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The purpose of this procedure or safe work method of statement is to define the step by step method to implement the correct practices for the precommissioning & commissioning of “Building Management System“.

Through the guidelines contained herein so as to ensure that the job execution complies with the project requirements and serves the intended function to satisfactory level.

Below is the list of required Tools before starting the works:

Note : All measuring instruments shall be calibrated with valid certifices.

Precommissioning Procedure for Building Management System

  1. Ensure that the installation of the BMS componets are complete & mechanical completion is approved & all comments on the mechanical & electrical installation inspections are incorporated.
  2. Ensure that no damage has occured between mechanical completion & precommissioning.
  3. Replace damaged components, if any.
  4. Ensure the installation of BMS components are in line with the approved shop drawings & manufacturer’s recommendations.
  5. Ensure that all the relevant system have been precommissioned & commissioned as standalone systems.
  6. Switch OFF all parts of the system which are commissioned.
  7. Check all peripheral device are mounted & connected. All mechanical installation shall be visually checked for correct application / location.
  8. Check all the wires & cables are correctly connected inside the control panels / DDC controllers & to the peripheral devices.
  9. Check the control panel input terminals for interference voltages. Interference voltages are checked with an AC range voltmeter, by measuring the voltage at each input terminal in the control panel with respect to earth.
  10. All control cables will be point to point tested by means of a multimeter.
  11. Fan Coil Units: Ensure all FCU controllers (RXC 21.1) are installed & connected  via communication bus.
  12. Sensors, DP switches & control valves: Ensure that the installation of all the sensors, DP switches, valves, are completed mechanically & electrically.

Commissioning of Building Management System

AHUs, FAHUs,Fans

  1. Application software shall be loaded into all controllers as required. Individual systems will be tested & commissioned adjusting control loops (temp control, speed control, etc.,) & programming
    set points & time channels.
  2. Individual systems will be commissioned adjusting the control loops & programming any local time programes, etc.,
  3. Motorised valves & dampers will be stroked through 0-100%.
  4. Temperature & relative humidity sensors will be proved by raising & lowering set points & comparing values read on the operator terminal with a suitable calibrated measuring device.
  5. DP switches will be proven by opening & closing the switch and monitoring its position on the operating terminal. DP switches are used to measure the the differenctial pressure across fans & fiters.
  6. The method of proving vendor equipment (like FCUs,AHUs,FANs,etc.,) where a volt free contact is supplied will be by opening & closing the contacts & monitoring in operator terminal.
  7. Incase of any anomalies the program will be optimised.

Fan Coil Units
Each FCU will be addressed & have parameters loaded into the controllers using RXT 10.1 software from single point. There after valves will be operated from a single location to prove addressing and at the same time temperature checks shall be carried out in rooms with a suitable calibrated temperature device.

VAV Units
Ensure that the air balancing is completed. The VAVs shall be dealt with in the same way as FCUs.

Temperature Sensor

Air Flow Switch

Dirty Filter Switch

Simulation of filter dirty condition will be achieved by creating differential pressure across the probes of the switch. This can be achieved by covering the flow switch inlets by a polythene sheet or card board. Actual pressure setting shall be done based on the recommendation of the equipment manufacturer.

Humidity Sensor

Control Valve

Motorised damper actuators

Start / Stop command

Testing of start/stop command will be carried out with the help of portable operator terminal. Pre-programmed time channels shall start / stop the equipment at desired times. Override command can be given through operator terminal & switching ON/OFF of the equipment can be monitored physically as well as through operator terminal.

Interface with major equipment

The interface with the following equipment shall be checked:

Verification of Inputs & Outputs

Digital input / alarm

Digital output

Testing of start/stop commands will be carried out with the help of the portable operator terminal. Operation of the relevant starters will be observed.

Analog input
Testing analog input (0-10V) will be carried out with the help of the portable operator terminal. The accuracy of analog signal read bythe controller will be cross checked with the help of multimeter & operator terminal.

Analog output

Testing analog output (0-10V to VFDs) will be carried out with the help of portable operator terminal. The accuracy of analog signal given by controller will be cross checked with the help of multimeter and operator terminal. The respective change in the valve position/ VFD speed, etc., speed shall be observed physically.

Performance Records

The control parameters set point shall be tuned & the same shall be verified & recorded. The Desigo insight & the graphic software shall be commissioned & the display values shall be recorded. The central work station shall be configured & necessary graphics/ alarms/ reporting softwares shall be installed. Site specific plant graphics shall be developed & all dynamic measurand shall be displaced. The graphic display shall be compared with the operator terminal display values & recorded.

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