What operating status should be recorded during daily inspection of air-conditioning boxes?

Daily inspections of air-conditioning boxes should record the operating mode, fan status, key temperature and humidity, filter pressure difference, condensate discharge, alarms and abnormal sound and vibration, and indicate the time and load. The purpose of recording is not just to fill in the form, but to allow data on different dates to be compared under the same or similar working conditions.

Put status, value, and exception on the same line

If you only copy the temperature, you will lose the control background. If you only check 'Normal', it will be difficult to observe the slow changes. It is recommended to save the set value, actual measured value, fan speed or air volume status at the same time, as well as whether there is a production switch or filter material replacement this time. For items that cannot be directly confirmed on site, the data source should be marked to avoid taking instructions as actual status.

The operating background should include the mode, time period, production load and outdoor conditions; the key readings should include temperature and humidity, filter pressure difference, fan and waterway related status; the abnormal records should include water leakage, noise, vibration, alarms and processing results. Only by combining the three types of information can it be determined whether a certain reading change is caused by working conditions or equipment abnormalities. What conditions need to be checked before the air-conditioning box is turned on for the first time? Please refer toWhat conditions need to be checked before the air conditioner is turned on for the first time?。

Operating mode and load are the context for readings

The same supply air temperature has different meanings under low load and full load; the same filter pressure difference also has different meanings under new filter material and at the later stage of dust accumulation. If the inspection records do not indicate the current operating mode, fan frequency, valve opening and production status, it will be difficult to determine the trend in the future. It is recommended to set the operation mode column in the record header and indicate the shift or production status.

Changes in the proportion of fresh return air will affect temperature, humidity and filter load. Please refer toHow is the proportion of new return air to the air-conditioning box determined by project requirements? . The load of the circulating unit changes with production, please refer toWhat indoor loads should the circulating air handling unit be selected based on? . This background information can help explain fluctuations in inspection readings.

The filtration pressure difference should be recorded in stages

The pressure differences of primary, medium and high-efficiency filters should be recorded separately, not just one total pressure difference. The pressure difference ranges and alarm values ​​of different stages are different. Only one total pressure difference is set. When the initial effect is blocked but the medium effect is acceptable, it is difficult for maintenance personnel to judge which stage to change. The pressure difference record should also indicate the date of filter material replacement and the current air volume status.

How to configure filter classification, please refer toHow to configure the primary-efficiency and medium-efficiency filters of air-conditioning boxes in different stages? . Whether the high-efficiency filter is placed inside the machine or at the end will affect the pressure difference measuring point. Please refer toShould the high-efficiency filter of the air-conditioning box be placed inside the machine or at the end of the air supply? . How to select the filter level according to the inlet air conditions, please refer toHow to select the air conditioning box filter grade based on the inlet air conditions?。

Temperature, humidity and waterway status should correspond to the measuring points

The temperature and humidity of supply air, return air and key areas should be recorded separately, and the location of the measuring points should be noted. In terms of water channels, the temperature of supply and return water, valve opening, water pump status, and drain pan drainage conditions can be recorded. If the unit has a humidification section, the status of the humidification valve or humidifier should also be recorded.

Check whether the position of the supply air temperature sensor is reasonable. Please refer toHow should the air supply temperature sensor of the air conditioning box avoid the influence of local airflow? . Check whether the water tray and drainage are smooth. Please refer toHow to combine the slope of the water pan of the air-conditioning box with the layout of the drain outlet? . When draining water in the negative pressure section, you should also pay attention to the water seal status. Please refer toWhy does negative pressure drainage of air conditioning boxes often require water sealing?。

Abnormal sound vibrations and alarms must be recorded and processed.

Abnormal noise in the fan bearings, belt slippage, impeller dust accumulation, shock absorber displacement and cabinet resonance may all be manifested through sound and vibration. If an abnormality is found during inspection, the location, time and working conditions at that time should be recorded, and whether it has been handled, who handled it, and the results of the review should be noted. The alarm record cannot just write 'reset', but must explain the trigger reason.

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? . To troubleshoot insufficient total air volume, please refer toIf the total air volume of the air conditioning box is insufficient, should you check and measure it first or increase the speed first? . For the relationship between abnormal sound vibration and the working point of the fan, please refer toWhy should we check the efficiency range when selecting air-conditioning box fans?。

Let inspection data be truly used for maintenance

When comparing trends, first eliminate differences in operating conditions and then observe continued shifts in differential pressure, temperature, or power. Exceptions should be documented when they were discovered, who handled them, and review results. Data after maintenance should also be retained to confirm whether the status has been restored. Inspection observations are not a substitute for scheduled professional inspections or necessary measurements.

How to determine the maintenance cycle according to the operating environment, please refer toHow to determine the maintenance cycle of air conditioning box according to the operating environment? . The focus of inspections after old equipment has been renovated may change. Please refer toHow to judge whether the retained box is suitable before rebuilding the old air-conditioning box? . For control point table and alarm definition, please refer toWhat point tables need to be provided before the air-conditioning box is connected to the building automation system?。

Aili industrial supporting equipment

Aili Industrial can help clarify the readable status items according to the actual configuration of the equipment, and the user can establish continuous records, which is helpful for after-sales communication and component maintenance judgment. 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, filtration, waterways and control status can be corresponded in the same set of delivery materials; non-standard configurations can retain measurement points and alarm records to facilitate subsequent maintenance.

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 solution; multiple devices can be linked together to understandFFU computer group control system . Supporting method of The specific record items, alarm definitions and delivery scope still need to be verified based on the corresponding configuration data and on-site working conditions. Actual results are subject to on-site inspection records and maintenance results.

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Related questions and answers

Is it okay to only record temperature and humidity during inspection?
not enough. The operating mode, fan status, filter pressure difference, condensate discharge, alarm and abnormal sound and vibration should also be recorded, and the time and load should be noted.

Is it okay to only record a total value for the filtration pressure difference?
Not recommended. Only by recording the initial effect, medium effect and high effect separately can we judge which level needs to be replaced.

Can Aili Industrial help develop an inspection record sheet?
The readable status items can be sorted out based on the equipment configuration and control point table. The specific record table needs to be confirmed according to the project maintenance requirements.

Related articles

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

2. How to determine the maintenance cycle of air conditioning box according to the operating environment?

3. How to configure the primary-efficiency and medium-efficiency filters of air-conditioning boxes in different stages?

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