What's new with CITY MULTI

Our current LGH-RVX-E Range of Fresh Air Energy Recovery Ventilation Systems have a treated, permeable paper energy recovery core. This core allows the transfer of heat and water vapour while preventing the transfer of gases.

So what sets the LGH Lossnay apart from other Ventilation Systems?

Total heat recovery

• Energy recovery through the permeable core not only recovers sensible heat but also latent heat from humidity in the air, further reducing load on HVAC plant and saving on energy consumption.

Excellent energy recovery rates even in low temperatures

• Lossnay’s total energy recovery rate is typically in the order of 70% ~ 75%. This is higher than common efficiencies seen for a solid core ventilator which transfers sensible heat only.
• At 0°C outdoor air temperature, and a space temperature of 20°C, supply air from a Lossnay unit can be around 16°C – which is warm enough to supply directly to a fan coil unit without any expensive additional top up heating.

Optimised humidity management

• Transferring latent heat (humidity) also helps maintain an acceptable relative humidity within the occupied space. With Lossnay, air introduced into the space is closer to the space humidity than other uncontrolled ventilators. Without Lossnay, air is typically preheated and humidified in Winter and precooled and dehumidified in Summer.

Standard Bypass Damper removing the need for additional controls

• All LGH Lossnay units come standard with a Bypass Damper allowing for free cooling and night purge. Internal settings also prevent the unit from operating on bypass when supply air will be below an acceptable temperature.
• Lossnay is able to communicate with Mitsubishi Electric Air Conditioning units allowing for the Bypass Damper to provide free cooling based on the connected indoor units mode of operation. This removes the need for any expensive additional controls.

Minimised riser space

• Air processing locally removes the need for large roof mounted air handling units. Riser space can also be minimised by using smaller intakes closer to the space.

Reduced running cost

• Lossnay removes issues associated with traditional methods of supplying untreated fresh air in summer and utilising electric heater banks for Winter. These old methods are no longer seen as acceptable as they commonly cause high running costs in Winter and problems such as poor cooling performance and condensate dripping from supply duct / grilles in Summer.

Very quiet operation

• LGH Lossnay’s are quiet in operation with even the largest unit only producing 41dBA at 1.5m below the unit on high fan speed.

Air filtration

• Outside and Exhaust Air Filters are provided as standard for core protection. An optional high efficiency filter can be fitted into the unit to filter the supply air to rating F7 (EU7).

Easy service access

• Service accessibility is required to one side of the unit only. The electrical panel, core and filters can all be accessed through the one access panel.

Functional controls

• PZ-61DR-E Wall Controller allows for the following additional functionality:
  - Display of outside air, exhaust air and calculated supply air temperature.
  - Function settings allow for fan speeds to be increased slightly to achieve airflow if slightly short.

Advanced Co₂ Control and Air Pressure Control

• Inbuilt logic allows CO₂ control through input via a third party 0-10V CO₂ Sensor.
• Positive or negative pressure can be achieved by offsetting supply and exhaust fan speeds.
• Test data for gas transmission shows this is very low - less than 3% for all gases tested.
• Test data for bacterial transmission shows no bacteria is transferred between the exhaust and supply air streams.

For more information on our Lossnay or other Mitsubishi Electric Ventilation Products, please contact your local Sales Engineer.

We know Dealers choosing Mitsubishi Electric City Multi Variable Refrigerant Flow (VRF) Systems for projects comes down to more than just being the best quality and value. Dealers promoting the use of Mitsubishi Electric for projects need to provide clients with peace of mind for their HVAC investment.

That is why BDT developed a local, nationwide Technical Services Team who provides industry-leading support to Dealers. This is also why our warranty includes labour, because we understand how this can affect a business if their time is not accounted for when rectifying warranty claims.

This mutual trust and commitment between us and our Dealers has lead BDT to go one step further with an Extended Full Parts and Labour Warranty Programme on the EP, PUMY and HVRF Ranges. Offering warranties that go beyond one year is about providing our Dealers further assurance when selecting Mitsubishi Electric City Multi VRF Systems for their clients.

