C05_Exhibit_01_2022-12-21_Chilled_Water_Hydronic_Schematic_and_Sequence.pdf
PDF 179 KB Posted
- Attached to
- Parker Dam Power Plant HVAC Chiller
- Solicitation number
- 140R3024Q0079
About this file
This document appears to be a chilled water hydronic schematic and control sequence for the HVAC system at the Parker Dam Power Plant. The schematic diagram shows the chilled water system components, including the chiller, chilled water pumps, air handling units, and required valves and instrumentation. The control sequence details how the chilled water system will be enabled, staged, and controlled to maintain the desired chilled water supply temperature. Key points include:
The chilled water pumps will operate in a variable primary mode, with the pump bypass valve used to control differential pressure. The chiller will be enabled when the chilled water supply temperature rises above the setpoint, and will then operate under factory control to maintain the 43°F supply temperature. Multiple chilled water pumps will be software-controlled to operate as lead/lag, with automatic changeover on pump failure. Overall, this document provides the technical details and control logic for the chilled water hydronic system at the Parker Dam Power Plant.
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Text version
GENERAL NOTES
A. ALL WORK SHOWN SHALL COMPLY WITH ALL NATIONAL, STATE AND LOCAL CODES
AND ORDINANCES.
B. REFERENCE ALL OTHER DRAWINGS AND SPECIFICATIONS FOR ADDITIONAL WORK
OR CLARIFICATION OF NECESSARY WORK.
MAIN LEVEL
4" CWS
BUFFER TANK
MIN. 600 GAL
SCALE: NO SCALE
CHILLED WATER SCHEMATIC DIAGRAM1
ANALOG THERMOMETER
CHILLER
PUMP
CH-1 CHILLER PACKAGE WITH PUMP(S)
4" CWR
4" CWS
AHU-1
200GPM
4" CWR
COOLING COIL
CWS MAIN
CWR MAIN
PROVIDE HOSE CONNECTION WITH
SCREW-ON CAP WITH RETAINER CHAIN
1/2" BALL VALVE (AIR VENT)
ROUTE MANUAL AIR VENT OUTLET WITH
2 ELBOWS TURNED DOWN AT LOCATION
WHERE THERE IS BUCKET ACCESS
PRESSURE & TEMPERATURE TEST
PORTS (TYPICAL OF 4)
AUTO FLOW VALVE
REDUCER TO SIZE OF COIL CONNECTION
BRASS BALL
VALVE (TYPICAL OF 2)
NOTE: AUTO FLOW VALVES SHALL BE
SIZED BASED ON SCHEDULED FLOW.
COOLING COIL
DRAIN VALVE DISCHARGE TO FLOOR DRAIN.
TERMINATE WITH AIR GAP
MANUAL BALANCING VALVE, TYP.
NOTE:
DIAGRAM PROVIDED IS SCHEMATIC IN
NATURE. PROVIDE ALL OFFSETS,
FITTINGS, VALVES, AND PIPING WITHIN
AIR HANDLER AS REQUIRED.
MULTIPLE COOLING COIL PIPING
SCALE: NO SCALE
MULTIPLE COOLING COIL PIPING SCHEMATIC2
HYDRONIC (CHILLED WATER) CONTROL SEQUENCE
1. CHILLERS SHALL BE ENABLED BY AHU STATUS INDICATING A CALL FOR COOLING AND BUILDING OCCUPANCY SCHEDULE.
2. CHILLER SHALL BE STAGED UNDER FACTORY CONTROL.
3. CHILLED WATER PUMPING SYSTEM SHALL OPERATE IN A VARIABLE PRIMARY MODE.
ENABLE MODE:
1. THE FACTORY PUMP CONTROL SHALL ENABLE THE CHILLED WATER PUMPING SYSTEM WHEN AHU-1 (THE BUFFALO UNIT) IS PROVEN ON.
2. ONCE THE PUMP(S) ARE ENABLED, THE PUMP BYPASS VALVE SEQUENCE SHALL BE THE PRIMARY MEANS OF CONTROLLING DIFFERENTIAL PRESSURE.
