air conditioning inspection reportproperty.shw.co.uk/documents/brighton, 48-50 western road,...

Air Conditioning Inspection Report

RRN: 0990-2970-0542-0320-9090 of 23

Site DetailsSite Address(where inspection was carried out)

48-50 Western Road, BRIGHTON, BN1 2EB

City BRIGHTON Postcode BN1 2EB RRN 0990-2970-0542-0320-9090 Related RRN 9209-6029-0724-0900-3091

Report InformationInspection Date 2012-01-17 Issue Date 2012-04-16 UPRN 294709200000

Assessor DetailsAssessor Name Alex Reynolds Assessor ID STRO005803

Employer/Trading Name Energy Team (UK) Limited

Employer/Trading Address Team House, Unit 7 Braybon Business Park, Consort Way, Burgess Hill, West Sussex. RH15 9ND

Accreditation Scheme Name Stroma


RRN: 0990-2970-0542-0320-9090 of 23

Executive SummaryThis report has been prepared in accordance with Part 4 of the Energy Performance of Buildings (Certificates and Inspections) (England and Wales) Regulations 2007, which implementsArticle 9 of the Energy Performance of Buildings Directive. The inspection has been carried out by an Accredited Air Conditioning Assessor using the Department for Communities and LocalGovernment approved inspection and reporting methodology

This building is located on a busy shopping high street in central Brighton. Air conditioning is used to provide both heating in winter and cooling in the summer.

In accordance with CIBSE TM44 guidance this report is based on a random sample of air conditioning systems. This amounts to a minimum of three systems or 10% of the total for single ormulti split systems.The air conditioning comprises two Daikin ceiling mounted single split systems only totalling 25 kW cooling capacity, both of which were inspected during this visit.

The general condition of the air conditioning system was good and no major operational issues were discovered. A number of opportunities are outlined within the report that should beimplemented to maximise efficiency. While there is no requirement to carry out any recommendations, acting upon the advice within the report will lead to a reduction in energy consumption andoperating costs.

INSPECTION FINDINGS

1. Although the split system controllers can be used to set daily on/off schedules, the capability is not being fully used. Instead, staff turn the equipment on or off when required. This can be anextremely wasteful way of operating the equipment especially if staff fail to switch off equipment when not required i.e. overnight.

2. We would recommend considering the installation of separate controllers for each system. At present one controller operates all of the systems. This will enable greater control over thetemperature at the front and rear of the shop, which can often vary significantly as a result of the external air entering through the customer entrance, particularly during winter months. Thiswill inevitably result in energy savings as the units towards the rear of the shop can be turned down or even off whilst the front unit provides heating. Speaking to staff during the inspection itbecame apparent that during winter months the air conditioning may conflict with the front door warm air curtain causing the store to overheat.


RRN: 0990-2970-0542-0320-9090 of 23

Key Recommendations:

Advice and comments on the efficiencies of the AC sub system(s)

The systems installed both incorporate inverter driven compressors that are very efficient if kept well maintained and managed effectively. However the time controls currently built withinthe air-conditioning units are not being utilised effectively. Setting the systems up on a timer with the correct time and dates will allow occupants to control when the system is on, and moreimportantly when the system is turned off. Most people feel comfortable in a temperature range of between 18 to 26 degrees Celsius, provided the temperature is in line with outdoor conditions.It is common sense that staff and visitors will be dressed for the weather conditions, so when it is hot outside, they will be wearing cooler clothing. Make sure this is factored in when settingair conditioning. Observe staff behaviour, if people are bringing in warmer clothing to wear whilst working, this may be a sign that the air conditioning is set too low. Set internal temperaturesappropriately and encourage staff to dress in a way that suits the setting. If uniforms are provided, make sure they are suitable for their purpose, considering extreme temperatures if necessary.If possible, also ensure workspaces are shielded from draughts and direct sunlight to help improve the comfort of the entire work area. These are no-cost solutions that save money and helpmaintain comfort.

Advice and comments on the maintenance of the AC sub system(s)

It is pleasing to note that a system of planned maintenance is in place for the air conditioning and no major operational issues were identified.

