14- 230993 sf - sequence of operations for hvac controls.pdf

PDF 17 KB Posted Mar 30, 2010

Attached to: RECOVERYAkron, CO Repair building 1 HVAC system.
Solicitation number: AG-82HW-S-10-0005
Issued by: Department of Agriculture Agricultural Research Service Central Program Planning Coordination and Support

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USDA / ARS

Repair Bldg 1 HVAC System Akron, CO

SEQUENCE OF OPERATIONS FOR HVAC CONTROLS 230993 - Page 1 of 7

SECTION 230993 - SEQUENCE OF OPERATIONS FOR HVAC CONTROLS

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes control sequences for HVAC systems, subsystems, and equipment.

B. See Division 23 Section "Instrumentation and Control for HVAC" for control equipment and devices and for submittal requirements.

1.2 HEATING CONTROL SEQUENCES

A. Heating-Water Supply Temperature Control:

1. Input Device: Thermistor temperature sensor.

2. Output Device: Control valve.

3. Action: Modulate control valve to maintain heating-water supply temperature.

4. Display:

a. Heating-water supply temperature.

b. Heating-water supply temperature set point.

c. Control-valve position.

B. Heating-Water Supply Temperature Reset:

1. Input Device: Outdoor-air sensor.

2. Output Device: DDC system software.

3. Action: Reset heating-water supply temperature in straight-line relationship with outdoor-air temperature as scheduled on M5.02.

4. Display:

a. Outdoor-air temperature.

b. Heating-water supply temperature.

c. Heating-water supply temperature set point.

C. Control Circulating Pump(s):

1. Input Device: DDC system.

2. Output Device: DDC system command to starter relay.

3. Action: Energize pump(s) at outdoor-air temperatures below 65 deg F.

4. Display:

a. Outdoor-air temperature.

b. Operating status of primary circulating pump(s).

SEQUENCE OF OPERATIONS FOR HVAC CONTROLS 230993 - Page 2 of 7

1.3 CENTRAL REFRIGERATION EQUIPMENT SEQUENCES

A. Start and Stop Chilled-Water Pump:

1. Input Device: DDC system.

2. Output Device: DDC system command to starter relay.

3. Action: Energize pump.

4. Display:

a. Chilled-water flow indication.

b. Chilled-water pump on-off status.

c. Chilled-water pump on-off indication.

B. Start and Stop Chiller:

1. Input Device: Flow switches in chilled-water circuit.

2. Output Device: DDC system command to chiller terminal strip.

3. Action: Energize chiller internal control circuit.

4. Display:

a. Chilled-water flow indication.

b. Chiller on-off status.

c. Chiller on-off indication.

d. Chilled-water supply and return temperature.

e. Chilled-water temperature control-point adjustment.

C. Alarm Chiller(s) Start Failure:

1. Input Device: Chiller software signal.

2. Output Device: DDC system alarm.

3. Action: Signal alarm.

4. Display: Chiller "failure-to-start" indication.

D. Chilled-Water Supply Temperature:

1. Input Device: Temperature sensor in common chilled-water supply piping.

2. Output Device: DDC system signal to chiller control panel.

3. Action: Maintain constant leaving chilled-water temperature.

a. Display: Chilled-water supply temperature.

E. Operator Station Display: Indicate the following on operator workstation display terminal:

1. DDC system graphic.

2. DDC system status, on-off.

3. Outdoor-air temperature.

4. Time and time schedule.

5. Chilled-water pump on-off status.

6. Chilled-water supply temperature.

7. Chilled-water return temperature.

SEQUENCE OF OPERATIONS FOR HVAC CONTROLS 230993 - Page 3 of 7

8. Chiller stage.

1.4 AIR-HANDLING-UNIT CONTROL SEQUENCES

A. Start and Stop Supply Fan(s):

1. Enable: Freeze Protection:

a. Input Device: Duct-mounted averaging element thermostat, located before supply fan.

b. Output Device: Hard wired through motor starter; DDC system alarm.

c. Action: Allow start if duct temperature is above 37 deg F; signal alarm if fan fails to start as commanded.

2. Enable: Smoke Control:

a. Input Device: Duct-mounted smoke detector, located in supply air.

b. Output Device: Hard wired through motor starter; DDC system alarm.

c. Action: Allow start if duct is free of products of combustion.

3. Initiate: Occupied Time Schedule:

a. Input Device: DDC system time schedule.

b. Output Device: Binary output to motor starter.

c. Action: Energize fan(s).

4. Initiate: Unoccupied Time Schedule:

a. Input Device: DDC system demand.

b. Output Device Binary output to motor starter.

c. Action: Energize fan(s).

5. Unoccupied Ventilation:

a. Input Device: DDC system time schedule and output.

b. Output Device: DDC system binary output to motor starter.

c. Action: Cycle fan during unoccupied periods.

6. Display: Supply-fan on-off indication.

B. Supply Fan Variable-Volume Control:

1. Occupied Time Schedule:

a. Input Device: DDC system time schedule.

b. Output Device: Binary output.

c. Action: Enable control.

