Air to Air Heat Exchanger

Transcription

1 Air to Air Heat Exchanger VN-M1HE / VN-M2HE VN-M3HE / VN-MHE VN-M6HE / VN-M8HE VN-M1HE VN-M1HE VN-M2HE Air to Air Heat Exchanger MMD VN2HEXE MMD VN82HEXE MMD VN12HEXE with DX-coil Type CONTENTS 1. Specifications 2. Dimensions 3. Wiring diagram 4. Center of gravity 5. Electrical characteristics 6. Fan characteristics 7. Sound characteristics (NC curve)

2 1. Specifications Item Model VN-M1HE VN-M2HE VN-M3HE VN-MHE VN-M6HE VN-M8HE VN-M1HE VN-M1HE VN-M2HE Power supply (V) AirFlow (L/S) External static pressure (Pa) Power consumption (W) Sound pressure level (db(a)) Temperature Exchange Efficiency (%) Enthalpy Exchange Efficiency (%) Heating Cooling Dimension (Length x Width x Height) (mm) Weight (kg) Single phase 22-24V~Hz (Extra high) (Extra high) (Extra high) (Extra high) (Extra high) (Extra high) (Extra high) x 9 x x 114 x x 1189 x x 1189 x Duct Spigot Ø (mm) Ø1 Ø1 Ø1 Ø2 Indoor side: 4 off Ø2 spigots Outdoor side: 2 off 283x73 Filtration efficiency grade (%) Around unit Operating range Outdoor Air (OA) Return Air (RA) 82-1 C~4 C 8%RH or less -15 ~43 C 8%RH or less 5 C~4 C 8%RH or less 1. Air flow can be change between high (extra high) mode and low mode for both heat exchange mode and bypass mode 2. fan mode is set from factory, extra high fan mode can be set by hard wiring on fan coil PC board 3. Sound pressure level are measured 1.5m below the center of the unit, and within an anechoic chamber in accordance with JIS B

3 2. Dimensions VN-M1HE Installation example Attention 1. Duct size (Nominal Diameter): ø1 2. The above dimensions do not include the thickness (5 mm) of the insulation material on the unit body. Attention 1. The two outdoor ducts (the Outdoor air Duct and the Exhaust air Duct) must be insulated to prevent condensation (Material: Glass wool, Thickness: 25 mm) 2. It is recommended that you use an electric damper together with the Air to Air Heat Exchanger, as wind may enter the room while the unit is not in operation in the cold or windy region. 3. As shown in the psychrometric chart, Point A is suction air condition in high temperature, Point B is discharge air condition in low temperature and Point C is the air condition that exchanged heat. If C is located at the left of the saturation curve as shown, it is dewed or frosted in the heat exchanger element of the unit. In this case to prevent the dew or frost, be sure to heat B up to B' for making C C'(right side of saturation curve). 3

4 VN-M2HE, VN-M3HE Installation example Attention 1. Duct size (Nominal Diameter): ø1 2. The above dimensions do not include the thickness (5 mm) of the insulation material on the unit body. Attention 1. The two outdoor ducts (the Outdoor air Duct and the Exhaust air Duct) must be insulated to prevent condensation (Material: Glass wool, Thickness: 25 mm) 2. It is recommended that you use an electric damper together with the Air to Air Heat Exchanger, as wind may enter the room while the unit is not in operation in the cold or windy region. 3. As shown in the psychrometric chart, Point A is suction air condition in high temperature, Point B is discharge air condition in low temperature and Point C is the air condition that exchanged heat. If C is located at the left of the saturation curve as shown, it is dewed or frosted in the heat exchanger element of the unit. In this case to prevent the dew or frost, be sure to heat B up to B' for making C C'(right side of saturation curve). 4

