Sequence of Installation for the Chiller Plant Manager Field Devices
Safety
- All site safety rules & regulations shall be complied with.
- Supervisors will deliver tool box talks, relevant to these activities to all operatives involved in the installation and shall be recorded.
- All operatives will be equipped with minimum personnel protective equipment; hard hat, coveralls, safety boots, safety glasses.
- Ensure only qualified personnel shall install the Chiller Plant Manager Field devices.
- During Installation display warning sign boards to be provided and barricade the area whenever necessary.
- Only competent, experienced & trained personnel shall perform all the required activities stated in this method statement.
- Ensure that all operatives fully understand the method of these activities.
Pre- Installation Procedure
- Before commencement of installation activity, the supervisor must ensure that:
- Delivered Chiller Plant manager field devices have been inspected & approved via MIR by the consultant prior to installation at site.
- All Installations & Pressure Testing of Pipe works/ Ductworks (if applicable) have been completed & approved by the consultant.
- Determine whether the field devices are to be installed at the right location as shown in the approved drawing
- Permission to start or Civil Clearances prior to installation has been given by the main contractor.
- All applicable relevant Shop drawings for the installation of the Chiller Plant Manager Field devices shall be available & approved by the consultant. No installation shall be done without Approved Shop Drawings.
- Installation activities shall only commence when all associated works by the Civil has been completed.
- Safe access shall be provided by the Main Contractor thru Work Permit in coordination with the Safety in charge at site.
- Check for other services, making sure that there is no interference between each service & adequate access to work and for future maintenance can be maintained.
Installation Procedure for Water Differential Pressure Sensor (WPD)
- PVC tubing with ferrule nut connections or steel pipe with male threads will be used as a connection of WPD.
- Ensure proper location of the units as per the approved shop drawings.
- The transmitter mounts on a vertical surface with the pressure ports and cable entrance on the bottom using the two screw holes on the base of the unit.
- Ensure there is enough space around the unit to make the pressure and electrical connections.
- Avoid locations with severe vibrations or excessive moisture.
- The enclosure has a standard ½” conduit opening and may be installed with either a conduit coupler or a cable gland type fitting.
- The two pressure ports are labelled High and Low.
- The output signal indicates a positive value when the pressure is higher on the High port than the Low port so ensure these ports are connected correctly.
- Use appropriately rated pressure tubing and arranges it to minimize stress on the connections.
- Do not allow material to fall into the pressure ports as contamination could damage the sensors.
- Use 22 AWG shielded wiring for all connections and do not locate the device wires in the same conduit with wiring used to supply inductive loads such as motors.
- Disconnect the power supply before making any connections to prevent electrical shock or equipment damage.
- Make all connections in accordance with national and local electrical codes.
- This device is a 3-wire sourcing type transmitter. Connect the positive DC voltage or the hot side of the AC voltage to the terminal marked PWR.
- The power supply common is connected to the terminal marked COM.
- The device is reverse voltage protected and will not operate if connected backwards.
- The analogue output signal is available on the OUT terminal. This signal is jumper select-able for either voltage or 4-20 mA output.
Installation Procedure of Differential Pressure Switch Across Pumps (AX-LDPS)
- Ensure proper location of the units as per the approved shop drawings.
- The AX-LDPS is for use in systems under pressure and should be installed in accordance with practices relevant to the intended use only by persons qualified to do so.
- The AX-LDPS is suitable for use with mains voltage and power must be isolated before opening the cover.
- The AX-LDPS should be mounted on a wall or other suitable surface using the bracket provided.
- Pipework should then be installed to the unit and terminated at the high and low ports using the 1/4”BSP fittings.
- Ensure that the pipework is suitable for the system pressure
- Cable connection- 1.5sqmm cable should be connected to PIN1 (Normally Open)and PIN3 (Common).
Download Complete Method Statement With ITP, Checklist and Risk Assessment