Flexible. The. Chillers

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Kathryn Singleton
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1 MFCA FreeControl Variable Frequency Modular Heat Pump Energy Saving & High Efficiency Flexible & Reliable Environment Friendly The Creatorr and Leader of Modular Chillers

2 Contents What is MFCA Features Control System Model Designation Technical Data Dimensions and Installation Piping Connection Electrical Connections CC

What is MFCA No need for computer room and special operator, the air conditioning system is always energy saving even in

change your mind MFCA Modular Air Cooled (Heat Pump) Chiller control etc.

It is more energy efficient, flexiblee and reliable than a VRF air conditioning system.

restaurants, schools, and hospitals to the name a few.

controls and variable frequency MFCA chiller combined with a separate network communication control system, provide data

At the start of any AHUC it gives run signal to the MFCA, while the MFCA main controller MASC will regulate cooling

Therefore, the MFCA is an intelligent central air conditioner provides total control without a need for computer The MFCA

3 What is MFCA No need for computer room and special operator, the air conditioning system is always energy saving even in night or overtime in holiday If you are planning to choose VRF air conditioning system for the above reason, now, you can change your mind MFCA Modular Air Cooled (Heat Pump) Chiller control etc., which takes energysaving, flexibility and reliability of modular chillers to a new level. room and special operator. It is more energy efficient, flexiblee and reliable than a VRF air conditioning system. MFCA modular air cooled (heat pump) chiller is a central air conditioning system suitable for office buildings, hotels, restaurants, schools, and hospitals to the name a few. It is based on the patented Multistack modular technology, combined with new technology such as communication & separate controls and variable frequency MFCA chiller combined with a separate network communication control system, provide data communication between Air Handling Unit Controller (AHUC) provided by Multistack and MFCA. At the start of any AHUC it gives run signal to the MFCA, while the MFCA main controller MASC will regulate cooling output automatically according to the AHU cooling demand. Therefore, the MFCA is an intelligent central air conditioner provides total control without a need for computer The MFCA consists of modular combinations, wheree customers can select appropriate numbers of modules to match cooling capacity. Each has separate water pump, in addition, each chiller has one master module that is equipped with variable speed compressorr frequency range from 30 to 90 Hz. The master module unload to as low as 3.5 ton and achievee efficiency level of EER 18 (COP 5.26) 1

Why MFCA MFCA Features Modular, Variable Frequency, VWF Energy Saving 2 For a Variable Refrigerant Flow (VRF) air conditioning system, the compressor feeds refrigerant to the indoor unit for direct

When the pipe length between the indoor and outdoor unit is too long, the refrigerant pressure loss caused by the piping, especially the pressure drop in the suction line will force the running

4 Why MFCA MFCA Features Modular, Variable Frequency, VWF Energy Saving 2 For a Variable Refrigerant Flow (VRF) air conditioning system, the compressor feeds refrigerant to the indoor unit for direct evaporating (cooling) or condensing (heating), to cool or heat the indoor air. When the pipe length between the indoor and outdoor unit is too long, the refrigerant pressure loss caused by the piping, especially the pressure drop in the suction line will force the running compressor to a higher compression ratio, thus greatly decreasing the cooling efficiency. The longer the length of the pipe, the higher the efficiency loss will be. Furthermoree to ensure compressorr oil recovery at low loads, it has to operate more often in high loads. Overlong piping may even cause abnormal system operation. Using water as the medium of transferring, MFCA further provides energy savings by keeping refrigerant charge and refrigerant flow pressure drop to minimum when compared to VRF. For chiller consisting of multiple MFCA modules, using variable frequency combined with constant frequency will meet the requirement for energy saving and economy. One module has a variable frequency system, with System running efficiency change along with equivalent length of piping working frequency in range of 30 90Hz. Minimumm cooling capacity output is only 3.5ton and maximum cooling efficiency up to EER 18(COP5.26)(Part Load Condition ). While other modules running at nominal frequency, on or off according to cooling demand. This way satisfies the change of system load demand and will save 15% power than normal chillers. A high reliable vertical pump is installed inside each module of MFCA the chiller, it runs with modules synchronously according to system load demand. In this way, it will not (100ton VRV AC VS Central AC) only reduce compressor running at low load, but also lower the power consumptionn of water pump to a minimum.