5 VN-MHE, VN-M6HE Installation example Attention 1. Duct size (Nominal Diameter): ø2 2. The above dimensions do not include the thickness (5 mm) of the insulation material on the unit body. Attention 1. The two outdoor ducts (the Outdoor air Duct and the Exhaust air Duct) must be insulated to prevent condensation (Material: Glass wool, Thickness: 25 mm) 2. It is recommended that you use an electric damper together with the Air to Air Heat Exchanger, as wind may enter the room while the unit is not in operation in the cold or windy region. 3. As shown in the psychrometric chart, Point A is suction air condition in high temperature, Point B is discharge air condition in low temperature and Point C is the air condition that exchanged heat. If C is located at the left of the saturation curve as shown, it is dewed or frosted in the heat exchanger element of the unit. In this case to prevent the dew or frost, be sure to heat B up to B' for making C C'(right side of saturation curve). 5

6 VN-M8HE, VN-M1HE Installation example Attention 1. Duct size (Nominal Diameter): ø2 2. The above dimensions do not include the thickness (5 mm) of the insulation material on the unit body. Attention 1. The two outdoor ducts (the Outdoor air Duct and the Exhaust air Duct) must be insulated to prevent condensation (Material: Glass wool, Thickness: 25 mm) 2. It is recommended that you use an electric damper together with the Air to Air Heat Exchanger, as wind may enter the room while the unit is not in operation in the cold or windy region. 3. As shown in the psychrometric chart, Point A is suction air condition in high temperature, Point B is discharge air condition in low temperature and Point C is the air condition that exchanged heat. If C is located at the left of the saturation curve as shown, it is dewed or frosted in the heat exchanger element of the unit. In this case to prevent the dew or frost, be sure to heat B up to B' for making C C'(right side of saturation curve). 6

7 VN-M1HE, VN-M2HE ~ Installation example Attention 1. Duct size (Nominal Diameter) Indoor side: ø2 Outdoor side: 283x73 2. The above dimensions do not include the thickness (5 mm) of the insulation material on the unit body. Attention 1. The two outdoor ducts (the Outdoor air Duct and the Exhaust air Duct) must be insulated to prevent condensation (Material: Glass wool, Thickness: 25 mm) 2. It is recommended that you use an electric damper together with the Air to Air Heat Exchanger, as wind may enter the room while the unit is not in operation in the cold or windy region. 3. As shown in the psychrometric chart, Point A is suction air condition in high temperature, Point B is discharge air condition in low temperature and Point C is the air condition that exchanged heat. If C is located at the left of the saturation curve as shown, it is dewed or frosted in the heat exchanger element of the unit. In this case to prevent the dew or frost, be sure to heat B up to B' for making C C'(right side of saturation curve). 7

8 3. Wiring diagram VN-M1HE, VN-M2HE, VN-M3HE, VN-MHE, VN-M6HE, VN-M8HE, VN-M1HE Code CN*** F1 FM1 FM2 DAM TRA Part name Connector Fuse Air supplying motor Air exhausting motor Damper motor TRA sensor Code TOA RY71, RY72 RY74, RT75 TB1 TB2 TB3 Part name TOA sensor Relay for air supplying motor Relay for air exhausting motor Terminal block (power supply) Terminal block (communication) Terminal block (external output) Code Part name SW31, SW71 SW72, SW73 DIP switch 43F11, 43F12 Relay for air supplying motor 43F21, 43F22 Relay for air exhausting motor 1. The dotted line represents a wire procured locally, and the dashed line represents an option sold separately. 2. represents a terminal block, represents a connection terminal, and represents a connector on the printed circuit board. 3. represents a protective earth. 4. represents a printed circuit board. 5. Using a no voltage a-contact input of the external input (Sold separately), the following operations are available: Between 1 and 2: Selecting the remote controller operation (Invalid/Valid) Between 1 and 3: Adjusting the ventilation fan speed (/) Between 1 and 4: Selecting the ventilation mode (Bypass mode/heat exchange mode) Between 1 and 5: Operation (ON/OFF) Use a microcurrent contact (DC12V, 1mA). In addition, ON/OFF operation is possible when using a voltage of DC12V or 24V. 6. Blue wire () is connected as factory default. To switch to Extra, connect black wire s connector instead of blue. 7. When the temperature of the outdoor air is below -1 C, the unit runs in the cold mode (the ventilator for air supply runs intermittently). The unit cannot run when the temperature of the outdoor air is below -15 C. The ventilator for air supply stops running and the ventilator for air exhaust also stops depending on the settings. 8. Even if Bypass mode is selected manually, the unit switches to Heat exchange mode automatically to prevent condensation when the temperature of the outdoor air is below 15 C. However, Bypass mode is still displayed. 8

