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Summary of Contents for Stulz CyberOne EC DX
- Page 1 CyberOneEC CyberOne EC DX Installation, Operation and Maintenance Manual Installation, Operation and Maintenance Manual Chilled Water Systems Perimeter Precision Air Conditioners 12 – 35 kW Systems 7-35 kW / 60 Hz Vertical Floor Mounted, 60 Hz Data...
- Page 2 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).
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Page 3: Table Of Contents
CyberOne EC DX IOM Manual Table of Contents 2.6.1 Refrigerant Piping ............13 Introduction ............ 1 2.6.1.1 Self-Contained Systems ..........13 General................1 2.6.1.2 Split Systems ..............13 Product Description ............1 2.6.1.3 Remote Air Cooled Condensers (AR) ..... 15 Safety .................. - Page 4 Figure 10. Condensate Pump ..........16 Periodic General Maintenance......... 32 Figure 11. Sample Nameplate ..........16 4.1.1 CyberOne EC DX A/C Unit ........32 Figure 12. Transformer Schematic ........18 4.1.1.1 Air Filter ................32 Figure 13. Interconnecting Field Wiring Remote Condenser ...............
- Page 5 Nomenclature COS-XXX-XXX-XX-X-EC Capacity Air Flow in 1,000s System Model AWS/FC Fan Cooling Pattern BTU/H AHU = Air Handling Unit AR =Air-Cooled EC = Direct Driven, Remote (Split) single in- let, two fold G = Glycol-Cooled AWS = Alternate backward curved COS = RCU-O = Outdoor Propeller Water Source...
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Page 6: Introduction
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. Product Description ²... -
Page 7: Safety Summary
CyberOne EC DX IOM Manual 1.3.2 Safety Summary WARNINGS The following statements are general guidelines followed by When working on electrical equipment, remove all warnings and cautions applicable throughout the manual. jewelry, watches, rings, etc. Prior to performing any installation, operation, maintenance... -
Page 8: General Design
Wash exposed skin thoroughly after contact with General Design solvents. The CyberOne EC DX system is housed in a steel frame type cabinet and is rated for indoor use. The exterior of the Do not use cleaning solvents near open flame or cabinet is coated with a powder coat finish to protect... -
Page 9: Typical Internal Layout- Downflow Configuration
CyberOne EC DX IOM Manual SMOKE DETECTOR (OPTIONAL) FILTER T/H SENSOR FIRESTAT STEAM (OPTIONAL) DISTRIBUTOR ELECTRIC BOX AIR PROVING SWITCHES COILS DISCONNECT SWITCH (NOTE 1) COMPRESSOR HUMIDIFIER HEAT EXCHANGER HUMIDIFIER CONTROL DRAIN PAN BOARD ENCLOSURE RECEIVER CONDENSATE (OPTIONAL) PUMP HEATER... -
Page 10: Circuit Breakers/Motor Start Protectors
The fan does not utilize drive belts. Fan speed is variable via a As an option, STULZ offers spot type or strip/cable type water 0 to 10 VDC signal from the system controller. The fan motor detectors. -
Page 11: Free-Cooling Operation
CyberOne EC DX IOM Manual Free-cooling Operation If the return air temperature continues to rise, the free-cooling valve position eventually reaches 100% open, maximizing The free-cooling configuration is available to minimize the the flow of coolant through the free-cooling coil. Continued... -
Page 12: Aws Operation
CyberOne EC DX IOM Manual AWS Operation An AWS system utilizes an independent chilled water source to provide coolant to an AWS cooling coil in the A/C unit. If AWS cooling is unable to handle the load, the separate DX refrigeration circuit can be utilized to assist. -
Page 13: Installation
Any freight claims must be done through the freight carrier. STULZ ships all equipment FOB. STULZ can assist in the claim filing process with the freight carrier. Should any damage be present, notify STULZ Product Support prior to attempting any repairs. -
Page 14: Conditioned Space
CyberOne EC DX IOM Manual The vapor barrier is the single most important requirement for the pilot holes are located in the top of the cabinet. On a maintaining environmental control in the conditioned space. downflow configuration, they are located in the floor of the The vapor barrier in the ceiling and walls can be a polyethylene cabinet. -
Page 15: Precision A/C Unit
