Cassette AC installation for a restaurant, Orsman Road

The project at a glance

Climate Flow Limited installed two Mitsubishi Heavy Industries cassette air conditioning systems at a restaurant on Orsman Road, London. Each system pairs a ceiling cassette indoor unit with its own outdoor condensing unit, condensate drain pump, refrigerant pipework and wiring. The whole installation was finished in under two days. Climate Flow installs and services commercial and residential air conditioning across London and surrounding areas.

A cassette unit is an indoor air conditioning unit set into the ceiling, so only its grille shows in the room. A condensing unit is the outdoor unit that rejects the heat the indoor unit takes out of the room.

What did the restaurant need?

The restaurant wanted cooling that kept customers and staff comfortable and kept a clean, professional look in the dining space.

What was installed?

• Two Mitsubishi Heavy Industries ceiling cassette indoor units
• Two Mitsubishi Heavy Industries outdoor condensing units
• Two condensate drain pumps
• Insulated refrigerant pipework
• Electrical interconnecting cables
• A condensate drainage system

A condensate drain pump is a small pump that lifts the water an air conditioning unit collects while cooling and moves it to a drain.

What did the work involve?

1. Core drilling. Holes were core drilled through the reinforced concrete walls and ceilings for the pipework and cables.
2. Suspension. Steel channels and threaded rods were fixed to hang both cassette units securely from the concrete.
3. Pipework. Insulated refrigerant pipework, sized 1/4 inch and 5/8 inch, was run between each indoor unit and its condensing unit.
4. Drainage. Condensate drainage and overflow pipework went in, with a drain pump for each cassette.
5. Testing and commissioning. Both systems were pressure tested, evacuated under deep vacuum and commissioned, then run and checked for performance. Deep vacuum evacuation means pumping the air and moisture out of the refrigerant pipework before the system is charged. Commissioning means starting the system and setting it up to run as designed.

Work on air conditioning that contains F gas is controlled by law. GOV.UK states that it is against the law to work with F gas without the correct qualifications, and that a company installing, repairing, maintaining or decommissioning this equipment for others must itself be certified. Climate Flow is F-Gas certified.

What changed during the job?

After work had started, the restaurant asked to move the indoor units and change the route of the refrigerant pipework.

The building itself added work. Reinforced concrete needs specialist core drilling equipment, and the cassettes needed heavy-duty suspension fixings.

How did the job finish?

• The complete installation was finished in under two days.
• Each cassette has a dedicated drain pump to remove its condensate.
• Both systems were commissioned and checked before handover.

More air conditioning projects

For other commercial air conditioning work, see the Mitsubishi Electric split system installed in a retail unit in Hillingdon and the VRF air conditioning maintenance at Energie Fitness Gym. Every published job is on Our Projects.

This guide is general information, not a survey or a quote for your site; every system is different, so an engineer needs to see yours before any work is priced.

Climate Flow Limited works across London and surrounding areas. To talk about cassette air conditioning for your own restaurant or premises, call 020 3488 5452 or request a quote through the contact page.