Stulz CyberOne EC CW User manual

CyberOne EC CW
Installation, Operation and Maintenance Manual
Perimeter Precision Air Handlers
12 kW - 35 kW / 60 Hz

CyberOne EC CW IOM Manual
Notice
This document contains information protected by copyright. All rights are reserved. The
owner of the equipment for which this manual is written may photocopy the contents of
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reproduced, or translated into another language for use by anyone other than the owner of
the equipment for which this manual is written without the prior written consent of STULZ
Air Technology Systems, Inc. (STULZ).
This document contains confidential and proprietary information of STULZ. Distributing or
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Unpublished — rights reserved under the copyright laws of the United States and of other
countries. Other brands and trade names are trademarks of their respective owners.
Copyright 2017 by STULZ Air Technology Systems, Inc. Printed in
the United States of America.
All rights reserved.
STULZ Air Technology Systems, Inc.
1572 Tilco Drive
Frederick, MD 21704 USA
https://www.stulz-usa.com

CyberOne EC CW IOM Manual
Table of Contents
1.0 Introduction....................................................1
1.1 General................................................................................1
1.2 Safety ..................................................................................1
1.2.1 Safety Summary...............................................................1
1.3 Product Description .......................................................2
1.4 General Design.................................................................2
1.4.1 Electric Box .......................................................................2
1.4.2 Circuit Breakers/Motor Start Protectors ................4
1.4.3 Coil(s)...................................................................................4
1.4.4 EC Fan.................................................................................4
1.4.5 Temperature/Humidity Sensor...................................4
1.5 Optional Equipment........................................................4
1.5.1 Heater .................................................................................4
1.5.1.1 Electric Reheat.................................................................4
1.5.1.2 Hot Water Re-heat .........................................................4
1.5.2 Humidifier...........................................................................4
1.5.3 Condensate Pump ..........................................................4
1.5.4 Water Detector.................................................................5
1.5.5 Smoke Detector...............................................................5
1.5.6 Firestat................................................................................5
1.5.7 Remote Temperature/Humidity (T/H) Sensor........ 5
1.5.8 Remote-mounted Graphic Terminal for the E2
Controller ...........................................................................5
1.5.9 Floor stands.......................................................................5
1.5.10 Plenums and Plenum Extensions...............................5
2.0 Installation .....................................................6
2.1 Receiving the Equipment..............................................6
2.2 Moving the Equipment...................................................6
2.3 Site Preparation ...............................................................6
2.3.1 Conditioned Space..........................................................7
2.4 Mounting/Placement.....................................................7
2.4.1 Floor Mounting .................................................................7
2.5 Air Distribution Connection ..........................................8
2.5.1 Downflow Configuration Air Patterns .......................8
2.5.2 Upflow Configuration Air Patterns.............................8
2.6 Optional Equipment (Field Installed) ...................... 10
2.6.1 Floor Stand .....................................................................10
2.6.2 Remote Controller Terminal ............................................10
2.6.3 Remote Temperature/Humidity Sensor................ 10
2.6.4 Remote Water Detector............................................. 10
2.6.5 Plenum Box Assembly ................................................ 11
2.7 Piping Connections ..................................................... 11
2.7.1 Condensate Drain ........................................................ 11
2.7.1.1 Gravity Drain................................................................... 11
2.7.1.2 Condensate Pump ....................................................... 11
2.7.2 Humidifier ....................................................................... 12
2.8 Utility Connections....................................................... 12
2.8.1 Main Power .................................................................... 12
2.8.1.1 Three-Phase Wiring Connections .......................... 13
2.8.2 Controls........................................................................... 13
2.8.3 Optional Equipment..................................................... 13
2.8.3.1 Remote Temperature/Humidity Sensor ................ 13
2.8.3.2 Remote Water Detector............................................. 13
2.8.4 Humidifier Adjustment................................................ 13
2.9 EC Fan.............................................................................. 13
3.0 Start-Up/Commissioning and Unit
Shutdown..................................................... 14
3.1 Operation ........................................................................ 14
3.2 Step by Step Start-Up Instructions........................ 14
3.3 Microprocessor Controller Programming............. 14
3.4 Unit Shutdown............................................................... 14
4.0 Maintenance ................................................ 15
4.1 Periodic General Maintenance ................................ 15
4.2 Maintenance Procedures .......................................... 15
4.2.1 Air Filter ........................................................................... 15
4.2.2 EC Fan.............................................................................. 15
4.2.3 Drain Pan......................................................................... 15
4.2.4 Coils .................................................................................. 15
4.2.5 Heat/Reheat.................................................................. 15
4.2.6 Humidifier ....................................................................... 15
4.2.7 Condensate Pump ....................................................... 16
4.3 Troubleshooting............................................................ 16
4.4 Field Service.................................................................. 19
4.4.1 CW Leaks........................................................................ 19
4.4.1.1 CW Leak Repair............................................................ 19
4.4.2 Humidifier Cylinder Replacement........................... 19
4.4.3 Air Filter Replacement ................................................ 19

CyberOne EC CW IOM Manual
5.0 Product Support .......................................... 20
5.1 Technical Support .........................................................20
5.2 Obtaining Warranty Parts ...........................................20
5.3 Obtaining Spare/Replacement Parts.....................20
Figures
Figure 1. Typical CW Internal Layout- Downflow
Configuration.................................................................... 3
Figure 2. Typical CW Internal Layout-Upflow
Configuration.................................................................... 3
Figure 3. Recommended Installation Clearance ..................... 6
Figure 4. Downflow Configuration Typical Air Patterns......... 8
Figure 5. Upflow Configuration Typical Air Patterns............... 9
Figure 6. Optional Floor Stand Installation ............................. 10
Figure 7. Condensate Pump ....................................................... 11
Figure 8. Sample Nameplate ...................................................... 12

