Stulz ENS Series - User Manual

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STULZ UltraSonic

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



ENS 14 A ENS 18 A

Original instructions

- Read carefully before use -

- Keep for later reference -

Index 1000720 EN

Issue 08.2016

Main Page

Questions and Answers

B
Bobby CoxAug 18, 2025
Why is water escaping from the overflow of my Stulz Humidifier?
- H
  Heidi MorrowAug 18, 2025
  Water may escape from the overflow of your Stulz Humidifier for a couple of reasons: * The water supply float switch FS1 should close the supply valve when the maximum water level is reached. If the valve is open (e.g. clogging, mechanical fault), water is fed to the humidifier continuously. * If the drain is blocked, the flush valve is closed, or the unit is not correctly installed, water may escape from the overflow.
M
Michael CooperNov 1, 2025
What to do if my Stulz Humidifier has no mist production?
- C
  Carolyn CruzNov 1, 2025
  If your Stulz Humidifier isn't producing mist, there are several things you can check: * Start up the unit and check the function of the control system. * Ensure the unit is getting electrical power. * Verify the control system parameters and reset if necessary, in case enabling or flush function is active, or the setpoint was reached. * Check the drinking water supply, fill valve, and drain to ensure a sufficient water supply. * Check float switches FS1 and FS2, and voltage to motherboard (CH) slot CN1 contact 1/2 and slot CN2 contact 5. * Check electrical supply H1/G1 and H2/G2. * Check the transformer. * Ensure the unit is installed correctly as described in the "Humidifier distance" section. * Check operating hours and visually inspect oscillators. * Check setpoint...

Summary

STULZ UltraSonic Humidifier Technical Manual

2. Safety

2.1. Proper use

Defines intended application and prohibitions.

2.2. Basic safety instructions

General safety precautions for operation and maintenance.

2.3. Qualification requirements for personnel

Specifies required qualifications for personnel.

4. Product description

4.3. Description of unit

Components and how the unit works.

4.5. Technical data

Key specifications and performance data.

4.7. Application limits

Operating conditions and material compatibility.

4.9. Water treatment

Requirements for water quality and treatment.

6. Open-loop and closed loop control

6.1. Master;slave control cabinet

Details on the control cabinet and its functions.

7. Installation

7.1. Installation diagram

Visual layout of connections and components.

7.2. Installation clearances

Required space around the unit for access.

7.3. In-duct installation

Procedures for mounting within air ducts.

7.4. Connecting water supply lines

Procedures for connecting water supply.

7.5. Electrical connection

How to connect power and wiring.

8. Start-up

9. Operation

9.1. Operation

11. Maintenance

11.1. Maintenance cycles

11.2. Checklist for hygiene checks

11.4. Cleaning

11.5. Inspecting the electrical system

15. Troubleshooting

No mist production

Low mist production

Water escapes from the overflow

Stulz ENS Series Specifications

General

Installation	Wall-mounted or floor-standing
Steam Generation	Electrode boiler
Cylinder Material	Stainless steel
Safety Features	Overheating protection, water level monitoring
Power Supply	400 V, 50/60 Hz
Steam Temperature	Approximately 100°C
Control Accuracy	+/- 1% RH
Material	Stainless steel
Protection Class	IP20
Water Quality	Demineralized or softened water