Advice and comments on the control of AC sub system(s)

Air conditioning is used at this store as and when required rather than making use of automated controls. Generally therefore, it is on throughout the winter during opening hours and on insummer dependant upon the weather. Making use of the cooling system controller capabilities with respect to time profile programmers can help prevent out of hours operation and excessiveenergy consumption. Consider also restricting summer set point temperatures to 24 degrees celsius. This is an acceptable temperature in accordance with CIBSE and Carbon Trust guidanc thatwill help to reduce energy consumption.

Advice and comments on the management of AC sub system(s)

Is the use of the air conditioning system necessary? Is there the option of taking advantage of the use of natural ventilation or the implementation of a simple extract system to minimise the useof air conditioning. Reduction of heat gains from lights and solar gains from the sun (where applicable) will also reduce the use of air conditioning systems. Before installing cooling equipment,always identify where the excess heat is coming from. Sunlight, equipment, lighting and refrigeration are often main causes. As a general rule, the more energy efficient equipment is, the lessheat it produces. So installing low-energy lighting and keeping equipment operating at peak efficiency reduces cooling costs. Sub metering plant and/or zones within the building is not currentlybeing done. A 'Monitoring and Targeting' strategy should be adopted. Such strategies can help identify where energy is being wasted and help set/monitor targets to reduce consumption.Compile a Building log book as per the CIBSE Building Log Book Toolkit TM31. The log book should contain details of the building services and maintenance requirements; areas servedand recommended settings etc. As a minimum the log book should contain essential information about the refrigeration equipment as set out in this report. Keep a running log of occupantcomplaints, noting the day, time, location, system concerned and the remedial works carried out. Fully investigate the causes of occupants complaints as they can highlight areas where systemsare under performing. Any energy saving effort will benefit from the commitment of everyone within the workplace. It is therefore good practice to educate your staff regarding any initiative, andideally motivate everyone to get involved. You could even incentivise their efforts in some way. Making energy awareness part of the organisational culture not only has benefits for the levels ofenergy consumption and cost reductions, but is also a great way to increase a sense of team spirit through shared values and goals.


RRN: 0990-2970-0542-0320-9090 of 23

Sub System IndexVolume Definitions VOL020

Sub System ID SYS001

Sub System Description Ceiling mounted single split system

Effective Rated Cooling Output of Sub System(kW)

12

Sub System Area Served Shop floor

Inspection Date 2012-01-17

Cooling Plant Count 1

AHU Count 0

Terminal Units Count 0

Sub System Controls Count 1


RRN: 0990-2970-0542-0320-9090 of 23

Sub System IndexVolume Definitions VOL020

Sub System ID SYS002

Sub System Description Ceiling mounted single split system

Effective Rated Cooling Output of Sub System(kW)

12

Sub System Area Served Shop floor

Inspection Date 2012-01-17

Cooling Plant Count 1

AHU Count 0

Terminal Units Count 0

Sub System Controls Count 1


RRN: 0990-2970-0542-0320-9090 of 23

Note: Request the following information from client and complete the following checklist. The assessor should examine the relevant documentation and systems as far as possible to checkthat the installed equipment is as described. If the documentation is not available, then an additional part of this procedure is to locate the equipment and assemble a portfolio of relevantdocumentation which should include all ‘Essential’ items as a minimum.

Record Checklist Pre Inspection InformationLevel Information Required Reviewed Not Available

Itemised list of installed air conditioning and refrigeration plant including product makes, models andidentification numbers.

[x] [ ]

Cooling capacities, with locations of the indoor and outdoor components of each plant. [ ] [x]

Description of system control zones, with schematic drawings. [ ] [x]

Description of method of control of temperature. [ ] [x]

Description of method of control of periods of operation. [ ] [x]

Essential

Floor plans and schematics of air conditioning systems. [ ] [x]

Reports from earlier inspections of air conditioning systems, and for the generation of an energyperformance certificate.

[ ] [x]

Records of maintenance operations carried out on refrigeration systems, including cleaning indoor andoutdoor heat exchangers, refrigerant leakage tests, repairs to refrigeration components replenishing withrefrigerant.