9 VN-M1HE, VN-M2HE Code CN*** F1 FM1,FM3 FM2,FM4 DAM1,DAM2 TRA Part name Connector Fuse Air supplying motor Air exhausting motor Damper motor TRA sensor Code TOA RY71, RY72 RY74, RT75 TB1 TB2 TB3 Part name TOA sensor Relay for air supplying motor Relay for air exhausting motor Terminal block (power supply) Terminal block (communication) Terminal block (external output) Code TB4 SW31, SW71 SW72, SW73 Part name Terminal block DIP switch 43F11, 43F12 Relay for air supplying motor 43F21, 43F22 Relay for air exhausting motor 1. The dotted line represents a wire procured locally, and the dashed line represents an option sold separately. 2. represents a terminal block, represents a connection terminal, and represents a connector on the printed circuit board. 3. represents a protective earth. 4. represents a printed circuit board. 5. Using a no voltage a-contact input of the external input (Sold separately), the following operations are available: Between 1 and 2: Selecting the remote controller operation (Invalid/Valid) Between 1 and 3: Adjusting the ventilation fan speed (/) Between 1 and 4: Selecting the ventilation mode (Bypass mode/heat exchange mode) Between 1 and 5: Operation (ON/OFF) Use a microcurrent contact (DC12V, 1mA). In addition, ON/OFF operation is possible when using a voltage of DC12V or 24V. 6. Blue wire () is connected as factory default. To switch to Extra, connect black wire s connector instead of blue. 7. When the temperature of the outdoor air is below -1 C, the unit runs in the cold mode (the ventilator for air supply runs intermittently). The unit cannot run when the temperature of the outdoor air is below -15 C. The ventilator for air supply stops running and the ventilator for air exhaust also stops depending on the settings. 8. Even if Bypass mode is selected manually, the unit switches to Heat exchange mode automatically to prevent condensation when the temperature of the outdoor air is below 15 C. However, Bypass mode is still displayed. 9

10 4. Center of gravity VN-M1 to 1HE Unit: mm B C EA (Exhaust air) RA (Return air) A Outdoor side Indoor side OA (Outdoor air) Centre of gravity SA (Supply air) 6 or more 1 to 2 2 For the inspection of Filters, Heat Exchange Elements, Fans, Motors and Damper. Inspection Opening 4 4 or more VN-M1 and 2HE B C A Model Name A (mm) B (mm) C (mm) Weight (kg) Heat exchange element VN-M1HE, M2HE VN-M3HE VN-MHE, M6HE VN-M8HE, M1HE VN-M1HE, M2HE

11 5. Electrical characteristics Hz Model VN-M1HE VN-M2HE VN-M3HE VN-MHE VN-M6HE VN-M8HE VN-M1HE VN-M1HE VN-M2HE Nominal Voltage (V-Ph-Hz) Voltage Range Fan Motor Power Supply Min Max kw FLA MCA MOCP x x x x x x x x x x x x x x x x x x x x x x x x x x x Fan Motor : 2(4)pcs/unit MCA :Minimum Circuit Amps FLA :Full Load Amps MOCP :Maximum Overcurrent Protection (Amps) kw :Fan Motor Reated Output 11

