Project Name
Project Reference
Quote Reference
Prepared By
EXAMPLE
Mitsubishi Electric
CAHV-R450YA-HPB
Air Source Heat Pump
Primary School
PSDS PHASE 3A
Project Reference:
Primary School
0 0
General
CAHV-R450YA-HPB
Technical Selection
i. Air Source Heat Pumps will defrost the outdoor unit heat exchanger coil in periods of low ambient temperature such that
condensate will be discharged – adequate provision should be made to prevent this condensate from collecting around the unit
and pipework to avoid freezing, such as a soak away or drip try , which can cause a Health & Safety risk.
ii. If the unit is continuously operated for a long time with the outside air temperature below the freezing point, install a heater
at the base of the unit to prevent the water from freezing at the unit bottom
iii. All water systems should be designed, installed and commissioned in accordance with industry good practice guidelines; such
as, but not limited to: BSRIA Guide BG2/2010 – Water System Commissioning, BSRIA Guide BG29/2021 – Pre-Commissioning of
Pipework Systems, BSRIA Guide BG50/2021 – Water Treatment for Closed Heating & Cooling Systems, CIBSE Commissioning
Code W – Water distribution systems.
iv. Air Source Heat Pumps are designed to produce low pressure hot water which may be used in a variety of applications – it is
your responsibility to check that the equipment proposed is suitable for the specific design and application intent.
v. Air Source Heat Pumps perform more efficiently by utilising low water flow temperatures and also making use of weather
compensation.
vi. Mitsubishi Electric takes no design responsibility or liability for the system, components, equipment selections or control
strategy – it is your responsibility to check the suitability of the proposed equipment selections.
vii. It is your responsibility to check that the Equipment selections parameters, as laid out in the Technical Submission
document, are as provided by yourselves.
viii. In order to comply with the Mitsubishi Electric warranty requirements all Mitsubishi Electric products must have adequate
planned preventative maintenance undertaken in accordance with our recommendations.
ix. To meet Mitsubishi Electric’s warranty requirements a suitable method of filtration must be provided within the system. In
addition, each Air Source Heat Pump must be provided with a strainer (minimum 20 mesh), line size flushing bypass, isolating
valves and flow protection device. The flow protection device can be either a flow switch or differential pressure switch, with
the preferred method being a differential pressure switch.
x. The recommended water flowrates must be maintained at all times when the equipment is operating. Particular attention
should be paid to any change in pressure drop due to glycol and start up temperatures. Operating the equipment with less than
the recommended flowrate will invalidate the warranty.
xi. It is recommended that glycol is used for protection of the low pressure hot water heating circuit to protect against freezing
– should glycol anti-freeze protection not be used, another suitable form of frost protection must be employed to adequately
protect the water circuit. If the water circuit freezes and damages the equipment the warranty will become void.
Project Reference:
Primary School
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0
Application
Outdoor Temperature Condition ⁰C -10
Water Inlet Temperature ⁰C 65
Water Outlet Temperature ⁰C 70
Glycol Ethylene
0
Concentration of Glycol % 30
30
Freeze Protection Temperature ⁰C -10
Number of Units No. 3
Total Deliverable Capacity by Units kW 89.2
COP (at design condition & 100% load) 1.2
SCOP (Low/Medium) 3.57/3.24
Number of Controllers (PAR-W31MAA) No. 1
Water Requirments
Minimum Flow Rate (per Unit) l/s 1.9
Recommended Pipe Size (to unit)* mm 54
Header Pipe Thermistor No. 1
Total Required Flow Rate l/s 5.7
Main Header Recommended Pipe Size* mm 76
Pressure Drop (through CAHV) kPa 11.2
*pipe sizing is based on copper.
