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Mitsubishi Electric City Multi PWFY-P36NMU-E-BU Data Book

Air conditioning systems
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AIR CONDITIONING SYSTEMS
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PWFY-P36NMU-E-BU
PWFY-P36NMU-E2-AU
PWFY-P72NMU-E2-AU

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Summary of Contents for Mitsubishi Electric City Multi PWFY-P36NMU-E-BU

  • Page 1 AIR CONDITIONING SYSTEMS MODEL PWFY-P36NMU-E-BU PWFY-P36NMU-E2-AU PWFY-P72NMU-E2-AU...

  • Page 2: Table Of Contents

    CONTENTS AIR TO WATER PWFY-P-NMU-E-BU, PWFY-P-NMU-E2-AU I.AIR TO WATER 1. GENERAL EQUIPMENT DESCRIPTIONS ....................2 1-1. Unit configuration table ........................2 1-2. Operable temperature range ......................2 1-3. Connectable outdoor unit capacity range ..................2 2. SPECIFICATIONS ............................ 3 3. EXTERNAL DIMENSIONS ........................6 4.

  • Page 3: General Equipment Descriptions

    1. GENERAL EQUIPMENT DESCRIPTIONS AIR TO WATER 1-1. Unit configuration table I.AIR TO WATER 1. GENERAL EQUIPMENT DESCRIPTIONS Model PWFY-P36NMU-E-BU PWFY-P36, P72NMU-E2-AU PUHY-P T(S)NU Y-Series PUHY-P Y(S)NU PURY-P T(S)NU Y-Series PUHY-EP T(S)NU R2-Series PURY-P Y(S)NU (High efficiency) PUHY-EP Y(S)NU PUHY-HP TNU H2i-Series (Y) PUHY-HP YNU Outdoor unit...

  • Page 4: Specifications

    800 (785 without legs) × 450 × 300 31-1/2" (30-15/16" without legs) × 17-3/4” × 11-13/16” Net weight lbs(kg) 131 (59) Inverter rotary hermetic compressor Compressor Type Maker MITSUBISHI ELECTRIC CORPORATION Starting method Inverter Motor output Lubricant NEO22 Circulating water Operation volume 0.6~2.15...
  • Page 5 2. SPECIFICATIONS AIR TO WATER Model PWFY-P36NMU-E2-AU 1-phase 208 - 230 V 60Hz Power source 11.7 Heating capacity (Nominal) kcal / h 10,100 39,900 BTU / h 0.025 - 0.028 Power input Current input 0.145 - 0.150 -4~90°F (-20~32°C) R2-Series Temp.
  • Page 6 2. SPECIFICATIONS AIR TO WATER Model PWFY-P72NMU-E2-AU Power source 1-phase 208 - 230 V 60Hz 23.4 Heating capacity (Nominal) kcal / h 20,100 BTU / h 79,800 Power input 0.025 - 0.028 Current input 0.145 - 0.150 -4~90°F (-20~32°C) R2-Series Temp.

  • Page 7: External Dimensions

    3. EXTERNAL DIMENSIONS AIR TO WATER 3. EXTERNAL DIMENSIONS PWFY-P36NMU-E-BU Unit: mm (in) MEES20K028...
  • Page 8 3. EXTERNAL DIMENSIONS AIR TO WATER PWFY-P36, P72NMU-E2-AU Unit: mm (in) MEES20K028...