12 6. Fan characteristics (24V~, Hz) P-Q Curve * When friction coefficient of pipe (duct) : VN-M1HE VN-M2HE External static pressure (Pa) Temperature Enthalpy (in heating) Enthalpy (in cooling) Extra m 3 Air Volume (m /h) Equivalent pipe length 2 m 1 m Duct resistance curve Exchange Efficiency (%) External static pressure (Pa) Temperature Enthalpy (in heating) Extra Enthalpy (in cooling) 1 m Equivalent pipe length m 6 m 4 m 2 m Duct resistance curve Exchange Efficiency (%) 3 Air Volume (m /h) External static pressure (Pa) VN-M3HE Temperature Enthalpy (in heating) Enthalpy (in cooling) Extra 1 m m 6 m 4 m Equivalent pipe length 3 Air Volume (m /h) 2 m Duct resistance curve Exchange Efficiency (%) External static pressure (Pa) VN-MHE Temperature Enthalpy (in heating) Enthalpy (in cooling) Extra Air Volume (m /h) 1 m 8 m 6 m 4 m 2 m Duct resistance curve Exchange Efficiency (%) VN-M6HE VN-M8HE External static pressure (Pa) Enthalpy (in heating) Temperature Enthalpy (in cooling) Extra Air Volume (m /h) Equivalent pipe length 1 m 8 m 6 m 4 m 2 m Duct resistance curve Exchange Efficiency (%) External static pressure (Pa) Temperature Enthalpy (in heating) Enthalpy (in cooling) Extra Equivalent pipe length 1 m m 6 m 4 m 2 m Duct resistance curve Exchange Efficiency (%) 3 Air Volume (m /h) 12

13 (24V~, Hz) P-Q Curve * When friction coefficient of pipe (duct) : VN-M1HE VN-M1HE 4 4 Temperature Enthalpy (in heating) Exchange Efficiency (%) 4 4 Temperature Enthalpy(in heating) Exchange Efficiency (%) External static pressure (Pa) Extra Enthalpy (in cooling) Equivalent pipe length 1 m 8 m 6 m 4 m 2 m 6 Duct resistance curve External static pressure (Pa) Extra high Enthalpy(in cooling) Air Volume (m /h) 3 Air Volume (m /h) VN-M2HE 4 4 Temperature Enthalpy(in heating) Exchange Efficiency (%) External static pressure (Pa) Enthalpy(in cooling) Extra high Air Volume (m /h) 13

14 7. Sound characteristics (NC curve) (24V~, Hz) VN-M1HE 9 Extra 8 Under from body 1.5m 1.5m Measuring point Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC-3 2 NC VN-M2HE VN-M3HE 9 8 Extra 9 8 Extra Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC-3 Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC NC-2 NC VN-MHE VN-M6HE 9 8 Extra 9 8 Extra Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC-3 Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC-3 2 NC-2 2 NC

15 (24V~, Hz) VN-M8HE 9 8 Extra Under from body 1.5m 1.5m Measuring point Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC-3 2 NC VN-M1HE VN-M1HE 9 Extra 9 Extra 8 8 Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC-3 Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC NC-2 NC VN-M2HE 9 8 Extra Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC NC

16 (24V~, Hz) VN-M1HE 9 Extra 8 1.5m SA 45 Measuring point Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC-3 2 NC VN-M2HE VN-M3HE 9 Extra 9 Extra 8 8 Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC-3 Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC NC-2 NC VN-MHE VN-M6HE 9 Extra 9 Extra 8 8 Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC-3 Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC-3 2 NC-2 2 NC

17 (24V~, Hz) VN-M8HE 9 Extra 8 1.5m SA 45 Measuring point Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC-3 2 NC Octabe band center frequency(hz) VN-M1HE VN-M1HE 9 Extra 9 Extra 8 8 Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC-3 Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC NC-2 NC VN-M2HE 9 8 Extra Octave band sound pressure level(db) NC-7 NC-6 NC- NC-4 NC NC

18 Air to Air Heat exchanger with DX-coil Type MMD VN2HEXE MMD VN82HEXE MMD VN12HEXE 18

19 Air to Air Heat exchanger with DX-coil Type Contents Technical Data 1. MMD-VNxx2HEXE (Hz) 1-1. Specifications Exchange Efficiency Correction Sensible Capacity Table Dimension Wiring Diagram Fan Characteristics Sound Characteristics (NC Curve)

