Midea MGRH5A-PA1Z User manual

Midea R410A 50Hz
Aqua Mini
Full DC Inverter Unitary Chiller
Applicable Model:
Midea reserves the right to discontinue, or change specification or designs at any time without notices and
without incurring obligations.
DM16-01.01.24en
MGRH5A-PA1Z
MGRH7A-PA1Z
MGRH10A-PA1Z
MGRH12A-PA3Z
MGRH14A-PA3Z
MGRH16A-PA3Z

Aqua Mini Full DC Inverter Unitary Chiller 50Hz
Content
1. Outdoor units lineup..........................................................2
2.Features..............................................................................4
3.Description of main components....................................8
4.Specifications..................................................................10
5.Dimensions......................................................................14
6.Piping Diagram................................................................15
7.Wiring Diagram ...............................................................16
8.Electric Characteristics..................................................19
9.Capacity Tables.............................................................20
10.Operation Limits ............................................................26
11.Water Pressure Drop....................................................28
12.Sound Level...................................................................31
13.Exploded View..............................................................32
14.Installation ....................................................................38
15.Checking and Starting Up the Unit.............................51
16.Running and Maintenance ..........................................53
17.Controller.......................................................................56
18.Troubleshooting.............................................................69
19.Optional Accessories...................................................94
※Manufacture reserves the right to discontinue, or change at any time, specifications or designs without notices
and without incurring obligations.

Aqua Mini Full DC Inverter Unitary Chiller 50Hz
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1. Outdoor units lineup
MGRH5A-PA1Z, MGRH7A-PA1Z
MGRH10A-PA1Z,MGRH12A-PA3Z
MGRH14A-PA3Z, MGRH16A-PA3Z
Model Power Supply
(V/Ph/Hz) Capacity Compressor
type Heat exchanger A/C mode Hydraulic
module Refrigerant
MGRH5A-PA1Z 220-240/1 /50 5.0kW DC Inverter Plate type Heat pump Built-in R410A
MGRH7A-PA1Z 220-240/1/50 7.0kW DC Inverter Plate type Heat pump Built-in R410A
Model Power Supply
(V/Ph/Hz) Capacity Compressor
type Heat exchanger A/C mode Hydraulic
module Refrigerant
MGRH10A-PA1Z 220-240/1/50 10.0 DC Inverter Plate type Heat pump Built-in R410A
MGRH12A-PA3Z380-415/3/50 11.2 DC Inverter Plate type Heat pump Built-in R410A
MGRH14A-PA3Z380-415/3/50 12.5 DC Inverter Plate type Heat pump Built-in R410A
MGRH16A-PA3Z380-415/3/50 14.5 DC Inverter Plate type Heat pump Built-in R410A

Aqua Mini Full DC Inverter Unitary Chiller 50Hz
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Compressor
(Twin Rotary) structure
2.Features
2.1 High efficient DC inverter compressor
Full DC inverter mini chiller adopts highly intelligent inverter-driven compressor.This advanced technology
enables the output of the outdoor unit to be modulated by the real heat load demands..
This advanced system ensures precise temperature regulation and highly efficient energy usage, making a
significant contribution to limiting the impact on the environment.
2.2 High performance heat exchanger
The new designed window fins enlarge the heat-exchanging area,
which decrease the air resistance, save more power and enhance heat
exchange performance.
Hydrophilic film fins and inner-threaded copper pipes optimize heat
exchange efficiency.
2.3 Low-operating sound design
Optimally design fan shape and new designed discharge air grille and air deflector, making higher air volume
and reduces running noise..
New fan
Air deflector
New grille
Highly Efficient DC Motor:
- Creative motor core design
- High density neodymium magnet
- Concentrated type stator
-Wider operating frequency range
Better balance and Extremely Low Vibration:
- Twin eccentric cams
- 2 balance weights
Highly Stable Moving Parts:
- Optimal material matching rollers and vanes
-Optimize compressor drive technology
- Highly robust bearings
-Compact structure
New design Original design
High efficiency inner-thread pipe,
enhance heat transfer.

