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CITY MULTI for MEC2 Headquarters

Mechanical Engineering & Construction Company (MEC2) based out of Catonsville, Maryland, is an engineering and construction firm that serves as a mechanical HVAC contractor on many commercial, institutional and government projects in the DMV. In 2014, after 11 years in their offices, leadership decided it was time to find a new headquarters, complete with the mechanical systems of their choice. After purchasing a vacant 7-Up bottling distribution plant, with 15,000-square-feet of office space and a sports facility, MEC2 specified, designed and installed a new HVAC system. Their choice: CITY MULTI from Mitsubishi Electric. Below, you’ll hear from the company’s director of engineering on why Mitsubishi Electric VRF was the right fit for their facility.

Why did you want VRF for your offices? Were you going for a green certification?

As mechanical contractors and engineers, we understand that energy savings are paramount but we didn’t really need a green building certification in this case to know that we were developing an energy-efficient facility. In choosing an HVAC system, we were most concerned with energy efficiency, the flexibility of the system, our team’s familiarity with the product and the support from the local distributor. Aireco APG is our rep.

Why was Mitsubishi Electric VRF favored for this job?

We actually looked into using Mitsubishi Electric VRF before we took ownership of the new property. We specify CITY MULTI on many of our VRF projects and know it’s a quality product – we wouldn’t have considered it if it wasn’t. We wanted the flexibility and quality that the system provides and the simultaneous heating and cooling.

What equipment was specified for the building?

We used the air-source heat recovery system for the offices. Everything is ducted and we installed a Lossnay® Energy Recovery Ventilator (ERV) to bring in fresh air. All systems we have in the building are integrated and tied into one controls system. It’s worked out great and we haven’t had any issues. With proper maintenance and filter changes, the equipment really lasts.

How did APG provide support?

All the people at APG have been great to work with, informative and their response time is great. Honestly, the quality of the product and the proper support we receive through them are the two big factors why we use Mitsubishi Electric VRF. APG is not just a distributor; they’re not just a sales team. APG has technically-savvy people in the field who can speak to the controls and the units themselves. Plus, they always have the product in stock.

METUS Equipment Installed for MEC2:

  • (1) R2-Series Heat Recovery Outdoor Unit
  • (4) PEFY-P18NMAU-E2 Ceiling-Concealed Ducted Indoor Units
  • (3) PEFY-P12NMAU-E2 Ceiling-Concealed Ducted Indoor Units
  • (2) PEFY-P24NMAU-E2 Ceiling-Concealed Ducted Indoor Units
  • (1) PLFY-P18NBMU-E Four-Way Ceiling Cassette
  • (2) Lossnay® Energy Recovery Ventilators
  • (1) MSZ-GE09NA Wall-Mounted Indoor Unit
  • (1) AE-200 Centralized Controller
  • (10) Simple MA Controllers

Ventilation and Building Automation Products from Mitsubishi Electric

Mitsubishi Electric Cooling & Heating is known for its high-performance Variable Refrigerant Flow (VRF) systems, but they also provide top-of-the-line ventilation equipment and controls as well. At Advanced Products Group (APG), we have hands-on experience specifying and designing with these products in mind and can speak to their effectiveness and superior performance.

Lossnay® Energy Recovery Ventilators (ERV)

ERVs recover energy from stale exhaust air to preheat or precool incoming outside air. This is an energy-efficient way to precondition fresh air as it enters a building and reduce its impact on heating and cooling loads. The Lossnay ERV uses a cross-flow energy exchange core to prevent inbound air and exhaust air from mixing while crossing airflows.

  • Fully compatible with the Mitsubishi Electric AE-200A, AE-50A, and EW-50A Centralized Controllers
  • Compliant with LonWorks® and BACnet® interfaces
  • Additional dampers and adapters are not needed. Automatic mode allows the system to select recovery or bypass as required
  • Multi-functional LCD Remote Controller has a streamlined interface and can easily control Lossnay modes, fan speed and interlock operations.

PremiSys® Dedicated Outdoor Air Systems (DOAS) Family

PremiSys and PremiSys Fusion are premier solutions for conditioning outside air for commercial buildings. Designed to handle 100% of outdoor air with optional energy recovery, these systems offer premium features ideal for handling ventilation air in VRF applications.

  • A factory-mounted variable frequency drive (VFD) for supply air volume control and an onboard microprocessor system allow for better temperature and humidity control
  • Pre-engineered features provide semi-custom flexibility while maintaining the quality, consistency and value of the product
  • PremiSys systems allow you to take advantage of a split-system design and improve application flexibility
  • Multiple filter options available including MERV 8, 13 or a combination MERV 8/13

Diamond Controls™ Solutions

Diamond Controls is designed to streamline facility management and provides unprecedented levels of control over individual buildings and multiple buildings, whether located on a single site or across multiple locations. With VRF systems being specified in both new construction and retrofit projects, it’s likely you’ll need a building automation system that can handle all types of equipment. With Diamond Controls, you can integrate multiple mechanical systems, regardless of manufacturer, into a single interface.

