Mainly by providing installation drawings to assist the installation. If necessary, engineers can be sent for field assistance.
The necessary setup will be completed before shipping. Other issues are usually resolved by remote assistance (Teamviewer or QQ)
Within warranty, if there is any quality problem with the products, all repair and component replacement are free. For acute quality problems, can sent engineers for on-site solving, or product return to factory to repair or whole order replacement.
After warranty, repair keeps free,while the cost of the components shall be asked for replacement. And engineers-on-site-solving is also available.