Dehumidifier inspection technical specifications: types, parameters, requirements and test methods

Dehumidifiers are electrical devices that condense moisture in the air through compressor refrigeration or semiconductor refrigeration technology. They are used to regulate environmental humidity and prevent mold growth and moisture in items. Its core categories include:

• According to return air temperature : Type A (18℃~35℃), Type B (5℃~35℃)

• By purpose : Comfort type (S type, home/commercial), Craft type (G type, industrial)

• According to condensation method : air-cooled, water-cooled, combined

• By function : heating type, cooling type, temperature regulating type

• By structure : integral type, split type

• According to the air supply method : direct blowing type, duct type

• Adjustment by capacity : Fixed-volume models (refer to GB/T17758-2023) and non-fixed-volume models must reflect the nominal dehumidification capacity (unit: kg/h), and the basic parameters must meet the ambient temperature requirements.

1. Technical requirements

1. General requirements

   • The refrigeration system complies with GB/T9237, and the components are installed firmly without friction or collision.

   • The materials are environmentally friendly and recyclable, the insulation layer is non-toxic, odorless, flame retardant and condensation-free during operation.

   • The water full protection device is reliable and the harmful substance content complies with GB/T26572.

2. Appearance

   • Metal parts are rust-proofed; electroplated parts are smooth without peeling or pinholes; painted parts are even without bubbles or flow marks; plastic parts are flat without cracks or shrinkage holes.

3. Performance Testing

   • Trial operation : No abnormality, protection device does not malfunction, temperature and humidity are accurately controlled.

   • Sealing : No leakage in the refrigeration system (for models ≤10kg/h, use a 1×10⁻⁶ Pa·m³/s leak detector; for models >10kg/h, use a 1×10⁻⁵ Pa·m³/s leak detector).

   • Dehumidification performance :

     • Nominal operating conditions: Dehumidification capacity ≥ 95% of the indicated value, power consumption ≤ 110% of the indicated value, dehumidification capacity per unit power consumption ≥ 95% and ≥ the limit values in Table 3.

     • High temperature conditions: dehumidification capacity ≥ 95%, power consumption ≤ 110%.

   • Extreme working conditions :

     • Maximum load operation (90%/110% voltage): The overload protector will not trip in the first hour. It is allowed to trip within 5 minutes in the second hour, but it must run continuously for 1 hour after resetting.

     • Low-temperature dehumidification: no water dripping/leakage, no frost on the sensor, no ice on the evaporator, and defrost time ≤ 30% of the total time.

   • Condensation drainage : no water overflows from the drain outlet, no condensation drips from the outer surface, and no condensation water accumulates on live parts.

4. Security Requirements

   • Protection : The structure is anti-electric shock (GB/T16842 probe test), the moving parts have a solid protective cover, and the outdoor part is waterproof ≥IPX4 (GB/T4208).

   • Electrical Safety :

     • The leakage current is ≤2mA/kW and is divided into three categories of limits (public accessible ≤10mA, inaccessible ≤30mA, portable ≤0.75mA).

     • Electric strength: no breakdown (test voltage: 1000V + 2 times rated voltage).

     • Grounding resistance ≤ 0.1Ω (≤ 10kg/h model), and the grounding circuit continuity is good (voltage drop ≤ the limit in Table 4).

   • Electromagnetic compatibility :

     • Models ≤10kg/h: Terminal disturbance/radiated disturbance complies with GB4343.1; >10kg/h as per agreement.

     • Harmonic current: ≤16A/phase in accordance with GB17625.1; >16A/phase in accordance with GB/T17625.8.

     • The immunity level complies with GB/T4343.2 (Class II appliances).

5. Other special projects

   • Noise : Sound pressure level ≤ the limit in Table 5 and ≤ the indicated value + 3dB(A) (Appendix B test).

   • Standby power :

     • ≤2.5kg/h: Without communication function ≤3W; With communication function ≤ indicated value.

     • ＞2.5kg/h：≤indicated value

   • Caster performance (only for wheeled models):

     • Shock resistance: ≤30kg drop 30cm; 30-60kg drop 20cm (free fall 2 times without damage).

     • Braking: Locks the castor to prevent it from rolling under a thrust of 50N.

     • Dynamic load: 1000 cycles through obstacles (filled with water) without any sticking or abnormal noise.

   • Weather resistance :

     • Salt spray test: rust spots on the coating ≤ 1mm²/100cm² (no rust spots within 100cm²).

     • Coating adhesion ≥ Level 2 of GB/T9286-2021.

     • The aging of outdoor unit plastic parts complies with JB/T10359-2013.

   • Additional features :

     • Purification: Clean air volume ≥ 90% of the indicated value.

     • Sterilization: Sterilization rate ≥ 90% of the stated value.

2. Test methods

1. General conditions

   • The voltage deviation is ±2%, the frequency deviation is ±1%, and the instrument accuracy complies with Table 6 (such as temperature ±0.5℃).

   • Turn off non-declared auxiliary functions (purification/sterilization), test the maximum wind speed, and set the temperature and humidity according to the manufacturer's settings (if not specified, use the lowest value).

2. Installation specifications

   • Split connecting pipe: 5.0m for ≤10kg/h; 7.5m for >10kg/h (the manufacturer's length may be longer based on actual requirements, outdoor section ≥3m).

   • During the dehumidification test, close the ventilation door and adjust to the maximum dehumidification state.

3. Key test processes

   • Overflow insulation : block the drain hole → short-circuit the water full protection → run with overflow for 1 hour → measure the insulation resistance (≥2MΩ).

   • Limit heat exchange : block the condenser fan → trigger protection → restart and run for 1 hour.

   • Power failure : Power off for 5 seconds during operation → restart → run for 1 hour.

   • Safety Testing :

     • Protection against electric shock: Type B probe (20N force) touches live parts.

     • Protection of moving parts: 0.5J impact shield + 5N force probe test.

   • Standby power : 23±5℃ environment, measure the average power after 1h of standby.

Note : Some tests (such as dynamic load) are not applicable to process dehumidifiers (G type); all data processing must be corrected for fan power according to GB/T17758 (when the static pressure of air outlet ≠ 0Pa).

Summary : Through the above comprehensive inspection, it is ensured that the dehumidifier meets the standards in terms of materials, process, performance (dehumidification efficiency, stability under extreme working conditions), safety (electrical, structural protection) and special functions (purification/sterilization), thus ensuring user safety and product reliability.