CyberOne EC CW IOM Manual
1
Nomenclature
COS-XXX-CW-X-EC
System Capacity in
1,000s BTU/H Model Air Flow
Pattern
Fan Cooling
COS = CyberOne
042
060
096
120
CW =
Chilled Water
D =
Downflow Air
U = Upflow Air
EC = Direct Driven, single inlet,
two-fold, backward curved radial
fan with electronically commutated
(EC) motor
Call Product Support at 888 529 1266 for additional details.
Example: CyberOne EC CW, 42,000 BTU, Up Flow Air - COS-042-CW-U-EC

1
1.0 INTRODUCTION
1.1 General
The CyberOne EC CW floor mounted precision air
conditioning system covered by this manual is designed
and manufactured by STULZ Air Technology Systems,
Inc. (STULZ) and uses the latest, state-of-the-art control
technology. Recognized as a world leader, STULZ provides
air conditioning systems with the highest quality
craftsmanship using the finest materials available in the
industry. The system will provide years of trouble free
service if installed and maintained in accordance with this
manual. Damage to the unit from improper installation,
operation or maintenance is not covered by thewarranty.
Studythe instructions contained inthis manual. Theymust be
followed to avoid difficulties. Spare parts are available from
STULZ toinsurecontinuousoperation.Usingsubstituteparts
or bypassing electrical or refrigeration components in order
to continue operation is not recommended and will void the
warranty. Due to technological advancements, components
are subject to change without notice.
CyberOne EC CW systems are designed to be installed
indoors unless otherwise noted on the equipment.
1.2 Safety
NOTE, CAUTION and WARNINGstatements are used in this
manualto draw attention to important operationaland safety
information.
A bold text NOTE marks an importantdetail.
A bold text CAUTION marks information im-
portant to protecting your equipment and its
performance. Be especially careful to read and
followallcautionsthatapplytoyourapplication.
AboldtextWARNING marks safety information
important to protecting you and others from
harm. Pay very close attention to all warnings
that apply to yourapplication.
An exclamation — — symbol in aWARNING or CAUTION
indicates a general safety alert. A lightning bolt ——
symbol in a WARNING indicates an electrical shock hazard.
1.2.1 Safety Summary Priortoperformingany
installation,operation,maintenanceor troubleshooting
procedure,readandunderstandallrelevant instructions,
recommendations and guidelines contained within this
manual.
Certain maintenance or cleaning procedures may call for the
useand handlingofchemicals, solvents,orcleansers.Always
refer to the manufacturer’s Safety Data Sheet (SDS) prior to
using these materials. Clean parts in a well-ventilated area.
Avoid inhaling solvent fumes and prolonged exposure ofskin
to cleaning solvents. Wash exposed skin thoroughly after
contact with solvents.
The following warnings and cautions are applicable to the
equipment and operations documented in this manual.
WARNINGS
All personnelworking on ornear equipment should
be familiar with hazards associated with electrical
maintenance. Safety placards/stickers have been
placed on the unit to call attention to all personal
and equipment damage hazard areas. Never work
on electrical equipment unless another person
who is familiar with the operation and hazards of
the equipment and competent in administering
first aid is nearby.
This equipmentshould beserviced and repairedby
a journeyman refrigeration technicianonly.
To prevent personal injury stay clear of rotating
components, as automatic controls maystartthem
unexpectedly. Turn off power to the unit unless
you are performing tests that require power. With
power and controls energized,the unit could begin
operating at any time.
When working on electrical equipment, remove all
jewelry, watches, rings, etc.
Hazardous voltage will still be present inside the
electric box at the motor start protectors and
circuit breakers, even with the unit turned off at
the microprocessor controller. To isolate the unit
for maintenance, turn off power at the main power
disconnect switch.
CAUTIONS
After the return and supply piping is connected to
the unit, the entire system must be flushed prior to
beginning operation.
Once in service, the CyberOne CW EC unit should
not be drained and taken out of service for an
extended period of time. Formicary corrosion can
occur.
Do not use chloride based water conditioning
additives in the condensate drain pans. They will
cause corrosion to occur on the coil fins.