  • Page 9: Center Of Gravity

    4. CENTER OF GRAVITY AIR TO WATER 4. CENTER OF GRAVITY PWFY-P36NMU-E-BU unit: mm (in) 450 (17-23/32) 300 (11-13/16) 13 (17/32) 500 (19-11/16) 205 (8-3/32) (1-7/8) 525 (20-11/16) unit: mm (in) Model PWFY-P36NMU-E-BU 272 (10-23/32) 355 (13) 119 (4-11/16) PWFY-P36, P72NMU-E2-AU unit: mm (in) 300 (11-13/16) 450 (17-23/32)

  • Page 10: Electrical Wiring Diagrams

    5. ELECTRICAL WIRING DIAGRAMS AIR TO WATER 5. ELECTRICAL WIRING DIAGRAMS PWFY-P36NMU-E-BU MEES20K028...
  • Page 11 5. ELECTRICAL WIRING DIAGRAMS AIR TO WATER PWFY-P36, P72NMU-E2-AU MEES20K028...

  • Page 12: Sound Levels

    6. SOUND LEVELS AIR TO WATER 6. SOUND LEVELS Measurement condition PWFY-P36NMU-E-BU Sound pressure level of PWFY-P36NMU-E-BU NC-70 3-1/4 ft. (1m) NC-60 NC-50 Measurement location NC-40 NC-30 NC-20 Approximate minimum audible limit on continuous noise Octave band center frequencies <Hz> dB(A) 60Hz 41.0...

  • Page 13: Vibration Levels

    7. VIBRATION LEVELS AIR TO WATER 7. VIBRATION LEVELS PWFY-P36NMU-E-BU Service panel Measurement location Concrete 7-7/8 in (200mm) 3-15/16 in (100mm) Model Vibration Levels[dBA] PWFY-P36NMU-E-BU MEES20K028...

  • Page 14: Operation Temperature Range

    8. OPERATION TEMPERATURE RANGE AIR TO WATER 8. OPERATION TEMPERATURE RANGE PWFY-P36NMU-E-BU R2-Series, R2-Series (High efficiency) Heating 15.5 Outdoor temp. [°FWB] Outdoor temp. [°CWB] WR2-Series Heating 15.5 Heat source unit circulating water [°F] Heat source unit circulating water [°C] H2i-Series (R2) Heating 15.5 Outdoor temp.
  • Page 15 8. OPERATION TEMPERATURE RANGE AIR TO WATER PWFY-P36, P72NMU-E2-AU Y-Series, Y-Series (High efficiency) Heating 15.5 Outdoor temp. [°FWB] Outdoor temp. [°CWB] WY-Series, WR2-Series Heating 15.5 Heat source unit circulating water [°F] Heat source unit circulating water [°C] R2-Series, R2-Series (High efficiency) Heating 15.5 Outdoor temp.
  • Page 16 8. OPERATION TEMPERATURE RANGE AIR TO WATER H2i-Series (R2) Heating 15.5 Outdoor temp. [°FWB] Outdoor temp. [°CWB] H2i-Series (Y) Heating 15.5 Outdoor temp. [°FWB] Outdoor temp. [°CWB] MEES20K028...
  • Page 17 8. OPERATION TEMPERATURE RANGE AIR TO WATER Y-Series, Y-Series (High efficiency), R2-Series, R2-Series (High efficiency), H2i-Series (R2) Cooling 15.5 Outdoor temp. [°FWB] Outdoor temp. [°CWB] WY-Series, WR2-Series Cooling 15.5 Heat source unit circulating water [°F] Heat source unit circulating water [°C] H2i-Series (Y) Cooling 15.5...