Selection Results
Gas Boiler replacement
Design Conditions
CAHV-R450YA-HPB
Project Reference:
Primary School
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0
Operating capacity: 100%
Capacity of Unit kW 29.7
Input Power per Unit kW 24.7
COP 1.2
Operating capacity: 75%
Capacity of Unit kW 28.3
Input Power per Unit kW 24.9
Operating capacity: 50%
Capacity of Unit kW 18.5
Input Power per Unit kW 16.7
Operating capacity: 25%
Capacity of Unit kW 8.8
Input Power per Unit kW 8.6
Operating capacity: Lower limit
Capacity of Unit kW 1.7
Input Power per Unit kW 4.3
CAHV-R450YA-HPB
Efficiency Priority Mode - Part Load per Unit
Project Reference:
Primary School
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Refrigerant
Refrigerant Type R454C
GWP per Unit 148
Charge per Unit kg 9
Equivalent CO
2
Emissions per Unit
kg 1332
Compressors
Compressor Type Inverter Scroll Hermetic Compressor
Starting Method Inverter
Number of Compressors per Unit No. 1
Compressor Motor Output (per Compressor) kW 12.1
Heat Exchanger
Heat Exchanger Type Stainless Steel Plate
Minimum Water Circuit Volume per Unit Litres 525
Total Minimum Water Circuit Volume Litres 1575
Fans
Fan Type Propeller Fan
Starting Method Inverter
Number of Fans per Unit No. 2
Total Airflow per Unit l/s 5000
Fan Motor Output (per Fan) kW 0.92
Available External Static Pressure Pa 10
Electrical Data
Power Supply per Unit V/ph/Hz 380-415V/3-phase/50-60Hz
Max Total Current A 120.9
Max Current per Unit A 40.3
Weight & Dimensions
External dimensions (H × W × D) per Unit mm
Net Weight per Unit kg 359
CAHV-R450YA-HPB
1710 × 1750 × 740
Project Reference:
Primary School
0 0
Recommended Pipe Size
Number of Units: 3
Flow Rate per Unit l/s 1.9
Number of Units 3
Total Flow Rate* l/s 5.7
Pressure Drop** kPa 11
Recommended Pipe Size (mm): 54
Required Flow Rate per Unit (l/s): 1.9
* With Main header
** Including Glycol
76
5.7
Optional parts
Install the strainer at the water pipe inlet
External-water temperature sensor
(TW-TH16)
CAHV-R450YA-HPB
Pipe work sizing is the responsibility of the
installing contractor and consultant. All pipe
work sizes are based on CIBSE design conditions
and water systems should be commissioned in
accordance with the latest CIBSE Commissioning
Code W for Water. All water should be cleaned
and treated in accordance with BSRIA BG
29/2021 Pre-
Commissioning Cleaning of Pipework Systems All pipe sizes are based on copper to BS EN 1057.
Horizontal installation
Strainer
Multiple Unit Cascade
up to 16 Units
Main Header Flow Rate (l/s):
Project Reference:
Primary School
0 0
Example Schematic
Water Filtration
Strainer Magnetic Filter Air Dirt Separator
20 Mesh or More (Minimum) Recommended if steel pipe Minimum
Minimum-Without this filtration method the installations risks not receiving full warranty.
CAHV-R450YA-HPB
Recommended -This filtration method has recognised benefits for this type of system but its inclusion will not
affect warranty.
Project Reference:
Primary School
0 0
Noise Level
Measurment Position for Sound Pressure Level
Sound Pressure Level: 64/72 dB (COP Priority Mode/Capacity Priority Mode)
Opetation condition: COP Priority Mode: 7°CDB/6°CWB, Inlet water temp.: 40°C, Outlet water temp. 45°C
Operation Window
CAHV-R450YA-HPB
-25, 40
-25, 65
-20, 70
43, 70
43, 24
10, 24
10, 25
2, 25
-10, 35
-20, 35
0
10
20
30
40
50
60
70
80
-30 -20 -10 0 10 20 30 40 50
Water Temp (
0
C)
Outdoor Temp (
0
C)
Project Reference:
Primary School
0 0
Dimensions
CAHV-R450YA-HPB
Unit: mm
Project Reference:
Primary School
0
0
Specifications
Multiple units can be connected together by a shielded 2 core cable and controlled using the inbuilt
supplied control logic. Up to 16 units can be piped together delivering up to 534.4kW at -5°C. The
inbuilt logic will cascade the units on and off based on the load and also deliver an optimised cascade
based on compressor frequency and COP. Backup and rotate will allow for even wear of the system
whilst also providing backup within a single unit and within a multiple unit installation. The SCOP
(Low/Medium) is 3.57/3.24 at outdoor temperature of 7°CDB, the outlet water temperature of 45°C.