Simple Installation, High Reliability Since VRF air conditioning system uses

leakeage and its imperceptibility due to pipe connection deficiency and

unnecessary expensive maintenance cost in the long term.

and outdoor units, installation of water system is much simpler than that of

minimum cost which does not affect the outdoor unit.

chiller and the indoor fan coil, the user runs the fan coil through indoor

Similarly, running, FreeControl system will automatically outdoor chiller.

start when no fan coils are shut down the FreeControl system will

to form a system, when necessary, and pipe size has a certain abundance, just

Similarly, you can also purchase and install the chiller by stages to improve

5 Simple Installation, High Reliability Since VRF air conditioning system uses copper refrigerant pipe to connect outdoor and indoor units, refrigerant leakeage and its imperceptibility due to pipe connection deficiency and complexity greatly affect the chiller working efficiency, and bring unnecessary expensive maintenance cost in the long term. In the case of the MFCA system, it is a simple water pipe that connects indoor and outdoor units, installation of water system is much simpler than that of refrigerant pipe system, and water leak is easy to detect, and repair with minimum cost which does not affect the outdoor unit. Convenient & Flexible MFCA FreeControl system uses network connect outdoor chiller and the indoor fan coil, the user runs the fan coil through indoor AHUC (fan coil the outdoor chiller. Similarly, running, FreeControl system will automatically outdoor chiller. When the outdoor chiller is in operation, communication to controller) will start when no fan coils are shut down the FreeControl system will automatically regulate the unit running numbers and output load based on demanded cooling capacity output. to avoid overload Addon Flexibility The chiller consist of 16 modules max. to form a system, when necessary, and pipe size has a certain abundance, just add on new modules to increase unit capacity without any change to the system. Similarly, you can also purchase and install the chiller by stages to improve the capital usage. 3 MFCA chiller consists of multiple modules. Each module is an independent refrigeration system and back Modular up for each other. systems offer redundancy where, in case of one module failure, other modules continue to operate and provide cooling or heating.

4 Low Noise MFCA usess low speed axial fans which greatly lowers the chiller operation noise.

pressure, this enables the fan to operate quieter under low temperature and greatly reduce the fan

Since the unit running at part load in most of time, the variable frequency drive compressor also

Environment Friendly MFCA MFCA uses high efficiency environment friendly refrigerant R410A

Compact brazed plate heat exchanger also reduce refrigerant charge by 40% than traditional chillers.

brazed Plate Heat Exchanger (PHE) for heat recover as well as a hot water accumulator and circular

cooling mode operation to obtain free hygiene hot water.

6 4 Low Noise MFCA usess low speed axial fans which greatly lowers the chiller operation noise. Optional variable speed fan control the fan speed according to the ambient temperature and running pressure, this enables the fan to operate quieter under low temperature and greatly reduce the fan power consumption over the whole year. Since the unit running at part load in most of time, the variable frequency drive compressor also work quiet in most of the running hours. Environment Friendly MFCA MFCA uses high efficiency environment friendly refrigerant R410A recommended by EU. Compact brazed plate heat exchanger also reduce refrigerant charge by 40% than traditional chillers. It helps the manufacturer and end users minimize their liability reduces carbon emission and protect our environment. Optional Features Energysaving recovery system heat Each module is fitted with a stainless steel brazed Plate Heat Exchanger (PHE) for heat recover as well as a hot water accumulator and circular pump. Heat recovery system is used for recovering discharge gas heat of the compressor at the cooling mode operation to obtain free hygiene hot water. Hydraulic balancing module Hydraulic balancing module is integral part of the module. It consists of hermetic fixed pressure expansion tank, auto water supply valve and pressure differential bypass valve. This protects the system water from external contaminationn and helps avoid pump overload as opposed to the open tank. Remote monitoring system The MFCA heat pump/chiller can be monitored by a PC or lap top via RS485 serial port for safe and reliable operation.

MFCA Control System MFCA control system consists of main controller MASC/MV6, fan coil controller AHUC, and repeater hub CONNECTOR.

Among the treetype network, CONNECTOR can be looked as central node of a subarea, each CONNECTOR has four ports, two of them are for connecting with the AHUC, a maximum of 32 AHUC can be connected at

The other two ports of the CONNECTOR are for connection with the Fresh Air Handling Unit (FAHU), once the AHUC is in operation in the subarea where the CONNECTOR locates, it will start FAHU unit at