The extended warranty period applies to all new orders placed from 15th August 2018 onwards for the following product ranges:

Hybrid VRF (HVRF)
PURY / PQRY (air and water source) HVRF Systems including indoor units
Now 3 Year Full Parts and Labour Warranty*

HVRF is a 2-pipe heat recovery VRF with water between the Hybrid Branch Circuit (HBC) Controller and indoor units. You can install and design it as VRF whilst enjoying the features of a chiller system. This provides a complete modern solution for office buildings, hotels, medical centres, schools, high-rise buildings, shopping centres and other commercial premises.

R2 and Y High Efficiency Series
PURY-EP / PUHY-EP Systems including indoor units
Now 3 Year Full Parts and Labour Warranty*

EP models have increased heat exchange efficiencies of up to 30% as they are manufactured with a high quality aluminium flat tube heat exchanger, increasing surface contact area yet maintaining the same footprint as standard heat exchangers. This significantly improves energy saving performance.

S Series
PUMY-P-V(Y)KM VRF Systems including indoor units
Now 5 Year Full Parts and Labour Warranty

The City Multi S Series is ideal for small commercial applications and makes use of a two-pipe refrigerant system, which allows for system changeover from cooling to heating. It is the all-in-one air conditioning solution for large residences or offices with multiple rooms (nominal 12.5 - 15.5kW cooling / 14.0 - 18kW heating).

For further conditions please contact your local City Multi Sales Engineer.

*As a condition to this Extended Full Parts and Labour Warranty Programme, Dealers will need to ensure quarterly maintenance checks are made on these product installations with the Maintenance Check Sheet, which is attached.

This controller is able to offer a lot more functionality through additional hardware and licensing.

BACnet connection to a Building Management System (BMS) using licensing. This allows up to 200 indoor units to connect to a BMS through one BACnet license installed into the AE200 and subsequent expansion controllers without the need for expensive additional hardware.

Power Apportioning – The system utilises third party electrical pulse meters to measure the power usage of each outdoor unit via the PAC-YG60MCA-J PI controller. The power used is then assigned to each indoor unit based on the usage over that time. This can be used to assign power usage to individual units for on billing. This can now be achieved without the need for TG2000 software by exporting CSV data directly from the AE200 onto a USB which can be edited on a PC using the Charge Calculation Tool. The data can also be communicated to a BMS over BACnet using the BACnet license.

PI Controller – Third party electrical, water or gas pulse meters can be inputted into the system through our PAC-YG60MCA-J PI controller. This information can be displayed on screen or outputted to a CSV file on a USB enabling the end user to monitor building energy consumption.

AI Input Controller – Third party temperature and humidity sensors can be monitored using our PAC-YG63MCA-J and displayed on the AE200. Trending can be viewed over the AE200 web interface. An alarm output by email can be generated when measurement exceeds a preset upper or lower limit.

DIDO Controller – Control and Fault monitoring of external items can be achieved using our PAC-YG66DCA-J DIDO controller. This allows third party items to be time scheduled through the AE200 similar to an air conditioning unit or to be interlocked to any air conditioning unit connected to the AE200. This also allows indoor units to be turned on and off from an external input such as a security system.

Alpha2 PLC – The AE200 can connect to our Mitsubishi Electric PLC through our AHC adaptor. This allows for simple logic to be applied to third party digital or analogue inputs or sensor data of any air conditioning unit connected to the AE200. This logic can then be used to control digital or analogue outputs or any air conditioning unit connected to the AE200.

For more information on any of the above functionality please contact your local City Multi Sales Engineer.

Launched at the City Multi Conference last year the VRF YNW Range offers further energy efficiencies with EP Models which retain the unique flat tube aluminium micro-channel heat exchanger, a pivotal step in providing more effective and efficient heat transfer.