  • Page 18: Capacity Tables

    9. CAPACITY TABLES AIR TO WATER 9-1. Correction by temperature 9. CAPACITY TABLES Estimated performance without defrost R2-Series/R2-Series (High efficiency) + PWFY-P36NMU-E-BU Booster unit inlet-water temp. [°C] Booster unit inlet-water temp. [°F] Outdoor temp. [°FWB] Outdoor temp. [°CWB] MEES20K028...
  • Page 19 9. CAPACITY TABLES AIR TO WATER Booster unit inlet-water temp. 149°F/65°C 140°F/60°C 122°F/50°C 104°F/40°C 86°F/30°C 68°F/20°C 50°F/10°C Outdoor temp. [°FWB] Outdoor temp. [°CWB] Booster unit inlet-water temp. 104°F/40°C 122°F/50°C 86°F/30°C 140°F/60°C 68°F/20°C 149°F/65°C 50°F/10°C Outdoor temp. [°FWB] Outdoor temp. [°CWB] R2-Series BTU/h 120K...
  • Page 20 9. CAPACITY TABLES AIR TO WATER Estimated performance without defrost H2i-Series (R2) + PWFY-P36NMU-E-BU Booster unit inlet-water temp. [°C] Booster unit inlet-water temp. [°F] Outdoor temp. [°FWB] Outdoor temp. [°CWB] MEES20K028...
  • Page 21 9. CAPACITY TABLES AIR TO WATER Booster unit inlet-water temp. 149°F/65°C 140°F/60°C 122°F/50°C 104°F/40°C 86°F/30°C 68°F/20°C 50°F/10°C Outdoor temp. [°FWB] Outdoor temp. [°CWB] Booster unit inlet-water temp. 104°F/40°C 122°F/50°C 86°F/30°C 140°F/60°C 68°F/20°C 149°F/65°C 50°F/10°C Outdoor temp. [°FWB] Outdoor temp. [°CWB] H2i-Series (R2) BTU/h 120K...
  • Page 22 9. CAPACITY TABLES AIR TO WATER Y-Series + PWFY-P36, P72NMU-E2-AU Heating HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FWB] Outdoor temp. [°CWB] HEX unit inlet-water temp. 105°F/41°C 95°F/35°C 86°F/30°C 68°F/20°C 50°F/10°C Outdoor temp. [°FWB] Outdoor temp. [°CWB] BTU/h 120K 144K...
  • Page 23 9. CAPACITY TABLES AIR TO WATER Cooling HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FDB] Outdoor temp. [°CDB] HEX unit inlet-water temp. 95°F/35°C 86°F/30°C 77°F/25°C 73°F/23°C 68°F/20°C 59°F/15°C 50°F/10°C Outdoor temp. [°FDB] Outdoor temp. [°CDB] BTU/h 120K 144K...
  • Page 24 9. CAPACITY TABLES AIR TO WATER Y-Series (High efficiency) + PWFY-P36, P72NMU-E2-AU Heating HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FWB] Outdoor temp. [°CWB] HEX unit inlet-water temp. 105°F/41°C 95°F/35°C 86°F/30°C 68°F/20°C 50°F/10°C Outdoor temp. [°FWB] Outdoor temp.
  • Page 25 9. CAPACITY TABLES AIR TO WATER Cooling HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FDB] Outdoor temp. [°CDB] HEX unit inlet-water temp. 95°F/35°C 86°F/30°C 77°F/25°C 73°F/23°C 68°F/20°C 59°F/15°C 50°F/10°C Outdoor temp. [°FDB] Outdoor temp. [°CDB] BTU/h 120K 144K...
  • Page 26 9. CAPACITY TABLES AIR TO WATER H2i-Series (Y) + PWFY-P36, P72NMU-E2-AU Heating HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FWB] Outdoor temp. [°CWB] HEX unit inlet-water temp. 86°F/30°C 68°F/20°C 50°F/10°C 105°F/41°C Outdoor temp. [°FWB] Outdoor temp. [°CWB] BTU/h 120K 144K...
  • Page 27 9. CAPACITY TABLES AIR TO WATER Cooling HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FDB] Outdoor temp. [°CDB] HEX unit inlet-water temp. 95°F/35°C 86°F/30°C 77°F/25°C 73°F/23°C 68°F/20°C 59°F/15°C 50°F/10°C Outdoor temp. [°FDB] Outdoor temp. [°CDB] BTU/h 120K 144K...
  • Page 28 9. CAPACITY TABLES AIR TO WATER R2-Series + PWFY-P36, P72NMU-E2-AU Heating HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FWB] Outdoor temp. [°CWB] HEX unit inlet-water temp. 105°F/41°C 95°F/35°C 86°F/30°C 68°F/20°C 50°F/10°C Outdoor temp. [°FWB] Outdoor temp. [°CWB] BTU/h 120K 144K...
  • Page 29 9. CAPACITY TABLES AIR TO WATER Cooling HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FDB] Outdoor temp. [°CDB] HEX unit inlet-water temp. 95°F/35°C 86°F/30°C 77°F/25°C 73°F/23°C 68°F/20°C 59°F/15°C 50°F/10°C Outdoor temp. [°FDB] Outdoor temp. [°CDB] BTU/h 120K 144K...
  • Page 30 9. CAPACITY TABLES AIR TO WATER R2-Series (High efficiency) + PWFY-P36, P72NMU-E2-AU Heating HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FWB] Outdoor temp. [°CWB] HEX unit inlet-water temp. 105°F/41°C 95°F/35°C 86°F/30°C 68°F/20°C 50°F/10°C Outdoor temp. [°FWB] Outdoor temp.
  • Page 31 9. CAPACITY TABLES AIR TO WATER Cooling HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FDB] Outdoor temp. [°CDB] HEX unit inlet-water temp. 95°F/35°C 86°F/30°C 77°F/25°C 73°F/23°C 68°F/20°C 59°F/15°C 50°F/10°C Outdoor temp. [°FDB] Outdoor temp. [°CDB] BTU/h 120K 144K...
  • Page 32 9. CAPACITY TABLES AIR TO WATER H2i-Series (R2) + PWFY-P36, P72NMU-E2-AU Heating HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FWB] Outdoor temp. [°CWB] HEX unit inlet-water temp. 86°F/30°C 68°F/20°C 50°F/10°C 105°F/41°C Outdoor temp. [°FWB] Outdoor temp. [°CWB] BTU/h 120K 144K...
  • Page 33 9. CAPACITY TABLES AIR TO WATER Cooling HEX unit inlet-water temp. [°C] HEX unit inlet-water temp. [°F] Outdoor temp. [°FDB] Outdoor temp. [°CDB] HEX unit inlet-water temp. 95°F/35°C 86°F/30°C 77°F/25°C 73°F/23°C 68°F/20°C 59°F/15°C 50°F/10°C Outdoor temp. [°FDB] Outdoor temp. [°CDB] BTU/h 120K 144K...

