BMS COMMISSIONING CODE C_CIBSE

Automatic controlsAutomatic controlsCIBSE C i i i C d C 2001CIBSE Commissioning Code C: 2001

Presentation by N. A. Chazapis, Commissioning Consultant AthensCommissioning Consultant, Athens -

Greece.

BMS Pre commissioningBMS Pre-commissioning• Control Application

SoftwareGeneral

• Control Panels– Introduction

Panel tests (preliminaries)– General– Set points– Time schedules

– Panel tests (preliminaries)– Panel tests (visual outside)– Panel tests (Inside)

– Interlocks– Control loops

( )– Flash tests– Function tests

– Sequencing– Start up and shutdown

Plant changeover– Plant changeover– Alarm functions– User Interface software

BMS Pre commissioningBMS Pre-commissioning

• Wiring– Cable type as specifiedyp p– Cable identified at both ends

Cable cores identified at both ends– Cable cores identified at both ends – Security of fixing/protection of cables to walls– Cable carrier (tray, basket, conduit/trunking)– Cable management according to specsg g p– Screening continuity


• Communication networks– Check that all network devices are inst correctlyy– Check that all control devices can be addressed

All network data set up by the IT dept– All network data set up by the IT dept.– Network testing comply with EN-50174-1– Structured cabling: all outlets properly labeled– Changes are reflected & updated in g p

documentation


• Sensors– Correct location & orientation– Adequate access for commissioning

Type of sensor as specified– Type of sensor as specified– Appropriate sensor identification– Sensor wired correctly– Check sensors using a calibrated instrumentg– Sensor replaced where the req. offset is high


• Actuators and valves– Check correct location– Check adequate access for Cx

Check type of actuator as specified– Check type of actuator as specified– Check actuator linkage– Check correct identification– Check valve ported correctlyp y– Drive the valve using control system


• Digital Inputs/Outputs– Check that the signal DI is sensed correctlyg y– Check that each contact assumes its correct

normally open or closed statenormally open or closed state– Check that each DO switches the correct item

of plantof plant– Ensure that each check is entered on the

l t h kli trelevant checklist

BMS Pre commissioning

Fi ld t l d i

BMS Pre-commissioning

• Field control devices– Check size as specified– Check enclosures as specified– Check number and location as specifiedp– Check adequate mechanical fixing– Check identification by mnemonic labellingCheck identification by mnemonic labelling – Check all cables terminated & identified

Check continuous power available– Check continuous power available– Check fuse correct type/spares

BMS CommissioningBMS Commissioning

• Control strategy checking:– Time schedules

• Check that time schedules enable the indented plant• Check that any out-of-occupancy period, weekendCheck that any out of occupancy period, weekend

and holiday time schedules operate correctly• Check that the spec routine to ensure unified time p

clocks throughout the complete control system opts• Check that any specified summer/winter seasonal

changes to control strategies are enabled


• Control strategy checking:– Interlocks

• Check the correct operation of interlocks by individually switching interlocked items of planty g p

• Check all safety interlocks• Check the spec interl between different control sysp y• Check the spec temper interlocks operate correctly

– Low inside air temp activates all duty heating plant– Low inside air temp


• Control strategy checking:– Control loopsp

• Check attainment of desired set point• Check above, within specified time following start-upCheck above, within specified time following start up• Check stability of control loop (avoidance of hunting)• Check minimal overshootCheck minimal overshoot• Control loop should be tuned if the above

characteristics are not attained• Data logging should be performed to proof.• Check for satisfactory loop cycle/response lags.Check for satisfactory loop cycle/response lags.


• Control strategy checking: – Sequencingq g

• Check for correct sequencing control (in response to varying plant loads) of items of plant such as y g p ) pboilers and chillers.

• Check for operation in correct order and at the desired set points.