3. VERIFY PUMPS ARE RUNNING BY WAY OF PUMP STATUS AND WATER FLOW METER.
4. UPON VERIFICATION THAT PUMP(S) ARE ON AND WATER IS FLOWING, ENABLE THE PUMP CONTROL SEQUENCE.
5. CHILLED WATER PUMPS SHALL BE STAGED UNDER FACTORY CONTROL.
CHILLER CONTROL:
1. IF THE CHILLED WATER SUPPLY TEMPERATURE RISES 4°F ABOVE THE CHILLED WATER SUPPLY SET POINT, THEN THE CHILLER SHALL BE ALLOWED TO OPERATE.
2. ONCE FLOW THROUGH THE CHILLER IS PROVEN BY ITS FLOW SWITCH, THE CHILLER SHALL BE ENERGIZED AND SHALL MAINTAIN THE CHILLED WATER SUPPLY TEMPERATURE AT 43°F (ADJUSTABLE).
3. THE CHILLER CONTROL SEQUENCE WILL BEGIN WHEN CHILLED WATER PUMP HAS A STATUS OF ON. WHEN A CHILLER ENABLE COMMAND IS SENT, THE CHILLER CONTROL VALVE WILL BE FULLY OPENED AND THE CHILLER WILL OPERATE
UNDER FACTORY CONTROL TO MAINTAIN THE CHILLED WATER SUPPLY TEMPERATURE AT A SETPOINT 43°F (ADJ.). THE CHILLERS SAFETIES CIRCUIT WILL BE MONITORED AND THE SYSTEM WILL REPORT A GENERAL ALARM CONDITION IF A SAFETY IS TRIPPED. A MANUAL RESET OF THE CHILLER SAFETY WILL BE REQUIRED BEFORE THE CHILLER CAN BE RESTARTED.
INSULATED FLEXIBLE HOSE
CONNECTION (TYPICAL OF 4)
ROUTE CONDENSATE DRAIN AND EXISTING COOLING COIL DRAIN PAN
DRAIN VALVE
INSULATED FLEXIBLE HOSE
(TYP.)
1. ONCE ENABLED, OPEN THE BYPASS VALVE AND MODULATE THE BUILDING RETURN VALVE TO MAINTAIN DIFFERENTIAL PRESSURE SETPOINT (ADJUSTABLE).
BYPASS VALVE CONTROL:
1. ONCE ENABLED THE PUMP SPEED SHALL BE MODULATED TO MAINTAIN THE DIFFERENTIAL PRESSURE SETPOINT (ADJUSTABLE).
2. FOR HYDRONIC PACKAGES FEATURING MULTIPLE PUMPS:
2.1. SOFTWARE LEAD/LAG FUNCTION SHALL ALLOW EITHER OF THE CHILLED WATER PUMPS TO ACT AS THE LEAD PUMP.
2.2. ALARM ON PUMP FAILURE DETECTED BY CURRENT SENSING SWITCH. UPON FAILURE OF THE LEAD PUMP, THE LAG PUMP SHALL START AUTOMATICALLY.
2.3. PUMP CONTROL SYSTEM SHALL ROTATE LEAD/LAG PUMP BASED ON PUMP RUN TIME. THE PUMP WITH THE LOWEST CALCULATED RUN TIME SHALL ACT AS LEAD PUMP.
3. CHILLED WATER PUMPS SHALL BE STAGED UNDER FACTORY CONTROL.
PUMP CONTROL:
4" Ø
C W
R
4" Ø
C W
R 3"Ø CWR
3"Ø CWR
3"Ø CWS
3"Ø CWS
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CHILLED WATER
SCHEMATIC DIAGRAM
HVAC
PARKER, LAKE HAVASU CITY, AZ
PRJ-STA-SEQ
2022-12-21
DESIGNED
DRAWN
CHECKED
TECH. APPR.
APPROVED
ADMIN APPROVAL -
X
X
X
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