[ ] [x]

Records of maintenance operations carried out on air delivery systems, including filter cleaning andchanging, and cleaning of heat exchangers.

[ ] [x]

Records of calibration and maintenance operations carried out on control systems and sensors, or BMSsystems and sensors.

[ ] [x]

Records of sub-metered air conditioning plant use or energy consumption. [ ] [x]

Desirable

For relevant air supply and extract systems, commissioning results of measured absorbed power at normalair delivery and extract rates, and commissioning results for normal delivered delivery and extract air flowrates (or independently calculated specific fan power for the systems).

[ ] [x]

An estimate of the design cooling load for each system (if available). Otherwise, a brief description of theoccupation of the cooled spaces, and of power consuming equipment normally used in those spaces.

[ ] [x]

Records of any issues or complaints that have been raised concerning the indoor comfort conditionsachieved in the treated spaces.

[ ] [x]

Optional

Where a BMS is used the manager should arrange for a short statement to be provided describing itscapabilities, the plant it is connected to control, the set points for the control of temperature, the frequencywith which it is maintained, and the date of the last inspection and maintenance.

[ ] [x]


RRN: 0990-2970-0542-0320-9090 of 23

Record Checklist Pre Inspection InformationLevel Information Required Reviewed Not Available

Where a monitoring station, or remote monitoring facility, is used to continually observe the performanceof equipment such as chillers, the manager should arrange for a statement to be provided describing theparameters monitored, and a statement reviewing the operating efficiency of the equipment.

[ ] [x]


RRN: 0990-2970-0542-0320-9090 of 23

Cooling Plant Equipment InspectedUnit Identifier SYS001

Component Identifier Cooling plant

Manufacturer Daikin

Description (type/details) Ceiling mounted single split system

Model/Reference FCQ125DV3B / RZQ125B8W1B (indoor/outdoor)

Serial Number 1706861 (outdoor)

Year Plant Installed 2007

Rated Cooling Capacity (kW) 12

Refrigerant Type R410A

Refrigerant Charge (kg) 4

Location of Cooling Plant Rear wall at ground level

Areas/Systems Served Shop floor

Note below any discrepancy between information provided by client and on site information collected, or any information of additional relevance to the cooling plant/system:n/a


RRN: 0990-2970-0542-0320-9090 of 23

This section applies to the following unit: Cooling plant

Cooling Plant Equipment Visual InspectionItem Ref Inspection Item Finding Notes and Recommendations

CS2.1 Is the refrigeration plant operational? Yes [x] No [ ] No issues - Refrigeration plant fully operational.

CS2.2/a Is the area around the refrigeration plant clearof obstructions & debris?

Yes [x] No [ ] Some debris present around the refrigeration plant.

Clear the debris on the floor around the refrigeration plant. This will improve access and also help to prevent thesystem coils or heat rejection equipment becoming blocked.

CS2.2/b Is the general condition of refrigeration andany associated central plant in good order?

Yes [ ] No [x] The filter unit on this system is dirty and requires cleaning.

Clean filter units. Where filters are allowed to build-up dirt and become blocked there is increased resistance onthe fan, thereby, increasing the energy consumption of the unit which causing the system to run inefficiently.

CS2.2/c Is the condenser placed clear from warm airdischarge louvres?

Yes [x] No [ ] No issues - No warm air discharge louvers nearby.

CS2.3/a Are compressors operational or can they bebrought into operation?

Yes [x] No [ ] System fully operational.

CS3.1/a Is the heat rejection plant operational? Yes [x] No [ ] No issues - heat rejection plant fully operational.

CS3.1/b Are condenser heat exchangers undamaged/un-corroded and clean?

Yes [ ] No [x] Heat exchangers appear undamaged but dirty.

The condenser fins are dirty and require cleaning. Heat exchangers should be kept clean and free of corrosion.Dirty heat exchangers increase system pressure and temperature. Every 1 degree increase in temperatureincreases energy use by 2-4%.

CS3.2/a Is the area around the heat rejection plantclear of obstructions & debris?

Yes [x] No [ ] Some debris present around the heat rejection plant although not causing obstruction.