  • Optimize efficiency through scheduling to maximize a building’s performance and minimize energy usage
  • With remote access and control, facility monitoring is remarkably simple. Use a laptop or tablet to manage comfort from anywhere
  • Diamond Controls software is secure, customizable, upgradable and scalable for your project’s needs. Advanced authentication ensures safety
  • New Diamond Controls Advanced Integration Panels offer custom application solutions within a pre-engineered panel

For more information on any of these building solutions, visit

VRF for Bon Secours’ Marian Hall

Officially established in the U.S. in 1881, Bon Secours Retreat and Conference Center, of Marriottsville, Maryland, is a ministry of the Sisters of Bon Secours (Bon Secours). Since 1824, when Bon Secours was founded in Paris, the Sisters have helped those in need and offered compassionate care to their community.

Guests of the sprawling center which sits on 313 acres of land, visit for spiritual direction, retreats with their church or organization, writing or personal reflection. The main building has a variety of conference spaces and meeting rooms as well as 70 individual overnight rooms. In 2015, APG retrofitted the conference center with CITY MULTI® VRF technology from Mitsubishi Electric Cooling & Heating. Bon Secours was so impressed that for its next endeavor, Marian Hall (a retirement and assisted living center for the Sisters), CITY MULTI was their first choice, with Fidelity Mechanical Services serving as the installing contractor.

What is the purpose of the Marian Hall building and what requirements did Bon Secours have?

The Marian Hall project is a retrofit of an existing space. The idea is that the Sisters want to take care of each other into their older years. The building has a healthcare area, common areas, standard living space, an industrial kitchen and amenities like a hair salon. It’s a self-contained community with both independent and assisted living portions.

As for their requirements, they wanted supreme comfort for the residents, individual zone control and the ability for Marian Hall’s HVAC system to tie in to the front end controls part of the conference center. Comfort and easy operations were critical to this project.

Why was Mitsubishi Electric VRF favored for this job?

There are several reasons why Mitsubishi Electric stood out. When Bon Secours was doing the initial renovation back in 2015, they actually looked at other third-party brands such as Daikin. Ultimately, the two-pipe design and comprehensive support made them choose Mitsubishi Electric. They had been very happy with the Diamond Controls Solutions platform, VRF performance and support they received from us at APG and Mitsubishi Electric. Doug Pine and Dan Wineke of Mitsubishi Electric were both central to that job. Honestly, we’ve been told the building engineer didn’t even consider any other brands for Marian Hall.

In addition, rebates were also a big component for their system selection. The Sisters wanted economical operating costs and to maximize their rebate with the local utility provider, Baltimore Gas and Electric Company (BG&E). In this scenario, the total rebate is based on the pressure taken off of the electric grid. The more energy-efficient systems installed, the more the dollar amount goes up. I’ve been told Bon Secours received a six-figure rebate for this project.

For such a diverse space, what ventilation equipment was selected?

Marian Hall has a PremiSys DOAS unit to bring in lots of fresh, outside air. There’s a minimum standard ventilation code required by the state. That said, Bon Secours really loved that the DOAS communicates directly with the VRF equipment and integrates within the Diamond Controls platform. With so many different areas in Marian Hall (there’s 28 cooling and heating zones), the precise control of each system was a big selling point.

METUS Equipment Installed for Marian Hall:

  • (2) H2i® R2-Series Heat Recovery Outdoor Units
  • (7) PLFY Four-Way Ceiling Cassettes
  • (1) PMFY One-Way Ceiling Cassette
  • (19) PFFY Floor-Mounted Indoor Units
  • (24) Simple MA Remote Controllers
  • (1) AE-200A Centralized Controller

(1) PremiSys DOAS Rooftop Unit

New Light Commercial Products from Mitsubishi Electric

Get ready for some exciting, new light commercial products from Mitsubishi Electric Cooling & Heating! At Aireco Advanced Products Group (APG) we are proud to offer our customers the best in energy-efficient HVAC innovations for all types of applications.

SLZ-KF Four-Way Ceiling Cassette

The newest member of the M-Series, the SLZ-KF brings comfort to any light commercial application. With four-way vane control, occupants can select two-, three- or four-way airflow patterns. Each vane can also be adjusted individually. The optional 3D i-see Sensor®, which calculates the room occupancy rate, adjusts conditioning accordingly with direct or indirect airflow settings, offering 72 different combinations for comfort. The result is improved energy savings with a SEER rating over 19.8 and even temperature distribution. With the introduction of a 3D-turbo fan, the SLZ-KF’s sound level is supremely quiet, as low as 25 dB(A). In addition, the unit includes easy-to-clean, washable, 10-year filters with multi-stage allergen filtration.