YNW Range alleviates some of the legislative concerns (AS/NZS 5149:2106) regarding the critical concentration limit of refrigerant in occupied spaces, due to the significantly reduced refrigerant charge needed to produce the same rated output compared with previous models.

The YNW Range uses a newly designed four-sided heat exchanger mounted on the upper-part of the module which decreases energy usage and increases the heat exchanger’s efficiency. The multiplier effect created by increasing the number of coil faces from three to four surfaces greatly improves the operational efficiency.

The YNW Range offers advanced heat exchangers on their standard models, incorporating copper tube aluminium fins; while high efficiency EP models incorporate the flat-tube aluminium heat exchanger, increasing the surface area of the coil for even higher efficiencies. The inside of the flat tube is divided into thin compartments which increase the area of contact between refrigerant and air, leading to a significant improvement in energy-saving performance.

YNW Range maximises the space available for plant by reducing the area required for outdoor units. Up to 51kW of cooling capacity can be delivered per square metre of plant thanks to the advanced wrap around the heat exchanger.

Greater flexibility for location of outdoor units is possible thanks to multiple external static pressure settings. Extending up to 80Pa will help with long or narrow ducting requirements.

Exclusive to the City Multi VRF YNW Range, the improved compressor with centrifugal force cancelling mechanism enables the speed to increase to 140 revolutions per second – speeding up start-up operation and offering improved part load performance.

These characteristics offer the most intelligent and reliable inverter scroll compressors on the market.

The YNW Range features adjustable logic settings such as Low Noise modes and compressor saturated suction temperatures including a variable floating SST.

The options offered by City Multi VRF systems allow fixed evaporation set points ranging from -6 all the way to 14 degree Celsius. By floating the saturated suction temperature, the condensing unit can lift the evaporation temperature as the fan coil units reach their temperature set point. The result, increased occupant comfort levels and further improvement on the overall efficiency of the units when looking at seasonal performance data.

The YNW Range not only offers a larger range of single module condensers, but also an increased number of twinned condenser options.

YNW Range is the largest range of condensers available in today’s market, allowing combinations up to 140kW for heat recovery systems and up to 168kW for the heat pump range in both the standard and high efficiency options.

It is an energy efficient alternative system with flexible design!

The highly efficient E-Series Modular Chiller range, with an ESEER of 5.66, is designed to answer the need for controllable, energy efficient cooling and heating with reduced plant size and a host of advanced features and benefits taken straight from Mitsubishi Electric’s experience in the air conditioning industry.

The E-Series Modular Chiller is available in either a cooling only version or as a highly efficient heat pump model that uses two advanced DC inverter-driven scroll compressors in each 90kW module. Soft Start technology means that the starting current is only 8 Amps per module, where a conventional style chiller would pull up to 180 Amps on start-up, this reduces mechanical and electrical stress improving equipment longevity.

Whether one module or six, the deliverable capacity range is between 8% to 100%. The E-Series Modular Chiller delivers market-leading levels of efficiency with the ability for units to operate on their own or in conjunction with others.

Sophisticated Design and small footprint installation

The unique shape and modular design of the E-Series Modular Chiller means that the system can be constructed with up to six individual units connected together, to provide a total capacity between 90kW and 540kW. This also provides outstanding redundancy due to multiple refrigerant circuits.

The use of U-shaped high performance air heat exchangers offers a greater surface area, for higher heat exchange efficiency, this and the units are narrower than conventional systems. Each 90kW module can be positioned next to each other in a row, with up to six units using the same inbuilt, internal header. For larger systems, it is also possible to have double rows of the units with a gap of only 900mm service space plus it can be designed as a double-row double stack, offering space saving where plant area maybe limited.

And yes they are quiet too!

The E-Series Modular Chiller achieves low noise levels which is increasingly important in inner city locations. These low noise levels are achieved through both the unique construction and design of each unit, as well as the advanced component technology within each chiller.

