McQuay M5RT 90 BR User manual

M5RT-B-2011
R410A Rooftop Packaged
B Series
Catalog
Models:M5RT 90BR
M5RT120BR
M5RT150BR
M5RT180BR
M5RT210BR
M5RT250BR
EC 90B
EC 120B
EC 150B
EC 180B
EC 210B
EC 250B
Economizer Kit (Option)

Nomenclature.......................................................................................................................1
- Indoor
- Outdoor
- Product Line-Up
Features...............................................................................................................................3
Application Information.........................................................................................................6
- Operating Range
- Refrigerant Circuit Diagrams
- Installation Guideline
Sound data.........................................................................................................................16
- Sound Pressure/Power Level
- NC Curve
Selection Process ..............................................................................................................20
- Variable Pitch Pulley (VPP)
- Blower Curve
Engineering and Physical Data..........................................................................................30
Performance Data..............................................................................................................35
- Calculation Steps
- Performance tables
Outlines & Dimensions.......................................................................................................48
Wiring Diagrams.................................................................................................................60
Service and Maintainance..................................................................................................68
Troubleshooting .................................................................................................................70
Part list...............................................................................................................................72
Table of Contents
Note : Installation and maintenance are to be performed only by qualied 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.
“McQuay” is a registered trademark of McQuay International. All rights reserved.
© 2011 McQuay International. All rights reserved throughout the world.
Bulletin illustrations cover the general appearance of McQuay International products at the time of publication.
We reserve the right to change design and construction specications at any time without notice.
Supersedes: M5RT-B-2010

1
Nomenclature
M RT 90 B R – F E AA
Brand
M : McQuay
Product Specification
Variation
A : First Issue
Optional Specification
E : Economizer
Model
“ ” : Cooling Only
R : Heat Pump
Electrical Characteristics
F : 50Hz / 3Ph / 380-415V
Refrigerant
“ ” : R22
4 : R407C
5 : R410A
Product Type
RT : Rooftop
Size
90 : 90,000 Btu/h
Product series
B : B Series

2
Product Line-up
M5RT-BR Series
Heat pump
Rooftop panel PCB EXV Gold Fin (NA549) Scroll compressor Saranet Air Filter Side flow Convertible Filter Drier High pressure switch Low pressure switch
90BR FEAA X X X XX X X X X X X
120BR FEAA X X X X X X X X X
150BR FEAA X X X X X X X X X
180BR FEAA X X
X
X
X
X
X
X XXXXXXX
Economizer Kit *
X
X
X
X
210BR FEAA X XXX X X X X X X X X
250BR FEAA X XXX X X X X X X X X
Heating Nomenclature
Classification
Model
M5RT
Heat pump
Variable Pitch Pulley (VPP)
X
X
X
X
X
X
* Optional accessories (field install)

3
• PackageUnit:
McQuay’s new range of rooftop packaged units has been developed specically to suit commercial applications
and are designed to be easy to install, requiring only ducting (and associated ttings), power/ control wiring
and drain piping. Along with the light grey colour, the at top and compact design gives an aesthetic and neat
appearance when installed in line of sight. The unit cabinet is made of powder coated sheet metal especially
suitable for outdoor use. All parts of the structure are fastened with corrosion resistant screws and bolts.
• BaseBeam:
The base beams are xed and provide a rigid foundation for the entire unit. The beam has the forklift slots and
rigging holes for better handling purpose. It is also designed to allow mounting on a roof curb, the dimension
of the roof curb should be followed strictly in accordance with the installation manual.
• FlexibleAirSupply:
Since all the units utilize a belt/ pulley driven supply air fan, the units are able to meet a wide range of supply
air volumes and external static pressures. Furthermore, the supply air fan motors, pulleys and belts (eld
supplied) can be easily changed on site to meet exact air ow and ESP requirement if required.
• ConvertibleReturnandSupplyAir:
Unit can be easily converted from horizontal to vertical (downward) supply and return air duct conguration
by relocating the panels and supply air fan mounting.
• ScrollCompressor:
Units are equipped with high efciency and reliable scroll compressors. Each compressor is mounted on
rubber vibration isolators in order to reduce the noise level and vibration transmissions.
• PowderCoatedCondensateDrainPan:
The sheet metal condensate drain pan is powder coated to resist corrosion.
• Slotsfor2inchesReturnAirFilters:
A 2 inches rail is provided as standard in instances where a eld supplied lter casement need to be
installed.
• HigherEnergyEfciencyRating:
The M5RT-BR series is designed in line with market requirement for better energy saving.
TechnicalSpecication
• Compressor
CompressorusedinM5RT-BR seriesPackagedUnitsare hermeticallysealedscrolltype.All thecompressors
are provided with an internal overload protection.
• Condenser
Condenser coils are manufactured from seamless inner grooved copper tubes mechanically bonded to
aluminium ns to ensure optimum heat transfer. All coils are tested against by Nitrogen holding at 609psig
and highly precise Helium leak test at 235psig.
ALL standard coils are up to 3 rows / 14-16 FPI, 3/8” (9.52mm) O.D. tubes.
Hydrophilic Gold Fin coating (NA549) is offered as standard, which has longer life span under corrosive
environment.
Features
GeneralSpecication