  • Page 34: Correction By Total Indoor

    9. CAPACITY TABLES AIR TO WATER 9-2. Correction by total indoor Total capacity of PWFY-P36NMU-E-BU/P36, P72NMU-E2-AU Total capacity of indoor units [%] Total capacity of indoor units [%] Note Out of warranty at 50% or less due to unit's turn on-off. MEES20K028...

  • Page 35: Correction By Water Volume

    9. CAPACITY TABLES AIR TO WATER 9-3. Correction by water volume PWFY-P36NMU-E-BU 1.20 1.20 1.15 1.15 1.10 1.10 1.05 1.05 1.00 1.00 0.95 0.95 0.90 0.90 0.85 0.85 0.80 0.80 Booster unit water-volume [m Booster unit water-volume [m 1.20 1.15 1.10 1.05 1.00...
  • Page 36 9. CAPACITY TABLES AIR TO WATER PWFY-P36NMU-E2-AU Cooling 1.15 1.15 1.10 1.10 1.05 1.05 1.00 1.00 0.95 0.95 0.90 0.90 0.85 0.85 0.80 0.80 HEX unit water-volume [m HEX unit water-volume [m Heating 1.15 1.15 1.10 1.10 1.05 1.05 1.00 1.00 0.95 0.95...
  • Page 37 9. CAPACITY TABLES AIR TO WATER PWFY-P72NMU-E2-AU Cooling 1.15 1.15 1.10 1.10 1.05 1.05 1.00 1.00 0.95 0.95 0.90 0.90 0.85 0.85 0.80 0.80 HEX unit water-volume [m HEX unit water-volume [m Heating 1.15 1.15 1.10 1.10 1.05 1.05 1.00 1.00 0.95 0.95...