20 1. Specifications Item OA conditioning load Capacity code Power supply (V) Fan unit Temperature Exchange Efficiency (%) Enthalpy Exchange Efficiency (%) Weight (kg) Model MMD-VN2HEXE MMD-VN82HEXE MMD-VN12HEXE Cooling kw 4.1 (1.3 *) 6.56 (2.6 *) 8.25 (2.32 *) Heating kw 5.53 (2.33 *) 8.61 (3.61 *) 1.92 (4.32 *) (Extra high) (Extra high) er Limit Upper Limit (Extra high) (Extra high) (Extra high) (Extra high) Extra A A A (Extra high) x 114 x Duct Spigot Ø (mm) 2 2 Heat exchanger Heat-insulating material Heating Cooling Power Input (Heat exchange mode) Running Current (Amps) Sound pressure level (db(a)) Standard Airflow (L/s) External static pressure (Pa) Airflow Limit (L/s) Dimension (Length x Width x Height) (mm) Single phase 22-24V~Hz Finned tube Flexible urethane foam 1739 x 1189 x 43 Air filter Standard filter (Gravitational method 82%) & efficiency filter (Colorimetric method 65%) Controller Remote controller (Sold Separately) Connection Pipe Size Gas mm Ø9.5 Ø12.7 Ø12.7 Liquid mm Ø6.4 Ø6.4 Ø6.4 Drain port (Nominal dia. mm) Ø25 (Polyvinyl chloride tube) 1. Cooling and heating capacities are based on the following conditions: Cooling capacities are based on: indoor temperature: 27 CDB/19 CWB, Outdoor temperature: 35 CDB Heating capacities are based on: indoor temperature: 2 CDB, Outdoor temperature: 7 CDB/6 CWB 2. fan mode is set from factory, extra high fan mode can be set by hard wiring on fan coil PC board 3. * Indicates the heat reclaimed from the heat recovery ventilator 4. Sound pressure level is measured 1.5m below the center of the unit, and within an acoustic chamber 2

21 1.1 Connectability of Air to Air Heat Exchanger with DX Coil ## NOTE: NOT CONNECTABLE TO SHRM (HEAT RECOVERY SYSTEMS) OR MINI SMMS SYSTEMS ## 21

22 Air to Air Heat exchanger with DX-coil Type 1-2. Exchange Efficiency Correction Exchange efficiency correction when supply air volume and exhaust air volume are different Exchange efficiency correction curve Exhaust to supply ratio Exhaust air volume / Supply air volume Exchange efficiency based on supply air volume [%] Corrected exchange effciency [%] efficiency based on supply air volume correction curve corresponding to use condition Temperature exchangeefficiency Enthalpyexchange efficiency (heating) Enthalpyexchange efficiency(cooling) Exchange efficiency Air flow supply air volume corrected efficiency 22

23 Air to Air Heat exchanger with DX-coil Type 1-3. Sensible Capacity Table Cooling capacity tables MMD-VN ***HEXE Class DX-coil capacity [kw] Outdoor temp. [ CDB] TC: Total Capacity [kw] SHC: Sensible Heat Capacity [kw] DX-coil inlet temp. [ CWB] TC SHC TC SHC TC SHC TC SHC TC SHC TC SHC

24 Air to Air Heat exchanger with DX-coil Type Heating capacity tables MMD-VN ***HEXE Class DX-coil capacity [kw] Outdoor temp. [ CWB] DX-coil inlet temp. [ CDB] SHC SHC SHC SHC SHC TC: Total Capacity [kw] SHC: Sensible Heat Capacity [kw] 24

25 Air to Air Heat exchanger with DX-coil Type 1-4. Dimension MMD-VN2HEXE Attention 1. Duct size (Nominal diameter): ø2 2. The above dimensions do not include the thickness of the insulation material on the unit body. 25

26 Air to Air Heat exchanger with DX-coil Type MMD-VN82HEXE Attention 1. Duct size (Nominal diameter): ø2 2. The above dimensions do not include the thickness of the insulation material on the unit body. 26

27 Air to Air Heat exchanger with DX-coil Type MMD-VN12HEXE Attention 1. Duct size (Nominal diameter): ø2 2. The above dimensions do not include the thickness of the insulation material on the unit body. 27