CyberOne EC DX IOM Manual NOTE installation drawing and cut out the raised floor to match the blower discharge opening(s) and cut out the holes required Placement of the floor or ceiling registers is for piping and wiring through the raised floor. -
Page 16: Upflow Configuration Air Patterns
CyberOne EC DX IOM Manual 2.4.2 Upflow Configuration Air Patterns If ductwork is to be installed, always consult your local and state codes when determining ducting requirements. The In an upflow configured unit, the conditioned supply air duct system should be designed to allow the air to move with has two methods of discharge: Ducted or through a 2- or as little resistance as possible. -
Page 17: Optional Equipment (Field Installed)
As an option, a 75 ft or 150 ft long Installed) cable may be provided by STULZ. Follow the steps below to Do not mount any optional equipment on the unit access mount the sensor. -
Page 18: Remote Water Detector
The remote water detector is normally placed on the sub-floor or in a field supplied auxiliary drain pan located beneath the 2.6.1 Refrigerant Piping unit. STULZ provides two types of water detectors: 2.6.1.1 Self-Contained Systems Spot type water detector-... - Page 19 CyberOne EC DX IOM Manual Wrap wet rags around the pipes between the areas to be brazed and any nearby refrigeration components to keep Recommended Discharge Line Sizes excessive heat from traveling through the pipe and causing * Equivalent Length in Feet Model No./ Total...
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Page 20: Remote Air Cooled Condensers (Ar)
The recommended ethylene glycol solution ratio is 40% unit for the location of the water supply connection. The glycol to 60% water. (STULZ recommends Dowtherm SR1 humidifier requires normal tap water for the water supply. If manufactured by Dow Chemical Co.) Use only ethylene glycol the supply water is high in particulate, an external filter may... -
Page 21: Utility Connections
CyberOne EC DX IOM Manual Figure 10. Condensate Pump CAUTION Do not use de-mineralized 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. -
Page 22: Single-Phase Units 208/230V
CyberOne EC DX IOM Manual per local and national electrical codes for service to the may be wired in a configuration, as recommended by the equipment. Do not mount a customer supplied manual fused manufacturer, to modify its electrical characteristics to those disconnect switch or HACR type circuit breaker to the surface of an autotransformer (buck/boost transformer). -
Page 23: Three-Phase Units
2.7.2 Controls terminations. STULZ offers a wide range of control features to solve 2.7.4 Air-Cooled Split Systems your air conditioning control/alarm requirements. If the The following system interconnecting field wiring diagrams system controller is mounted on the unit (standard), no utility detail the number of conductors required for a typical system. -
Page 24: Remote Condenser (Ar Models)
CyberOne EC DX IOM Manual the remote condenser/condensing unit electrical box. You must remove the jumper from the remote A separate equipment ground lug is provided within the condenser terminal board (see the condenser wiring electrical box for termination of the earth ground wire. Refer diagram). -
Page 25: Remote Condensing Unit (Ahu Models)
CyberOne EC DX IOM Manual 2.7.4.2 Remote Condensing Unit (AHU Models) 2.7.5 Glycol Systems (G Models) Systems equipped with a remote condensing unit require field Systems equipped with a glycol-cooled system/pump control wiring between the A/C system and the condensing package require field wiring between the glycol unit and... -
Page 26: System Charging Procedures
CyberOne EC DX IOM Manual System Charging Procedures The piping system must be cleaned prior to adding water/glycol to the system. 2.8.1 Water/Glycol Systems Glycol must be mixed with water before it is All self-contained water/glycol cooled units (units that added to the system. -
Page 27: Pump
CyberOne EC DX IOM Manual Open the vent valve at highest point of the system. CyberOne EC systems use R407Crefrigerant. Refrigerant Fill the system until the solution is discharging from charging pressures vary depending on the type of the vent with minimal signs of foaming due to air in the system. -