Always make sure that the condenser units are free of any obstructions. Restricting airflow through eitherevaporator or condenser units of the refrigeration equipment prevents it from running efficiently.

CS3.2/b Is the condenser free of any possibility of airrecirculation?

Yes [x] No [ ] No issues.


RRN: 0990-2970-0542-0320-9090 of 23


CS4.1 Is the insulation on circulation pipe work wellfitted and in good order?

Yes [x] No [ ] All visible pipework is well fitted and in good condition.


RRN: 0990-2970-0542-0320-9090 of 23

Cooling Plant Detailed Inspection NotesItem Ref Item Inspection Item Finding Notes and Recommendations

Refrigerant Type R410ACS1.1 RefrigerantUsed Montreal/ODS/F-Gas

controlled?Yes [ ] No [x]

Is there evidence of regular maintenance? Yes [ ] No [x] Maintenance carried out as and when required.CS1.3 RegularMaintenance

Is the maintenance undertaken by suitablycompetent people and in accordance toindustry guidelines?

Yes [ ] No [x] Staff on site vacuum the system filters as and when required butno formal maintenance contract in place.

Consider implementing a system of planned preventativemaintenance of the air conditioning systems. Currently themaintenance for air conditioning at this site is reactive androutine tasks such as cleaning of filters are carried out by thestore's staff. A proactive approach to maintenance will ensurethat any faults with the systems operation or control settings aredealt with before they escalate, which in turn will help maximiseefficiency and improve the life span of the equipment.

Following Information Required:

Total Occupants served by this plant 15

Total Floor Area served by thisplant(m²)

226

Occupant Density (m²/person) 15

Maximum Instantaneous Heat Gain(W/m²)

160

Installed Cooling Capacity (kW) 12.5

The Installed Size is Deemed:

CS1.4CL1.1

AppropriatelySized CoolingPlant

More than ExpectedLess than ExpectedAs Expected

[ ][ ][x]

Building Regulations Approved Document Part L 2nd tierdocumentation provides guidance suggesting that the plantshould not be more than 20% oversized. This should be adoptedas means of comparison to stay in line with current standards.

Cooling loads are estimated to be 108 W/m2; Reference: CIBSETM44 for aeas served within 7m from window walls with glazingof greater than 60% having 160 W/m2 cooling requirementand 75 W/m2 away from window walls. 88m2 x 160 W/m2 =14,080 W. 138m2 x 75 W/m2 = 10,350 W. 14,080 W + 10,350W = Estimated cooling capacity requirement of 24,430 W.System size is 12,500 W, however, the area is also servedby a seperate 12,500 W unit. Total cooling capacity in area =25,000 W which is as expected being within +- 20% of estimatedrequirements.

CS1.6 MeteringComparisonto appropriate

Is metering installed to enable monitoring ofenergy consumption of refrigeration plant?

Yes [ ] No [x]


RRN: 0990-2970-0542-0320-9090 of 23


Recorded meter reading Metering notinstalled.

Is the refrigeration plant connected to a BEMSthat can provide out of range alarms?

Yes [ ] No [x] The system runs off its own local controllers with no out of rangealarms fitted.

Are there any records of air conditioning plantusage or sub-metered energy consumptionwith expected hours of use per year for theplant?

Yes [ ] No [x] Consider submetering the air condioning system to help monitorand target energy reduction and running costs.

energybenchmarks

Is the energy consumption or hours of useexcessive?

Yes [ ] No [x] This system is generally operated during store opening hoursthroughout the winter and as required during summer monthsalthough no formal records available.

CS2.2/d RefrigerationLeaks

Are there any signs of a refrigerant leak? Yes [ ] No [x] System in good condition and no evidence of refrigerant leak.Any future oil stains or frosting of refrigerant pipe work or valvesshould be reported to your service engineer as soon as possibleas this could be evidence of a refrigerant leak. It is the ownersresponsibility to ensure that all refrigerant on site is safelycontained and transferred correctly by qualified air conditioningengineers.

