Ventilation and air conditioning system commissioning
First, the purpose of debugging and preparation instructions
Air conditioning commissioning is to debug each equipment, check the operation of the system, further debug the operation status and control status of the equipment in each area, and check the air pressure, air volume and cooling capacity of the air conditioning and smoke exhaust system in each area to verify whether the design working conditions are met.
Second, the debugging content
After the installation of the air-conditioning and refrigeration system is completed and the pressure test is qualified, the necessary cleaning should be carried out, and the trial operation can be carried out after the completion of the measurement
1. Pumps, fans, air-conditioning units, refrigeration units, cooling towers, fan coils and other equipment need to be tested one by one, and their technical performance parameters will be assessed during the trial operation.
2. Measure the air volume and wind pressure of various types of fans and air conditioning units. Adjust the distribution of air volume in each system, and after adjustment, fix all damper handles and paint them for labeling.
3. Debugging in hot and cold states.
1) Assess and test heaters, coolers, water spray chambers, humidifiers, heat exchangers, refrigerators, etc.
The capabilities of the device.
2) Test operation according to different design conditions, adjust to the design parameters.
3) Measure and adjust the temperature and humidity in the room to meet the design specifications.
3. Debugging process procedures and contents
Debugging process: (1) Debugging process:
Inspection before operation and commissioning of ventilation and air-conditioning system, inspection of control circuit of air-conditioning automatic regulation system, air volume test and adjustment of ventilation and air-conditioning system, performance verification of regulator and testing instrument, performance verification of chiller, load test operation and commissioning of chiller, linkage verification of automatic adjustment system and testing instrument, comprehensive effect measurement of air-conditioning system, data collation, preparation of handover commissioning report.
Stand-alone test run test of air conditioning water pump.
Chiller stand-alone test test.
Chilled water pipe flushing.
Stand-alone test run test of air handler.
Stand-alone wind turbine test test.
Airflow balancing and commissioning of individual duct systems.
Commissioning of air conditioning system.
Regional wind pressure test.
Fourth, the important inspection items before the commissioning of the air conditioning system
l. Complete the installation of the complete functions that should be had.
2. Electrical and control systems.
1) The power supply is normal;
2) The electrical control system has been tested for simulated action;
3) Grounding and insulation have been tested and qualified.
3. There is no follow-up process that affects the debugging results in related projects.
1) There is a debugging site, and the debugging safety facilities have been improved.
2) The water and power supply have been connected to the system to be commissioned.
3) Smooth drainage.
4. Before the commissioning of each single equipment, conduct a comprehensive inspection of each computer room.
1) Clean the debris in the machine room, and thoroughly inspect and clean up the mechanical parts.
2) Clean the oil stain of mechanical equipment, and check whether the lubrication of the equipment is in a good lubricated state.
3) Manual cranking, the mechanical rotation part must be flexible, no jamming blockage, and the rotation condition is good.
4) Check the coupling of the motor and the machine to confirm that the concentricity meets the requirements and there is no collision.
5) Check and confirm that the equipment, base and connection with the foundation are correct, there is no loosening, and the vibration damping accessories are not shifted.
5. Automatic control and adjustment system.
1) The installation and wiring of sensitive components, regulators, regulating actuators, etc., are completed and have the conditions for commissioning;
2) The performance of the automatic adjustment device has reached the requirements;
3) The automatic adjustment system has been tested for simulated action.
6. The equipment and all testing instruments (the following table, not limited to) for debugging are ready and are within the effective verification cycle.
2. Equipment performance measurement and adjustment (stand-alone test operation).
1. Commissioning of cooling water tower
1) Prepare the process.
a) Clean the inclusions and dirt in the cooling tower to prevent blockage of the cooling water pipes or condensers, etc.;
b) The cooling tower and cooling water pipeline system should be flushed with water, and the pipeline system should be free of water leakage;
c) Check whether the action status of the automatic water replenishment valve is flexible and accurate;
d) The water level of the make-up water and overflow water in the cooling tower should be verified;
e) The speed of the rotary distributor of the counter-flow cooling tower should be adjusted to the appropriate amount of water entering the tower, so that the water spray and water absorption can reach a balanced state;
f) Determine the motor insulation of the fan and the direction of rotation of the fan;
2) Cooling tower operation.