SEQUENCE OF OPERATIONS FOR HVAC CONTROLS 230993 - Page 4 of 7

2. Volume Control:

a. Input Device: Static-pressure transmitter sensing supply-duct static pressure referenced to conditioned-space static pressure.

b. Output Device: DDC system analog output to motor speed controller. Set variable-speed drive to minimum speed when fan is stopped.

c. Action: Maintain constant supply-duct static pressure.

3. Display:

a. Supply-fan-discharge static-pressure indication.

b. Supply-fan-discharge static-pressure set point.

c. Supply-fan airflow rate.

d. Supply-fan speed.

C. Mixed-Air Control:

1. Occupied Time Schedule:

a. Input Device: DDC system time schedule.

b. Output Device: DDC system output.

c. Action: Enable control.

2. Minimum Position:

a. Input Device: DDC system time schedule.

b. Output Device: DDC system analog output to modulating damper actuator(s).

c. Action: Open outdoor-air dampers to minimum position.

3. Heating Reset:

a. Input Device: DDC system software.

b. Output Device: DDC system analog output to modulating damper actuator(s).

c. Action: Set outdoor-air dampers to minimum position.

4. Supply-Air Temperature:

a. Input Device: Duct-mounted thermostat.

b. Output Device: DDC system analog output to modulating damper actuator(s).

c. Action: Modulate outdoor-, and return-air dampers to maintain air temperature set point of 55 deg F.

5. Cooling Reset:

a. Input Device: Outdoor- and return-air, duct-mounted thermostats.

b. Output Device: DDC system analog output to damper actuator(s).

c. Action: Set outdoor-air dampers to minimum position when outdoor-air temperature exceeds return-air temperature.

SEQUENCE OF OPERATIONS FOR HVAC CONTROLS 230993 - Page 5 of 7

6. Unoccupied Time Schedule:

a. Input Device: DDC system time schedule.

b. Output Device: DDC system analog output to modulating damper actuator(s).

c. Action: Position outdoor-air dampers closed and return-air dampers open.

7. Display:

a. Mixed-air-temperature indication.

b. Mixed-air-temperature set point.

c. Mixed-air damper position.

D. Filters: During occupied periods, when fan is running, differential air-pressure transmitters exist.

1. Display:

a. Filter air-pressure-drop indication.

E. Operator Station Display: Indicate the following on operator workstation display terminal:

1. DDC system graphic.

2. DDC system on-off indication.

3. DDC system occupied/unoccupied mode.

4. Outdoor-air-temperature indication.

5. Supply-fan on-off indication.

6. Supply-fan-discharge static-pressure indication.

7. Supply-fan-discharge static-pressure set point.

8. Supply-fan airflow rate.

9. Supply-fan speed.

10. Building static-pressure indication.

11. Building static-pressure set point.

12. Mixed-air-temperature indication.

13. Mixed-air-temperature set point.

14. Mixed-air damper position.

15. Filter air-pressure-drop indication.

16. Fan-discharge air-temperature indication.

17. Fan-discharge air-temperature set point.

18. Room temperature indication.

19. Room temperature set point.

1.5 TERMINAL UNIT OPERATING SEQUENCE

A. Radiators and Convectors, Hydronic:

1. Occupancy:

a. Input Device: Occupancy sensor.

SEQUENCE OF OPERATIONS FOR HVAC CONTROLS 230993 - Page 6 of 7

b. Output Device: DDC system binary output.

c. Action: Report occupancy and enable occupied temperature set point.

2. Room Temperature:

a. Input Device: Room thermostat.

b. Output Device: Electronic control-valve operators.

c. Action: Modulate valve to maintain temperature.

1) Occupied Temperature: 76 deg F.

2) Unoccupied Temperature: 65 deg F.

3. Display:

a. Room/area served.

b. Room temperature indication.

B. VAV, Terminal Air Units with Hydronic Coils:

1. Occupancy:

a. Input Device: Occupancy sensor.

b. Output Device: DDC system binary output.

c. Action: Report occupancy and enable occupied temperature set point.

1) Occupied Temperature: 76 deg F.

2) Unoccupied Temperature: 65 deg F.

2. Room Temperature:

a. Input Device: Room thermostat.

b. Output Device: Electronic damper actuators and control-valve operators.

c. Action: Modulate damper and valve to maintain temperature.

1) Sequence damper from full open to minimum position, then valve from closed to fully open.

3. Display:

a. Room/area served.

b. Room occupied/unoccupied.

c. Room temperature indication.

d. Room temperature set point.

e. Room temperature set point, occupied.

f. Room temperature set point, unoccupied.

g. Air-damper position as percent open.

h. Control-valve position as percent open.

SEQUENCE OF OPERATIONS FOR HVAC CONTROLS 230993 - Page 7 of 7

PART 2 - PRODUCTS (Not Applicable)

PART 3 - EXECUTION (Not Applicable)

END OF SECTION 230993

File details come from the government source that posted it. Updated Nov 14, 2017.