The E-Series Modular Chiller is easily integrated with new and existing BMS systems, either hardwired or via MelcoBEMS mini interface it can be remotely controlled and monitored, ideal for facilities management.

CITY MULTI Newsletter - Issue 11

Friday 10th of November 2017
BDT welcome back the re-introduced City multi online newsletter. This newsletter will be emailed out on a regular basis updating you on new product ranges, functions and features specific to City multi and Applied Products and offer you a first-hand glimpse into some of the recently completed projects in the New Zealand Market.

Auckland University of Technology: NorthMed

Thursday 9th of November 2017
The NorthMed Clinic is a new building situated at Auckland University of Technology’s (AUT) North Shore Campus. This innovative facility which opened in July 2017, comprises of modern medical offices and teaching space for Physiotherapy, Psychotherapy, Podiatry, Oral Health, and Student Health Services.

HYBRID VRF - Industry First Patented Technology

Thursday 9th of November 2017
It is clear that designing building systems brings challenges. As we move to the future, inevitably there will be more regulations and legislation to adhere to, particularly around environment and occupant safety. BDT are no strangers to these challenges and we pride ourselves on providing solutions for the building market to comply, meet targets and provide outstanding quality systems for the end user.

BDT’s latest solution to the commercial building market is Hybrid VRF, the next generation of heat recovery systems for commercial buildings.

HVRF is a 2-pipe heat recovery system, the difference is refrigerant is replaced with water from the BC Controller to the indoor units. You can install and design it as VRF whilst enjoying the features of a chiller system.

Why is this a great solution?

The SGG levy in New Zealand has put extra cost on purchasing synthetic greenhouse gases and this cost is set to increase, pushing up the price of refrigerants such as R410A. HVRF reduces this burden as it has less refrigerant in the total system.

HVRF is ideal for applications where the limitation of refrigerant in occupied spaces is required, in particular where occupant safety is paramount. With no refrigerant in the occupied room space, this removes the need for expensive leak detection systems with ongoing maintenance costs.

HVRF is simple and flexible to design and install using the same control and network as VRF systems. Furthermore, the de-centralised system means phased installation is possible with the same high levels of seasonal efficiency expected with VRF. With water at the indoor units, HVRF provides comfortable and stable air temperature control enhancing occupant comfort.

Modular, small footprint and low weight outdoors makes for manageable phased installation. HVRF is a fully packaged solution; valves, pumps and heat exchangers are all contained within the HBC Controller with minor third party items required, making commissioning simpler.

Ideal Applications:

• Hotel
• Office
• Hospitals
• Mixed-use buildings
• Education

CITY MULTI Newsletter - Issue 10

Tuesday 1st of December 2015
Last month we introduced the extended Hybrid City Multi range now available in New Zealand, and discussed our first Hybrid VRF being installed into Rototuna Primary School in Hamilton. Enquiry rate is incredibly high for this product to the point that BDT has decided to stock a small quantity of Hybrid Branch Controllers, mid static ducted units, and cassettes. Outdoors are already being held as we utilise a common outdoor for both the VRF and HVRF products.

Quality Installation - Downer Building

Tuesday 1st of December 2015
The Downer Head Office building is a two stage project nearing completion, and has challenged the Consultant to come up with an air conditioning solution for a variety of different spaces throughout the building.

Downer Stage II

Main Mechanical Contractor - Heatwave Mechanical Services
Sub-Contractor - Carson Electrical

The second stage of Downer’s head office building will soon be completed and will double the office space available to Downer staff in Wiri, Auckland.

The contractor has demonstrated a high level of expertise in this quality installation, carrying on our theme of showcasing the very best workmanship on VRF projects nationwide. Cleary the refrigerant piping route has been carefully thought out and the use of “Saddle-Up Pipe Insulation Saddles” from Refspecs makes for a tidy and practical bracketing option. Not only do these saddles look sharp but there is no need to cut and glue insulation on either side of the traditional pipe brackets meaning reduced labour costs.