Mechanical contractors will also be pleased to learn of the unit’s streamlined redesign compared to previous models. The temporary hanging hooks, captive screws and larger wrench-turning radius on piping make installing the unit overhead much easier.

MSZ/MUZ-JP Model 115 Volt Heat Pumps

Part of the M-Series product lineup, each 115 Volt Heat Pump system utilizes one breaker spot in an electrical panel versus the typical two breaker spots. A single-zone system, the MSZ-JP model indoor unit and corresponding MUZ-JP model outdoor unit are ideal for light commercial applications, such as hotels and restaurants. Available in 9 and 12 kBtu/h capacities, the system has a seasonal energy efficiency ratio (SEER) of 17.0, a heating season performance factor (HSPF) of 9.3-11.00 and an energy efficiency ratio (EER) of 9.9-12.0.

Additional Features

  • Quiet operation: as low as 22 dB(A) for the indoor unit
  • Low ambient heating down to – 4 degrees Fahrenheit
  • Wireless enabled (optional feature) with the ability to pair with kumo cloud® software and other thermostats when using the Thermostat Interface
  • Washable air filters and anti-allergy enzyme filter mechanisms
  • ECONO COOL mode delivers air at higher set point but in a swing motion, which is an energy-efficient way to make occupants feel cooler
  • 12-hour timer which allows for one ON/OFF cycle during a 12-hour period

CITY MULTI® for Grow Facilities

The legal marijuana market is expected to be worth $146.4 billion USD by 2025 and grow facilities are in high demand. With a multitude of medical uses and applications, companies like MariMed Advisors, a marijuana business consultant, are on the rise, helping growers legally design, develop and operate medical cannabis cultivation centers and dispensaries.

One of their latest developments is Kind Therapeutics USA, a grow facility located in Hagerstown, Maryland. While the building has diverse humidity and zoning requirements, mechanical contractor CARE Services Inc., based out of Williamsport, Maryland, knew CITY MULTI Variable Refrigerant Flow (VRF) from Mitsubishi Electric was a complementary system for the project. Below, the mechanical contractor explains why they specified CITY MULTI and the support they received from APG.

Why was Mitsubishi Electric VRF specified? 

From a system standpoint, we needed versatility. It’s a 130,000-square-foot, three-story building with two floors used for growing. We could not use ductwork and CITY MULTI VRF was an ideal system. We used a mix of the ceiling-concealed units and the wall-mounted indoor units.

The original plans actually called for a third-party VRF system. That brand had an equipment ship time of six to eight weeks and at the last minute, the first mechanical contractor could no longer work on the job. When MariMed Advisors called us for support, I immediately contacted Michael Stewart and Brian Maddrey from APG. We planned out the equipment and they put together a submittal package for me. Based on the success of other CITY MULTI projects we had done together, I suggested Mitsubishi Electric VRF to Kind Therapeutics. With equipment stocked at the Atlanta headquarters, we were able to get the product in a matter of days.

How was Mitsubishi Electric VRF favorable for this type of application? 

Certain strands of marijuana require specific amounts of humidity; certain strands require different temperatures. With VRF’s individual temperature settings, every area can have its own designated climate and comfort level. The zoning capabilities have been very beneficial in this application. In fact, we even installed Mitsubishi Electric units in areas that were not initially designed to be a part of the grow facility – like storage rooms. They’ve turned these different areas into part of the growing application and Kind Therapeutics has had even greater yields.

Ultimately, what equipment was installed?

We installed 88 indoor units and six condensing units in 2017. The building was fully operational in 2018 but they started growing the plants in 2017. As for controls, Kind Therapeutics has the AE-200A Centralized Controller and the Simple MAs for various rooms. A third-party ERV provides fresh air to the non-grow areas of the facility. Everything has been working great and the staff are happy with the individual controls and temperature settings.

How does APG provide technical support?

I may sound biased, but CARE Services is a Diamond Contractor® and we have been working with Mitsubishi Electric HVAC equipment since 2006. That said, the biggest benefit for me working on a CITY MULTI application happens to be their distributor, APG. The support I get from Tim Kemp, Matt Kemp, Brian and Mike is unparalleled. If I have a question, a problem, a concern, I get an answer. For instance, during the construction phase, I called up Brian to do a walk through, just to make sure we had another set of eyes on the project and he was there.

Every project I’ve ever done with APG, they’ve always had my back, no matter what.

METUS Equipment Installed:

  • (6) R2-Series Heat Recovery Outdoor Units
  • (42) PKFY Wall-Mounted Indoors Units
  • (46) PLFY Four-Way Ceiling Cassettes
  • (69) Simple MA Remote Controllers
  • (1) AE-200A Centralized Controller