4
• Evaporator
Evaporator coils are manufactured from seamless inner grooved copper tubes mechanically bonded to
aluminium ns to ensure optimum heat transfer. All coils are tested against by Nitrogen holding at 609psig
and highly precise Helium leak test at 235psig.
ALL standard coils are 3-4 rows / 14-16 FPI, 3/8” (9.52mm) O.D. tubes.
Hydrophilic Gold Fin coating (NA549) is offered as standard, which has longer life span under corrosive environment.
• CondenserFanandMotor
Fans are of propeller type, direct driven by weatherproof electrical induction motors. Condenser fan motor
has class F insulation and splash-proof enclosure, IP44.
• EvaporatorFanandDrive
Blower is DWDI centrifugal, forward curved type. It is mechanically and dynamically balanced and being
mounted on a rigid shaft in a self aligned bearing block. The motor is tted with an adjustable variable pitch
pulley (VPP) drive as standard. It has class B insulation and dripping water proof, IP22.
• RefrigerantCircuit
Each refrigerant circuit shall have independent electronic expansion devices, HP/LP switch and refrigerant
line service pressure ports as standard factory installed.
• ExpansionDevice
Electronic Expansion Valve is being used to ensure accurate control of refrigerant ow.
• Casing/Structure
The unit casing used in M5RT-BR series is made of zinc coated galvanized steel sheets. It is further coated
with an electrostatic powder coat and then oven-baked for a tough and lasting weather resistant nish. Zinc
plated screws are used throughout to further reduce possibility of unit rusting.
• Insulation
ALLpossible areas of condensation to happen are insulated by PE, Polyethelene. Panel insulation is 10mm
thickness while drain pan insulation is 5mm thickness.
• Control
Units shall be completely factory supplied with an integrated controlled Module, with built in resident control
algorithms to make decide heating, cooling, or ventilating operations in response to electronic signals from
indoor & outdoor temperature sensors.
• RooftopPanel-handset
Rooftop Panel comprises all starting, operating and safety controls setting. It is connected to the IC module
PCB and supplied as standard. Standard wire length is 15 meter and it can be extended up to 100 meter.
OptionalFeatures
• 3rdPartyThermostat
For application that requires uniform thermostat outlook with other electrical appliances. 3rd Party thermostat
can be connected to the factory supplied module via the contact point available on PCB board.
• BasicBMSConnection
Unit’s standard PCB board provides dry contact for basic BMS connection. Input signal will go to dry contact
ON/OFF, COOL/HEAT, and 4 to 20 mA temperature adjuster while output signal will come from ON/OFF,
COOL/HEAT, ALARM and DEFROST dry contact.
• Economizer
Theeconomizerkit allows outside air to be mixed withreturnairfor‘free’coolingif the outdoorairtemperature
is suitable. Economizer cooling can be used alone or in conjunction with mechanical cooling. Beside that,
the economizer kit can be used as well to provide ventilation air thus can improve indoor air quality. Please
refer to the economizer kit features for more details.
• CO2Sensor
Field specied CO2sensor can be easily plug on the control board’s dry contact, which is available on the
economizer extension board.
• AuxiliaryHeater
Auxiliary heater connection point is available on the standard PCB for eld supplied heater connection.