Refrigeration Temperature:

Pre Compressor(°C) 0

Post Compressor(°C) 0

Ambient(°C) 0

The Temperature is Deemed:


[ ][ ][x]

System temperatures will fluctuate throughout the day accordingto the heat load in the room and cooling demand. At the time ofhe inspection this system appeared to be operating satisfactorywith no excessive running of the compressors or short cyclingperiods, however compressor temperatures were not monitoreddue to inaccessibility. If, while the refrigeration equipmentis operating, both flow and return appear to be at the sametemperature, or warmer than the surroundings, then it is likelythe equipment has lost its refrigerant charge.

CL1.3 Refrigeration

Assess the refrigeration compressor(s) and themethod of refrigeration capacity control

This system incorporates and inverter drivencompressor that will vary refrigeration capacityas required.

No issues - very efficient system if well maintained.


RRN: 0990-2970-0542-0320-9090 of 23


Is the water flow through cooling towers orevaporative coolers even and efficient, andthere is no loss of water?

Yes [ ] No [x] n/aCS3.5 Water CooledChillers(Cooling Towers& EvaporativeCondensers)

Is there a management regime in place toensure that water is regularly checked andtreated to ensure that there is no Legionellarisk?

Yes [ ] No [x] n/a

HumidityControl

Is there separate equipment installed forhumidity control?

Yes [ ] No [x] n/a


RRN: 0990-2970-0542-0320-9090 of 23

Cooling Plant Equipment InspectedUnit Identifier SYS002

Component Identifier Cooling Plant

Manufacturer Daikin

Description (type/details) Ceiling mounted single split system

Model/Reference FCQ125DV3B / RZQ125B8W1B (indoor/outdoor)

Serial Number 1706673 (outdoor)

Year Plant Installed 2007

Rated Cooling Capacity (kW) 12

Refrigerant Type R410A

Refrigerant Charge (kg) 4

Location of Cooling Plant Rear wall at ground level

Areas/Systems Served Shop floor

Note below any discrepancy between information provided by client and on site information collected, or any information of additional relevance to the cooling plant/system:n/a


RRN: 0990-2970-0542-0320-9090 of 23

This section applies to the following unit: Cooling Plant


CS2.1 Is the refrigeration plant operational? Yes [x] No [ ] No issues - Refrigeration plant fully operational.

CS2.2/a Is the area around the refrigeration plant clearof obstructions & debris?

Yes [ ] No [x] Some debris present around the refrigeration plant.

Clear the debris on the floor around the refrigeration plant. This will improve access and also help to prevent thesystem coils or heat rejection equipment becoming blocked.

CS2.2/b Is the general condition of refrigeration andany associated central plant in good order?

Yes [ ] No [x] The filter unit on this system is dirty and requires cleaning.

Clean filter units. Where filters are allowed to build-up dirt and become blocked there is increased resistance onthe fan, thereby, increasing the energy consumption of the unit which causing the system to run inefficiently.

CS2.2/c Is the condenser placed clear from warm airdischarge louvres?

Yes [x] No [ ] No issues - No warm air discharge louvers nearby.

CS2.3/a Are compressors operational or can they bebrought into operation?

Yes [x] No [ ] System fully operational.

CS3.1/a Is the heat rejection plant operational? Yes [x] No [ ] No issues - heat rejection plant fully operational.

CS3.1/b Are condenser heat exchangers undamaged/un-corroded and clean?

Yes [ ] No [x] Heat exchangers appear undamaged but dirty.

The condenser fins are dirty and require cleaning. Heat exchangers should be kept clean and free of corrosion.Dirty heat exchangers increase system pressure and temperature. Every 1 degree increase in temperatureincreases energy use by 2-4%.

CS3.2/a Is the area around the heat rejection plantclear of obstructions & debris?

Yes [ ] No [x] Some debris present around the heat rejection plant although not causing obstruction.

Always make sure that the condenser units are free of any obstructions. Restricting airflow through eitherevaporator or condenser units of the refrigeration equipment prevents it from running efficiently.

CS3.2/b Is the condenser free of any possibility of airrecirculation?

Yes [x] No [ ] No issues.


RRN: 0990-2970-0542-0320-9090 of 23


CS4.1 Is the insulation on circulation pipe work wellfitted and in good order?