When the cooling tower is running, the operation status of the fan and the working status of the cooling water circulation system should be checked, and the operating conditions and relevant data should be recorded; If there is no abnormal phenomenon, the continuous operation time should not be less than 2 hours.
a) Check whether the amount of water sprayed and absorbed is balanced, and the operation of the water level of the make-up water and the water collection tank;
b) Measure the motor starting current and running current value of the fan;
c) Check the causes of vibration and noise generated by the cooling tower;
d) Measure the temperature of the bearing;
e) Check the bias flow status of the water spray;
f) The temperature of the cooling water at the inlet and outlet of the cooling tower.
During the trial operation of the cooling tower, the sediment and dust remaining in the pipeline and brought in with the air will be deposited at the bottom of the sump, so the sump should be cleaned after the trial rotation is completed.
If the cooling tower is not used for a long time after the trial operation, all the water in the circulating pipeline and the collection tank should be released to prevent the equipment from freezing and breaking.
2. Debugging of water pump
1) Mechanical inspection.
a) Check whether the installation model is correct;
b) Clean the surroundings of the pump unit and ensure that there are no obstructions;
c) Check whether the fluid direction of the pump is correct;
d) Check that the pump body screws and pump fixing screws must be firmly connected;
e) The impeller must be rotated normally by hand;
f) The concentricity of the pump and the motor coupling should be corrected;
g) Check whether the level of the shock absorber is up to specification and ensure free rocking;
2) Electrical part inspection.
a) Check whether the motor installation model is correct;
b) Check whether the starting relay and current overload model are correct;
c) Check whether the model and current of the main circuit breaker meet the requirements of the motor at full load;
d) whether the starting disc inlet and outlet wiring is correct;
e) Check the control loop;
f) Check that all the screws are secure;
g) Clean all garbage inside and outside the starting plate;
h) The motor and the inlet and outlet wiring shall be insulated and tested and meet the specifications;
i) Check the power supply control loop and determine that the starting procedure is correct;
j) Emergency stop control must be correct and good.
3) Commissioning and setting.
a) Check that the pump inlet and outlet valve switch is smooth and normal;
b) The inlet and outlet pressures reach normal;
c) Close the outlet valve and measure the power supply voltage to normal;
d) Start the pump and check that the pump is turned correctly;
e) Slowly open the outlet valve to reach the design pump pressure;
f) Check the shock absorber, vibration and noise of the pump;
g) Check the phase current and balance of the pump motor;
h) Restart the pump and adjust the relay conversion time (except direct start);
i) Re-review the pump pressure and procedures;
j) Adjust the current overload protector to 105%-110% of the operating current;
k) Record all data.
3. Debugging of air conditioning processor
1) Inspection of mechanical parts.
a) Check whether the installation model is correct;
b) Remove the garbage inside and outside the air-conditioning machine and ensure that there are no obstructions;
c) Check that all duct valves are working properly and in the correct position;
d) The use of hand to turn the pulley must be smooth and normal;
e) Adjust the concentricity of the fan motor pulley;
f) Make sure the pulleys are securely installed;
g) Check and adjust the belt tightness;
h) Adjust and check the level of the shock absorber to meet the specification and ensure free rocking;
i) Check that the filter is properly installed and cleaned;
j) Check that the condensate tray drains properly;
k) Check that all water pipes are properly connected;
l) Check that all water valves are in good order;
m) Check that all valve switches are in the correct position.