The high quality level of workmanship carries on throughout this project with the installation of mainly ducted and one way cassette type indoor units for a clever use of the limited outdoor unit space.

With the level of planning and care taken throughout the project it was no surprise that BDT commissioning was carried out without significant problem and in record time.

Downer Building Case Study

Located in Wiri, Auckland, the Downer Head Office building was completed in two stages – with Stage 1 commencing in 2011, and Stage 2 currently nearing completion.

Find out more

Lossnay RVX range

Tuesday 1st of December 2015
Fresh air ventilation and indoor air quality have become more important than ever, and with this comes the need for high energy efficiency, maximum heat recovery potential and integration options with air quality monitoring systems. These requirements have been the driving force in the production of the Lossnay RVX range.

Lossnay’s total heat exchange ventilation systems utilise a permeable core to maximize the heat recovery potential offering both sensible and latent heat exchange, as well as offering higher energy transfer than solid core heat exchangers.

The RVX range offers increased efficiency and optimises control and integration options compared to previous models:

• Increased energy savings by the adoption of high efficiency DC fan motors
  
  *Comparison between Fan speed 4 of RVX and Extra-High of RX5
• Improved air volume range. The RXV is equipped with 4 primary fan speed settings -
  25,50,75, and 100%, allowing much finer air volume control.
  
• Increased Air volume control by CO² Sensor -
  Staging the 4 fan speeds based on a 0-10Vdc signal from a third party CO² sensor, the RVX Lossnay offers simple integration to ensure optimal fresh air volumes are provided based on the CO² level incurred due to occupancy levels .This has the added benefit of reducing the fresh air load on the heating systems during periods of low occupancy.

New modern look backlit LCD Lossnay wall controller

CITY MULTI Newsletter - Issue 9

Wednesday 9th of September 2015
In the last issue of the City Multi Newsletter we introduced the Quality Installation section to showcase the high standard of quality installation that was applied to our 2 pipe heat recovery VRF systems by AMT Mechanical. We had an incredible amount of feedback from various contractors nationwide agreeing with us that this was an incredible standard of workmanship. This month’s quality installation has been witnessed at OPUS House Christchurch by Beattie Air.

Quality Installation - OPUS House in Christchurch

Wednesday 9th of September 2015
OPUS House Christchurch will soon be completed and will become the new offices for OPUS Consultants in Moorhouse Ave. This is a 5 story building that has been designed and built by Beattie Air utilising City Multi R2 Series air conditioning, and Lossnay heat recovery ventilators to maximise the buildings mechanical services efficiency.

Another example of high quality installation, (following on in the theme in our last City Multi Newsletter) is demonstrated by Beattie Air in an incredibly tidy install at OPUS House. Beattie Air is one of few companies nationwide that install refrigeration ball valves on every single BC port as standard practise. This gives them the ability to make a fit out change, or maintain indoor units without having to shut the system down, and re-pressure test and evacuate the entire system. A small additional cost up front can save days of downtime at a later date.

(BC controller piping to the indoor comes with refrigeration ball valves).

When installing the main pipework between the outdoor unit and the branch controller, Beattie Air installers colour code their pipework with electrical tape once it is insulated. This is due to our PURY-P550, 500, and 650YLM-A outdoor units all sharing common size high and low pressure pipe sizes.

(Colour coded pipe work so the installers can identify the high and low pressure pipes)

We are incredibly pleased to see that Beattie Air has contributed to our quality installation section within our newsletter. Good Job!

Hybrid City Multi

Wednesday 9th of September 2015
Hybrid VRF (HVRF) is the latest advancement in City Multi product that has been uniquely developed by Mitsubishi Electric, as a permanent solution to critical concentration levels of refrigerant in confined spaces. By utilising HVRF over traditional VRF / VRV systems, you no longer need to install refrigerant monitoring devices and have these maintained on a yearly basis, or install additional or oversized supply or exhaust air fans within the space.

