(April, 2013)
DRH Series GEN1 Ultrasonic Humidifi er Installation, Operation & Maintenance Manual
3-1
3.0
OPERATION
3.1 Purge the Water Line
Before operating the unit, metal shavings or debris that may form during the installation process must be
fl ushed from the water supply piping. Perform the following steps before allowing water to fl ow into the
humidifi er:
1. Ensure the main disconnect switch from the control box is set to “Off” for safety.
2. With the water supply valve closed, disconnect the supply tubing from the fi lter strainer in the side of the unit.
3. Open the supply valve and fl ush the tubing into a bucket or building drain for about 30 seconds.
4. After the water line is purged, close the valve and reconnect the supply line to the inlet fi lter/strainer.
3.2 Initial Operation Checklist
For new installations, ensure the unit is ready to operate by going through the following checklist prior to start-up:
1. The humidifi er is installed horizontally and level.
2. No obstacle is within 15 feet in front of the atomizing direction.
3. The electrical wiring is correctly connected.
4. De-ionized or reverse osmosis water supply is used.
5. The water supply piping and overfl ow piping are correctly connected and secured.
6. All parts are correctly installed.
After the above items are checked, operation may begin.
3.3 Procedure for Operation
1. Turn the main power source switch on the control box to the “On” position.
2. Open the water supply valve allowing water to fl ow to the humidifi er.
3. Perform a manual drain cycle to fl ush any particulates from the tank utilizing the system controller (see
STULZ Ultra-Series controller IOM manual #OUU0078, Section 5.5.1.2).
4. Set the humidity setpoint to the desired humidity level.
5. When power is supplied to the humidifi er and there is a demand for humidifi cation, water fl ows into the unit.
When the water in the tank reaches the required level, the ultrasonic nebulizers will start producing mist.
6. If the unit does not start operating, increase the humidity setpoint to create a demand for humidifi cation.
7. During operation, the humidifi er starts and stops by means of a signal from the control box.
8. The water level in the water tank is maintained by the level controller.
9. If the water level in the tank falls below the safety level for any reason during operation, power to the
ultrasonic nebulizers is cut off by the level controller.
After operation is started, check the following items on a regular basis:
Atomized mist is visible through all the mist blow tubes.
Check the humidifi er parts, overfl ow pipe and other piping for signs of leaking water.
Change the humidity setpoint to ensure the control box is interconnected properly and that it controls the
operation of the humidifi er.
Check to see that the mist diffusion is good and that objects in the room or any obstacle are not directly
exposed to the mist.