How to change the debugging sequence of air conditioning box from stand-alone unit to system linkage?

When debugging the air-conditioning box, after confirming the installation and start-up conditions, first check the individual equipment and measurement and control points, then verify the relevant interlocks, and finally proceed to the joint adjustment of system air volume, hydraulics, temperature and humidity. The specific sequence should be formed according to the actual configuration, and one successful startup cannot be used to replace all functional debugging.

Every time you enter the next stage, you must have evidence from the previous stage.

In the stand-alone stage, the actions and feedback of the fan, damper and actuator are confirmed; in the point stage, sensor readings and controller displays are checked; in the interlocking stage, start-up, stop and exception handling are verified; in the system stage, performance is adjusted based on the available cold and heat sources and actual air paths. Test exceptions should be handled and retested before continuing to expand the scope of the operation.

It is necessary to confirm that the actual actions, signal definitions and readings of individual machines and points are corresponding correctly; for logic and protection, it is necessary to confirm that the sequence, alarm, failure and recovery conditions are in compliance with the agreement; for system performance, it is necessary to confirm that the air volume, water side and air status meet the corresponding working condition requirements. The three stages correspond to different verification objects and cannot be skipped. For condition checks before starting the machine for the first time, please refer toWhat conditions need to be checked before the air conditioner is turned on for the first time?。

Before debugging a single machine, first confirm that the equipment can operate safely.

Single-machine debugging starts with fans, air valves, water pumps, humidifiers, electric heating and other equipment, and confirms that the start and stop, steering, opening and feedback are normal. Wrong direction of the fan, stuck damper, or incorrect actuator stroke will affect subsequent system debugging. Single machine debugging should also conduct preliminary verification of abnormal conditions, such as emergency stop, overload and fault alarm.

For troubleshooting when the fan is running but there is no obvious air supply, please refer toHow to troubleshoot if the air conditioner fan is running but there is no obvious air supply? . For DC fan drive and speed adjustment matching, please refer toWhat driving conditions need to be matched when using a DC fan in an air-conditioning box? . The normal operation of the stand-alone machine is the prerequisite for entering the point verification.

Point positions and interlocking should be checked point by point

Point verification includes whether sensor readings, actuator feedback, alarm status and controller display are consistent. Measuring points such as supply air temperature, return air temperature and humidity, filter pressure difference and fan status should be compared with the actual situation on site. Interlock verification includes start-stop sequence, anti-freeze protection, electric heating air loss protection and fan failure handling, etc.

For control point table and signal definition, please refer toWhat point tables need to be provided before the air-conditioning box is connected to the building automation system? . Whether the sensor position is reasonable, please refer toHow should the air supply temperature sensor of the air conditioning box avoid the influence of local airflow? . Interlock verification should simulate abnormal conditions rather than just looking at normal displays.

Air volume balance is the basis for system joint debugging

System joint debugging usually starts with air volume balance, checking the total air volume, the air volume of each branch and the room pressure difference. If the air volume balance is not completed, there will be a lack of stable conditions for temperature and humidity debugging and cleanliness testing. The air volume adjustment may involve the fan speed, damper opening and terminal air outlet. After adjustment, the system status should be rechecked.

When the air volume is insufficient, check the measurement first or increase the speed first. Please refer toIf the total air volume of the air conditioning box is insufficient, should I check and measure it first or should I increase the speed first? . For air volume unit conversion, please refer toHow to convert the air volume units of air conditioning box in m³/h, L/s and CFM? . For the relationship between fresh air and total air supply, please refer toHow to calculate the fresh air volume and total air supply volume of the air conditioning box separately?。

Hydraulic and temperature and humidity debugging should be carried out after the air volume has stabilized.

After the air volume is balanced, the water system balance and temperature and humidity debugging are carried out. The cold water flow rate, supply and return water temperature difference, valve adjustment and coil outlet status need to be checked together. Temperature and humidity debugging should be carried out under representative working conditions, covering normal production, low load and seasonal changes.

How to confirm water parameters, please refer toWhat water parameters should be confirmed before connecting the air conditioning box to the cold water system? . How to select the type of surface cooler according to the air inlet and outlet conditions, please refer toHow to select the type of air conditioner cooler according to the air inlet and outlet conditions? . To troubleshoot the supply air temperature that cannot be lowered, please refer toHow to distinguish the reasons between the water side and the air side when the air supply temperature of the air conditioning box cannot be lowered?。

How debugging records support delivery

Each record shall indicate the version, settings, working conditions, test methods and results, and keep a record of problem closure. For projects whose seasonal conditions are not yet available, the test to be completed and subsequent arrangements should be stated. Untested projects cannot be written as passed. After the on-site parameters are finalized, the operation and maintenance data and control backup will be updated simultaneously.

How to list applicable standards in procurement technical documents, please refer toWhat applicable standards should be listed in the technical documents for purchasing air-conditioning boxes? . Verification boundaries for pharmaceutical projects, please refer toHow to define the boundaries of equipment and verification work in the air-conditioning box of pharmaceutical clean workshop? . The debugging record should be able to correspond to the equipment number, date and participants.

Aili industrial supporting equipment

Aili Industrial can cooperate with the equipment and interface verification as agreed; all parties in the project will unify the test list before commissioning, which will help reduce delivery deficiencies in which a single machine is qualified but the system is not closed. Aili's industrial manufacturing end covers independent R&D and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly. Fans, dampers, sensors and control logic can be corresponded in the same set of supporting materials; debugging parameters and alarm records can be retained for non-standard configurations.

Product form can be viewedAir handling unit andFan box page; clean air supply package can be combinedFFU fan filter unit andEFU equipment end fan filter unit verification; multiple equipment linkage can understandMatching method of FFU computer group control system ; terminal particle filtering can be combinedHEPA/ULPA filter confirmation; when it comes to gaseous pollution control, you can communicate separatelyChemical filter solutions. The specific debugging steps, acceptance conditions and delivery scope still need to be verified based on the corresponding configuration data and on-site working conditions. The actual effect is subject to on-site debugging and performance test results.

Submit project parameters:https://ailigy.com/contactus.html

Related questions and answers

The stand-alone debugging is normal. Can I directly enter the system joint debugging?
Not recommended. Point verification and interlocking verification should also be completed to confirm that sensors, actuators and protection logic are normal before entering system joint debugging.

Which should be done first, air volume balancing or temperature and humidity debugging?
Usually, the air volume is balanced first, and then the hydraulic and temperature and humidity debugging is carried out after the air volume is stabilized. Otherwise, the temperature and humidity results lack the prerequisite for stability.

Can Aili Industrial help with debugging?
The equipment and interface can be checked according to the agreement, and the specific debugging is completed by all parties in the project according to the test list.

Related articles

1. What conditions need to be checked before the air conditioner is turned on for the first time?

2. If the total air volume of the air conditioning box is insufficient, should I check and measure it first or should I increase the speed first?

3. What water parameters should be confirmed before connecting the air conditioning box to the cold water system?

4. What point tables need to be provided before the air-conditioning box is connected to the building automation system?

Key points for selection and acceptance inspection