Yes [x] No [ ] All visible pipework is well fitted and in good condition.


RRN: 0990-2970-0542-0320-9090 of 23


Refrigerant Type R410ACS1.1 RefrigerantUsed Montreal/ODS/F-Gas

controlled?Yes [ ] No [x]

Is there evidence of regular maintenance? Yes [ ] No [x] Maintenance carried out as and when required.CS1.3 RegularMaintenance

Is the maintenance undertaken by suitablycompetent people and in accordance toindustry guidelines?

Yes [ ] No [x] Staff on site vacuum the system filters as and when required butno formal maintenance contract in place.

Consider implementing a system of planned preventativemaintenance of the air conditioning systems. Currently themaintenance for air conditioning at this site is reactive androutine tasks such as cleaning of filters are carried out by thestore's staff. A proactive approach to maintenance will ensurethat any faults with the systems operation or control settings aredealt with before they escalate, which in turn will help maximiseefficiency and improve the life span of the equipment.

Following Information Required:

Total Occupants served by this plant 15

Total Floor Area served by thisplant(m²)

226

Occupant Density (m²/person) 15

Maximum Instantaneous Heat Gain(W/m²)

160

Installed Cooling Capacity (kW) 12.5

The Installed Size is Deemed:

CS1.4CL1.1

AppropriatelySized CoolingPlant


[ ][ ][x]

Building Regulations Approved Document Part L 2nd tierdocumentation provides guidance suggesting that the plantshould not be more than 20% oversized. This should be adoptedas means of comparison to stay in line with current standards.

Cooling loads are estimated to be 108 W/m2; Reference: CIBSETM44 for aeas served within 7m from window walls with glazingof greater than 60% having 160 W/m2 cooling requirementand 75 W/m2 away from window walls. 88m2 x 160 W/m2 =14,080 W. 138m2 x 75 W/m2 = 10,350 W. 14,080 W + 10,350W = Estimated cooling capacity requirement of 24,430 W.System size is 12,500 W, however, the area is also servedby a seperate 12,500 W unit. Total cooling capacity in area =25,000 W which is as expected being within +- 20% of estimatedrequirements.

CS1.6 MeteringComparisonto appropriate

Is metering installed to enable monitoring ofenergy consumption of refrigeration plant?

Yes [ ] No [x]


RRN: 0990-2970-0542-0320-9090 of 23


Recorded meter reading Metering notinstalled.

Is the refrigeration plant connected to a BEMSthat can provide out of range alarms?

Yes [ ] No [x] The system runs off its own local controllers with no out of rangealarms fitted.

Are there any records of air conditioning plantusage or sub-metered energy consumptionwith expected hours of use per year for theplant?

Yes [ ] No [x] Consider submetering the air condioning system to help monitorand target energy reduction and running costs.

energybenchmarks

Is the energy consumption or hours of useexcessive?

Yes [ ] No [x] This system is generally operated during store opening hoursthroughout the winter and as required during summer monthsalthough no formal records available.

CS2.2/d RefrigerationLeaks

Are there any signs of a refrigerant leak? Yes [ ] No [x] System in good condition and no evidence of refrigerant leak.Any future oil stains or frosting of refrigerant pipe work or valvesshould be reported to your service engineer as soon as possibleas this could be evidence of a refrigerant leak. It is the ownersresponsibility to ensure that all refrigerant on site is safelycontained and transferred correctly by qualified air conditioningengineers.

Refrigeration Temperature:

Pre Compressor(°C) 0

Post Compressor(°C) 0

Ambient(°C) 0

The Temperature is Deemed:


[ ][ ][x]

System temperatures will fluctuate throughout the day accordingto the heat load in the room and cooling demand. At the time ofhe inspection this system appeared to be operating satisfactorywith no excessive running of the compressors or short cyclingperiods, however compressor temperatures were not monitoreddue to inaccessibility. If, while the refrigeration equipmentis operating, both flow and return appear to be at the sametemperature, or warmer than the surroundings, then it is likelythe equipment has lost its refrigerant charge.

CL1.3 Refrigeration

Assess the refrigeration compressor(s) and themethod of refrigeration capacity control

This system incorporates and inverter drivencompressor that will vary refrigeration capacityas required.

