Stulz CyberOne EC DX User manual

CyberOneEC
Installation, Operation and Maintenance Manual
Chilled Water Systems
12 – 35 kW Systems
Vertical Floor Mounted, 60 Hz Data
CyberOne EC DX
Installation, Operation and Maintenance Manual
Perimeter Precision Air Conditioners
7-35 kW / 60 Hz

CyberOne EC DX IOM Manual
i
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
this manual for internal use only. No part of this document may be photocopied,
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 Air Technology
Systems, Inc. Distributing or photocopying this document for external distribution is in
direct violation of U.S. copyright laws and is strictly prohibited without the express written
consent of STULZ.
Unpublished — rights reserved under the copyright laws of the United States and of
other countries. Other brands and trade names are trademarks of theirrespective
owners.
Copyright 2020 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 DX IOM Manual
Table of Contents
1.0 Introduction....................................................1
1.1 General................................................................................1
1.2 Product Description .......................................................1
1.3 Safety ..................................................................................1
1.3.1 General................................................................................1
1.3.2 Safety Summary...............................................................2
1.4 General Design.................................................................3
1.4.1 Electrical Compartment ................................................3
1.4.2 Circuit Breakers/Motor Start Protectors ................5
1.4.3 Heaters (Optional) ...........................................................5
1.4.3.1 Hot Gas Re-heat..............................................................5
1.4.3.2 Hot Water Re-heat .........................................................5
1.4.4 Coil(s)...................................................................................5
1.4.5 EC Fan.................................................................................5
1.4.6 Temperature/Humidity Sensor...................................5
1.5 Optional Equipment........................................................5
1.5.1 Humidifier...........................................................................5
1.5.2 Condensate Pump ..........................................................5
1.5.3 Water Detector.................................................................5
1.5.4 Smoke Detector...............................................................5
1.5.5 Firestat................................................................................5
1.6 Free-cooling Operation.................................................6
1.7 AWS Operation................................................................7
2.0 Installation .....................................................8
2.1 Receiving the Equipment..............................................8
2.2 Moving the Equipment...................................................8
2.2.1 Conditioned Space..........................................................9
2.3 Mounting/Placement.....................................................9
2.3.1 Precision A/C Unit........................................................ 10
2.3.2 Outdoor Equipment ..................................................... 10
2.4 Air Distribution Connection ....................................... 10
2.4.1 Downflow Configuration Air Patterns .................... 10
2.4.2 Upflow Configuration Air Patterns.......................... 11
2.5 Optional Equipment (Field Installed) ......................12
2.5.1 Floor Stand .....................................................................12
2.5.2 Remote Display............................................................. 12
2.5.3 Transformer (For 277Volt Applications) ............... 12
2.5.4 Remote Temperature/Humidity Sensor.....................12
2.5.5 Remote Water Detector.............................................13
2.5.6 Plenum Box Assembly ................................................ 13
2.6 Piping Connections...................................................... 13
2.6.1 Refrigerant Piping ........................................................13
2.6.1.1 Self-Contained Systems ............................................ 13
2.6.1.2 Split Systems .................................................................13
2.6.1.3 Remote Air CooledCondensers (AR) .....................15
2.6.1.4 Remote AirCooled Condensing Units (AHU).......15
2.6.2 Water/Glycol ...................................................................... 15
2.6.3 Condensate Drain.........................................................15
2.6.3.1 Gravity Drain...................................................................15
2.6.3.2 Condensate Pump........................................................15
2.6.4 Humidifier........................................................................15
2.7 Utility Connections .......................................................16
2.7.1 Main Power.....................................................................16
2.7.1.1 Single-Phase Units 208/230V...............................17
2.7.1.2 Single-Phase Units 277V..........................................17
2.7.1.3 Single-Phase Units (208/230V) with 277/230V
Buck/Boost Transformer Applications ..................17
2.7.1.4 Three-Phase Units.......................................................18
2.7.2 Controls ...........................................................................18
2.7.3 Optional Equipment .....................................................18
2.7.3.1 Remote Temperature/Humidity Sensor ................18
2.7.3.2 Remote Water Detector .............................................18
2.7.4 Air-Cooled Split Systems ........................................... 18
2.7.4.1 Remote Condenser (AR Models) .............................19
2.7.4.2 Remote Condensing Unit(AHU Models)...............20
2.7.5 Glycol Systems (G Models) ........................................20
2.8 System Charging Procedures...................................21
2.8.1 Water/Glycol Systems.................................................21
2.8.1.1 Pump.................................................................................22
2.8.2 DX Unit Charging Requirements..............................22
2.8.3 Remote Air-CooledSystems (AR/AHU) ................ 22
2.8.4 R407C Refrigerant ..................................................... 22
2.8.5 Estimating Refrigerant Charge.......................................22
2.8.6 Preparing System For Charging...............................23
2.8.7 Refrigerant Charging Procedures..................................24
2.8.7.1 0 ºF Fan Cycling and -20 ºF Variable Speed
Control..............................................................................25
2.8.7.2 -30 °F Flooded HeadPressure Control................25
2.8.8 Refrigerant Characteristics.......................................26
2.8.8.1 Pressure/Temperature Settings ..............................26
2.8.8.2 Saturated Refrigerant Pressure Tables....................26
2.9 System Settings and Adjustments .......................... 26