7 MFCA Control System MFCA control system consists of main controller MASC/MV6, fan coil controller AHUC, and repeater hub CONNECTOR. The system is structured of network communication and uses RS485 serial port. Among the treetype network, CONNECTOR can be looked as central node of a subarea, each CONNECTOR has four ports, two of them are for connecting with the AHUC, a maximum of 32 AHUC can be connected at any one time for each port, and total 64 AHUC for two ports. The other two ports of the CONNECTOR are for connection with the Fresh Air Handling Unit (FAHU), once the AHUC is in operation in the subarea where the CONNECTOR locates, it will start FAHU unit at the same time. Similarly, when all AHUC in subarea closed, it will also shut down FAHU unit. Up to 16 sub ports are used for connecting with PC. CONNECTORs can be plugged to connector to form a larger network group, wee the figure below. When any of the AHUC in the system is started, it will give a call to outdoor unit through this network to start the MFCA unit. When all the whole AHUC in the network are OFF, MASC shuts down the MFCA unit; the MFCA unit will stay in stand by and awaiting for the next call. higher levell 5

MASC Main Controllerr 6 MASC main controller is based on Multistack s advanced MV6 control technology, providing powerful control and protections for the MFCA modular heat pump/ chiller.

running load limit Load/unload delay time Auto on/off timing MASC main controller monitors the chiller fault conditions below, and shuts down the compressor or chiller when fault occurs, a fault

8 MASC Main Controllerr 6 MASC main controller is based on Multistack s advanced MV6 control technology, providing powerful control and protections for the MFCA modular heat pump/ chiller. It controls the below parameters: Chilled(hot)water leaving temperature Max. running load limit Load/unload delay time Auto on/off timing MASC main controller monitors the chiller fault conditions below, and shuts down the compressor or chiller when fault occurs, a fault alarm will be activated at the same time: High discharge pressure Low suction pressure Compressor overload Low evaporating temp. Low CH.W.L.T Loss of chilled water The setting or modification of alll control and protections should be passed with computer password to prevent importantt parameters being modified by unauthorized personnel. MASC main controllerr will accumulate automatically the running hours of each compressor and hencee establishes working sequencess to ensure each compressor has even running hours. AHUC Fan Coil Temperature Controller MULTISTACK provides two types of special AHUC fan coil temperaturee controller indoor fan coil control, water supply regulation valve. It also communicates with the outdoor MFCA unit to meet the demand. The basic functions and technical data of AHUC are as below: Function Technical data Temp. range Temp. control precision Input power Power consumption Serial port Output signal AHUCD AHUCP Set and display indoor temperature Cooling/heating/ /ventilation mode Fan rotary speed manual/auto Fan coil motorized valve control 535 C ±0.5 C AC220V/50Hz/1Ph 1W RS485 On/off signal 420mA analog signal Used for onoff Used for proportional motorized valve motorized valve

9 Model Designation MFCA 40 H G A V 1 F F=Front Discharge unit (all modules with water header) R=Rear Discharge unit (all modules with water header) T=Top Discharge unit Configuration : FRONT to BACK Module (water header for front module only) IN LINE Module (all modules with water header) 1= Module w/ chilled water header 2= Module w/o chilled water header Note: No. of modules = 1 to 10 V= Variable frequency compressor module C= Constant frequency compressor module A= AC380V/50Hz/3Ph B= AC415V/60Hz/3Ph R 410A H= Heat pump C= Cooling only Modular Free Control Air Cooled Chiller For example: Order for Front or Rear Discharge Unit Two modules Air Cooled unit = MFCA40CGAV1F(or R) + MFCA40CGAC1F(or R) three modules Air Cooled unit = MFCA40CGAV1F(or R) + MFCA40CGA C1F(or R) x 2, etc. 7 Order for Top Discharge Unit Two modules Air Cooled unit FRONT TO BACK = IN LINE = MFCA40CGAV1T + MFCA40CGAC2T, OR MFCA40CGAV1T + MFCA40CGAC1TT three modules Air Cooled unit FRONT TO BACK = IN LINE = MFCA40CGAV1T + MFCA40CGAC2TT + MFCA40CGAC1T, MFCA40CGAV1T + MFCA40CGAC1TT x 2, etc. OR Model selection Outdoor unit MFCA, fan coil controller AHUCD or AHUCP, and repeater hub (connector) etc. are special equipments of FreeControl system that are supplied by Multistack. When placing order with Multistack International Limited or its authorized agents, the customers are required to specify quantity and type of thesee equipment. For other equipments, the user may obtain from other suppliers.