• Control strategy checking: – Start-up and shutdownp

• Check for the correct control of plant on start-up• Check for the correct status of plant items such asCheck for the correct status of plant items such as

dampers and valves on plant shut down.• Check that the defined restart routine operates p

correctly when power is rein started after a failure• Check for any specified sequenced start-up to

accommodate high loads.


• Control strategy checking:– Plant Overrun

• Fan overrun: Check that the fans operate for the specified period following a period of operation of p p g p pthe vent.n system during which an electric heater battery has been in operation.

• Pump overrun: Check that the pumps operate for the specified period following a period of operation of the boilers and chillers to allow temperatures toof the boilers and chillers to allow temperatures to stabilize in order to prevent spurious tripping of safety devices.safety devices.


• Control strategy checking: – Plant changeoverg

• Check automatic changeover of plant failure by manually “failing” specific items of plant.y g p p

• Check automatic changeover of plant in response to the specified number of run hours being exceeded by manually increasing the run hours.

• Check the sequence of events following the failure f th d t db it f l tof the second or standby item of plant.

BMS Commissioning

C t l t t h ki

BMS Commissioning

• Control strategy checking:– Alarm functions

• Check operation of each alarm function by triggering an alarm condition.Ch k th t ti d l h l i il bl• Check that a time delay on each alarm is available as specified.

• Check that any specific post-alarm controlCheck that any specific post alarm control functions, operate correctly.

• Check that alarm masking is in place so that no gspurious alarms are raised.

• Check the level or category of each alarm.


• Checking Procedures for basic control functions– Optimizer

• Optimum start heating: check that the specified intl• Optimum start heating: check that the specified intl temp is reached at the start of occupancy

• Check that the maximum pre-heat time isCheck that the maximum pre heat time is incorporated

• Check that the compensator control is overridden pand maximum heat output achieved during tha pre-heat period.

BMS Commissioning

Ch ki P d f b i t l

BMS Commissioning

• Checking Procedures for basic control functions– Compensation:

• Check that the compensator gives the specified control function in response to changes in the internal and external air temperatures.

• Check that each compensator control function is• Check that each compensator control function is related to the correct internal temperature sensor and heating plant zone.

• Check that the comp_cont_funct is overridden during operation of the optimizer control function.


• Checking Procedures for basic control functions– Mixed damper control:

• Check that the re-circ n damper is in the full re-• Check that the re-circ.n damper is in the full re-circ.n position and the OA and EA dampers are closed when the AHU is not in operation.p

• Check that the damper positions are such that the specified req.d for min.m fresh air is met during plant operation. Air flow measurement should be performed by the mech services Cx engineer.

BMS Commissioning

Ch ki P d f b i t l

BMS Commissioning

• Checking Procedures for basic control functions– Mixed damper control:

• Free Cooling: Check that the OA & EA dampers modulate towards fully open when the RA temp is greater than the OA temp and cooling is requiered

• Free Cooling: Check that the dampers modulate to• Free Cooling: Check that the dampers modulate to ensure the minimum OA flow rate is supplied when the RA temp is greater than the OA and heating is required or when the RA temp is less than the OA temp and cooling is required.


• Checking Procedures for basic control functions– Demand Controlled Ventilation (DCV)

• Check that the specified min fresh air requirem t is• Check that the specified min. fresh air requirem.t is not compromised by the DCV control routine.

• Check that the plant operates and the dampersCheck that the plant operates and the dampers modulate to allow an increase in ventilation rate when the CO2 set point is exceeded.

• Check the highest demand priority, between DCV and “free cooling”

BMS Commissioning

Ch ki P d f b i t l

BMS Commissioning

• Checking Procedures for basic control functions– Control of natural ventilation

• Check any specified manual overrides operate• Check any specified automatic overrides operate• Check prevention of ingress of cold OA• Check prevention of vents opening if the OA temp

is above the IA temp and cooling vent/n is req/d• Check prevention of rain ingress• Check prevention of rain ingress.• Prevention of vents opening in the event of high

wind speeds.p


• Lighting Controls– Daylight-linked/lumen maintenancey g

• Check that the light sensor is located in a rep location. Calibrate the sensor to give the spec/d g plight levels.