CyberOne EC DX IOM Manual
2.9.1 Low/High Pressure Limit Switch ............................ 26
2.9.2 Head Pressure Controls-AirCooled Systems..... 27
2.9.2.1 Condenser Fan Cycling (Condenser Model SCS-
AA, 0 °F ).......................................................................... 27
2.9.2.2 Condenser Multi-Speed Fan Switch (Model HES-
CAA , 0 °F )...................................................................... 27
2.9.2.3 Variable Condenser Fan Speed (Condenser Model
SCS-SA, -20 °F)........................................................... 27
2.9.2.4 Intelligent Control (Condenser Model SCS-EC
only, -20 °F) ................................................................... 27
2.9.2.5 Flooded Head Pressure Control (Condenser
Model SCS-AA with Fan Cycling, -30 °F)............. 27
2.9.2.6 Flooded Head Pressure Control (Condenser
Model HES-CAA , -30 °F) ......................................... 28
2.9.3 Head Pressure Controls-Water/Glycol Cooled
Systems........................................................................... 28
2.9.4 Humidifier Adjustment................................................ 28
2.9.5 EC Fan ............................................................................. 28
2.9.6 Thermal Expansion Valve........................................... 28
2.9.7 Hot Gas Reheat (Optional) ........................................ 28
2.9.8 Hot Gas Bypass (Optional) ........................................ 29
2.9.8.1 Snap Acting.................................................................... 29
2.9.8.2 Full Floating.................................................................... 29
3.0 Commissioning, Operation and
Decommissioning ........................................ 30
3.1 Commissioning.............................................................. 30
3.1.1 Start-Up .......................................................................... 30
3.1.2 Microprocessor Controller Programming........... 30
3.2 Decommissioning the Unit ........................................ 30
3.2.1 Recovering Refrigerant.............................................. 31
3.2.2 Labeling the Decommissioned Unit ....................... 31
4.0 Maintenance ................................................ 32
4.1 Periodic General Maintenance................................. 32
4.1.1 CyberOne EC DX A/C Unit........................................ 32
4.1.1.1 Air Filter ........................................................................... 32
4.1.1.2 EC Fan ............................................................................. 32
4.1.1.3 Drain Pan......................................................................... 32
4.1.1.4 Coils .................................................................................. 32
4.1.1.5 Heat/Reheat ................................................................. 32
4.1.1.6 Humidifier ....................................................................... 32
4.1.1.7 Condensate Pump ....................................................... 33
4.1.2 Condenser...................................................................... 33
4.2 Troubleshooting ........................................................... 33
4.3 Field Service .................................................................. 38
4.3.1 Leak Detection.............................................................. 38
4.3.2 Leak Repair.................................................................... 38
4.3.3 Refrigerant Piping........................................................ 38
4.3.4 General Common Repairs/Component
Replacement ................................................................. 38
4.3.4.1 Compressor Failure ..................................................... 38
4.3.4.2 Standard Cleanout Procedure ................................. 39
4.3.4.3 Burn-Out/Acidic Cleanup Procedure.................... 39
4.3.4.4 Humidifier Cylinder Replacement........................... 39
5.0 Product Support...........................................41
5.1 Technical Support ........................................................ 41
5.2 Obtaining Warranty Parts .......................................... 41
5.3 Obtaining Spare/Replacement Parts.................... 41
Installation Checklist ............................................42
Glossary ................................................................. 45
Figures
Figure 1. Typical Internal Layout- Downflow
Configuration............................................................. 4
Figure 2. Typical Internal Layout- Upflow
Configuration............................................................. 4
Figure 3. Free Cooling Diagram............................................. 6
Figure 4. Alternate WaterSource Diagram........................ 7
Figure 5. Recommended Installation Clearance.............. 8
Figure 6. Typical Installation.................................................... 9
Figure 7. Downflow Configuration Typical Air
Patterns.................................................................... 10
Figure 8. Upflow Configuration TypicalAir Patterns .... 11
Figure 9. Optional Floor Stand Installation...................... 12
Figure 10. Condensate Pump................................................ 16
Figure 11. Sample Nameplate............................................... 16
Figure 12. Transformer Schematic ....................................... 18
Figure 13. Interconnecting Field Wiring Remote
Condenser............................................................... 19
Figure 14. Interconnecting Field Wiring Remote
Condensing Unit.................................................... 20
Figure 15. Interconnecting Field Wiring Glycol
Systems.................................................................... 21
Tables
Table 1. Weight of Refrigerant (lb/100 ft of
type L tubing).......................................................... 23
Table 2. Weight of Refrigerant For A/C Units (lb)........ 23