2
E2 Terminal — Large Bezel
E ² Terminal Small Bezel (Remote Only)
E2 Terminal — Touch Screen
1.3 Product Description
The CyberOne EC CW system comes in two cabinet sizes: A
compact 30.6 inches wide by 30.6 inches deep cabinet for
units ranging from 12 – 17.5 kW (42 – 60 MBH) and a 48
incheswide by 34 inches deep cabinetfor units rangingfrom
28 – 35 kW (96 – 120MBH).
The system is available in two airflow patterns: Upflow and
downflow. Cabinet height is determined by these airflow
patterns. See the STULZ CyberOne EC Chilled Water
Engineering Manual for cabinet dimensions, with and
without the optional discharge plenum box assembly.
NOTE
TheCyberOneEC CWsystem isdesignedtosupply
air to only oneroom.
The system’s functional modes of operation, in addition to
cooling, are heating, humidification and dehumidification,
which provide complete environmental control of a
conditioned space.
An advanced E² series microprocessor controller is mounted
inside the CyberOne EC CW electric box. This controller
provides superior features for comprehensive control of the
unit. Thesefeatures include: afull alarm system; input/output
monitoring status; full integrated control of heating, cooling,
humidification, and dehumidification; multi-A/C unit control;
and remote communication with building management
systems.
The E² user interface terminal is typically factory mounted
on the front access door of the unit. As an option, the small
bezel terminal may be shipped loose for remote mounting to
a wall or control panel.
An operating manual for the system controller is provided
under separate cover. Refer to that manual for detailed
instructions on operating the system controller provided
with your unit.
1.4 General Design
The CyberOne EC CW is housed in a steelframe type cabinet
and is rated for indoor use. The exterior of the cabinet is
coated with a powdercoatfinish to protect against corrosion.
A hinged door is located in the front of the cabinet for easy
access to all components. Operatorcontrols are conveniently
located on the front of thecabinet.
NOTE
Customer specified non-standard features or
design variations may not be described in this
manual. Refer to the installation and/or electrical
drawings supplied with your unit for details on
additional feature(s). In some cases, an addendum
to this manual may also be included to further
describe the feature(s).
Figure 1 depicts the internal layout of a typical CyberOne
EC CW downflow unit and identifies the major
components. The location of major components vary
depending on the model number and options purchased.
Figure 2 depicts a typical internal layout of a typical
CyberOne EC CW upflow unit and identifies the major
components. The location of major components vary
depending on model number and options purchased.
1.4.1 Electric Box
The unit’s electrical components are mounted in the electric
box behind a front hinged access door. The access door is
safety interlocked with the main power service disconnect
switch (See Figure 1 and Figure 2), preventing the doorfrom
openingwhenthe switchis intheOnposition.Theswitchmust
be set to Off to gain access to the electric box.

CyberOne EC CW IOM Manual
3
AIR PROVING
SWITCHES
DISCONNECT
SWITCH (NOTE 1)
CHILLED WATER
COIL
HOT WATER
REHEAT COIL
HUMIDIFIER
HUMIDIFIER DRAIN PAN
CONTROL
BOARD
ENCLOSURE
CONDENSATE
PUMP
EC FAN
HEATER
NOTES:
1.
SERVICE DISCONNECT SWITCH HANDLE IS MOUNTED TO FRONT DOOR OF CABINET.
2.
CABINET DOOR AND RIGHT SIDE ACCESS PANEL REMOVED TO SHOW INTERNAL PARTS.
COS-042/060-CW-D-EC
HEATER
ELECTRIC BOX
EC FAN
STEAM
DISTRIBUTOR
DISCONNECT
SWITCH (NOTE 1)
HOT WATER
REHEAT COIL
CONDENSATE
PUMP
FRONT SIDE
RIGHT SIDE
NOTES:
1. SERVICE DISCONNECT SWITCH HANDLE IS MOUNTED TO FRONT DOOR OF CABINET.
2. CABINET DOOR AND RIGHT SIDE ACCESS PANEL REMOVED TO SHOW INTERNAL PARTS.
COS-096/120-CW-U-EC
Figure 1. Typical CW Internal Layout- Downflow Configuration
Figure 2. Typical CW Internal Layout- Upflow Configuration
T/H SENSOR
FILTER
FILTERS
(CUT
-
AWAY TO
SHOW DETAIL)
CHILLED
WATER
COIL
DRAIN PAN
SMOKE DETECTOR
(OPTIONAL)
T/H SENSOR (BEHIND
SMOKEDETECTOR)
FIRESTAT
(OPTIONAL)
HUMIDIFIER
AIR PROVING
SWITCHES
RIGHT SIDE
FRONT SIDE
SMOKE DETECTOR
(OPTIONAL)
FIRESTAT
(OPTIONAL)
STEAM
DISTRIBUTOR
ELECTRIC BOX

CyberOne EC CW IOM Manual
4
The service disconnect switch may be used to turn the
unit off for emergency shutdown or when routine
maintenance is performed. The handle of the switch may
be tagged/locked in the Off position to prevent
unintended operation.
NOTE
Electric box components are labeled with reference
designators. See the unit electrical drawing
provided in the data package to identify the
components.
1.4.2 Circuit Breakers/Motor Start
Protectors
CyberOne EC CW systems incorporate state of the art
component protection with the use of motor start protectors
and circuit breakers located in the electric box. If an overload
occurs, the switches must be manually re-set after the
overload condition is cleared.
1.4.3 Coil(s)
Coolingand optional hotwater re-heating coils are aluminum
finned/copper tube construction. The coils are leak tested
and cleaned before installation by thefactory.
1.4.4 EC Fan
The unit is equipped with a high efficiency, electronically
commutated (EC) fan. EC fans have a brushless motor
equipped with permanent magnets and permanently
lubricated ball bearings. The fan impellers are backward
curved and attached to the rotor casing. The fan is balanced
and aerodynamically optimized to minimizevibration.
The fan does not use drive belts. Fan speed is variable,
controlled by a 0 to 10 VDC signal from the system
controller. The fan motor is equipped with integral
electronics and does not require the addition of secondary
electronics such as thermal protection, inverters or filters.
Thefanwill notproduce AC inverter whine.
EC fans feature an integrated monitoring function to protect
the motor and electronics against damage from jamming,
phase loss or overheating. If any of the following failure
conditions occur, the motor automatically stops and an alarm
is signaled:
a. Locked rotor1
b. Loss of a phase1
c. Low main supply voltage2
d. Over-heating of electronics2
e. Over-heating of motor2
1 Upon correction of these failure conditions, the
motor will automatically reset.
2 Upon correction of these failure conditions, the
motor must be manually reset by turning off power
for 20 seconds.
1.4.5 Temperature/Humidity Sensor
As a standard for room air control, a temperature/humidity
(T/H) sensor is factory mounted in the return air stream.
The T/H sensor monitors the return air conditions and
provides input signal(s) to the system controller to manage
the operation of the A/C unit consistent with the set points
entered in the system controller. As an option, sensor(s) may
be shipped loose for field installation. Refer to the electrical
drawing supplied with your unit for details specific to your
system.
1.5 Optional Equipment
1.5.1 Heater
Anoptionalelectric orhotwaterheatermay be mounted in the
supplyair stream after the cooling coils to reheat supplyair, as
may be required to offset the sensible cooling of the system
during the dehumidification cycle, and for the automatic
heating mode.
1.5.1.1 Electric Reheat
For this option, electric resistance heating elements are
factory installed.
1.5.1.2 Hot Water Re-heat
For this option, hot water heating coil(s) are factory installed.
A 2-way or 3-way modulating valve is provided to control the
flow of hot water through the coils to maintain the correct
re-heat temperature.
1.5.2 Humidifier
CyberOne EC systems are offered with an optional electrode
steam humidifier. The humidifier is factory installed inside
the air conditioner and includes fill and drain valves and
associated piping. Operation of the humidifier’s fill and drain
cycles is based onwater conductivity and is maintained bythe
humidifier controller. An operating manual for the humidifier
is provided under separate cover. Refer to that manual for
detailed information on operation of the humidifier.
1.5.3 Condensate Pump
An optional factory-installed condensate pump may be
provided. The pump automatically eliminates condensate
and humidifier flush water (if applicable) from the drain pan.
Should an overflow occur, an internal overflow safety switch
will signal the E² system controller of the alarm condition.