5
EconomizerKitFeatures
Introduction
Economizer kit is an accessory provided by the factory, but requires eld installation. It is also designed to cater
for horizontal or vertical down throw air discharge orientation. Economizer kit is compatible for R410A rooftop
models. If youareunsurewhetherthiskitcanbeusedwithyourparticularunit,pleasecontactauthorized service
division. It is vital to do a correct selection on economizer kit, refer the table below for kit selection guideline:
1.Easyinstallation
-The economizer kit can be installed on all new M5RTBR-FEAARooftop series.
- No additional wiring is needed as the unit comes from factory is ready for this.
- No additional cost for standard unit, when the users do not require economizer features since
the kit is elded installed.
2.Control
- Economizer is controlled by differential temperature.
- By using certain temperature inputs, the economizer will be activated once a certain set point is
achieved
3.FreeCooling
- Economizer kit is able to provide ‘free cooling’.
- Depending on outdoor air conditions, the opening of the damper will be changed.
- The better the outdoor air conditions, the higher efciency of the unit due to lesser mechanical
cooling.
4.IndoorAirQuality
- Economizer kit is able to provide fresh air; it helps to maintain indoor air quality.
- The build-in controller is ready to be used with eld installed CO2 sensor.
- Thus, it further improves the indoor air quality.
5.Damper
- Dampers modulation are controlled by reliable spring-return motor.
- Designed with extruded aluminium blades and frame, it is always light and it has low air
leakage.
6.Filter
- Pre-ltration is used to prevent foreign objects, such as birds, stones, leaves from going into the unit.
- An additional slot is ready for secondary lter for better ltering (to be eld installed)
No.
NOTE:
1 M5RT90BR
2M5RT120BR
3 M5RT150BR
4 M5RT180BR
5 M5RT210BR
6 M5RT250BR
Wrong selection may cause the kit is unable to be assembled with the rooftop unit.
Economizer kit which is compatible with
rooftop unit
Rooftop Unit EC90B
EC120B
EC150B
EC180B
EC210B
EC250B

6
Application Information
Operating Range
The applicable operating range for unit with economizer feature same like normal unit.
However, the restriction of fresh air opening will occur in high ambient or low ambient in order to ensure the
reliability of the unit.
For high ambient in cooling operation, fresh air opening will be restricted at not more than 15%. When the
outdoor DB temperature is more than 50°C, the fresh air opening will be closed to 0%.
For low ambient in heating operation, fresh air opening will be restricted at not more than 10% to avoid cold
draft issue.
It is recommended to select an appropriate fresh air opening by considering the whole operating range of the
air-conditioner unit in both cooling and heating operation.
10 30
15
-15
-10
20
20
18
10
0
-20 27
52
50
43
40
20
10
30
0
-10 14
10 20
19 23 30
Cooling Heating
Indoor WB temperature (°C) Indoor DB temperature (°C)
Outdoor DB temperature (°C) Outdoor WB temperature (°C)
CAUTION
The use of the air conditioner outside the
range of working temperature and humidity
can result in serious failure.
Ensure the operating temperature is within the allowable range, as stated in diagram below:

7
RefrigerantCircuitDiagrams
Model: M5RT90/120/150/180/210/250BR
Cooling Operation
Heating Operation
13 12
10 11 14
15
16
17
4
3
3
29
8
1
5767
Note: (a) M5RT 120,150,180,210 & 250 consists of 2 circuits in the system.
(b) Item no. 15 & 16 are applicable for M5RT 120 only.
(c) Item no. 17 are applicable for M5RT 250 only.
Item Part’s Model/Part No/Size
1 Compressor
2 High Pressure Switch
3 Access Valve
4 4 - Ways Valve
5 Filter Drier
6 Electronic Expansion Valve
7 Strainer
8 Accumulator
9 Low Pressure Switch
10 Solenoid Valve
11 Bypass Capillary Tube
12 Indoor Heat Exchanger
13 Outdoor Heat Exchanger
14 Check Valve 1
15 Check Valve 2
16 Compensator
17 Capillary Tube
4100581, 4106124, 4100582, 4107111

