Stulz CyberOne EC CW User Manual (English)

Questions and Answers:

A
Anthony CampbellAug 2, 2025
What to do if EC fans fail to start in Stulz CyberOne EC CW Air Handlers?
- A
  Anne ParkerAug 2, 2025
  If the EC fans in your Stulz Air Handlers fail to start, begin by checking the main power source voltage and the power input cable. Then, reset the motor starter protector, verify the motor amperage, and adjust the MSP to the correct FLA if needed. Also, check for a Modbus control signal at each fan, referring to the electrical drawing for the correct terminals. Inspect the control transformer circuit breaker and reset it if there's no short circuit or ground fault. Determine and correct any cause of the EC fan’s internal overheat protection interrupting fan motor operation. If the problem persists, the fan may be defective and require repair or replacement.
D
Daniel HaysAug 6, 2025
How to troubleshoot an inoperable electric heater in Stulz Air Handlers?
- B
  brendawilliamsAug 6, 2025
  If the electric heater in your Stulz Air Handlers is inoperable, check for a tripped circuit breaker and any short circuits before resetting it. Ensure the temperature setpoint is appropriately high. Inspect for obstructions or dirty filters causing insufficient airflow across the heater elements. Reset the manual overheat safety switch, if tripped. Use an ohmmeter to check the heater element's continuity and replace it if burned out. Finally, inspect and replace or repair the contactor if it is defective.
A
Amber JacksonAug 10, 2025
Why is my Stulz Air Handlers system short of capacity?
- M
  Marcia ThomasAug 10, 2025
  If your Stulz Air Handlers system is short of capacity, begin by checking for low chilled water flow and locate and repair any leaks, then recharge the system. Ensure the supply water temperature is not too high. Replace a clogged drier/strainer if it feels cold. Finally, check the filters and dampers for reduced airflow and clear the coil fins of any debris.
F
fcisnerosAug 15, 2025
What to do if the humidifier is inoperable in Stulz Air Handlers?
- T
  teresa63Aug 15, 2025
  If the humidifier in your Stulz Air Handlers is inoperable, verify that the water supply is connected and turned on. Ensure the humidifier switch is in the Auto/On position. Check and tighten any loose electrical connections. If the humidifier circuit breaker has tripped, check for excess current draw, drain and refill the tank, and then reset the breaker. Repair or replace a defective contactor. Adjust the humidity setpoint if the relative humidity is above it. If the electrode canister change cylinder light is on, consult the humidifier manual. For low water conductivity, add a teaspoon of table salt to the water through the top of the cylinder, which is typically only needed on initial start-up.
J
Jamie TorresAug 18, 2025
How to fix a chilled water valve that fails to open or close in Stulz CyberOne EC CW?
- E
  Eric BarronAug 19, 2025
  If the chilled water valve in your Stulz Air Handlers fails to open or close, first ensure that the temperature setpoint is correctly adjusted. Next, check for control power to the chilled water valve, examining the wiring schematic and rewiring if necessary. If these steps don't resolve the issue, the actuator may have failed and require replacement.
J
Jerome SparksAug 25, 2025
Why is the hot water heater in my Stulz CyberOne EC CW Air Handlers not working?
- M
  Marcus Cruz MDAug 25, 2025
  If the hot water heater in your Stulz Air Handlers is inoperable, check the hot water flow at the supply source and inspect the piping for leaks or obstructions. Verify that the hot water supply temperature is adequate. Also, ensure that the temperature setpoint is not set too low.
A
Andrew YoungAug 28, 2025
What causes erratic control in Stulz CyberOne EC CW?
- M
  mleblancAug 28, 2025
  If the control of your Stulz Air Handlers is erratic, check the wiring against the schematic diagram to ensure it is properly connected and not broken.

Stulz CyberOne EC CW Specifications

General

Brand	Stulz
Model	CyberOne EC CW
Category	Air Handlers
Language	English

Summary

Nomenclature

Model Code Breakdown

Explains the coding system for CyberOne EC CW unit model numbers.

Introduction to CyberOne EC CW

General System Overview

General overview of the CyberOne EC CW system and its manufacturer.

Safety and Precautions

Crucial safety information, including warnings, cautions, symbols, and summary.

Product Description

Cabinet Sizes and Airflow Patterns

Details cabinet dimensions and airflow patterns (upflow/downflow).

Controller and User Interface

Describes the E2 controller and user interface terminal.

General Design and Components

Cabinet and Construction

Describes the steel frame cabinet, powder coat finish, and hinged access door.

Electrical Box and Components

Details the electric box, its safety interlock, and components.

Component Protection

Details on circuit breakers and motor start protectors for component safety.

Coils and EC Fan

Describes cooling/heating coils and the high-efficiency EC fan.

Sensors and Optional Equipment Overview

Covers standard T/H sensor and various optional equipment like heaters and humidifiers.

Optional Equipment

Heating Options

Details on optional electric or hot water reheat for supply air.

Humidifier

Information on the optional electrode steam humidifier.

Condensate Pump

Details the optional factory-installed condensate pump.

Water, Smoke, and Fire Detection

Covers optional water, smoke, and fire detectors for safety.

Remote Controls and Accessories

Discusses remote T/H sensors, graphic terminals, floor stands, and plenums.

Installation Procedures

Receiving and Moving the Unit

Instructions for inspecting, handling, and safely moving the unit.

Site Preparation and Clearances

Requirements for preparing the installation site, including clearances.

Conditioned Space Requirements

Specifies insulation and vapor barrier needs for the conditioned space.

Mounting and Placement Guidelines

Guidance on mounting the unit, considering rigidity and accessibility.

Floor Mounting Details

Details on floor mounting, including using floor stands and cutting the floor.

Air Distribution Connections

How to connect ductwork for downflow and upflow configurations.

Maintenance and Troubleshooting

Periodic General Maintenance

Outlines general maintenance tasks for optimal system performance.

Component Maintenance Procedures

Specific procedures for maintaining unit components like filters, fans, and coils.

Condensate Pump and Troubleshooting

Maintenance of the condensate pump and general troubleshooting steps.

Specific Troubleshooting Scenarios

Addresses common issues like EC fan failure, erratic control, and capacity loss.

Field Service Operations

Chilled Water Leak Repair

Locating and repairing leaks in the chilled water cooling system.

Humidifier Cylinder Replacement

Step-by-step procedure for replacing the humidifier cylinder.

Air Filter Replacement

Instructions for accessing and replacing air filters.

Product Support Information

Technical Support Contact

Contact information and procedures for obtaining technical assistance.

Warranty and Spare Parts

Process for obtaining warranty parts and purchasing spare parts.

Stulz CyberOne EC CW User Manual

Table of Contents