CyberOne EC CW IOM Manual
5
1.5.4 Water Detector
1.5.5 As an option, STULZ offers spottype or strip/cable
typewater detectors. Upon sensing a water leak, the water
detector control circuit will signal the A/C system
controller of the alarm condition.
1.5.6 Smoke Detector
Optionally mounted in the return air stream, a photo-electric
smoke detector is used to sense the presence of smoke and
signalthe controllerwhen a smokealarm condition exists.The
controller responds by shutting down thesystem.
1.5.7 Firestat
Optionally mounted in the return air stream, a fire detector
senses high return air temperature and signals the controller
when afire alarm condition exists. Thecontrollerresponds by
shutting down the system.
1.5.8 Remote Temperature/Humidity
(T/H) Sensor
A T/H sensor may be selected as an option for use with the
COS EC CW unit. The sensor will be shipped loose for field
installation somewhere in the conditioned space away from
the unit.
1.5.9 Remote-mounted Graphic Terminal
for the E2 Controller
A “small-bezel” E2 graphic terminal may be selected for
remote mounting to remotely control the E2 controller. An
optional30ft, 75 ftor150 ft cablefor connectingthe graphic
terminal to the E2 controller may also be selected.
1.5.10 Floor stands
Seismic and non-seismic, open or enclosed, floor stands are
available for downflow units in both COS EC CW footprints
(042/060 and 090/120). Floor stands are available with
or without a turning vane to direct the process air exiting a
downflow unit.
1.5.11 Plenums and Plenum Extensions
2- and 3-way 18.5” discharge plenum boxes are available for
upflow units, and 24”, and 36” plenum extensions are
available for downflow and upflowunits.

CyberOne EC CW IOM Manual
6
USER
INTERFACE
TERMINAL
DISCONNE
CT SWITCH
HINGE
D
DOOR
36
IN
2.0 INSTALLATION
2.1 Receiving the Equipment
Your CyberOne EC CW precision A/C system has been
tested and inspected prior to shipment. To ensure your
equipment is received in excellent condition, visually inspect
the equipment immediately upon delivery. Carefully remove
the shipping containerand all protective packaging. Remove
the access panels and thoroughly inspect the unit interior
for any signs of transit-incurred damage. If there is shipping
damage, it must be noted on the freight carrier’s delivery
forms before signing for the equipment. Any freight claims
must be done throughthe freight carrier; STULZ can assist in
the claim filing process with the freight carrier. STULZ ships
all equipment FOB. Should any damage be present, notify
STULZ Product Support prior to attempting any repairs.
Refer to “5.0 Product Support” on page 19 of this manual
for instructions.
A unit data package was sent with your unit. It contains this
manual, a supplemental microprocessor controller manual,
system drawings, applicable SDS’s, warranty registration,
other component manuals and applicable instructions
based on the configuration and options of your unit. The
data package has been placed in your unit in a clear plastic
bag. These documents need to be retained for future
reference.
NOTE
Items that have been shipped loose, such as
controller terminal, temperature/humidity sensors,
water detectors, etc., are shipped inside the air
conditioner unless specified otherwise by the
customer. A plenum box (if applicable) is shipped
separately. Unpack and store these items in a safe
place unless you are using them immediately.
2.2 Moving the Equipment
CyberOne EC CW systems are designed to be kept in a
vertical position. The unit is shipped on a skid to facilitate
moving prior to installation. Move the unit with a suitable
device such as a forklift, pallet jack or roller bar and dollies
capable of handling the weight of the unit. The unit should
always bestored indoorsin a drylocationpriorto installation.
CAUTION
When movingthe unit itmust beliftedverticallyand
kept in a level position to preventdamage.
2.3 Site Preparation
CyberOne EC CW systems are designed with easy service
access in mind. A hinged access door is provided on the
front of the unit and removable access panels are located
on each side. In order to have full service access to internal
components,no permanent obstructionsshould be placed in
frontofthe unit. See Figure 3 fortheminimum recommended
front installation clearance.
NOTE
Working clearance requirements need to be
established prior to mounting the unit. Refer to
local and national electrical codes.
Figure 3. Recommended Installation Clearance
When determining the installation location consider howyou
will route the piping and wiring into the cabinet and ensure
access is available (see “2.7 Piping Connections” on page
11). Pilot holes for piping and wiring are located on the
CyberOne EC CW unit based on the configuration. On an
upflow configuration, the pilot holes are located in the top of
the cabinet. On a downflow configuration, they are located in
the floor ofthe cabinet. See the installation drawing provided
with your unit for pilot holelocations.

