... Close the external circuit breaker .(2) Close the master switch,at this point ,power light on power box is ... Front of power box (3)Turn on UV light switch .About 3mins later ,UV light will reach best ... goods surface . Power off (1)turn off UV lamp switch,now UV light will be off.(2)when the ... temperature in UV lamp case reduces (about below 50degree),turn off the main switch.(3)turn off power ...