8
Condenser
air outlet
3000
Condenser
air inlet
1200
1200
Blower & motor
service
Evaporator coil
& economizer
kit service
1000
Electrical control
circuit service
Compressor service
lter for economizer
kit service
lter
service
Fresh air
inlet
X
1200 X : No obstacles and no accumulation of
snow or water shall be allowed in this area.
Note 1:
Additional space or clearance is required when economizer kit is installed. Whenever the unit is equipped with
economizer kit, the space required around the unit with economizer kit shall follow the diagram below:-
Installation Clearance
Installation
Refer diagram below for the space required around the unit. Note that:-
All dimensions shown are in mm.
All space value shown are minimum clearance required for the unit.
Unit shown in the diagram is M5RT90BR. Other models shall follow the same clearance.
●
●
●
Condenser
air outlet
3000
Condenser
air inlet
1200
1200
Blower & motor
service
lter
service
Evaporator coil
service
1200
Electrical control
circuit service
Compressor service

9
M5RT 90,120, 150, 180, 210 & 250 BR
Unit Conversion
In the case of converting standard unit to downthrow unit, follow the steps as stated below:
Remove the
side panel
Remove the
Pulley Belt Detached the
blower support
Detached
blower
Remove screws
at both sides
For M5RT 90BR
The two side plates are screwed
on the blower support as shown
For M5RT 120, 150, 180, 210 & 250BR
ow structure
are screwed to blower
Cover the
horizontal supply
opening with the
blower support
that detached
from the blower
and screw tightly.
Refer Note 2.
Turn the blower to face bottom.
Screw at both sides.
Install back the pulley
belt. Adjust the belt
tension by moving the
motor base.
Cover the horizontal
return opening with the
cover and screw tightly.
Refer Note 2. Unscrew the vertical return
cover from the base panel
Remove the side
panel at return side
Lastly, install back the side panel.
Install back the pulley belt. Adjust the belt tension. Lastly, install back the side panel. Refer Note 1.
Note 1
Note 2
For downthrow conversion, belt length need to be changed.
For unit with standard pulley, belt length = a mm
Shaft to shaft distance for downthrow, C-C = b mm
M5RT90BR M5RT120BR M5RT150BR M5RT180BR M5RT210BR M5RT250BR
a 1382 1357 1250 1382 1382 1382
b 375 388 375 445 445 435
1
►►►
4
2
▼▼▼
3
◄◄◄
Sealant such like gasket (field supply) shall be placed in between the metal cover and flange. Besides that,
weather-proof silicone shall be applied on all the joints, screw holes and gaps to ensure water-tight condition.

10
Wire Connection
•All electrical work must be carried out by qualified electrician and accordance with local supply requirement
and associate regulation.
Method for connecting electric wire
Before connecting the wire, consult the electric power company of jurisdiction.
(1) The entire wiring diagram of unit
PE
ab
c
d
g
e
f
(2) Wiring connection to unit
Route the power supply wires and control wire through the knockout holes in the unit.
Remove the service panels and connect the units power supply wires to terminal block inside the control
box, as shown.
Power supply
Main switch/fuse
(field supply)
Power supply
wiring for unit
Unit
Remote control
Connection wiring for
unit & remote controller
Earth
a.
b.
c.
d.
e.
f.
g.
Note:
While installing the circuit breaker onto the unit, make sure that the screws do not damage the components
(e.g. coil) inside the unit.
The switch box also can be installed without attaching to the unit.
The knockout holes are only in M5RT90BR; M5RT120BR; M5RT150BR; M5RT180BR; M5RT210BR;
M5RT250BR comes with a power cable hole.
M5RT90BR
Recommended
switch box position
Terminal block Terminal block
(seal off the knockout holes after installation) Power cable
Control wire
Power cable
Control wire
M5RT120/150/180/210/250BR
CONTROL
BOX
CONTROL
BOX
Model Power cable
(mm2)
M5RT90BR
M5RT120BR 4 32 32 4
6 40 40 6
10 40 40 10
10 50 50 10
16 63 63 16
25 80 80 25
M5RT150BR
M5RT180BR
M5RT210BR
M5RT250BR
Wiring Example And Selection Of Circuit Breaker
Earth cable
(mm2)protection switch (A)
Over current
capacity(A)
Breaker

