M5CMD-E Series

MCMD/M5CMD-C Series

MCMD/M5CMD-D Series

Slope for drainage

Installation Manual IM-MDS_(i) 11

 Ensure the overhead supports are strong enough to hold the weight of the unit.

 Position the hanger rods and check for its alignment with the unit. Also check that the hangers are secured

and the base of the indoor unit is levelled in both horizontal directions.

 Provide clearance for easy serviceability and optimal air flow.

 The unit must be installed a large distance away from the door to avoid direct sunlight.

 The location of indoor unit should be suitable for piping and drainage installation.

 The indoor unit must be installed such that there is no short circuit of cool discharge air with the warm return

air.

Air return grill

Frame

Suspending

panel

Panel side

Installation of MCMD/M5CMD-C/D Series

Installation of MCMD/M5CMD-E Series

Ceiling Type Installation

12 Installation Manual IM-MDS_(i)

5.6 Installation of MWMD series indoor units

 Ensure sufficient space for ventilation and no obstacle around the indoor unit.

 The indoor unit must be installed in such a way so as to prevent short circuit of cool discharged air with the

hot return air. Please follow the installation clearance shown below.

 Do not expose the indoor unit to direct sunlight and away from doors and windows.

 Consider the location of piping and drainage when selecting the installation space.

 The refrigerant piping can be routed to the unit in a number of ways by using the cut-out holes on the casing

of the unit.

Floor Type Installation

Installation Manual IM-MDS_(i) 13

 Ensure that the wall is strong enough to withstand the weight of the unit. Otherwise, it is necessary to

reinforce the wall with plates, beams or pillars.

 Use the level gauge for horizontal mounting and fix it with 4 suitable screws.

 In case the rear piping draws out, drill a hole 65mm in diameter with a cone drill, slightly lower on the outside

wall.

 The indoor drain pipe must be in a downward gradient for smooth drainage. Avoid situations that are likely to

cause water to leak.

 Hook the indoor unit onto the upper portion of the installation plate (engage the two hooks at the rear top of

the indoor unit with the upper edge of the installation plate).

 Ensure that the hooks are properly seated on the installation plate by moving it to the left and right.

6.0 Piping Installation

MDS system is a “one outdoor unit coupled with many indoor units” system. For piping connection, there are gas

pipe and liquid pipe connection with flare joint.

6.1 Precautions for piping installation

 Check and ensure the thickness, diameter and cleanliness of the copper tube is within specification.

 It is not allowed to vacuum the system with refrigerant.

 Do not use any detergent to clean the refrigerant piping.

 Seal the outlet of the copper tube to avoid dust, dirt or water from entering.

 Do not install the copper pipe during rainy day.

 Avoid bending and turning of piping. Special tools must be used to bend the piping.

 Use the right equipment for brazing the copper tube.

 All copper tube must be insulated to ensure heat exchange efficiency and to avoid water from condensing.

 The outdoor ball valve should remain closed until the completion of leakage test and vacuum process.

 Ensure the unit is properly charged with the correct amount of refrigerant.

14 Installation Manual IM-MDS_(i)

6.2 Refrigerant piping system

 The below 3 piping structure designs are recommended.

 It is not allowed to connect any refnet after the distributor.

balance pipe

Tee joint

Bifurcation

Indoor unit

Distributor

Indoor unit

Balance pipe

Tee joint

Distributor

Bifucation

Balance pipe

Tee joint

Indoor unit

Distributor

balance pipe

Tee joint

Indoor uint

Wrong connection

Bifurcation

Wrong connection

Installation Manual IM-MDS_(i) 15

6.3 Piping size, refnet and distributor selection

 Select the piping, refnet and distributor base on the tables and diagrams below.

Refrigerant piping

16 Installation Manual IM-MDS_(i)

R410A Piping Materials/Radial Thickness

Type

TP2M

TP2Y2

Diameter (mm)

6.4

9.5

12.7

15.9

19.1

22.2

25.4

28.6

31.8

34.9

38.1

41.3

Diameter (inch)

1/4

3/8

1/2

5/8

3/4

7/8

1-1/8

1-1/4

1-3/8

1-1/2

1-5/8

Minimum

Thickness

(mm)

0.8

1.0

1.1

1.3

1.4

1.5

 The minimum thickness of the pipe in the chart is based on the PRC Standard Specification for Drawn Tube

of Copper and Copper Alloys (GB/T1527-1997), TP2M and TP2Y2 are the marks of the material brand and

state. Using this table as reference, choose the pipe that meets the local standards and the maximum

operation pressure reaches 4.15MPa.

 If the unit is used in the environment which is eroded seriously, it should be thickened by 0.2mm.

 The table shows the minimum thickness. If the pipe needs to be bent or drawn, please add the extra

thickness appropriately.

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McQuay 5MDS 50 Installation guide

Brand: McQuay

Model: 5MDS 50

Category: Split-system air conditioners

Type: Installation guide

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McQuay 5MDS 50 Installation guide

McQuay 5MDS 50 Installation guide

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