• The calibration should take place at the lighting controller, or operator workstation, not direct at the sensor itself.

BMS Commissioning

Li hti C t l

BMS Commissioning

• Lighting Controls– Occupancy sensors

• Check that the zone occupancy sensor is located and oriented correctly in relation to occupants.Ch k th t th iti it i• Check that the occupancy sensor sensitivity is appropriate. Too low a sensitivity will result in seated occupants not being detected, while too p g ,high a sensitivity may result in movement outside the zone activating the lights.Ch k th ti d l tti i t ti f• Check the time delay settings is representative of the occupant work/movement patterns.


• Lighting Controls– Manual dimmingg

• Check that the upper and lower limits of the dimming range are as specified.g g p


• Lighting Controls– Sweep-offp

• Check that the start and stop times along with the override control (e.g occupant or security staff ( g p yoverride) are as specified.

BMS Commissioning

O t W k t ti

BMS Commissioning

• Operator Workstations– Check that the specified s/w release is installed– Check that passwords and associated access

levels are set up correctly.– Check that all outstations and unitary control

devices can be addressed and data sent and retrieved.

– Check that any spec/d plant/bldg schematics are displayed correctly on request.

– Check that data logging functions operate.


• Occupant interfaces– Check that the physical location of occupant p y p

control devices is correct– Check that each occupant control deviceCheck that each occupant control device

controls the correct items of the plantCheck that the OCD / plant zoning– Check that the OCD / plant zoning relationship is correctCh k th t th t l b d f th OCD i– Check that the control band of the OCD is as specified


• Communications networks– Check that all control devices can be

addressed over the communications network– Check that the speed of comm/s meets thatCheck that the speed of comm/s meets that

specified. It is important that this is assessed when the network is under “normal” cond/swhen the network is under normal cond/s

– Check that the data comm/s are error-freeCh k th t ti f d t– Check that no cross corruption of data occurs

– Check other devices: routers, bridges.


• Integrated systems – gateways– Check that the gateway drivers convert g y

between the two communications protocols.– Check that the functionality of the gatewayCheck that the functionality of the gateway

meets the spec/s.Check that the as specified transfer of data– Check that the as specified transfer of data over the gateway occurs. Ch k th t th ti d l i d i– Check that the time delays experienced in transfer data do not exceed the spec/d max.


• Integrated systems – direct interoperabilityp y– Check the degree of direct interoperability.

Check the functional profiles that define the– Check the functional profiles that define the data which can be transferred for specific items of plantitems of plant.

– Check that the data transferred between the diff t f t t l d tdifferent manufacturers control products meets the specified functional profiles.


• Integration with fire detection systems– Integration for monitoring (uni-directional)g g ( )

• Increasingly common (alarm status).• Check the status info for each fire alarm detectorCheck the status info for each fire alarm detector

can be viewed on the BMS operator PC.• Check that any spec/d bldg graphics indicating the y p g g p g

location of detector heads can be viewed w. status• Check that a fire alarm cond/n automatically

displays the appropriate bldg graphic.• Check time delays receiving fire alarm data.


• Integration with fire detection systems– Integration for monitoring (bi-directional)g g ( )

• Check that the alteration of any fire alarm parameter via the BMS has no adverse effect on pthe correct operation of the fire alarm system.

• Test re-setting of alarm sounders. • Test changing thresholds on detector heads.• Test isolating fire detection devices & sounders.• Test partial system re-configuration. • Check that loss of electrical power to the BMS has p

no adverse effect on the fire detection system.

BMS Commissioning

I t ti ith fi d t ti t

BMS Commissioning

• Integration with fire detection systems– Integration for control

• Control smoke protection plant such as smoke vents, and fans for escape route pressurization systemssystems.