11
Note:
A main switch or other means for disconnection, having a contact separation in all poles, must be incorporated
in fixed wiring in accordance with local and national legislation.
•The unit is to be wired directly from an electrical distribution board either by a circuit breaker (preferred) or HRC fuse.
•Fix the power supply wiring to control module. Connect control wiring to control terminal block through the
control box’s hole.
•Earth wiring must be connected.
•The power supply cord must be equivalent to H05VV-F (60227 IEC 52 or 60227 IEC 53) which is the minimum
requirement, and to be used in protective tube.
! WARNING
•Before working in this unit, isolate it from the power supply.
•Electrical wiring to this unit and the remote controller shall be installed in accordance with the appropriate
requirement of the local wiring code.
Observe the notes mentioned below when wiring to the terminal
block. Precautions to be taken for power supply wiring.
(Use a round crimp-style terminal for connection to the terminal
block. In case it cannot be used due to unavoidable reasons, be
sure to observe the following instruction.)
When connecting the connection wires to the terminal block using a single core wire, be sure to perform curling.
Problems with the work may cause heat and fires.
CAUTION
• Pull the wire and make sure that it does not disconnect. Then fix the wire in place with a wire stop.
Stripping wire at terminal block
GoodWrong
Strip wire end
to this point. Excessive strip length
may cause electrical
shock or leakage.
Round crimp-style
terminal Stranded wire
!
Control Operation Guide
The unit is equipped with a controller main board, and a wired remote controller is connected to the controller
main board.
All the setting in the unit is preset by the manufacturer. It is not recommended to change the setting unless
necessary or mentioned below.
a) Remote Controller Location
The remote controller is located on a metal bracket behind the service panel. It is packed together with
installation manual.
RB052&012,081,051,021TRM5
Remove
panel
CONTROL
BOX
CONTROL
BOX
M5RT90BR

12
G Y1 Y2 W1 W2 Mode Operation
0 0 0 0 0 - Unit off
1 0 0 0 0 Cool Indoor fan on
X 1 0 X X Cool 1 stage compressor
X 1 1 X X Cool 2 stage compressor
X 0 X 1 0 Heatpump/Heater 1 stage compressor
X 0 X 1 1 Heatpump/Heater 2 stage compressor
Remark: X = Don’t care.
ON
OFF
b) LED Display (Controller Main Board)
The LED will blink when power up the unit.
c) LCD Display (Remote Controller)
During normal operations, the LCD displays compressor on/off status, mode, set temperature and so on.
Refer to Operating Manual for the details of operation guide. The LCD will display the main screen upon
power-up. When malfunctioning occur, a pop-up message will appear on the LCD with backlight blinking
and ‘beep’ sound.
d) Optional Confi gurations
The controller main board can be used as the interface for thermostat control and BMS system.
(i) Thermostat control (TB_THM-I)
• To use this control, set Dip Switch Setting: SW1-ON (default is OFF).
• Follow the method below for thermostat control inputs:
• Refer table below for installation recommendations:
Input Rated voltage Rated current Wire size
G
24V AC 5mA AWG18~22
Y1
Y2
W1
W2
Input TB_BMS-I Rated voltage Rated current Wire size
24V AC 5mA AWG18~22Operating mode 24V AC 5mA
Cool/Heat set point - 4~20mA
1 2 3 4 5 6 7 8
ON
OFF
Note:
• When the controller main board is confi gured as thermostat control, the remote controller is used for
monitoring purpose only.
• Unit needs to be restarted (power off and on) whenever dip switch setting is changed.
Note:
• When the controller main board is confi gured as BMS control, the remote controller is used for
monitoring purpose only.
• Unit needs to be restarted (power off and on) whenever dip switch setting is changed.
Note:
• G8 = Control Type
0 = Panel
1 = BMS
(ii) BMS control (TB_BMS-I)
• To use this control, set Dip Switch Setting: SW3 - ON (default is OFF) and panel parameter G8 to ‘1’
(default is ‘0’).
(iii)Dry contact output (TB_BMS-O)
• For TB_BMS-O, there are 4 monitoring outputs: error alarm; output1; output2; and defrost signal.
• Refer table below for installation recommendations:
• For TB_BMS-I, there are 3 control inputs:
unit on/off ; operating mode (cool-0/heat-1); and set point (4~20mA).
• Refer below table for installation recommendations:
eziseriW)A(tnerrucdetaRegatlovdetaRO-SMB_BTtupnI
Alarm output (AL) 230V AC/125V AC/30V DC 1/3/3
AWG18~22
3/3/2)1O(1tuptuO 3/3/3)2O(2tuptuO
Defrost signal (DFRT) 230V AC/125V AC/30V DC 4/3/3
230V AC/125V AC/30V DC
230V AC/125V AC/30V DC
• The output signals will vary depending on the confi guration of controller main board, whether it is
thermostat control or BMS control.