2) Electrical part inspection.
a) Check whether the motor installation model is correct;
b) Check whether the starting relay and current overload model are correct;
c) Check the model and current of the main circuit breaker to meet the full load requirements of the motor;
d) Check whether the starting disc inlet and outlet wiring is correct;
e) Check the control loop;
f) Check that all the screws are secure;
g) Clean all garbage inside and outside the starting plate;
h) Insulation test of motor and inlet and outlet wiring;
i) Power supply control loop, determine the correct starting procedure;
j) Emergency stop control must be correct and good.
3) Trial rotation and setting.
a) Check and measure the supply voltage;
b) Start the air conditioner and check that the steering is correct;
c) Measure and adjust fan speed, air volume and fan pressure;
d) Check that all wind control valves are working properly;
e) Restart the air conditioner and adjust the relay switching time (except direct start);
f) Check the vibration and noise of the shock absorber and pump of the air conditioner;
g) Check the phase current and balance of the air conditioner motor;
h) Adjust the current overload protector to 105%-110% of the operating current;
i) Check and the cold water pressure is normal;
j) Check and adjust the temperature control program to function normally;
k) Check that all control valves are in order;
l) Check the temperature and humidity of the inlet and outlet air;
m) Record all data.
4. Ventilator commissioning
1) Inspection of mechanical parts.
a) Check whether the installation model is correct;
b) Clean up the garbage inside and outside the fan and ensure that there are no obstructions;
c) Check that all duct valves are working properly and in the correct position;
d) The use of hand rotation of the impeller must be smooth and normal;
e) Adjust the concentricity of the fan motor pulley;
f) Make sure the pulleys are securely installed;
g) Check and adjust the belt tightness;
h) Adjust and check the level of the shock absorber to meet the specification and ensure free rocking;
2) Electrical part inspection.
a) Check whether the motor installation model is correct;
b) Check whether the starting relay and overload model are correct;
c) Check whether the model and current of the main circuit breaker meet the full load needs of the motor;
d) Check whether the starting disc inlet and outlet wiring is correct;
e) Check the control loop;
f) Check that all the wiring screws are secure;
g) Clean all garbage inside and outside the starting plate;
h) Insulation test of motor and inlet and outlet wiring;
i) Check the power supply control loop and determine that the starting procedure is correct;
j) Emergency stop control must be correct and good.
3) Commissioning and setting.
a) Check and measure the power supply voltage to normal;
b) Start the fan and check that the steering is correct;
c) Measure and adjust fan speed, air volume and fan pressure;
d) Check that all wind control valves are working properly;
e) Restart the fan and adjust the relay conversion time (except for direct start);
f) Check the shock absorber, vibration and noise of the fan;
g) Check the phase, electrical appliances and balance of the fan motor;
h) Adjust the current overload protector to 105%-110% of the operating current;
i) Record all data.