CyberOne EC CW IOM Manual
7
2.3.1 Conditioned Space
Certain steps should be taken to minimize the effects of
the environment surrounding the conditioned space. This is
especially important for critical/precision room preparation
(computer rooms/labs) requiring close tolerance control of
temperature and humidity. The conditioned space should be
well insulated and include a vapor barrier. The installer
should ensure that the proper insulation rating is used
based on the design of the space, which was the basis for
the system selected. The following table is a recommended
minimum R-value (thermal resistance) to ensure optimum
equipment operation.
Structure R-Value
Ceiling R-38
Wall R-21
Floor R-19
Door R-5
The vapor barrier is the single most important requirement
for maintaining environmental control in the conditioned
space. The vapor barrier in the ceiling and walls can be
a polyethylene film. Concrete walls and floors should be
painted with a rubber- or plastic-based paint. Doors and
windows should be properly sealed and a door sweep used
to minimize leakage. Outside or fresh air should be kept to a
minimum (as it adds to the cooling, heating, dehumidification
and humidifying loads), while maintaining the requirement of
the Indoor Air Quality (IAQ) standard. Ignoring the above can
cause erraticoperation,unstable roomcontrolandexcessive
maintenance costs.
2.4 Mounting/Placement
CyberOne EC CW systems that are not ducted are designed
to be located in the conditioned space. Ducted units may be
located either inside or outside the space to be conditioned
but are designed to supply air to only one room. They have
a compact footprint which allows the units to be placed in a
corner or between cabinetry. It is recommended to position
the unit to obtain optimum air circulation.
NOTE
These units use welded frame construction for unit rigidity.
The system is designed to be installed on a roof curb,
which is provided by others and ducted into a singular
space to be conditioned. Ensure the curb is sealed to
prevent air leakage. See the detail drawing provided with
the unit for interface dimensions. These units are designed
to be ducted to a space to be conditioned and are intended
to condition only one room.
NOTE
Placement of the floor or ceiling registers is
important. If they are too close to the unit, the
supply air will be recirculated back to the unit
before it has circulated throughout the space.
The unit is designed to be located directly on top of the floor
(typically upflow) or on a raised floor (typically downflow).
CAUTION
Ensure the mounting surface is capable of
supporting the equipment. Before mounting the
unit, refer to the weight table provided on the
installation drawing. On some raised floor
installations, a floor stand is required, depending
on the load capacity of the existing raised floor.
2.4.1 FloorMounting
The CyberOne EC CW unit uses a frame and panel
constructionforunitrigidityandfull serviceaccessibilitywhile
the unit is mounted in place.
If a floor stand is selected (see Figure 6), refer to the
installation drawing provided and cut out the raised floor to
match the unit’s overall base dimension. If a floor stand is not
selected, use the installation drawing and cut out the raised
floorto match the blower discharge opening(s) and cut out the
holes required for piping and wiring through the raised floor.
NOTE
The equipment must be level to operate properly.

CyberOne EC CW IOM Manual
8
Figure 4. Downflow Configuration Typical Air Patterns
2.5 Air Distribution Connection
2.5.1 Downflow Configuration Air Patterns
In a downflow unit, the conditioned supply air discharges through the bottom of the unit, typically into a raised floor. There are
two basic return air patterns: top free return and top ducted return (see Figure 4).
If ductwork is to be installed, always consult your local and state codes to determine ducting requirements. The duct system
should be designed to allow the air to move with as little resistance as possible.
The return inlet is provided with flanges for connecting ductwork. Refer to the installation drawing provided with the unit.
Ductwork may be connected with either pop rivets or self-tapping screws.
2.5.2 Upflow Configuration Air Patterns
In a configured unit, the conditioned supply air has two methods of discharge: Ducted or through a 2- or 3-way grilled
discharge plenum box (see Figure 5). There are two basic air patterns: front free return and rear ducted return. Consult your
local or state codes to determine ducting requirements before ducting the unit. The duct system should be designed to allow
the air to move with as little resistance aspossible.
Supply air outlets and the rear ducted return are provided with flanges for connection of the ducting. Refer to the installation
drawing provided with the unit. Ductwork may be connected with either pop rivets or self-tapping screws.
TOP DUCTED RETURN
TOP FREE RETURN
SUPPLY
AIR OUTLET
SUPPLY
AIR OUTLET
RETURN
AIR INLET
RETURN
AIR INLET

CyberOne EC CW IOM Manual
9
Figure 5. Upflow Configuration Typical Air Patterns
REAR DUCTED RETURN
FRONT FREE RETURN
RETURN
AIR INLET
RETURN
AIR INLET
SUPPLY
AIR OUTLET
TOP DUCTED DISCHARGE
SUPPLY
AIR OUTLET
REAR DUCTED RETURN
FRONT FREE RETURN
RETURN
AIR INLET
RETURN
AIR INLET
SUPPLY
SUPPLY
AIR OUTLET
AIR OUTLET
TOP DISCHARGE- 2 OR 3-WAY PLENUM BOX

