This hvac method statement covers the supply & installation of chiller plant manager field devices in line with project requirements as indicated in the shop drawings, project specifications and manufacturer’s installation instructions.
Following tools shall be arranged before starting the job.
- Mechanical Tool Box
- Electric Drill Machine
- Step Ladders
- Threading Machine
- Solvent Cement
- Electric welding machine (if required)
- Torque Wrench
- Pipe Cutting Machine
- Grinding Machine
- Pressure Gauge
- Water Level Marker
- Mobile Scaffolds
- Staging Platforms
Chiller plant manager field devices are normally shipped in safe conditions and carefully loaded in containers with crating / boxing, hence, in case of transit damage, supplier must be informed immediately. Special care must be taken to ensure that the devices are carefully handled. Use appropriate type of vehicles in transporting the units and also make sure that they are protected against mechanical and weather affects.
All the received field devices shall be checked & inspected to ensure that it is complying with the approved material submittals prior to storing on the site
Health and Safety Requirements
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 attendance shall be recorded.
All operatives will be equipped with minimum personnel protective equipment; hard hat, coveralls, safety boots, safety glasses.
During installation display warning sign boards 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 requirements of this method statement.
Pre- Installation Procedure
Before commencement of field devices installation activity, the supervisor must ensure that:
Delivered chiller plant manager field devices have been inspected & approved via MIR by the consultant.
All applicable relevant shop drawings for the installation of the Chiller Plant Manager Field devices are available & approved by the consultant, no installation shall be done without approved shop drawings.
All relevant installations & pressure testing of pipe works/ ductworks (if applicable) have been completed & approved by the consultant.
Select correct type and size of the field devices as per the locations shown in the approved drawings.
Obtain the civil/mep clearances prior to installation of chiller plant manager field devices.
Installation activities shall only commence when all associated works by the civil/mep has been completed.
Safe access shall be provided by the main contractor via work permit system in coordination with the safety in charge at site.
Check for other services, making sure that there is no interference between each service and adequate access to work and 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.
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 arrange it in a way 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.
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 selectable 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.
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).
Installation Procedure for Outside Air Temperature and Humidity Sensor
Ensure proper location of the units as per the approved shop drawings.
Read these instructions carefully before installing and commissioning the RH transmitter.
Select a suitable mounting spot on an exterior wall where the RH300A is best protected from direct exposure to sunlight, wind, etc. preferably on a north facing wall.
Avoid areas where the sensor is exposed to vibrations or rapid temperature changes.
The RH300A provides a connection hole for 1/2″ Conduit. Run a length of conduit through exterior wall and seal.
Use 14-22 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.
Make all connections in accordance with national and local codes
Deactivate the 24 VAC/DC power supply until all connections are made to the device to prevent electrical shock or equipment damage.
Pull at least six inches of wire through the wall and into the enclosure, then complete the wiring connection according to the wire diagram for the applicable power supply and output signal type.
Select desired signal output type by placing the output jumper in required position.
Connect the plus DC or the AC voltage hot side to the PWR terminal.
For voltage output or AC power, the supply Common is connected to the COM terminal
The device is reverse voltage protected and will not operate if connected backwards
It has a half-wave power supply so the supply Common is the same as the signal Common.
Installation Procedure for Chiller Plant Manager panels (DDC-01, DDC-02, DDC-03)
Identify proper location of the DDC panel as per the approved shop drawings.
Ensure that the components of the Chiller plant manager DDC panels general arrangement is as per the approved panel drawing.
Check the continuity of the all the cables before connection.
Proper ferruling/Identification or wires are done before connection.
Connect the cables as per the cable schedule and terminate the wiring in the terminal as per the termination drawings.
Check the 230 volt AC power connection is done correctly in the terminals.
Check whether the Communication cables have been laid in a separate conduit away from the power cables.
Check whether low voltage input and output signal cables are running in a separate conduit 300 mm away from high voltage power cables.
Check the digital input/ output and Analog input/ output signal are properly connected to the DDC controllers.
Ensure proper earth connection for all the panels.
Installation Procedure for Chiller Plant Manager Workstation
Ensure that the computer unit delivery is as per the approved make.
Unpack the cover to take out the monitor, CPU, keyboard and mouse.
Connect the peripheral such mouse, keyboard and monitor to the CPU as instruction in the manual.
Connect the power supply to the CPU and monitor.
Assigned the IP address to the work station.
Check proper network connection to the Chiller plant manager.
Establish the connectivity between chiller plant manager and the PC workstation on the Ethernet.
Installation Procedure for Alarm Printer and Report Printer
Ensure that the computer unit delivery is as per the approved make.
Unpack the cover to take out the Printer and assemble the printer’s loose parts such as ribbon, tray etc. as per manual.
Connect the power supply to the Printer
Connect the communication cable between Printer and CPU
Set up the driver for printer.
Load paper as per the installation manual.
Establish the connectivity between workstation and the Printer by giving a test print.
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