5. Fan coil unit commissioning
1. Check whether the installation model is correct;
2. Check that the pipeline is installed correctly;
3. Check that the wiring must be correct;
4. Clean up the garbage inside and outside the coil fan and ensure that there are no obstructions;
5. Check that the filter screen is properly installed;
6. Check that the condensate tray drains normally;
7. Check the insulation to ensure that there is no damage;
8. The use of hand rotation of the impeller must be smooth and normal;
9. Check and measure the power supply voltage to reach normal;
10. Check the fast, medium and slow speed control of strain gear;
11. Check the vibration and noise of the coil fan;
12. Check the normal function of the control valve and the corresponding control temperature switch;
13. Check the operating current;
14. Detect the temperature of the inlet and outlet air;
15. Record all data.
6. Commissioning of centrifugal refrigeration unit;
1. Centrifugal refrigeration unit;
2. Vacuum test;
3. Whether the water flow switch is correctly linked;
4. The inlet and outlet pressure reaches normal;
5. Check the inlet and outlet valves and electric valve switches to achieve smooth and normal;
6. Check the control loop;
7. The motor and the inlet and outlet wiring shall be tested for insulation and meet the specifications;
8. Full load test;
9. According to the debugging requirements of the refrigerator manufacturer;
4. Measurement and adjustment of air volume of air conditioning system
1. According to the actual situation of the project, draw a single-line perspective view of the system, and indicate the size of the air duct, the cross-sectional position of the measurement point, the position of the sending (returning) tuyere, and indicate the design air volume, wind speed, cross-sectional area and the outer frame area of the tuyere;
2. Before turning on the fan, put the adjusting valve of the air duct and the wind product itself in the fully open position, put the three-energy adjusting valve in the middle position, and the various adjusting doors in the air handling room should also be placed in the actual operating position.
3. When the fan is turned on, the air volume is measured and adjusted, and the total air volume is roughly measured to meet the design air volume requirements.
4. Check the fire damper on all branch pipes, and the air control valve and electric control valve must be fully opened;
5. All tuyeres are adjusted to vertical blades;
6. Turn on the fan to measure the air volume of each tuyere, and the air volume test of the tuyere can be used to measure the average wind speed and calculate the air volume. The number of tests should not be less than 3-5 times for different points.
7. Calculate the lowest point of the measurement ratio according to the design value, and set the proportion value of this parameter point to 1;
8. Adjust other values greater than the proportion to 1, in the process of adjustment, constantly measure the proportional value of the parameter point, when the value is not 1, the value of the main air volume must be kept at 1;
5. Linkage calibration of dynamic adjustment system and testing instruments
1. Familiar with the automatic control drawings and clear control scheme;
2. Check whether the on-site controller and control components are installed correctly;
3. Check whether the control components such as water valves, dampers, and sensors are wired correctly with the on-site controller;
4. Test whether the control components such as water valves, dampers, and sensors function normally;
5. Test whether the on-site controller realizes the automatic control function;
6. After the equipment has the function of use and is normally turned on after the test, the system needs to be jointly calibrated to detect whether each control element can be automatically adjusted according to the parameters set by the controller, and whether the parameters of each air conditioning area meet the design requirements with the instrument.
Sixth, the system commissioning and commissioning:
The system linkage test run should be carried out after the stand-alone test operation of ventilation and air conditioning equipment and the measurement of air leakage volume of the air duct system are qualified. During the system linkage test operation, the linkage of equipment and main components must be coordinated, the action is correct, and there is no abnormal phenomenon.
The measurement and commissioning of the non-production load of the air conditioning system shall include the following:
Determination of air volume, residual pressure and fan speed of air conditioning equipment;
Measurement and adjustment of air volume of the system and tuyere. The deviation of the actual measurement design should not be greater than 10%;
Determination of air conditioner noise;
The pressure, temperature, flow rate and other technical data of the refrigeration system operation shall comply with the provisions of the relevant technical documents;
The noise measurement of fan coil unit shall be carried out in accordance with the current national standard "Engineering Law for Determining the Noise Power Level of Heating, Ventilation and Air Conditioning Equipment".
Measurement and adjustment of comprehensive efficacy:
The measurement and adjustment of the comprehensive efficiency test of the system should be determined by the construction unit according to the nature of the project and the requirements of process design.
The acceptance of the air-conditioning project is divided into two stages: completion acceptance and comprehensive efficiency test. The completion acceptance is mainly the inspection and evaluation of the construction quality of the project; The comprehensive performance test is the inspection and evaluation of the construction quality of the project; The comprehensive performance test is the detection and evaluation of the use function of the project.
7. Completion acceptance:
The handover and acceptance of the air-conditioning project shall be handed over to the construction unit by the construction unit or the general contractor to the construction unit with qualified quality;
The comprehensive efficiency test of the delivery and acceptance of the air-conditioning project shall be carried out by the construction unit, and the design and construction unit shall cooperate. The test of comprehensive efficiency should be carried out after the completion and acceptance of the project and under the condition that the production trial operation has been carried out;
The indicators of the comprehensive efficacy test project should meet the design requirements.