CyberOne EC CW IOM Manual
10
2.6 Optional Equipment (FieldInstalled)
NOTE
Do not mount any optional equipment on the unit
access doors.
2.6.1 Floor Stand
Install the floor stand (see Figure 6) directly on the sub-floor
on the isolation pads supplied, ensuring the side with the
FRONT label is facing the same direction as the front of the
precision A/C unit. Refer to the floor stand assembly
drawing for the dimensions required to cut the raised floor.
The optional floor stand is designed with adjustable feet on
allthe legs allowing forleveling and overallheight adjustment.
Refer to the floor stand assembly drawing for minimum and
maximum height adjustability of your floor stand. To adjust
the height, first loosen the middle hex nuts on each leg. Next,
turn the top hex nuts to raise or lower the floor stand. Once
the floor stand is level and even with the raised floor, lock all
feet in place by tightening the middle hex nuts against the
top hex nuts.
2.6.2 Remote Controller Terminal
As an option, the E² controller terminal may be remotely
mounted. Refer to the system drawings and supplemental
controller manual sent in the data package with your unit for
mounting and wiring instructions.
Figure 6. Optional Floor Stand Installation
2.6.3 Remote Temperature/Humidity
Sensor
The remote temperature/humidity (T/H) sensor must be
located so that it will properly sense the temperature/
humidity conditions to be controlled. The T/H sensor should
not be mounted near a doorway or an area where it would be
exposed to direct sunlight.When locating the sensor, consider
the length of wire to be used. As an option, a 75 foot or 150
foot long cable may be provided by. Follow the steps below
to mount thesensor.
Temperature /Humidity Sensor
1. Remove the coverfrom the base ofthe sensorby squeez-
ing it at the top and bottom.
CAUTION
Take care not to damagethe exposed temperature/
humidity sensors on the PC boardwhen the cover is
removed. The sensors can be damaged if handled
improperly.
2. Temporarily place the base against the mounting sur-
face.
3. Level the base. Mark and drill mounting holes through at
least two of the available slottedholes.
4. Run a 3-conductor shielded cable through the opening
in the base, then secure the base with screws ensuring
the word TOP on the PC board is oriented upward.
5. Make the wiring connections. Refer to “2.8 Utility Con-
nections” on page 12 and the wiring diagram supplied
with your unit.
6. Seal the hole in the wall behind thesensor.
7. Replace the cover plate on thebase.
2.6.4 Remote Water Detector
Theremotewaterdetectorisnormallyplacedonthesub-floor
or in a field-supplied auxiliary drain pan located beneath the
unit. provides two types of water detectors, installed as
follows:

CyberOne EC CW IOM Manual
11
Spot type water detector
Remove the protective cover and connect two control wires
to the terminals on the base(terminal
lugs are provided). Replace the cover
and place the water detector(s) on the
floor with the metal electrodes facing
down. When water is present, current
will flow between the electrodes. The
base is provided with a mounting hole
in the center which may be used to
secure the water detector in place.
NOTE
Do not place the spot type water detector on an
electrically conductive surface.
Cable type water detector
Lay the cable water detector flat across the sub-floor where
water could collect. When
water is present, current will
flow between the two wires. A
two conductor wire harness is
provided with a quick connect
fitting on the end. The harness mates to the fitting on the
water detector cable and connects it to the terminal block
inside the electric box.
2.6.5 Plenum Box Assembly
If an optional plenum box (plenum extension box or 1-, 2- or
3-way discharge plenum box) is purchased it is typically
shipped loose. To install a plenum box, first apply a strip of
sealing foam around the top flange of the A/C unit or, run a
bead of silicone sealant. Place the plenum assembly on top
of the unit as shown in Figure 5 on page 9. Attach the
plenum with the self-tapping screws provided. Holes are
pre-drilled in the unit and the plenum box. If mounting an air
distribution plenum box, the grilles may be removed for access
to the mounting holes.
2.7 Piping Connections
For downflow models, piping is routed throughthe bottom of
the cabinet. For upflow models, the piping is routed through
the top of the cabinet. If an optional plenum box is installed,
drill holes in the top or in the side of the box, as preferred, to
route the piping out.
2.7.1 Condensate Drain
2.7.1.1 Gravity Drain
A 7/8 inch O.D. copper (sweat type) line is provided todrain
the condensate pan. An S-trap is internally-installed in the
condensate drain piping. An installer should connect a 7/8
inch I.D. drain line to remove water from the cabinet. If an
optional humidifier is used, the drain line from the humidifier
is typically connected to the condensate drain line.
NOTE
During normal operation, the humidifier drain line
discharges (hot) water into the condensate drain
line.
The drain line must be located so it will not be exposed to
freezing temperatures. The diameter of the drain line should
be the full size of theconnection.
NOTE
Pour some water into the condensate drain pan(s)
prior to start-up. This fills the trap and prevents air
from being drawn up the drain lines.
2.7.1.2 Condensate Pump
An optional condensate pump is normally factory installed.
The drain connection line is typically 1/2” I.D. vinyl tubing or
a 1/2” O.D. copper (sweat connection) maybe used.
Figure 7. Condensate Pump
INLET 7/8 OD
OUTLET 1/2 OD

