Gree GMV-WQ120WM/A-F, Руководство пользователя

Страница: 56 / 58

Water-cooled Heat Recovery DC Inverter VRF
53
Error Code Content Error Code Content
AU Long-distance emergency stop. nJ
High temperature prevention when
heating.
Ab Emergency stop of operation. nU
Eliminate the long-distance shielding
command of IDU.
Ad Limit operation. nb Bar code inquiry.
An Child lock status. nn
Length modification of connection
pipe of ODU.
For detailed malfunction and maintenance, please refer to the engineering debugging
and after-sales maintenance manual.
8 Maintenance and Care
Regular checking, Maintenance and care should be performed every six months by professional
personnel, which will prolong the unit life span. Disconnect the power supply before cleaning and
maintenance.
8.1 Outdoor Heat Exchanger
After long-term running, accumulation of calcium oxide or other mineral sediments can be found
on the heat transfer surface on the water side of the outdoor unit's heat exchanger. The scale
formation of these minerals may affect the heat transfer performance and lead to higher air discharge
pressure and more electrical energy consumption, as well as chilled water freezing due to reduced
flow. To maintain the outdoor heat exchanger, do as follows:
(1) Check the water system on a regular basis, including water quality inspection, filter cleaning,
confirmation of inlet and outlet water temperature difference and the check of water
pressure.
(2) To clean the outdoor heat exchanger, use 5% dilute phosphoric acid, citric acid or other
weak acid as the detergent. Highly corrosive strong acid cannot be adopted.
(3) Inject the 50~60
℃
(122~140
℉
) detergent in the opposite direction of the normal flow. Set
the flow rate 1.5 times of the normal one and keep the circulation for 2~5 hours.
(4) Discharge the detergent from the outdoor heat exchanger. Then, inject 1~2% sodium
hydroxide or sodium bicarbonate water solution and circulate for 20~30 minutes to
neutralize the acid of the detergent.
(5) After neutralization, use clean water to clean the outdoor heat exchanger.
Fig.8.1.1