Page 28: Preparing System For Charging
Reheat and Hot Gas Bypass connected with a 1/2” x CAUTION 30 ft liquid line and 7/8” x 30 ft discharge line to a STULZ A proper vacuum must be drawn on the refrigerant Model SCS-060-SAA -30 °F condenser with flooded head system to remove moisture prior to charging. -
Page 29: Refrigerant Charging Procedures
CyberOne EC DX IOM Manual is not done the refrigerant charge will combine dry nitrogen. Allow the system to stand for two hours with with moisture in the pipes to form an acid that the dry nitrogen charge. This gives time for the nitrogen will eventually lead to compressor failure. -
Page 30: ºf Fan Cycling And -20 ºf Variable Speed Control
CyberOne EC DX IOM Manual Bleed air from hoses and break the vacuum by supplying Take a superheat temperature reading near the feeler liquid refrigerant (R407C) to the discharge port near bulb from the thermal expansion valve with the tempera- the compressor until the pressure is equalized. -
Page 31: Refrigerant Characteristics
CyberOne EC DX IOM Manual Add refrigerant charge until the refrigerant level in the R407A Refrigerant receiver rises to the center of the sight glass, indicating the receiver is 80% filled. Tempera- Pressure ture (ºF) (psig) When the refrigerant in the receiver reaches the center Saturated Evaporating of the sight glass, the unit is fully charged. -
Page 32: Head Pressure Controls-Air Cooled Systems
CyberOne EC DX IOM Manual The fan speed controller will automatically control the head R407C Pressure Switch Settings: pressure at a level to maintain design refrigerant discharge The high-pressure switch opens at 410 psig and has a manual pressures. On systems with more than one fan on the reset. -
Page 33: Flooded Head Pressure Control (Condenser Model Hes-Caa , -30 °F)
Adjustment is made by entering the low ambient operation thus ensuring proper condensing Factory menu in the E² controller. Contact STULZ Product temperature. The head pressure control valve requires no Support for a password to enter the Factory menu and for adjustment. -
Page 34: Hot Gas Bypass (Optional)
2.9.7.1 Snap Acting Hot Gas Bypass (Optional) counterclockwise to lower pressure. The two most common systems provided by STULZ for hot gas bypass are snap acting and full floating. The snap CAUTION acting hot gas bypass system provides some modulated Do not exceed 20 °F superheat. -
Page 35: Commissioning, Operation And Decommissioning
It should be especially at start-up). The compressor circuit will be completed during start-up and sent to STULZ. energized to begin the dehumidification process. While This checklist should be used as a guideline for in this mode, the room temperature may decrease and items that need to be confirmed during start-up. -
Page 36: Recovering Refrigerant
CyberOne EC DX IOM Manual Follow these decommissioning guidelines: Recovery equipment must be in good working order with a set of instructions concerning the a. Become familiar with the equipment and its opera- equipment at hand, and the equipment must be tion. -
Page 37: Maintenance
CyberOne EC DX IOM Manual 4.0 MAINTENANCE 4.1.1 CyberOne EC DX A/C Unit Check the refrigerant sight glass on a monthly basis while the unit is running and ensure it is free of bubbles. Bubbles in Periodic General Maintenance the sight glass indicate a low refrigerant charge or a clogged Systematic, periodic general maintenance of the CyberOne filter-drier. -
Page 38: Condensate Pump
CyberOne EC DX IOM Manual Troubleshooting changing the cylinder. Individual maintenance schedules must be determined for each location, based upon periodic Turn off all power to the unit before conducting any examination of the humidifier. A yellow LED on the humidifier troubleshooting procedures, unless the procedure cabinet will flash four times in a repeating pattern when the... - Page 39 CyberOne EC DX IOM Manual Symptom Probable Cause Recommendation Suction Pressure Too Low a. Loss of refrigerant (excessive bubbles in Locate leak and repair. Recharge system. sight glass). b. Expansion valve stuck or obstructed Remove and clean or replace valve.
