(April, 2013)
DRH Series GEN1 Ultrasonic Humidifi er Installation, Operation & Maintenance Manual
3-2
3.4 Precautions
Do not remove the air fi lter at the bottom of the humidifi er during operation.
Do not block the outlet of the mist blow tubes. It could cause a failure if the mist fl ow is reversed.
Drain the water from the water tank for sanitary reasons if the unit is turned off for more than 3 days.
3.5 Steps for Long Term Shutdown
If the humidifi er is not signalled to turn “On” for a period of three days, the level control board will automatically
signal the humidifi er to operate a drain cycle.
When operation is stopped for a long time (one week or longer), the following steps may be performed. Also,
refer to Section 4.1, “Periodic General Maintenance”.
Close the water supply valve.
Drain the water tank.
Turn the main switch on the control box to “Off”.
Check and clean the water tank interior and the air fi lter.
To restart operation after a long-term shutdown, see the previous Section 3-3, “Procedure for Operation”.