Nomenclature
COS-XXX-XXX-XX-X-EC
System
Capacity
in 1,000s
BTU/H Model AWS/FC Air Flow
Pattern Fan Cooling
COS =
CyberOne
024
042
060
096
120
AHU = Air Handling Unit
AR =Air-Cooled
Remote (Split)
G = Glycol-Cooled
RCU-O = Outdoor Propeller
Remote Condensing Unit
RCU-I = Indoor Centrifugal
Remote Condensing Unit
S = Single Pump
AWS = Alternate
Water Source
FC = Free Cooling
D =
Downflow
U = Upflow
EC = Direct Driven,
single in- let, two fold
backward curved
radial fan with
electronically
commutated (EC)
motor

CyberOne EC DX IOM Manual
1.0 INTRODUCTION
1.1 General
The CyberOne EC DX 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 aworld 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 in this manual. Theymust be
followed to avoid difficulties. Spare parts are available from
An advanced E² series microprocessorcontrolleris mounted
inside the CyberOne EC electric box. This controller provides
superior features for more comprehensive control of the
unit. These features include full 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 display panel is typically factory
mounted on thefront access door ofthe unit. As an option the
smallbezeldisplaymaybeshippedlooseforremotemounting
to a wall or control panel.
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 DX systems are designed to be installed
indoors unless otherwise noted on the equipment.
E ² Display-
Small Bezel
E ² Display- Large Bezel
1.2 Product Description
CyberOne EC DX systems are available in air- cooled,
water/glycol-cooled and alternate water source
configurations. The cooling capacity will depend on the unit
size, which can range from 24,000 to 120,000 BTU/H.
CyberOne EC systems are designed to operate with
R407C refrigerant. Refer to the unit nameplate to identify
which refrigerant is used with your system.
NOTE
The CyberOne EC system is designed to supply
air to only one room.
The functional modes of operation, in addition to cooling, are
heating, humidification and dehumidification, which provide
complete environmental control of a conditioned space. The
cabinet is available in two configurations. A compact 30.5 in.
wide by 31.5 in. deep frame for units ranging from 24,000
to 60,000 BTU/H and a 48 in. wide by 34 in. deep frame for
units ranging from 96,000 to 120,000BTU/H.
There are two basic airflow pattern configurations; upflow
and downflow. Cabinet height is determined bythese airflow
patterns. A downflow cabinet’s total height is 76 in. If an
optional flange duct/skirt connection is selected the total
height is 83 in. An upflow cabinet’s total height is 77 in.
with a standard flange duct/skirt connection. If an optional
discharge plenum box assembly is selected the total height
is 95.5 in.
E² Display- Touch Screen
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.
1.3 Safety
1.3.1 General
We use NOTES, CAUTIONS and WARNINGS in the
manualstodrawattentiontoimportantoperationalandsafety
information.
A bold text NOTE marks alerts you to an important detail.
A bold text CAUTION safety alert marks information that
is important for protecting the unit and its performance. Be
especially careful to read and follow all cautions that apply
to your application.
A bold text WARNING safety alert marks information that
is important for protecting personnel from harm. Pay very
close attention to all warnings that apply to your application.
An exclamation safety alert symbol precedes a general
WARNING or CAUTION safety statement.
A lightning safety alert symbol precedes an electrical
shock hazard WARNING statement.
1