A minimum circuit size of 525litres per unit is required and all pipe work should be installed in
accordance with related BS regulations and the Mitsubishi Electric design guide. The refrigeration
process of the CAHV unit will be maintained by pressure and temperature sensors controlling check
joints and four-way valves.
The CAHV unit has a max running current of 40.3 Amps and requires a 380V-415V AC 3 phase and
neutral 50A mains supply. Control will be via a 30V DC signal generated by the outdoor unit. This
signal will be sent to other outdoor units in its group via a 2-core non polar screened cable.
Control of the system is via volt free inputs and outputs into the BEMS/BMS. An error signal will alert
the BMS and through interrogation of the PAR W31MAA. Flow or return temperatures can also be
monitored via the PAR W31MAA.
CAHV-R450YA-HPB
The outdoor unit will be constructed from steel
plate and painted with acrylic paint Munsell 5Y
8/1 and is a packaged type inverter driven air to
Water heat pump capable of delivering an
integrated (with defrost) capacity of 33.4kW at -
5°C ambient temperature and 55°C outlet water
temperature.
The single unit heat pump is made up of one
scroll compressor hermetically sealed refrigerant
circuits utilising R454c as a low GWP (148)
refrigerant.
Water temperatures shall be between 24°C and
70°C and the unit is capable of working between
ambient temperatures of -25°CDB and +43°CDB.
Project Reference:
Primary School
0 0
Import to Read
IMPORTANT: Please read and observe our “Safety precaution” warnings and cautions and any warnings
included within the Technical guidance set out in the relevant equipment data book before you carry out any
function on the product. This output is based upon the best available information but is given as indicative
guidance only and should not be considered as final system design. We recommend that the information in this
Technical Proposal Form is read in conjunction with the latest equipment data book and installation manual at
all times. All water systems should be designed, installed and commissioned in accordance with good practice
guidelines; such as, but not limited to: BSRIA Guide BG2/2010 – Water System Commissioning, BSRIA Guide
BG29/2021 – Pre-Commissioning cleaning of Pipework Systems, BSRIA Guide BG50/2021 – Water Treatment
for Closed Heating & Cooling Systems, CIBSE Commissioning Code W – Water distribution systems.
Mitsubishi Electric takes no design responsibility or liability for the system, components, equipment selections
or control strategy – it is your responsibility to check the suitability of the proposed equipment selections. In
order to comply with the Mitsubishi Electric warranty requirements all Mitsubishi Electric products must have
adequate planned preventative maintenance undertaken in accordance with our recommendations. To meet
Mitsubishi Electric’s warranty requirements a suitable method of filtration must be provided within the system
– please refer to installation manual available from the document library. The recommended water flow rates
must be maintained at all times when the equipment is operating. Particular attention should be paid to any
change in pressure drop due to glycol and start up temperatures. Operating the equipment with less than the
minimum flow rate will invalidate the warranty.
The temperatures, capacity de-rates and pressure drop based on glycol concentration will vary between
manufacturers. We also remind you of our quotation texts:
This quotation is given by Mitsubishi Electric in good faith based upon information provided by you or your
company. We have not undertaken a site survey to support this quotation. Whilst we endeavour to factor into
our quotation any special site conditions or user requirements which you may have expressly identified to us
previously in writing, this quotation is not a project system design and is not a confirmation of project
volumetric or yield analysis. We recommend that you assess final product selection and make the final system
design based upon your own volumetric or yield analysis and project knowledge, including any project
requirements which might impact on that selection. Please check carefully any requirement for a Mitsubishi
Electric product to integrate with any third party equipment. We are not responsible for integration capability
of our products with any third party equipment unless we have expressly confirmed that this integration is
approved in the current Mitsubishi Electric product specification or in a current technical bulletin.
CAHV-R450YA-HPB