Mitsubishi Electric ATW Booster Unit - PWFY-P100VM-E1-BU
Product Overview
The ATW Booster Unit, model PWFY-P100VM-E1-BU, is designed to leverage the heat recovery operation of the CITY MULTI R2 system. It efficiently converts energy from the air to generate higher temperature hot water with minimal energy waste. This unit is ideal for applications requiring sanitary water and showers.
Key Features:
- Operation up to 70°C
- Connectable to CITY MULTI R2 Series
- Utilizes waste heat from cooling operations for hot water production
System Outline and Operation
The booster unit connects to a BC controller via refrigerant pipes and to a water tank via water pipes. During cooling operations, waste heat is captured and utilized for heating water.
Refrigerant Flow:
- High-pressure R410A gas refrigerant from the BC controller enters the Booster Unit.
- Inside the unit, R134a refrigerant circulates through two plate heat exchangers. Low-pressure R134a liquid refrigerant is compressed by the internal compressor, increasing its temperature and pressure.
- Water entering the Booster Unit exchanges heat with the high-pressure R134a gas refrigerant, becoming hot water that circulates to heat the water in the tank.
Refrigerant Color Coding:
- Red: High pressure gas refrigerant
- Orange: High pressure 2-phase refrigerant
- Green: High pressure liquid refrigerant
- Blue: Low pressure gas refrigerant
BC Controller
A BC controller is required to connect R2 Series outdoor units and ATW indoor units. Available models include:
- CMB-M104-M1016V-J1
- CMB-M108-M1016V-JA1
- CMB-P1016V-KA1
- CMB-M104, 108V-KB1
BC Controller Specifications:
| Feature | Details |
| Connectable ATW system | Booster |
| Connectable series | R2 |
| Outdoor unit connectable capacity | P200-P1100 |
| Outdoor unit connectable quantity | 1-50 |
| ATW/Indoor unit connection method | With a BC port |
| Operation mode | Cooling AND heating |
Case Study: Restaurant in Italy
A restaurant required air conditioning, fresh air, and sanitary hot water. The proposed solution utilized the Air to Water system combined with CITY MULTI and an OA processing unit. This system provided hot water without a boiler and efficient air conditioning with a high COP, along with quality ventilation and energy savings.
Unit Configuration:
- Outdoor units: Air-cooled R2-Series x 5
- BC controllers: x 5
- ATW units: Booster unit x 3
- Indoor units: Floor mounted concealed type x 18
- Control systems: AG-150A x 1, ATW controller x 3, ME remote controller x 27, Power supply unit x 1
- Other: OA processing unit x 9
Application Examples
ATW systems are chosen for their versatility across various applications:
Restaurants
Reason for ATW: Constant hot water requirement in kitchens. Waste heat from kitchens can be used for cooling dining areas in summer, increasing system efficiency.
Health Clubs
Reason for ATW: Gym spaces require year-round cooling. Swimming pools and shower rooms necessitate hot water availability.
Offices
Reason for ATW: Accommodates diverse tenant needs for cooling, heating, and hot water throughout the year. Waste heat from cooling operations in areas with high computer density can be repurposed for hot water in small kitchens during winter. In summer, cooling can be provided to all areas while hot water is available.
Residences
Reason for ATW: Continuous hot water supply for showers and kitchens year-round. Can also be used for underfloor heating in winter and cooling in summer.
Technical Specifications: Booster Unit PWFY-P100VM-E1-BU
| Parameter | Specification |
| Model | PWFY-P100VM-E1-BU |
| Power source | 1-phase 220-230-240V 50/60Hz |
| Heating capacity (Nominal) | 12.5 kW (42,700 BTU/h) |
| Power input | 2.48 kW |
| Current input | 11.63-11.12-10.66 A |
| Temp. range of heating (Outdoor unit condition) | -20 to 32°C (-4 to 90°F) W.B. (R2-Series) |
| Booster unit inlet water temp. | 10 to 70°C (50 to 158°F) |
| Connectable outdoor unit total capacity | 50-100% of outdoor unit/heat source unit capacity |
| Connectable outdoor unit models | PURY-(E)P+Y(S)NW-A2(-BS), PQRY-P+Y(S)LM-A1/A2 |
| Sound pressure level | 44 dB(A) |
| Refrigerant pipe diameter (Liquid) | Ø9.52 mm (Ø3/8") Brazed |
| Refrigerant pipe diameter (Gas) | Ø15.88 mm (Ø5/8") Brazed |
| Water pipe diameter (Inlet) | R3/4 |
| Water pipe diameter (Outlet) | Rc3/4 |
| Field drain pipe size | Ø32 mm (1-1/4") |
| External finish | NO |
| External dimensions (H x W x D) | 848 (833 without legs) x 450 x 300 mm (33-7/16" (32-13/16" without legs) x 17-3/4" x 11-13/16") |
| Net weight | 63 kg (138 lbs) |
| Compressor Type | Inverter rotary hermetic compressor |
| Compressor Starting method | Inverter |
| Compressor Motor output | 1.0 kW |
| Compressor Lubricant | NEO22 |
| Circulating water Operation volume Range | 0.6-2.15 m³/h |
| Protection on internal circuit (R134a) | High pressure sensor, High pressure switch at 3.60 MPa (601 psi) Over-heat protection, Over-current protection Discharge thermo protection, Over-current protection |
| Refrigerant Type x original charge | R134a x 1.1 kg (0.50 lb) |
| Refrigerant GWP | 1,430 |
| Refrigerant CO₂ equivalent | 1.6 t |
| Refrigerant Control | LEV |
| Design pressure (R410A) | 4.15 MPa |
| Design pressure (R134a) | 3.60 MPa |
| Design pressure (Water) | 1.00 MPa |
| Drawing (External) | WKB94C7Q4 |
| Drawing (Wiring) | WKE94L369 |
| Standard attachment (Document) | Installation Manual, Instruction Book |
| Standard attachment (Accessory) | Strainer, Heat insulation material, Wire x 1 set |
| Optional parts | NONE |
| Remark | Refer to the Installation Manual for details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other items. |
Notes:
- *1 Nominal heating conditions for R2-Series: Outdoor Temp. 7°CDB/6°CWB (45°FDB/43°FWB), Pipe length 7.5 m, Level difference 0 m, Inlet water Temp. 65°C (149°F), Water flow rate 2.15 m³/h.
- *2 Use only the specified refrigerant type. Using incorrect refrigerant can lead to unit damage, fire, or explosion, and may violate laws. Mitsubishi Electric is not liable for issues arising from the use of incorrect refrigerants.
- *3 Values based on Regulation (EU) No.517/2014.
- Specifications are subject to change without notice due to continuous improvement.
- The unit is not designed for outdoor installation.
- Do not use steel material for water piping.
- Ensure water circulation or add brine when ambient temperature is 0°C (32°F) or below.
- Ensure water circulation or drain the unit completely when not in use.
- Do not use groundwater or well water.
- Install the Outdoor unit (R2-Series) in an environment where the wet bulb temperature does not exceed 32°C (90°F).
- The water circuit must be a closed circuit.
- Do not use for drinking water.
Unit Converter:
- BTU / h = kW × 3.412
- cfm = m³/min × 35.31
- lbs = kg / 0.4536
Specification data may include rounding variations.