  • Page 38: Water Pressure Drop

    9. CAPACITY TABLES AIR TO WATER 9-4. Water pressure drop PWFY-P36NMU-E-BU (with strainer) PWFY-P36NMU-E-BU (with strainer) Water pressure drop of strainer Booster unit inlet-water volume [m PWFY-P36NMU-E-BU (with strainer) Water pressure drop of strainer Booster unit inlet-water volume [gpm] PWFY-P36, P72NMU-E2-AU (with strainer) PWFY-P36NMU-E2-AU (with strainer) Water pressure drop of strainer HEX unit inlet-water volume [m...

  • Page 39: Water Pressure Drop Of Strainer Only

    9. CAPACITY TABLES AIR TO WATER PWFY-P36NMU-E2-AU (with strainer) Water pressure drop of strainer HEX unit inlet-water volume [gpm] PWFY-P72NMU-E2-AU (with strainer) Water pressure drop of strainer HEX unit inlet-water volume [gpm] 9-5. Water pressure drop of Strainer only accessory for PWFY-P36NMU-E-BU and PWFY-P36, P72NMU-E2-AU Booster/HEX unit inlet-water volume [m Booster/HEX unit inlet-water volume [gpm] MEES20K028...

  • Page 40: Accessories

    10. ACCESSORIES AIR TO WATER PWFY 10. ACCESSORIES (A) Strainer (B) Heat insulation material (C) Washer × 2 (D) Expansion joint × 2 (E) Wire (F) Flow switch (G) Buffer material *1. PWFY-P72NMU-E2-AU only *2. PWFY-P36NMU-E-BU only (A) Install the strainer at the water pipe inlet. (B) This insulation is for exclusive use with the strainer.

  • Page 41: Optional Parts

    11. OPTIONAL PARTS AIR TO WATER 11-1. Remote controller 11. OPTIONAL PARTS PAR-W21MAA specifications : Each group : Not available Item Description Operations Display ON/OFF ON and OFF the operation of a group of units Switches between Hot Water/Heating/Heating ECO/Anti-freeze/Cooling Operation mode switching * Available operation modes vary depending on the unit to be connected.

  • Page 42: Electrical Work

    12. ELECTRICAL WORK AIR TO WATER 12-1. General cautions 12. ELECTRICAL WORK Electrical work should be done by qualified electrical engineers in accordance with "Engineering Standards For Electrical Installation" and supplied installation manuals. Special circuits should also be used. If the power circuit lacks capacity or has an installation failure, it may cause a risk of electric shock or fire.

  • Page 43: 12-3.Power Cable Specifications

    12. ELECTRICAL WORK AIR TO WATER 12-3. Power cable specifications Minimum wire thickness (mm /AWG) Switch (A) 1-phase 2-wire, Breaker for wiring Breaker for current leakage 208/230V,60Hz (NFB) Main cable Branch Ground Capacity Fuse 25A 30mA or 100mA PWFY-P36NMU-E-BU 2.5/12 2.5/12 0.1sec.

  • Page 44: 12-4.Connecting Remote Controller, Indoor And Outdoor Transmission Cables

    12. ELECTRICAL WORK AIR TO WATER 12-4. Connecting remote controller, indoor and outdoor transmission cables Connect unit TB5 and outdoor unit TB3. (Non-polarized 2-wire (shield)) The "S" on unit TB5 is a shielding wire connection. For specifications about the connecting cables, refer to the outdoor unit installation manual.

  • Page 45: 12-5.Connecting Electrical Connections

    12. ELECTRICAL WORK AIR TO WATER 12-5. Connecting electrical connections Verify that the model name on the operating instructions on the cover of the control box is the same as the model name on the nameplate. Remove the screws holding the terminal box cover in place. ▪PWFY unit (A) Screws (B) Front panel...