Aqua Mini Full DC Inverter Unitary Chiller 50Hz
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2.4 High efficiency
0
0.5
1
1
.5
2
2
.5
3
3.5
5kW 7kW 10kW 12kW 14kW 16kW
3.23 3.11
3.39 3.31 3.21 3.20
EER
0
0.5
1
1.5
2
2.5
3
3.5
5kW 7kW 10kW 12kW 14kW 16kW
3.24 3.2
3.5
3.31 3.25 3.30
COP
2.5 Wideoperationtemperaturerange
Stable and safe running at wide ambient temperature range, cooling performance from -5 ˚C to 46˚C,
heating from -15˚C to 27˚C.
COOLING MODE
HEATING MODE
Outdoor temp.
46°C
27°C
-5°C
-15°C
0 1020304050 -10
-20 °C(D.B.)
2.6 Energy saving and high reliability
By adopting high efficiency plate heat exchanger, the energy consumption can be reduced.

Aqua Mini Full DC Inverter Unitary Chiller 50Hz
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a. Metallic protective cabinet with rustproof polyester paint;
b. Built-in with voltage protection, current protection, anti-freezing protection, water flow protection and
etc., effectively guarantee the system to work safely.
2.7 User friendly remote control
Switch SW4_1(10kW) or SW3_1(12-16kW) on the PCB to ON to enable the following remote control
functions. The setting is not default at factory.
Remote shut down
Remote cooling and heating
Note: When all controller controls together, the unit will work according to the last order.
5/7kW will be available soon.
2.8 Flexible and convenient control
Built-in electronic controller at factory.
Compact devices with advanced function and friendly user interface.
The chiller can be controlled by wired controller (KJR-120F/BMK-E)
also which is optional chosen.
Note: When connecting wired controller, outdoor unit control panel is mainly used for display which can
check parameters and inquiry, and can’t be used to set mode and temperature.
Built-in water pressure gauge. Inspect the water pressure all the time.
2.9 Integrated and compact design
Fully integrated and built-in hydraulic module, such as expansion tank, plate type of heat exchanger,
water circulating pump, etc. It saves installation space and cost.
2.10 EXV control flow more precisely
Patented liquid distribution components to maximize performance and minimize defrost impact.
Stable and accurate gas flow control. EXV achieves 500 pulses to adjust flow precisely. Ensure the
temperature-control precisely and steadily to provide a comfortable environment.

Aqua Mini Full DC Inverter Unitary Chiller 50Hz
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Fast respond resulting in higher efficiency and improved reliability.
10%
15%
20%
25%
30%
35%
40%
45%
50%
55%
60%
65%
70%
75%
80%
85%
90%
95%
100%
2.11 Water pump starts/stops compulsoryfunction
Press “Check” button for 3 seconds to start the water pump operating when the unit is standby. Press
“Check” button for 3 seconds again to stop the water pump.

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3. Description of main components
Structure
Panels and base are made from galvanized steel plate painted with epoxy power to ensure total resistance
to atmospheric pollution, condensate collection pan as standard.
Condenser coils:
The coils are made from high performance and seamless copper tuber and high surface area aluminum fins
to ensure optimum heat exchange capability.Condenser coil protection grill is standard.
Fan motor:
To achieve high efficiency heat exchange, the unit is equipment with the high performance axial-flow fans.
The fan is driven directly by weather proof motor to ensure reliable operation, the fan motor is six-pole
electric motor with built-in thermal cut-out.
Evaporator:
The heat exchanger is made of AISI 316 stainless steel to ensure high heat exchange efficiency, complete
with electric heater and differential pressure switch. The complete heat exchanger is insulated with thermal
insulation closed cell rubber foam to give optimum thermal insulation.
Hydraulic module:
It is fully integrated and equipped with key hydraulic components such as expansion tank, plate type of
heat-exchanger, water circulating pump.
The water pressure difference switch is provided in the units to protect against damage to the water pump.
Power and control electrical panel
Power and control electrical panel constructed in accordance with IEC 204-1/EN60335-2-40, complete with
compressor contactor, control via control panel.
11
12
13
1
2
3
4
5
6
7
8
9
10
5/7KW
1 Electrical panel
2 Display panel
3 Plate heat exchanger
4 4-way valve
5 High pressure switch
6 Low pressure switch
7 Water Pump
8 Accumulator
9 Water flow switch
10 Compressor
11 Condenser
12 Expansion tank
13 Axial-flow fan