13
(1) For thermostat control, the outputs are summarized as below:
(2) For BMS control, the outputs are summarized as below:
Output 1*
OFF OFF OFF mode
FAN mode
COOL mode
HEAT mode
OFF
ON
ON
OFF
ON
ON
Output Status
Output 2* Description of operation
Output statusOutput
Output
Output 1 ON ON mode
OFF mode
HEAT mode
COOL mode
System defrosting
Normal
Alarm occurred
No alarm occurred
OFF
ON
OFF
ON
OFF
ON
OFF
Output 2
Defrost
Alarm
Output status
System defrosting
Normal
Alarm occurred
No alarm occurred
OFF
OFF
ON
ON
Defrost
Alarm
* Output 1 = ON/OFF
* Output 2 = COOL/HEAT
Description of operation
Description of operation
The diagram below shows the position for terminal blocks in the controller main board which are used for
thermostat control and BMS system. Beside that, the output pins for auxilliary electrical heater are shown
as well.
Thermostat Control (TB_THM-l)
Connect to
third party
controller
BMS System (TB_BMS-l)
Connect to
BMS
System
Dry Contact Outputs (TB_BMS-O)
Controller Main Board
Alarm
output
(AL)
Output
1 (O1)
Output
2 (O2)
Defrost
signal
(DFRT)
Heater Output (HTR1 and HTR2)
Connect to
heater
contactor
Connect to
heater
contactor
Unit
on/
Cool/
Heat
mode
select
Cool/
Heat
set
point
Supply
Voltage
24V AC
Thermostat control
inputs
(G, Y1, Y2, W1, W2)

14
(iv) Auxilliary Electrical Heater Output (HTR1 and HTR2)
• There are two output pins (HTR1 and HTR2) on controller main board, which are used to energize
the heater contactor. The contactor must be selected accordingly to avoid any safety issue(s).
• The heater shall be installed in accordance with local and national legislation. It must comply with
EN60335-2-40.
• Thermal fuse(s) shall be installed on the heater to eliminate any danger or damage on the
heater/unit. This is especially critical when there is any malfunction happen to controller main board
or blower.
• The heater shall be in a safe location, whereby no risk of damage could be happen on the unit.
• Use non-flammable duct for the unit that is installed with heater
• Use diff erent power supply for electrical heater and install a circuit breaker for each of the heater.
• Maximum temperature in the unit must not exceed 60°C. Temperature measurement shall be taken
during the installation or commisioning in order to ensure the temperature not exceed this value.
• Select the proper safety device or thermal protector accordingly.
• The heater shall never be installed inside the unit. The recommended location for the heater is inside
the supply duct, whereby the distance of the heater is suffi cient to ensure the temperature inside the
unit does not exceed 60°C.
(v) Economizer control
• Ensure the economizer kit has been incorporated with rooftop unit before activate the economizer
function in the controller main board. Else, error will occur.
• To activate economizer function, set Dip Switch Setting: SW4 - ON (default is OFF) in the controller main
board and panel parameter G6 to ‘1’ (default is ‘0’).
• In economizer controller board, there are 4 dip switches and 3 shunt jumpers which provide flexible
selection based on different requirements:
– Dip Switch 1: Minimum fresh air opening setting in heating mode, where by the selection of
different pins will give different opening setting. SW1: 5%, SW2: 10%, SW3: 15%,
SW4: 20%, SW5: 25%, SW6/7/8:
no function, Default: 0% (no selection, all OFF).
– Dip Switch 2: Minimum fresh air opening setting in cooling mode, where by the selection of
different pins will give different opening setting. SW1: 0%, SW2: 5%, SW3: 15%,
SW4: 20%, SW5: 25%, SW6/7/8:
no function, Default: 10% (no selection, all OFF).
– Dip Switch 3: CO2 PPM level threshold value selection, where by the selection of different pins
will give different value setting. SW1: 25%, SW2: 50%, SW3: 75%, SW4: 100%,
Default: 0% (no selection, all OFF).
– Dip Switch 4: Type of operation, which include the following selection:-
SW1: OFF = Differential temperature operation (default), ON = No function at this
moment.
SW2: OFF = Economizer mode (default), ON = Fresh air mode.
SW3: OFF = Overcooled protection is not activated (default), ON = Overcooled
protection is activated.
1 2 3 4 5 867
ON
OFF
Note:
G6 = Economizer control
0 = disable
1 = enable.