  • Page 46: Control

    13. CONTROL AIR TO WATER 13-1. Transmission cable specifications 13. CONTROL Transmission cables PWFY-P36NMU-E-BU Transmission cables MA Remote controller cables External input External output Sheathed multi-core cable Sheathed multi-core cable Shielding wire (2-core) Sheathed 2-core cable (shielded) Type of cable (shielded) (unshielded) CVVS, CPEVS or MVVS...

  • Page 47: 13-2.Indoor Unit Address Setting

    13. CONTROL AIR TO WATER 13-2. Indoor unit address setting (Be sure to operate with the main power turned OFF.) <Address board> SWU2 SWU1 SWU3 13-2-1. Switch operation (BC controller) There are two types of rotary switch setting available: setting addresses 1 to 9 and over 10, and setting branch numbers. a) How to set addresses Example: If Address is "3", SWU2 (for over 10) remains at "0", and match SWU1 (for 1 to 9) to "3".
  • Page 48 13. CONTROL AIR TO WATER External input terminal The piping length must be within 100 m. External input terminal (refer to [Fig. 1-7-B]) is ineffective when the circuit is open. Refer to [Table 2] through [Table 4] for information about each contact. Only the "pump interlock"...

  • Page 49: Piping Design

    14. PIPING DESIGN AIR TO WATER 14-1. Refrigerant charging calculation (PWFY-AU with R2 system or H2i R2 system) 14. PIPING DESIGN It is needed to add extra refrigerant if the system is under the following conditions. See the attachment for how to decide the amount of refrigerant to be added to each outdoor unit. The graph below shows an example.
  • Page 50 14. PIPING DESIGN AIR TO WATER PURY-P168 PURY-(H)P192 [1,640] [1,640] [1,476] [1,476] [1,312] [1,312] [1,148] [1,148] Additional [984] [984] Additional Refrigerant [820] [820] Refrigerant [656] [656] [492] [492] OK Zone OK Zone [328] [328] [164] [164] [56] [67] [78] [89] [100] [111] [122]...

  • Page 51: Installation

    15. INSTALLATION AIR TO WATER 15-1. How to calculate the necessary heating capacity 15. INSTALLATION Heating capacity calculation (Unit: °F/BTU/G) A. For Air conditioning using such as Panel Heaters, Floor Heating and Fan coil units Required total heating capacity Safety factor; PWFY unit Tank B.
  • Page 52 15. INSTALLATION AIR TO WATER Heating capacity calculation (Unit: °C/kW/ℓ) A. For Air conditioning using such as Panel Heaters, Floor Heating and Fan coil units Required total heating capacity Safety factor; PWFY unit Tank B. For Sanitary use such as Shower and Bathrooms Conditions Tank inlet water Temp.;...

  • Page 53: 15-2.Selecting An Installation Site

    15. INSTALLATION AIR TO WATER 15-2. Selecting an installation site  Do not install outdoors. The unit is not waterproof.  Back up system is recommended in case of PWFY unit breakdown.  The unit will get hot. Do not install in a location where heat gets trapped inside. ...

  • Page 54: 15-4.Installing The Unit

    15. INSTALLATION AIR TO WATER 15-4. Installing the unit 15-4-1. Lifting method Be very careful when carrying the product. - Do not have only one person to carry product if it is more than 45 lbs (20 kg). - Do not tilt the unit while transporting. - PP bands are used to pack some products.

  • Page 55: 15-5.Refrigerant Pipe And Drain Pipe Specifications

    15. INSTALLATION AIR TO WATER 15-5. Refrigerant pipe and drain pipe specifications 15-5-1. Refrigerant pipe and drain pipe specifications To avoid dew drops, provide sufficient anti-sweating and insulating work to the refrigerant and drain pipes. When using commercially available refrigerant pipes, be sure to wind commercially available insulating material (with a heat-resisting temperature of more than 212 °F (100 °C) and thickness given below) onto both liquid and gas pipes.