FEATURES AND BENEFITS

• No refrigerant anywhere near the occupied spaces
• Milder air off conditions compared with VRF
• Faster defrosts; as it utilises the water within the loop to defrost
• Faster return to heating mode after defrosting; as there is still sufficient heat in the water loop.
• Faster installation due to segregation between refrigerant and water sides allowing independent pressure testing, and evacuation on the refrigerant side.
• No refrigerant noise at the indoors as the water is isolated by the flow control valve during thermos-off and when the unit is switched off.
• Utilising the same system architecture as our VRF City Multi, this still gives the flexibility of spare ports and for the contractor to fit isolation ball valves for future connections / maintenance to avoid completely shutting the system down.

EXPANDED HVRF RANGE

Hybrid City Multi now utilises the common R2 series outdoors of our standard VRF range:
- PURY-P YLM-A - Standard COP range
- PURY-EP YLM-A - High COP range c/w flat tube aluminium fin and tube heat exchangers

The outdoors used for Hybrid City Multi installations are now available in 7 sizes ranging from nominal cooling 22.4kW >> 56kW and PURY-EP200 >> EP500YLM-A

Japan has also confirmed that their intentions are to develop this outdoor range overtime right up the PURY-P900YLM-A series. BS coating can also be applied during factory assembly to offer additional protection where outdoors are within close proximity to the sea.

Hybrid Branch Controllers are now available in two sizes – an 8 port and a 16 port. Slave BC controllers have now also been added to the range also in 8 and 16 port arrangements. This gives you the flexibility to have up to 2 x master and 2 x slave HBC’s per outdoor system giving even greater installation flexibility up to a maximum of 50 indoor units per outdoor.

The Hybrid indoor range now has 3 sizes of cassettes available. We are constantly asked when the mid static duct range will be expanded, and when a hi-wall option will be developed. Both of these requests are currently in development and we hope to make these available to you very soon.

Hybrid City Multi is an incredible product and is priced very competitively against our standard VRF system. We look forward to providing you with updates on the first system sold into a Hamilton primary school.

Find out more

Aspire Health and Sports

Wednesday 9th of September 2015
Aspire Health and Sports a brand new two story multi-purpose gym/health centre challenges the City Multi team to provide an efficient air conditioning solution to a range of different spaces each with their own unique requirements located within the complex

CITY MULTI Newsletter - Issue 8

Friday 5th of June 2015
The last edition of the City Multi newsletter show cased our LOSSNAY heat recovery ventilators, which we have been successfully selling into multiple applications nationwide. This provides a perfect introduction into Mitsubishi Electric’s range of outdoor air processing units, the GUF series that we are showcasing in this edition.

Quality Installation - Cashel Square in Christchurch

Friday 5th of June 2015
This month’s quality installation is from Cashel Square in Christchurch, where AMT have taken great pride in installing over 950kW of heat recovery City Multi product (R2 series).

The installation is immaculate, showcasing some of the tidiest branch controller (BC) pipe work that BDT staff have witnessed. AMT installers have taken the time to label all BC’s with BECA consultants AC reference, pipe sizes, and length of pipe to the indoor unit. All refrigerant pipes are also labelled every few meters with the port number. This makes calculating additional refrigerant charges and commissioning these systems an absolute breeze.

(Perfectly installed BC controller with AC reference, pipe size, and pipe lengths to the indoor)

All the pipe work is well supported and carefully laid out on cable trays before heading down its own path towards the indoor unit.

(All main runs of refrigerant pipework from the BC are supported on cable tray)

This is an impressive standard of installation that has become the norm for AMT installers that we now witness across all of their sites. In our opinion, it’s a shame that this will soon be hidden by a suspended ceiling, but it will certainly make any future fit out changes very simple to complete.

GUF-RD4 – Outdoor Air Processing Units

Friday 5th of June 2015
The Mitsubishi Electric GUF-RD4 Outdoor Air Processing Units can be used with any of the extensive range of City Multi indoor units to provide ventilation, dust removal and heat recovery for a total air conditioning package with remarkable power.