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

Before starting up the air-conditioning box for the first time, it should be confirmed that the mechanical installation, air path, water path, electrical control and protection conditions are in place, and transportation fixtures and construction remnants should be removed. Just because the start button is operable does not mean that the equipment is ready for trial operation. The inspection should be completed and recorded by corresponding professionals according to the confirmation documents.

Confirm readiness one by one according to five links

On the mechanical side, check the status of fixed, supporting and moving parts; on the air side, check filter media, dampers, air ducts and channels; on the water side, check connections, cleaning exhaust and usable conditions; on the electrical side, check power supply, grounding and protection; on the control side, check probes, actuators and necessary interlocks. If a missing item is found during the inspection, the missing item should be closed first and then scheduled to start.

Installation readiness requires that fixing, air ducts, pipes, drainage and construction cleaning be completed; energy readiness requires that power supply and cold and heat sources meet trial operation requirements; protection readiness requires that start and stop, emergency stop, alarm and related interlocking have been checked. The three types of conditions correspond to different majors and cannot be confirmed verbally by one person based on experience. How to change the debugging sequence from stand-alone to system linkage, please refer toHow to change the debugging sequence of air conditioning box from stand-alone unit to system linkage?。

Mechanical and air duct inspection cannot be skipped

If the transportation fasteners, temporary supports and packaging seals are not removed, vibration, abnormal noise or insufficient air volume may occur after the fan is started. The status of fan impellers, belts or direct-coupled structures, shock absorbers and anchor bolts should be confirmed according to the equipment instructions. The air valve opening, filter installation and air duct connection should also be checked to avoid discovering that the passage is blocked after starting.

The transportation protection of the air outlet and pipe joints should be completely removed, please refer toHow should the air vents and pipe joints of air-conditioning boxes be protected before leaving the factory for transportation? . The installation direction and sealing status of the filter must also be confirmed, please refer toHow to configure the primary-efficiency and medium-efficiency filters of air-conditioning boxes in different stages? . The steering and transmission status of the fan should be confirmed by professionals according to the instructions. Opening the door and touching parts should not be done while the fan is powered or rotating.

Waterway inspection should cover connections, venting and drainage

Cold or hot water pipelines should be cleaned, pressure tested and vented, valves and actuators should operate normally, and filters should be installed in place. The water tray, drain outlet and water seal should be checked to see if they are smooth and whether the drainage structure of the negative pressure section is set up as designed. Starting the fan when the water circuit is not ready may result in no water flow in the coil, idling of the water pump, or overflow of the water pan.

How to confirm water parameters, please refer toWhat water parameters should be confirmed before connecting the air conditioning box to the cold water system? . For the slope of the water tray and the layout of the drainage outlet, please refer toHow to combine the slope of the water pan of the air-conditioning box with the layout of the drain outlet? . For the setting of the water seal in the negative pressure section, please refer toWhy does negative pressure drainage of air conditioning boxes often require water sealing?。

Electrical and control checks to cover protection logic

Supply voltage, phase sequence, grounding and protective devices should be confirmed by qualified electrical personnel. The wiring, sensor signals and actuator feedback in the control cabinet should be checked point by point, and interlocks such as start and stop, emergency stop, fan failure, filter pressure difference alarm and anti-freeze protection should be simulated and verified. For units involving electric heating, the conditions for wind loss protection and over-temperature protection should also be confirmed.

To check the control point table and communication interface, 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? . For DC fan driving conditions, please refer toWhat driving conditions need to be matched when using a DC fan in an air-conditioning box?。

How to form a traceable boot record

Record the equipment number, date, participants and each conclusion, and separate 'not applicable' from 'not yet completed'. Before loading, it is necessary to confirm the allowable conditions item by item according to the actual configuration. Inspections involving electrical or rotating parts should be carried out in accordance with isolation and professional operation requirements. Do not enter the hazardous area to handle leftovers while the equipment is running.

The startup record should be able to correspond to the specific checklist and equipment number to facilitate subsequent debugging and problem tracing. If any missing items are found during the inspection, the person responsible and the planned closing time should be recorded rather than agreed verbally. Air volume balance and performance testing should be performed in sequence after conditions are confirmed.

Aili industrial supporting equipment

Aili Industrial can provide equipment information and matching interface verification according to the agreed scope. The on-site team should use the same version of the checklist before starting the machine. Aili Industrial can match fans, motors, filters, waterways, sheet metal and control configurations in the delivery materials; the manufacturing end covers independent research and development and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly. Pre-start inspection items and equipment configurations can be aligned in the same set of data.

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; terminal particle filtration can be combinedHEPA/ULPA filter confirmation; when it comes to gaseous pollution control, you can communicate separatelyChemical filter solutions. The specific inspection content, applicable 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

If the control screen can be operated, can it be turned on?
Doesn't mean. It is also necessary to confirm the mechanical, air duct, water duct, electrical and protective conditions, and the operable control screen is only one of them.

If a missing item is found before starting the computer, should I start it first and then fill it in?
Not recommended. Missing items should be shut down first before starting, especially items related to protection interlocks, waterways and rotating parts.

Can Aili Industrial provide pre-start inspection information?
Equipment data and interface verification support can be provided according to the agreed scope. The specific checklist needs to be compiled based on the project configuration and on-site conditions.

Related articles

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

2. How should the air vents and pipe joints of air-conditioning boxes be protected before leaving the factory for transportation?

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