No issues - very efficient system if well maintained.


RRN: 0990-2970-0542-0320-9090 of 23


Is the water flow through cooling towers orevaporative coolers even and efficient, andthere is no loss of water?

Yes [ ] No [x] n/aCS3.5 Water CooledChillers(Cooling Towers& EvaporativeCondensers)

Is there a management regime in place toensure that water is regularly checked andtreated to ensure that there is no Legionellarisk?

Yes [ ] No [x] n/a

HumidityControl

Is there separate equipment installed forhumidity control?

Yes [ ] No [x] n/a


RRN: 0990-2970-0542-0320-9090 of 23

Air Handling Systems:Note: For safety reasons, it will be necessary for air handling fans in air distribution systems to be turned off in order to gain access inside air handlers or ductwork to examine components suchas fans, drives, filters, heat exchangers and control dampers. The building manager should arrange safe access for the inspector.


RRN: 0990-2970-0542-0320-9090 of 23

Terminal Units:


RRN: 0990-2970-0542-0320-9090 of 23

System Controls:

System ControlsItem Ref Inspection Item Finding Notes and Recommendations

n/a Sub System Identifier (if applicable) SYS001& SYS002combinedwall mountedcontroller

CS8.1 Is the zoning appropriate in relation toanticipated cooling demand?

Yes [x] No [ ] No issues

CS8.2 Note the current indicated weekday and timeof day on controllers or BMS against the actualtime.

Time of day setcorrectly at 9:03am.

CS8.3/a Note the set on and off periods (for weekdayand weekend if this facility is available with thetimer).

Timer settingsnot being used.

Make use of the cooling system controller capabilities with respect to time profile programmers. These can helpprevent out of hours operation and excessive energy consumption.

CS8.3/b Is there a shortfall in timer capabilities? Yes [ ] No [x] No issues

CS8.4 Identify and assess zone heating and coolingtemperature control sensors. Are the sensortypes and locations appropriate in relation toheating and cooling emitters, heat flows orlikely temperature distributions in the zone orspace?

Yes [x] No [ ] Thermisters are set within the unit to read the temperature of the return air and control the supply temperatureaccordingly. There are no remote sensors on this type of system.

CS8.5 Note the set temperature in each zone forheating and cooling in relation to the activitiesand occupancy of zones and spaces in relationto the manager's intent.

Temperatureset point of 20degrees Celsiusat the time ofinspection.

No issues. The air conditioning acts as the main heating system for the building during winter months andsetting it at lower temperatures during this period will help to save energy. During summer the Carbon Trustrecommends a set point temperature of 24 degrees celsius to prevent excessive energy consumption. Runningthe system at higher or lower temperatures will take longer to reach its set point and use more energy if left setup in this position.

CS8.6 Note whether a 'dead band' is, or can be, setbetween heating and cooling.

The split systemshave an inbuiltdeadband of 2-3degrees Celsius.

The Carbon Trust recommends setting a gap or dead-band between heating and air conditioning controltemperatures of about 4 degrees celsius. This improves staff comfort, cuts operating costs and reduceswearandtear on both systems.


RRN: 0990-2970-0542-0320-9090 of 23

System ControlsItem Ref Inspection Item Finding Notes and Recommendations

CS8.7 Do the sub system controls integrateeffectively with the overall system controlstrategy?

Yes [x] No [ ]

CS8.8 Assess the means of modulating or controllingair flow rate through the air supply and exhaustducts.

Air flow ismodulated by fanspeed controllerlocated on indoorunit. No extracton this system,just recirculatedair.

PS3.6 Are guidance notices visible or controlsavailable to inhibit use of cooling equipmentwhilst windows are open or cooling/heating ison?

Yes [ ] No [x] No guidance notices available.

Official guidance notices should be placed next to the wall controller encouraging staff to turn the system offwhen the room is vacant. The guidance should also explain that opening windows (where fitted) and doors willmake the system work harder to reach its set-point temperature and subsequently waste energy.

air conditioning inspection reportproperty.shw.co.uk/documents/brighton, 48-50 western road,...

Documents