Aqua Mini Full DC Inverter Unitary Chiller 50Hz
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1
5
7
8
9
10
11
12
13
14
15
16
17
18
19
2
3
4
6
10~16KW
1 Operation panel
2
Water manometer
3 Automatic discharge valve
4
Axial-flow fan
5 Differential pressure switch
6 Condenser
7 Accumulater
8 Security discharge
9 Electric expansive valve
10 Plate heat exchanger
11 Electrical panel
12 High pressure switc
h
13 4-ways valve
14 Expansion tank
15 Pump
16 Low pressure switch
17 Storage tank
18 Compressor
19 Water supply valve

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4. Specifications
Model MGRH5A-PA1Z MGRH7A-PA1Z
Power supply V-Ph-Hz 220-240, 1, 50 220-240, 1, 50
Cooling*(1) Capacity kW 5.0 7.0
Input kW 1.55 2.25
Cooling*(2) Capacity kW 6.57 7.88
Input kW 1.27 1.84
Heating*(3) Capacity kW 5.5 8.0
Input kW 1.7 2.5
Heating*(4) Capacity kW 6.32 8.29
Input kW 1.52 2.13
EER*(1) kW/kW 3.23 3.11
EER*(2) kW/kW 5.16 4.28
Max. input consumption kW 2.8 3.0
Max. input current A 14.6 15.6
Compressor
Model SNB172FJGMC SNB172FJGMC
Type ROTARY ROTARY
Brand Mitsubishi Electric Mitsubishi Electric
Capacity kW 5.46 5.46
Input kW 1.64 1.64
Rated load current A 8.1 8.1
Locked rotor Amp A 29.5 29.5
Thermal protecto
r
Inner Inner
Refrigerant oil ml FV50S,400 FV50S,400
Outdoor fan
motor
Model WZDK170-38G-1 WZDK170-38G-1
Type DC Motor DC Motor
Brand NIDEC SHIBAURA NIDEC SHIBAURA
Input W 170 170
Speed r/min 820 820
Outdoor coil
Number of rows 22
Tube pitch(a)× row pitch(b) mm 22×19.05 22×19.05
Fin spacing mm 1.6 1.6
Fin type Hydrophilic aluminum foil Hydrophilic aluminum foil
Tube outside dia. and type mm φ7.94 φ7.94
Inner
g
rooved co
pp
er tube Inner
g
rooved co
pp
er tube
Coil length ×height mm 885×880 885×880
Number of circuits 66
Water pump Type RS15/6-3-WILO RS15/6-3-WILO Input (H/M/L) W 93/67/46 93/67/46
Pumping head m 5.5 5.5
Outdoor air flow m
3
/h 5100 5100
Throttle EXV+capillary EXV+capillary
Outdoor noise level (sound pressure)*(3) dB(A) 58 58
Water flo
w
m
3
/h 0.86 1.20
The plate heat-exchanger water pressure
drop kPa 15 15
The Max. and Min. water inlet pressure kPa 500/150 500/150
Outdoor
unit
Net dimension (W×H×D) mm 990×966×354 990×966×354
Packing dimension
(W×H×D) mm 1120×1100×435 1120×1100×435
Net/ Gross weight kg 81
/
91 81/91
Refrigerant Type R410A R410A
Charged volume kg 2.5 2.5
Connection
wiring Power wi
r
e mm
2
3×2.5 3×2.5
Signal wire mm
2
3×0.75 3×0.75
Pipe
diameter Water inlet/outlet inch 1’’ 1’’
Control Wired controlle
r
Wired controlle
r
Ambient temperature ℃Cooling: -5℃~46℃; Heating: -15-27℃(Antifreeze must be added below 5℃)
Water outlet temperature range ℃Cooling: 4~20 ℃; Heating: 30~55 ℃
Note: Specifications are based on the following conditions:
1. Cooling: (*1) chilled water inlet/outlet temperature: 12/7°C,outdoor ambient temperature 35°C DB.
(*2) chilled water inlet/outlet temperature: 23/18°C,outdoor ambient temperature 35°C DB.