10 Technical Data AC380V420V / 50Hz / 3Ph Master Slave Model MFCA 40HGAV 40CGAV 40HGAC 40CGAC Cooling Capacity (kw) Compressor power (kw) Max. Min. Max. Min Heating Capacity (kw) Compressor power (kw) Max. Min. Max. Min Type Variable frequency scroll Scroll Compressorr Quantity Running frequency Hz Max. Min Refrigerant R410A Electrical data Startup current A Max. running current A Water heat exchanger R410A Type Flow rate l/s Pressure drop kpa Stainless steel brazed PHE Type Fin tube 8 Air heat exchanger R410A Fan type No of fan Air flow per fan Axial Fan power/each (kw) 0.5 Type Vertical centrifugal Quantity 1 Water pumpp Flow rate l/s 1.91 Hhead/Lhead mh2o 35/28 Power (Hhead/Lhead) kw 3.0/1.5 Dimension (W x D x H) mmm 1800 x 900 x 2050 Pipe connection 4 Weight Shipping/Operation kg 562/ / / / /541 Remark: (1) Cooling: Ambient 35 C; chilled water entering/leaving temperature 12 C /7 C (2) Heating: Ambient 7 C; hot water entering/leaving temperature 40 C/45 C Low head water pump is standard supply

11 Cooling Performance Correction Curve Heating Performance Correction Curve 9 Actual cooling performance calculation Cooling capacity = Nominal cooling capacity Cy Compressor cooling power = Nominal cooling power Pc Total power = Compressor cooling power + Axial fan power Actual heating performance calculation Heating capacity = Nominal heating capacity Hy Compressor heating power = Nominal heating power Ph Total power = Compressor heating power + Axial fan power

12 Dimensions and Installation Top Discharge Installation 10 Note 1. Except module No.1 is variable frequency model MFCA40GAV, other modules are constant frequency model MFCA40GAC. square steel and vibration absorber should be prepared by the 2. Structural user.

13 Dimensions and Installation Front / Rear Discharge Installation 11 Note 1. Except module No.1 is variable frequency model MFCA40GAV, other modules are MFCA40GAC. 2. Structural square steel and vibration absorber should be prepared by the user. constant frequency model

Piping Connection Installation specifications: a) Code: 1.

Hermetic fixed pressuree expansion tank and motorized water

Pressure differential bypass valve b) The above parts will

the user; c) d) Its unnecessary to install water flow switch

module to detect water flow; Valve 1A and 1B should be closed

any mechanical debris, and the same requirement for piping

14 Piping Connection Installation specifications: a) Code: 1. (AG) Isolation valve 2. Filter 3. Hermetic fixed pressuree expansion tank and motorized water supply valve 4. Pressure differential bypass valve b) The above parts will not be provided with the chiller and should be prepared by the user; c) d) Its unnecessary to install water flow switch for the water system since there is a device within each module to detect water flow; Valve 1A and 1B should be closed before the water system is cleaned thoroughly to get rid of any mechanical debris, and the same requirement for piping leak test. Otherwise it may cause the chiller being blocked if filling water to the piping system or starting circulation before it is cleaned thoroughly. 12

Electrical Connections Compressor Fan (each) Model MCC(A) MRC(A) STR(A)

conditionn is beyond rating operation condition range, the compressor s

The cable selection for main power supply should conform to MRC, power

15 Electrical Connections Compressor Fan (each) Model MCC(A) MRC(A) STR(A) Cooling RLA(A) Heating Rated load amperes(a) Startup current(a) ) MFCA040GAV (@ 90Hz) 20(@ 90Hz) MFCA040GAC Remark: MCC MRC STR RLA Maximum continuous running current. The motor s inner protection device will activate when compressor s running current exceeds it. Maximum running current. At the beginning stage of the operation, or the operation conditionn is beyond rating operation condition range, the compressor s maximum running current ever recorded. Compressor startup current. Rated load amperes. The compressor s running current under rated operation condition. 1. The cable selection for main power supply should conform to MRC, power supply voltage, allowance of voltage imbalance, ambient temperature and local electrical code. 2. Each power supply circuit should use separate protection device and warning label is required to indicate cutoff procedure. 3. Ground connection terminal installed inside the electrical box of each module must be grounded.

140 BERNARD STREET, CHELTENHAM, VIC 3192, AUSTRALIA TELEPHONE: 613 8586 8200 FACSIMILE: 613 8586 8202 Email:

16 140 BERNARD STREET, CHELTENHAM, VIC 3192, AUSTRALIA TELEPHONE: FACSIMILE: Since MULTISTACK INTERNATIONAL LIMITED has a policy of continuous product improvement, it reserves the right to change design and specification without notice. Multistack supplied by DunnAir international Limited (a wholly owned subsidiary of Multistack International Limited).

Air Cooled Scroll Chiller / Heat Pump

Air Cooled Scroll Chiller / Heat Pump SRA 145 Nominal Capacity 67.5 to 1080 kw Refrigerant: R407C and R134a Contents Features 1 MV7 Control 3 Physical Data R407c 5 Physical Data R134a 6 Unit Performance