CyberOne EC DX IOM Manual
1.3.2 Safety Summary
The following statements are general guidelines followed by
warnings and cautions applicable throughout the manual.
Prior to performing any installation, operation, maintenance
or troubleshooting procedure, read and understand all
instructions, recommendations and guidelines contained
within this manual. All maintenance and/or repairs must be
performed by a journeyman, refrigeration mechanic or an air
conditioning technician.
CAUTIONS
Never lift any component in excess of 35 pounds
without help. If a lifting device is used to move a
unit, ensure it is capable of supporting the unit.
When moving the unit it must be kept in its
normal installed position. If the unit is not kept
level and vertical, damage to the compressors
will result.
When the air conditioner is in the cooling mode,
the return air-intake and discharge (supply) must
be free of obstructions. Ensure panels are secure
and latched into position.
WARNING
Never operate the unit with any cover, guard,
screenpanel,etc., removed unless theinstructions
specifically state otherwise, then do so with
extreme caution to avoid personalinjury.
CAUTION
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.
WARNINGS
Allpersonnelworking onornearequipment 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.
WARNINGS
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. Always disconnect main power
priorto performing any service or repairs.
A lock-out tag-out procedure should be followed to
ensure that power is not inadvertently reconnected.
To prevent personal injury, stay clear of rotating
components as automatic controls may start them
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.
WARNING
Refrigerant (R407C) is used with this equipment.
Death or serious injury may result if personnel fail
to observe proper safety precautions. Great care
must be exercised to prevent contact of liquid
refrigerant or refrigerant gas, discharged under
pressure, with any part of the body. The
extremelylowtemperatureresultingfromtherapid
expansion of liquid refrigerant or pressurized gas
can cause sudden and irreversible tissue damage.
As a minimum, all personnel should wear thermal
protective gloves and face-shield/goggles when
working with refrigerant. Application of excessive
heat to any component will cause extreme pressure
and may result in a rupture.
Exposure of refrigerant to an open flame or a very
hot surface will cause a chemical reaction that will
form carbonyl fluoride, a highly poisonous and
corrosive gas commonly referred to as
fluorophosgene. In its natural state, refrigerant is
a colorless, odorless vapor with no toxic
characteristics. It is heavier than air and will
disperse rapidly in a well-ventilated area. In an
unventilated area, it presents a danger as a
suffocant.
2

CyberOne EC DX IOM Manual
Always refer to the manufacturer’s SDS provided
with the unit.
CAUTIONS
Certain maintenance or cleaning procedures may
call forthe use and handling of chemicals, solvents,
or cleansers. Always refer to the manufacturer’s
material Safety Data Sheet (SDS) prior to using
these materials. Clean parts in a well-ventilated
area. Avoid inhalation of solvent fumes and
prolonged exposure of skin to cleaning solvents.
Wash exposed skin thoroughly after contact with
solvents.
Do not use cleaning solvents near open flame or
excessiveheat.Weareyeprotectionwhen blowing
solvent from parts. The pressure-wash should
not exceed 30 psig. Solvent solutions should be
disposed of in accordance with local and state
regulatory statutes.
WARNING
When performing brazing or debrazing operations,
make certain the refrigeration system is fully
recovered and purged and dry nitrogen is flowing
through the system at the rate of not less than 1-2
CFM (0.03-0.06 m³/minute).
CAUTIONS
Cooling coils (and associated piping circuits)
are pressurized (up to 100 psi) and sealed
when they leave the factory. Before installing
the interconnecting piping, observe appropriate
safety precautions and release the pressure via
an available stem valve or Schrader valve prior to
uncapping the pipes.
After interconnecting piping is installed, the piping
system must be cleaned. If solvents/cleaning
solutions are used, ensure they are completely
flushed from the piping before connecting it to
the unit. Failure to do so may result in equipment
problems.
CAUTION
When installing and filling the chilled water or
water/glycol loop, all air must be bled from the
piping system.
WARNING
Do not use chloride based water conditioning
additives in condensate drain pans. This will cause
corrosion to occur on the coilfins.
1.4 General Design
The CyberOne EC DX system is housed in a steel frame
type cabinet and is rated for indoor use. The exterior of the
cabinet is coated with a powder coat finish to protect
against corrosion. A hinged door is located in the front of the
cabinetfor easy access to all components. Operatorcontrols
are conveniently located on the front of the cabinet.
NOTE
Customer specified nonstandard 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 a typical internal layout of a typical CyberOne
EC 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 upflow unit and identifies the major components. The
location of major components vary depending on model
number and options purchased.
1.4.1 Electrical Compartment
The electrical components are protected behind the front
hinged access door. The location ofthe electrical components
varies depending on the control options provided with your
unit.
The access door is safety interlocked with the main power
service disconnect switch (See Figure 1 and Figure 2)
preventing the door from opening when the switch in the On
position. The switch must be turned Off to gain access to the
electrical compartment.
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 locked in the
Off position to prevent unintendedoperation.
3