28 Air to Air Heat exchanger with DX-coil Type 1-5. Wiring Diagram MMD-VN2HEXE, MMD-VN82HEXE, MMD-VN12HEXE Code CN*** F1 F2 FM1 FM2 DAM TRA TOA TSA TFA TCJ, TC1, TC2 Parts name Connector Fuse (Printed circuit board) Fuse (Motor) Air supplying motor Air exhausting motor Damper motor TRA sensor TOA sensor TSA sensor TFA sensor Indoor coil sensor Code Parts name TB1 Terminal block (Power source) TB2 Terminal block (Communication) TB3 Terminal block (External output) TS1 Float switch PMV Pulse modulating value SW71 Dip switch 43F11, 43F12 Relay for air supplying motor 43F21, 43F22 Relay for air exhausting motor RY71, RY72 Relay for air supplying motor RY74, RY75 Relay for air exhausting motor 1. The dotted line represents a wire procured locally, and the dashed line represents an option sold separately. 2. represents a terminal block, represents a connection terminal, represents a connector on the printed circuit board and represents a short circuit connector. 3. represents a protective earth. 4. represents a printed circuit board. 5. Using a no voltage a-contact input of the external input (option), the following operations are available. Between 1 and 2: Selecting the remote controller operation (Invalid/Valid) Between 1 and 3: Adjusting the fan speed (/) Between 1 and 5: Operation (ON/OFF) Use a microcurrent contact (DC12V, 1mA). In addition, ON/OFF operation is possible when using a voltage of DC12V or 24V. 6. Orange wire () is connected as factory default. To switch to Extra, connect black wire s connector instead of orange. 28

29 Air to Air Heat exchanger with DX-coil Type 1-6. Fan Characteristics MMD-VN2HEXE MMD-VN82HEXE 23V, Hz 3 3 er limit air volume : 33m /h, Upper limit air volume : 6m /h 3 Standard air voleme : m /h Standard air voleme : 8m /h 3 3 er limit air volume : 48m /h, Upper limit air volume : 96m /h 3 External static pressure [Pa] Temperature exchange efficiency Enthalpy exchange efficiency (heating) Enthalpy exchange efficiency (cooling) Extra Exchange efficiency [%] External static pressure [Pa] Temperature exchange efficiency Enthalpy exchange efficiency (heating) Enthalpy exchange efficiency (cooling) Extra Exchange efficiency [%] Air flow [m 3 /h] , Air flow [m 3 /h] MMD-VN12HEXE 3 Standard air voleme : 9m /h 3 3 er limit air volume : 64m /h, Upper limit air volume : 114m /h 4 8 External static pressure [Pa] Enthalpy exchange efficiency (heating) Temperature exchange efficiency Enthalpy exchange efficiency (cooling) Extra Exchange efficiency [%] , 1,2 Air flow [m 3 /h] 29

30 Air to Air Heat exchanger with DX-coil Type 1-7. Sound Characteristics (NC Curve) Model name Power supply (phase/hz/v) Sound pressure level (db) Extra MMD-VN2HEXE Under from body 1.5m MMD-VN82HEXE 1 phase / Hz / 22V-24V m MMD-VN12HEXE Measuring point MMD-VN2HEXE 9 MMD-VN82HEXE 9 8 Extra 8 Extra Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC-3 Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC NC-2 NC Octave band center frequency (Hz) Octave band center frequency (Hz) MMD-VN12HEXE 9 8 Extra Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC-3 NC Octave band center frequency (Hz) 3

31 Air to Air Heat exchanger with DX-coil Type Model name Power supply (phase/hz/v) Sound pressure level (db) Extra MMD-VN2HEXE SA MMD-VN82HEXE 1 phase / Hz / 22V-24V m Measuring point MMD-VN12HEXE MMD-VN2HEXE 9 8 Extra MMD-VN82HEXE 9 8 Extra Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC-3 Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC-3 2 NC-2 2 NC Octave band center frequency (Hz) Octabe band center frequency (Hz) MMD-VN12HEXE 9 8 Extra Octave band sound pressure level (db) NC-7 NC-6 NC- NC-4 NC-3 NC Octave band center frequency (Hz) 31

32 Notice: Toshiba is committed to continuously improving its products to ensure the highest quality and reliability standards, and to meet local regulations and market requirements. All features and specifications are subject to change without prior notice. Air to Air Heat exchanger Type Databook Dec, 211 First Edition