  • Page 56: 15-6.Connecting Refrigerant Pipes And Drain Pipes

    15. INSTALLATION AIR TO WATER 15-6. Connecting refrigerant pipes and drain pipes 15-6-1. Refrigerant piping work This piping work must be done in accordance with the installation manuals for both outdoor unit and BC controller (simultaneous cooling and heating R2-Series). ...
  • Page 57 15. INSTALLATION AIR TO WATER 15-6-2. PWFY-AU in cooling operation (Y, H2i Y, WY system) Add brine, assuming that the temperature will drop to -4°F (-20°C). Set Dip SW 1-10 (on ATW unit) to ON if brine is added. * With the WY system, the above steps apply only when operating the WY at the water temperature below 50°F (10ºC). Cautions On Refrigerant Piping ...

  • Page 58: 15-7.Water Pipe Installation

    15. INSTALLATION AIR TO WATER 15-7. Water pipe installation Water circuit sample Solid arrows in the figure indicate Roof the direction of water flow. Overflowed water City water To drain outlet PWFY Field supply Uphill gradient ≥ 1/200 Water-side Tank heat exchanger Tank Outlet...
  • Page 59 15. INSTALLATION AIR TO WATER Caution for water pipe installation Consider the following when designing and installing a water piping system.  Do not use steel pipes as water pipes. - Copper pipes or stainless steel pipes are recommended. If iron pipes are used in the existing system, do not connect a new circuit to the old one.
  • Page 60 15. INSTALLATION AIR TO WATER Example of unit installation [Fig. 3-1-B] (C) (G) (A) Close valve (B) Water inlet (C) Water outlet (D) Refrigerant piping (E) Y-type strainer (F) Drain pipe (G) Expansion joint Insulation installation The surface temperature of the water pipe would be very high, depending on the set temperature. Insulate the pipe to prevent burns.
  • Page 61 15. INSTALLATION AIR TO WATER Installation procedures 1) Remove the pipes attached to the flow switch. Note: The unit is shipped with the pipes loosely tightened. 2) Wrap seal tape around the threads at the end of the pipes, starting at the 1.5th or 2nd thread, and not over the openings. Apply two to three wraps in the direction of the pipe threads (clockwise).
  • Page 62 15. INSTALLATION AIR TO WATER Water processing and water quality control To preserve water quality, use the closed type of cooling tower for unit. When the circulating water quality is poor, the water heat exchanger can develop scales, leading to a reduction in heat-exchange power and possible corrosion of the heat exchanger.
  • Page 63 15. INSTALLATION AIR TO WATER Brine When (a) PWFY-AU is used for cooling purpose, or (b) PWFY-AU is installed in the temperature condition below freezing temperature, Brine is required to add. Set Dip SW 1-10 (on ATW unit) to ON if brine is added. [41] [32] [23]...
  • Page 64 15. INSTALLATION AIR TO WATER Pump interlock The unit may become damaged if it is operated with no water circulating through the pipes.Be sure to interlock unit oper- ation and the water-circuit pump. In the system including PWFY-P36NMU-E-BU, use the terminal blocks for interlocking TB142A (IN1) that can be found on the unit.
  • Page 65 AIR TO WATER MEES20K028...
  • Page 66 - Doing so may cause the unit or pipes to burst, or result in explosion or fire during use, repair, or at the time of disposal of the unit. - It may also be in violation of applicable laws. - MITSUBISHI ELECTRIC CORPORATION cannot be held responsible for malfunctions or accidents resulting from the use of the wrong type of refrigerant.

This manual is also suitable for:

City multi pwfy-p36nmu-e2-auCity multi pwfy-p72nmu-e2-au

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