CyberOne EC DX IOM Manual
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.
RIGHT SIDE
FRONT VIEW
HEAT
EXCHANGER
RECEIVER
(OPTIONAL)
CONDENSATE
PUMP
DRAIN PAN
COMPRESSOR
FILTERS
(CUT
-
AWAY TO
SHOW DETAIL)
T/H SENSOR (BEHIND
SMOKE DETECTOR)
HUMIDIFIER
FIRESTAT
(OPTIONAL)
SMOKE DETECTOR
(OPTIONAL)
COILS
DISCONNECT
SWITCH (NOTE 1)
AIR PROVING
SWITCHES
STEAM
DISTRIBUTOR
ELECTRIC BOX
HEATER
EC FAN
Figure 1. Typical Internal Layout- Downflow Configuration
Model COS-024/060 Shown for Reference
Figure 2. Typical Internal Layout- Upflow Configuration
Model COS-096/120 Shown for Reference
4
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.
RIGHT SIDE
FRONT VIEW
EC FAN
HEATER
RECEIVER
(OPTIONAL)
CONDENSATE
PUMP
DRAIN PAN
HUMIDIFIER CONTROL
BOARD ENCLOSURE
HEAT
EXCHANGER
HUMIDIFIER
COMPRESSOR
DISCONNECT
SWITCH (NOTE 1)
COILS
ELECTRIC BOX
AIR PROVING
SWITCHES
FIRESTAT
(OPTIONAL)
T/H SENSOR
STEAM
DISTRIBUTOR
FILTER
SMOKE DETECTOR
(OPTIONAL)

CyberOne EC DX IOM Manual
1.4.2 Circuit Breakers/Motor Start Protectors
CyberOne EC systems incorporate state of the art
component protectionwith the use of motor start protectors
and circuit breakers. Ifan overload occurs the switches must
be manually re-set after the overload condition is cleared.
1.4.3 Heaters (Optional)
Optional heatersmaybefurnishedforre-heatingthesupplyair
as required to offset the sensible cooling of the system during
the dehumidification cycle and for the automatic heating
mode. As a standard, electric resistance heating elements are
factory installed in the supply airstream to heat the supply air.
1.4.3.1 Hot Gas Re-heat
As an option, hot gas re-heating may be provided for re-
heating the supply air as required to offset the sensible
cooling ofthe system during the dehumidification cycle.
1.4.3.2 Hot Water Re-heat
For this option, hot water heating coil(s) are factory installed
in the supply air stream after the cooling coils to heat the
supply air. A 2-way on/off valve is provided to control the
flow of hot water through the coils to maintain the correct
re-heat temperature.
1.4.4 Coil(s)
Cooling and optional hot water and hot gas reheat coils are
aluminum finned/copper tube construction. The coils are
leak tested and cleaned before installation by thefactory.
1.4.5 EC Fan
The unit is equipped with a high efficiency, Electronically
Commutated (EC) fan. EC fans utilize 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.
Thefan does not utilize drive belts. Fan speed is variable via a
0 to 10 VDC signal from the system controller. The fan motor
is equippedwith integralelectronics and does not requirethe
additionofsecondaryelectronics such asthermalprotection,
inverters orfilters.Thefanwillnot produceAC inverterwhine.
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.
1.4.6 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 Humidifier
CyberOne EC systems are offered with an optional
electrode steam humidifier.Thehumidifierisfactoryinstalled
insidethe air conditionerand includesfill and drain valves and
associated piping. Operation of the humidifier’s fill and drain
cycles is based onwaterconductivityand 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 thehumidifier.
1.5.2 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.
1.5.3 Water Detector
As an option, STULZ offers spottype orstrip/cable typewater
detectors. Upon sensing a water leak, the water detector
control circuit will signal the A/C system controller of the
alarm condition.
1.5.4 Smoke Detector
Optionally mounted in the return air stream, a photo-electric
smoke detector is used to sense the presence of smoke and
signalthecontrollerwhen asmoke alarmcondition exists and
shuts down the air conditioner.
1.5.5 Firestat
Optionally mounted in the return air stream, a fire detector
senses high return air temperature and signals the controller
when a fire alarm condition exists and shuts down the air
conditioner.
5