CyberOne EC CW IOM Manual
12
2.7.2 Humidifier
CyberOne EC CW systems optionally include an electrode
steam humidifier. Thehumidifier empties into the condensate
drain line during the flush/drain cycle. A water supply line
must be connected to the ¼” O.D. copper tubing
connection supplied by the factory. Refer to the installation
drawing supplied with your unit for the location of the
water supply connection. The humidifier requires normal
tap water for the water supply. If the supply water is high in
particulates an external filter may be needed.
CAUTION
Do not use demineralized water in the humidifier.
Refer to the humidifier operator’s manual, supplied with the
equipment, for complete manufacturer’s information on the
humidifier and the supply water recommendations.
2.8 Utility Connections
2.8.1 Main Power
The CyberOne EC CW uses three phase power in a range
of voltages. The operating voltage, frequency and phase
provided to the unit must match the specifications on the
unit nameplate (See Figure 8). The nameplate also provides
the full load amps (FLA), the current the unit will draw under
full design load, the minimum circuit ampacity (MCA) for
wire sizing, and the maximum fuse or HACR (Heating, Air
Conditioning, Refrigeration) breaker size (MAX FUSE/CKT
BKR) for circuit protection. The unit’s nameplate is located
inside the electrical box.
Theunit is equippedwithterminals forallrequiredfield-wiring.
Refer to the electrical drawing supplied with the unit for all
power and control field-wiring. It is important to identify the
options that were purchased with the unit in order to confirm
which field connections are required.
NOTE
If the nameplate states MAX FUSE/CKT BKR,
fuses or an HACR-type circuit breaker must be
used to protect the system. Other protection
devices are not allowed based upon the product
listing.
The unit is providedwith main powerand controlpilot holesfor
connecting field-wiring conduits. These pilot holes are located
on the CyberOne EC CW unit based on the configuration. On
an upflow unit, the pilot holes are located in the top of the
cabinet. On a downflow unit, they are located in the floor of
the cabinet. A label stating “MAIN POWER INPUT” is placed
in close proximity. See the installation drawing provided with
your unit for pilot hole locations. Terminate the main power
wires at the line side of the main power service disconnect
switch located in the electric box. A separate equipment
ground lug is provided in the electrical box for connecting
an earth ground wire.
NOTE
Use onlycopperconductors in wiring connections.
Wiring terminations may become loose during
transit of the equipment; therefore, verify that all
wiring terminations are secure.
WARNING
Verify power is turned off before making
connections to the equipment.
A main distribution panel must be provided with a manual
fused disconnect switch or HACR-type circuit breaker for
service to the equipment, per local and national electrical
codes. Do not mount a customer supplied manual fused
disconnect switch or HACR-type circuit breaker to the surface
of the unit.
Figure 8. Sample Nameplate

CyberOne EC CW IOM Manual
13
CAUTION
An adequate earth ground must be connected to
the unit before operating the unit.
NOTE
All wiring must be provided in accordance with local
and national electrical code requirements.
Verifythe main power supplymatches thevoltage, phase and
frequency specified on the system nameplate. The supply
voltage measured at the unit must be within ±10% of the
voltage specified on the system nameplate.
CAUTION
Do not connect any additional loads to the system
control transformers. Connecting additional loads
to the factory supplied control transformer(s) may
overload the transformer(s).
2.8.1.1 Three-Phase Wiring Connections
CyberOne EC CW units are designed to have the L1, L2 and
L3 supply wires connected to corresponding L1, L2 and L3
line terminals on the non-fused service switch. The unit will
operate correctly if the supply wires are connected in this
manner.
2.8.2 Controls
STULZ offers a wide range of control features to meet
your air conditioning control/alarm requirements. If the
system controller is mounted on the unit (standard), no
utility connection is required. As an option, the E² controller
terminal may be remotely mounted. A six-conductor cable
is provided for interconnect wiring. Refer to the electrical
drawingsuppliedwith yourunit fordetails on interconnecting
the field wiring.
2.8.3 Optional Equipment
NOTE
All wiring must meet local and national electrical
code requirements.
2.8.3.1 Remote Temperature/Humidity Sensor
The remotetemperature/humidity sensorrequires a shielded
cable withtheshield terminated at theunit electric box.Three
control conductors are required. Both the electric box and
the sensor include a terminal strip with box-type lugs for wire
connections. Refer to the electrical drawing supplied with your
unit for the appropriate wireterminations.
2.8.3.2 Remote Water Detector
Each remotewaterdetectorusedwill requiretwo conductors
to be wired to the control terminal board in the unit electric
box.Thewire insulation must be rated at 600V. Referto “2.6.4
Remote Water Detector” on page 10 and see the electrical
drawing supplied with your unit for proper wire terminations.
2.8.4 Humidifier Adjustment
The humidifier has an adjustable capacity potentiometer on
the humidifier control circuit board. The potentiometer may
need to be field adjusted if the humidifier is not supplying
enough capacity for the current room conditions.
It is recommended that if the humidifier capacity
potentiometer requires adjustment, the adjustment is
made in small increments and verified. Refer to the
humidifier manual sent with your unit for the capacity
potentiometer location.
CAUTION
Adjusting the capacity potentiometer too high
may result in the formation of condensate within
the system.
2.9 EC Fan
The speed of the EC fan is controlled via a 0 to 10 VDC
signal from the system controller. The controller is set by the
factory and should not require adjustment. If it is determined
that the air flow needs adjustment, this may be done using
the controller’s programming menu selections. Refer to the
operator’s manual provided under separate cover for the
system controller. It is recommended that STULZ Product
Support be contacted before making adjustments to the
controller.