15
Shunt jumper 1, 2 and 3: Minimum fresh air opening setting in fan mode, where by the selection of
different pins will give different opening setting. Let name the shunt jumper 1 = JP1, shunt jumper 2
= JP2 and shunt jumper 3 = JP3; refer the table below for different fresh air opening selection:-
Fresh air opening (%) JP1 JP2 JP3
0 (default) OFF OFF OFF
10 OFF OFF ON
20 OFF ON OFF
30 OFF ON ON
40 ON OFF OFF
50 ON OFF ON
70 ON ON OFF
85 ON ON ON
Legend: OFF = Short pin 2 and pin 3
ON = Short pin 1 and pin 2
CAUTION
Dip Switch 1, 2 and 3 allow only 1 pin selection. Multiple pins selection will cause error and the operation will go
back to default setting. While Dip Switch 4 allow multiple pins selection.
Location of dip switches and shunt jumpers
in the economizer controller board: Indication on the economizer controller board:
Shunt jumper 1
Shunt jumper 2 Shunt jumper 3
Dip Switch 3 Indication for the
means of selection
for Dip Switch 1.
Indication for the
means of selection
for Dip Switch 3.
Indication for the
means of selection
for Dip Switch 2.
Indication for the
means of selection
for Dip Switch 4.
Dip Switch 4
Dip Switch 2
Dip Switch 1
Indication for the means of selection for shunt
jumper 1, 2 and 3.

16
Sound Data
Outdoor Noise Level
Coil
Mic. position 1
Mic. position 2 Mic. position 3
Discharge air flow
Note:- Microphone position: 1m away from every side of the unit and 1m above floor level
63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz
M5RT90BR 77 76 64 65 63 60 55 48
78 75 62 60 59 54 50 44 64 65
77 74 61 60 61 54 52 45 65 63
78 82 66 63 63 56 51 45 68 73
85 76 69 66 65 61 53 46 70 66
83 74 70 66 65 62 56 47 70 68
68 66
M5RT120BR
M5RT150BR
M5RT180BR
M5RT210BR
M5RT250BR
M5RT90BR
M5RT120BR
M5RT150BR
M5RT180BR
M5RT210BR
M5RT250BR
63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz
91 91 79 78 78 72 68 61 82
96 91 79 78 80 72 70 64 83
93 90 79 78 80 73 71 64 83
95 96 83 82 84 78 73 66 87
101 94 87 85 87 81 76 69 90
99 91 88 85 86 83 77 69 90
Model 1/1 Octave Sound Power Level (dB, ref 1pW) Overall
(dBA)
Noise Criteria
(NC)
1/1 Octave Sound Pressure Level (dB, ref 20µPa)
Model Overall
(dBA)
0152213B
0252213B

17
M5RT90BR NC CURVES
M5RT120BR NC CURVES
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20μPa)
NC70
NC45
NC50
NC55
NC60
NC65
NC20
NC25
NC30
NC35
NC40
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20μPa)
NC70
NC45
NC50
NC55
NC60
NC65
NC20
NC25
NC30
NC35
NC40
0352213B90
0352213B120

18
M5RT150BR NC CURVES
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20μPa)
NC70
NC45
NC50
NC55
NC60
NC65
NC20
NC25
NC30
NC35
NC40
0352213B150
M5RT180BR NC CURVES
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20μPa)
NC70
NC45
NC50
NC55
NC60
NC65
NC20
NC25
NC30
NC35
NC40
0352213B180