Mechanical electrical trade to provide all necessary DDC controls and controls infrastructure to control the HVAC equipement.
An AE-200E Centralised Controller to be provided for control of all AC equipment with fault indication at the panel.
Controller to limit the permissible set points for the local AC controllers to 21°C-25°C. All AC’s to have capability to be programmed with time clock controls on proprietary controller.
DDC controls to be provided to achieve controls philosophy.
Mechanical contractor to install a building “kill” switch adjacent to building security alarm panel.
This is to be a push button with an LED showing when systems are active, LED to deactivate when system is “killed”. “Kill” switch to cause a controlled software shutdown through DDC controls of all AC equipment.
All equipment to automatically restart on following day based on time clock controls. “Kill” switch push-button also to re-activate system by being pressed for 2 seconds (In case of accidental/premature shutdown of AC).
Supply proprietary controls for all air conditioning equipment.
This will enable the following:
- Run/ Fault monitoring at MSSB’s.
- Temperature control.
- Programmable time clock controls.
- Fan speed controls.
- Ability to individually lock out elements of the controls (e.g. temperature control, time clock, fan speed) with passwords or similar.
Local Ventilation Systems
The fans are to be switched by individual Auto/Off/Manual switches on the MSSBs. In auto position, the fans shall start under time schedule control from the DDC controls, unless interlocked with an AC system or provided with local control.
Each fan shall be assigned a separate run time schedule in the DDC controls, provide status monitoring of each exhaust fan, and provide an alarm for a ‘fault’ situation of the motor.
Kitchen Ventilation Systems
The exhaust fan and evaporative cooling unit are to be switched by individual Auto/Off/Manual switches on the MSSBs. In auto position, the kitchen exhaust will operate based on the kitchen hood local inherent switch.
The evaporative unit is to be interlocked with the kitchen hood and map evaporative unit supply air volume to kitchen exhaust hood speed settings, to enable the supply air volume at the hood to be the same proportion of exhaust air at all kitchen exhaust hood exhaust flow rates.
Each fan shall be assigned a separate run time schedule in the DDC controls, provide status monitoring of the exhaust fan and evaporative units and provide an alarm for a ‘fault’ situation of the motors
Amenities exhaust and supply.
Toilet exhaust is via the proprietary heat exchange unit.
The unit needs to have auto changeover on exhaust fan failure and fans to be provided in a duty/standby arrangement, with each fan assigned a separate run time schedule in the DDC controls.
The lead fan is to rotate for equal wear time. Nominally on a weekly basis. Provide status monitoring of each fan (3 off) on the MSSB and provide an alarm for a ‘fault’ situation of the motor.
CO2 control Monitor the concentration of CO2 in the return air stream and regulate the amount of outside air by modulating the motorised outside air and motorised return air dampers.
Proportional control to maintain a CO2 level between 600 and 900 ppm.
CO2 system setup using EASY IO controls.
Design, Manufacture, and Installation of mechanical services switchboard.