CyberOne EC CW IOM Manual
14
3.0 START-UP/COMMISSIONING
AND UNIT SHUTDOWN
3.1 Operation
For new installations, ensure the unit is ready to operate by
completing the Start-Up Checklist contained in the data
package that accompanied your unit.
NOTE
A Warranty Registration and Start-Up Checklist
is provided in the unit data package. It should be
completed during start-upand sentto STULZ.This
checklist should be used as a guideline for items
that need to be confirmed duringstart-up.
Start-up must be performed by a journeyman, refrigeration
mechanic or an air conditioning technician.
3.2 Step by Step Start-Up Instructions
1. Replace all equipment removed prior to performing the
start-up checks.
2. Apply powertothe CyberOne EC CWsystem atthe main
power disconnect switch.
3. Ensure that all blowers and fans are rotating correctly
and freely without any unusualnoise.
4. Test cooling operation by setting the temperature set
point below the actual room temperature to create a
demand for cooling. The discharge air should feel cooler
than the return air.
5. Test optional heating operation by adjusting the tempera-
ture set point above the actual room temperature. The
source ofheat should be energized to increase discharge
air temperature.
For Electric Reheat, use an amp meter on the heater
circuit to verify the heater is operational. For Hot Water
Reheat, ensure the control signal has energized the
control valve and the temperature of the water has
decreased as it passes through the unit.
6. If a humidifier is present, test humidification operation
by creating a demand for humidification. Use an amp
meter to determine current draw of the humidifier. Visu-
ally check for vapor leaving the steam head or feel if the
cylinder is warm to verify the humidifier is operational.
In all cases, one to six hours might be required to see
a desired level or rise in humidity in the conditioned
space. Once room conditions have been programmed
or set, a repeat visit to the conditioned space may be
required to ensure the humidifier is meeting theroom’s
requirements.
AnOperationand Maintenancemanualforthehumidifier
is provided with your unit under separate cover. Refer
to that manual for detailed information on humidifier
operation.
3.3 Microprocessor Controller
Programming
The E2 microprocessor controller is factory programmed
based on the model of the A/C system and optional features
selected. Most applications require no field start-up or
program adjustment beyond setting the current date and time.
Separate operating instructions for the controller have been
sent with your unit, including each feature’s factory “default”
setting and the available adjustment range, if applicable.
3.4 Unit Shutdown
To shut down the unit, command the shutdown from the
BMS managing the unit or use the user interface terminal
connected to the unit controller to power down the unit, as
described in the controller operator manual.
To perform an emergency shutdown, set the main power
disconnect switch to the Off position.

CyberOne EC CW IOM Manual
15
4.0 MAINTENANCE
4.1 Periodic General Maintenance
Systematic, periodic general maintenance of the CyberOne
EC CW unit is required for optimal system performance.
General maintenance should include, but not be limited to,
the following: Replacing filters and humidifier cylinders,
tightening electrical connections, checking the condensate
drain line to ensure it is free of debris, cleaning the interior of
the unit, visually inspecting the unit’scomponents.
Use copies of the Periodic General Maintenance Checklist
located in the back of this manual to record periodic
general maintenance inspections. For assistance, contact
STULZ Product Support. Follow all safety statements while
performing any type of maintenance.
WARNINGS
This equipmentshould beserviced and repaired by
a journeyman refrigeration technicianonly.
This unit employs high voltage equipment with
rotating components. Exercise extreme care to
avoid accidents and ensure proper operation.
Hazardous voltage will still be present inside the
electric box at the motor start protectors and
circuit breakers, even with the unit turned off at
the microprocessor controller. To isolate the unit
for maintenance, turn off power at the main power
disconnect switch. Always disconnect main power
priorto performing any service or repairs.
Turn off powerto the unit unless you are performing
tests that require power. With power and controls
energized, the unit could begin operating
automatically at any time. To prevent personal
injury, stay clear of rotating components as
automatic controls may start them unexpectedly.
4.2 Maintenance Procedures
4.2.1 Air Filter
The air filter is usually the most neglected item in an air
conditioningsystem.Tomaintain efficientoperation,thefilter
should be checked at least monthly and replaced as
required.
NOTE
Air quality in conditioned spaces varies.Aschedule
for checking air filters should be based on those
conditions.
4.2.2 EC Fan
Periodically check the EC fan system wiring, motor mounts,
housingand impellerwheel. Ensure allelectrical connections
aretight. Verifyall mounts are secure andthe impellerwheel is
tightlymounted.Impellerbladesshouldbekeptfreeofdebris.
4.2.3 Drain Pan
Inspect the drain pan on a monthly basis to ensure proper
drainage. Ensure the drain pan outlet is always free of debris
and the drain pan does not leak.
4.2.4 Coils
Coil(s) should be inspected semi-annually and cleaned
as required, following standard coil cleaning practices.
Using a brush, clean the coil fins of all debris that will inhibit
airflow. This can also be done with compressed air or with
a commercial coil cleaner. Check for bent or damaged coil
fins and repair as necessary. Check all lines and capillaries
for vibration isolation and support as necessary. Check all
piping for signs of leaks.
4.2.5 Heat/Reheat
The heat/reheat equipment should be inspected semi-
annually to ensure it is operational. If you have electric heat/
reheat, inspect the heating elements to ensure they are free
of debris.
4.2.6 Humidifier
Thesteam cylinderhas alimitedlifetime and mustbe replaced
periodically. Because water conditions and humidifier usage
rates vary greatly, it is difficult to establish intervals for
changing the cylinder. Individual maintenance schedules
must be determined for each location, based upon periodic
examination of the humidifier. A yellow LED on the
humidifier cabinet will flash four times in a repeating
pattern when the cylinder requires replacement.
NOTE
The yellow LED may illuminate during initial start-
up but it doesn’t necessarily mean the cylinder
needs to be replaced.
Refer to 4.4.2 Humidifier Cylinder Replacement and the
humidifier operator’s manual supplied in the unit data
package for detailed instructions on changing the cylinder.