- Page 40 CyberOne EC DX IOM Manual Symptom Probable Cause Recommendation Determine the cause of the interruption and Blower Fails to Start (Con’t) g. EC fan’s internal overheat protection Determine the cause of the interruption correct. Possible causes are: interrupted fan motor operation.
- Page 41 CyberOne EC DX IOM Manual Symptom Probable Cause Recommendation Noisy Compressor a. Expansion valve stuck in open position Ensure feeder bulb is tight on suction (abnormally cold suction line). line. Check operation and superheat. b. Worn or scarred compressor bearings.
- Page 42 CyberOne EC DX IOM Manual Symptom Probable Cause Recommendation Heater Inoperative a. Fuses blown. Check for short circuit, replace fuses. b. Temperature set too low. Increase temperature set point. c. Overheat switch open. Insufficient airflow across heater elements. Check for dirty filters or obstructions that may reduce airflow.
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Page 43: Field Service
CyberOne EC DX IOM Manual Field Service 4.3.4 General Common Repairs/Component Replacement NOTE 4.3.4.1 Compressor Failure Do not attempt to make repairs without the proper The compressor is the most important component of the air tools. conditioner. Numerous safety devices are provided to protect It may be necessary to perform repairs on the refrigeration the compressor from failing. -
Page 44: Standard Cleanout Procedure
CyberOne EC DX IOM Manual Install a suction line filter-drier designed for acid removal. CAUTIONS Remove the liquid line drier and install an oversized Damage to a replacement compressor caused liquid line filter-drier (one size larger than the normal by improper system cleaning constitutes abuse selection size). - Page 45 CyberOne EC DX IOM Manual Turn off the water supply to the humidifier. Turn the main power disconnect switch on the electric box to the Off position and open the door of the unit electric box. Use vise grips to turn the shaft of the main power switch to the On position to provide power for the humidifier...
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Page 46: Product Support
STULZ Sales Order Number returned repair/replacement parts, the parts must be returned Description of Problem to STULZ within 30 days of the purchase date. Spare part sales over 30 days old will be considered final and the parts will remain Obtaining Warranty Parts the sole property of the ordering party. -
Page 47: Installation Checklist
CyberOne EC DX IOM Manual Installation Checklist Tasks Comments Proper clearances for service access have been maintained around equipment. Equipment is level and mounting fasteners are tight. If required, piping completed to refrigerant or coolant loop. All field installed piping leak tested. - Page 48 CyberOne EC DX IOM Manual Maintenance Checklist Prepared by Model Number Title Item Number Date Serial Number Monthly Filters Fans Condensate Drain Fan(s) rotate Cleanliness Drain is open No obstructions Condensate pan safety switch operates freely Additional Check chilled water/hot water circuits for air (bleed as required)
- Page 49 CyberOne EC DX IOM Manual If you need technical support, call 888 529 1266 or email stulztechnicalsupport@stulz-ats.com. Support is available 24/7/365. Provide the model number, serial number, and STULZ item number from the unit nameplate. This will speed up the process and ensure accuracy.
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Page 50: Glossary
CyberOne EC DX IOM Manual Glossary Term Definition Term Definition American Society of Heating, Refrigerating, and ASHRAE Information Technology Air-Conditioning Engineers Installation, Operation, and Maintenance BTUH/Hr British Thermal Units Per Hour Manual Compact-CWE kilowatt Cubic Feet Per Minute Kilo Volt Amps... - Page 51 North American Headquarters STULZ Air Technology Systems, Inc. 1572 Tilco Drive | Frederick, MD 21704 301.620.2033 | Fax: 301.662.5487 | info@stulz-ats.com Technical Support: 888.529.1266 www.stulz-usa.com OCC0096A Feb. 2020 © STULZ Air Technology Systems, Inc. - Specifications subject to change without notice.
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