Manchester Air Conditioning+ has recently carried out a professional wall mounted air conditioning installation project at a hotel in Manchester.
The previous company was not capable of effectively servicing the air conditioning systems as they were an installation focused company. The customer was unaware of this for some time until there were a lot of issues with the air conditioning systems.
The philosophy of the old company was to replace the unit saying the immortal line “for the price of the repair, you may as well replace the unit”. That is a line this type of company use a lot for one to one split air conditioning systems. It was difficult for the previous company to keep saying that because most of the units are part of a VRF.
There are no issues now as Manchester Air Conditioning+ has the capability to maintain all of these systems and also megawatt chilled water systems by Maximus Chillers Ltd.
Wall Mounted Air Conditioning Installation Manchester System Types
The systems at this hotel are a mixture of different types, these are:
• Mitsubishi Electric VRF (variable refrigerant flow) These are 3 pipe systems that are installed which can simultaneously be set to heat or cool the rooms. The BC controller (Branch Circuit) diverts the refrigerant in its discharge vapour phase for heating and subcooled liquid phase for cooling. A rack of solenoid valves diverts the refrigerant to the Indoor units. These units work as a condenser with the discharge refrigerant (heating) or a evaporator/ expansion valve with the subcooled liquid (cooling)
• Daikin VRV (variable refrigerant volume) this is the same technology as the above system, but they have individual branch boxes with 3 pipes going in and 2 pipes coming out.
• Twin splits are fitted to some of the larger rooms with one controller on the wall.
• One to one splits are installed in some of the smaller rooms and the computer server room for the hotel internet system.
0161 237 3727
service@maximuschillers.com
Decommissioning of Wall Mounted Air Conditioning Installation Manchester
The systems that had been decommissioned by the previous company had been disabled with parts removed ready for replacement. The refrigerant that had been in the systems had been decanted and returned to the suppliers. The oil had been drained from the compressors.
Site Survey
This was always going to be a difficult project because the hotel has guests and the rooms are occupied. Our lead engineer arranged a time to liaise with the customer on site. There is a main air conditioning compound on the roof of the 5 storey hotel. This is where most of the Outdoor units are located. We identified the units that need replacement and matched them up with the corresponding Indoor units.
Unit Chart
This was possible as a unit chart had previously been made by the onsite maintenance team. Before the rooms were occupied, each Outdoor unit was switched off, one at a time, to see which Indoor units went into fault. This was a tremendous help as the rooms were now occupied and installation teams are known to label units up incorrectly.
Quotations for Wall Mounted Air Conditioning Installation Manchester
Our lead engineer then returned to our Office in Dale Street, Manchester. A separate quotation was submitted for each of the units with the Terms to pay for the plant before delivery. The installation Invoice being submitted and paid before moving on the the next installation. This is just a procedure that we have to adhere to from Head Office of Maximus Chillers Ltd.
0161 237 3727
service@maximuschillers.com
Installation Case Study
Here is a case study of one of the installations being carried out in the server room:
Standby A/C Unit
A portable air conditioning unit was available on site which the customer has used in the past when there have been system failures. This unit was positioned in the server room with the condenser exhaust being positioned through the door.
Electrical Isolation of Wall Mounted Air Conditioning Installation Manchester
The electrical wires were tested to be ‘dead’ and then disconnected from the Indoor and Outdoor units. The same wiring was re-used with new isolators fitted.
Unit Removal
The refrigerant had already been decanted and the oil drained from the compressor by the previous company. Therefore, the removal of both units was straight forward. The units were then stripped down into recyclable metal and plastic. The PCBs are recycled separately.
Fitting New Units
The Outdoor unit was lifted into place and fixed onto the concrete slabs in the A/C compound on the roof. The Indoor unit was lifted onto a mounting plate in the server room and checked to be level.
Flared Connections
New flared connections were made for the pipework and the flare nuts were tightened into place.
Pressure Test for Wall Mounted Air Conditioning Installation Manchester
A pressure test was carried out of the pipework according to standard industry guidelines which was witnessed by the customer and recorded on the paperwork.
Dehydration Process
Any moisture in the system was removed by dropping the pressure down to 2 Torr using a vacuum pump. Due to the higher pressure in the system, the freezing point of water increases correspondingly. This means that ice could form behind the expansion valve on a poorly dehydrated system.
Commissioning of Wall Mounted Air Conditioning Installation Manchester
The refrigerant was released around the system and the A/C unit was started up. The hard wired controller has a service option to read the various sensors around the system. These were all found to be nominal along with the refrigerant pressures on the Outdoor unit suction and low pressure liquid pipes. The superheat value was worked our using our test equipment and a slide chart. This was to ensure there was no refrigerant slug back the compressor.
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