• Check that the BMS can receive fire alarm data originating from each detector and within time limitg g

• Check for correct control logic in response to a fire alarm condition on a point-by-point basis.

• Confirm that the correct plant is activated in the spec/d sequence.


• Security systems – Intruder alarm– Check that the status information for each

specified detector can be viewed on the W/S.– Check that any specified graphics indicatingCheck that any specified graphics indicating

the location of detectors can be viewed.Check that an alarm condition results in the– Check that an alarm condition results in the automatic display of the appropriate graphic.Ch k th t ti d l i i i– Check that any time delay in receiving an alarm is within the specified maximum.

BMS Commissioning

S it t A t l

BMS Commissioning

• Security systems – Access control– Check that the BMS operator W/S displays

the specified status information from the access control system (ACS).

– Check that any time delay in receiving data from the ACS system is within the spec/d max

– Check that any spec/d bldg services control actions operate correctly in response to the t t f th ACSstatus of the ACS.

– Check that ACS are correctly integr/d with Lifts & EscalatorsLifts & Escalators.

BMS CommissioningI t ti f l t i l l

BMS Commissioning• Interruption of electrical power supply

– Check that the controllers preserve control strategy configuration data for a spec/d periodstrategy configuration data for a spec/d period when mains power is lost.

– Check that the condition of any volatile dataCheck that the condition of any volatile data protection system is regularly and automatically monitored.

– Check that an alarm is raised on loss of data by any controller or other device and/or failure of the monitoring systemof the monitoring system.

– Check that the control system operates correctly under generator standby and UPScorrectly under generator standby and UPS power.

BMS Commissioning

S ifi Pl t C V l

BMS Commissioning

• Specific Plant Cx – Valves– Confirm that the valves have been correctly

selected, installed, and applied.– Check the characteristic positioner, linear or

equal percentage.– Under dynamic conditions:

• Drive the valve across the whole span.• Check the max and min positions• Check the rate of valve movement and whether it

meets that specified.


• Specific pant Cx – Dampers– Check that the dampers are correctly installed p y

and applied.– Check that all damper sections & linkagesCheck that all damper sections & linkages

operate synchronously.Check the max and min positions and rate of– Check the max and min positions and rate of movement.Ch k /d i t l ki ith th f– Check any spec/d interlocking with other fans.

– On receipt of a fire signal check the spec.pos.

BMS Commissioning

S ifi l t C F ( i l d)

BMS Commissioning

• Specific plant Cx – Fans (single speed)– Panel controls (power, fan run/trip, fuses, )– Hardware:

• Check the fan rotates in correct direction.• Check start/stop by the application s/w.• Check correct fan status & mnemonic.

– Interlocks:• Appropriate interlocks and overrides, with plant in

ffmanual, off, auto modes.• Check the fans operate as spec/d under fire alarm.


• Specific plant Cx – Fans (single speed)– Alarms:

• Set the fan air flow failure device to the desired value and simulate a no flow condition.

• Check an alarm is initiated and fans are shutdown.• Set the alarm inhibit time for the air flow failure

device to a time consistent with the fan start.• Check that on fan failure the corresponding supply

or extract fan switches off.


• Specific plant Cx – Fans (variable speed)


• Specific plant Cx – Pumps and Inverter banks (batteries).( )


• Specific plant Cx- Terminal units – FCU and VAV units.


• Specific plant Cx – Heating and Cooling coils.


• Specific plant Cx – CHW dehumidification coils


• Specific plant Cx – Humidifier steam & sprayp y


• System Handover - Witnessing


• System Handover – Documentation Operations and Maintenance Manualp


• System Handover – Operator Training


• Post-occupancy checks – Complete performance checking – global checksp g g


• Post-occupancy checks - Complete performance checking – system level checksp g y

BMS COMMISSIONING CODE C_CIBSE

Engineering

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