Related Manuals for Seresco CWT Series
Summary of Contents for Seresco CWT Series
- Page 2 December 2024...
- Page 3 Table of Content General Information Operating Safety • • Reference and Additional Information Contact Us • Special Considerations for Equipment Containing A2L Refrigerant • Basic Information Dehumidifier View and Options Dehumidifier External Systems Connection Pool Water Heating Options – Bonding Air Conditioning Options –...
- Page 4 General Information This manual provides basic information about the applicable dehumidifier and its operation. • This manual covers details of the equipment of various design, size, capacity etc.; therefore, some details covered in this manual may not be relevant to each piece of equipment. Refer to your equipment’s submittal documentation.
- Page 5 Note CAUTION WARNING Indicates a situation that could Indicates a potentially hazardous Indicates a potentially hazardous result in equipment damage or situation which could result in situation which could result in improper/ineffective operation if serious injury or death if handled moderate injury or equipment handled improperly.
- Page 6 DECOMMISSIONING tasks (related to install, repair and/or disposal of mechanical and refrigeration equipment, ductwork, piping, electrical), formal training in respective field and/or trade licensing may be required, issued by local or national authorities. Contact Us Seresco 1-833-DAS-POOL (327-7665) 5685 Cypihot Street, Schedule / Modify a Start-up: Saint-Laurent, QC H4S Startups@DehumidifiedAirServices.com...
- Page 7 Special Considerations for Equipment, Containing A2L Refrigerant Attention: Equipment Containing A2L Refrigerant CAUTION! Dehumidifier, equipped with compressors, contains A2L (mildly flammable) group refrigerant. Such equipment placement shall satisfy certain requirements of local and national Codes and Regulations, such as UL 60335/SCA B52/ASHRAE 15 and others, as applicable. Review following chapter in detail prior to placement of the equipment to ensure the requirements are met.
- Page 8 Basic Information Dehumidifier View and Options Pic. C.1 December 2024...
- Page 9 Standard dehumidifiers of this series are semi-custom: while basic concept and layout is the same, options and specific systems and components layout and location may vary from one dehumidifier to another. One of the typical dehumidifier arrangement is shown on Pic.C.1. Dehumidifier Options •...
- Page 10 Dehumidifier External Systems Connection Pic. C.1 shows provisions for external systems connections, including ductwork, electric power and control wires and various piping connections. CAUTION! Current manual shows general/default connections’ location. For details regarding specific dehumidifier’s connections (actual location, piping sizes and position dimensions, circuit type and flow direction etc.), refer to the dehumidifier’s submittal documentation as well as dehumidifier’s labels and stickers.
- Page 11 Pool Water Heating Option – Bonding Pool Equipment Bonding The dehumidifier shall be bonded to the pool bonding and grounding system through the wiring lug installed for this purpose (example shown in the picture below). One side of the lug is connected internally to the pool water heat exchanger.
- Page 12 Pic. C.4 December 2024...
- Page 13 Equipment Technical Data Detailed information about specific equipment is presented in submittal documentation; some general info is provided below: Air Data ESP Min 0.5” wc ESP Max 3” wc Leaving Air Temperature max 120 F Heating Water Data Pressure, MAX 250 psi Entering Water Temperature MAX 180 F...
- Page 14 Layout and Components The general layout and components location is the same for all dehumidifiers of current type, however some may vary, based on the dehumidifier’s specific options – refer to submittal documentation. Pic. D.1 below shows all/most available options, some of which may not be present on your dehumidifier. Dehumidifier Main Components Main Blower (1) is a supply fan array located at the end of the unit.
- Page 15 Pic. D.1 December 2024...
- Page 16 Compressor Wall (10 - detailed further below; see Pic.D.1C). • Pic. D.1C Each compressor module contains a Compressor (13), Plate heat exchanger (14), Evaporator Coil (15), and other refrigeration components to complete a self-contained refrigerant circuit within each module. Each module also includes a Control Module (17). Common to the compressor modules is the Glycol Pump (16a), that circulates water/glycol to reject compressor-generated heat.
- Page 17 Control sub-panel with Main Control Board (17) and Operator Panel (18) is normally mounted on the compressor stand frame. Main Electric Panel (2) contains main • blower(s) VFD (variable frequency drive) (78), main Disconnect (77), if one is installed, and other electrical and control components (contactors, fuses, control transformer etc.).
- Page 18 SA temperature sensor of dehumidifier, equipped with gas heater, would be composed of four regular temperature sensors, installed in different points at supply duct connection, averaging temperature reading. If the dehumidifier is equipped with the pool heating option, the Pool Water Temperature sensors (Pool In •...
- Page 19 Cooling (AC) coils (31) (where heat from glycol mixture is rejected to the ambient air) is mounted onto metal • frame, upstream (before) the fans (32), that pulls the air through the coils to absorb the heat. Normally, fluid cooler would have multiple coils and fans. Cooler NG-V-12 (Fig.1), comprised of two coils, mounted on the angle to each other, and two fans, presents a single block.
- Page 20 Sequence of Operation The dehumidifier’s ventilation system establishes the required airflow through the dehumidifier. The control system compares air temperature and humidity to their desired values (set points) and proceeds to dehumidify, cool or heat the recirculating air. If the dehumidifier is equipped with the pool water heating option, the pool water temperature is compared to its set point and pool heating is provided if required.
- Page 21 Heat Recovery Option. Dehumidifiers, packaged with Minimum Exhaust Fan and Minimum Outdoor Air damper, could also have additional Heat Recovery (HR) closed-loop glycol system. Heat Recovery loop (see Pic. E.1 below) consists of two coils (air-to-glycol heat exchangers) and a pump, establishing glycol circulation between them.
- Page 22 Compressor(s) Whenever the compressor operates, the evaporator is always dehumidifying and cooling the return air. The heat removed from the air at the evaporator, as well as the heat from the compressor's action, must be rejected to one of three heat sinks: room (premise) air, pool water (if applicable) or outdoors. The control system will direct the heat to where it is needed based on room (air and pool water temperature) conditions: •...
- Page 23 A2L Refrigerant Mitigation Control Dehumidifiers, that contain A2L (mildly flammable) refrigerant (like R454B), employ additional mechanisms (devices and control algorithm) to ensure the safety in event of refrigerant leak. Initial Ventilation Design and Emergency Venting Danger of explosion of A2L refrigerant would occur if its concentration in the air would be above certain level. To ensure that said concentration is never reached, safety consideration is embedded at the design and selection of the dehumidifier for respective premise: ...
- Page 24 Interface and Communication Touch Display Operator Panel The Touch Display Operator Panel (OP), shown on Pic. F.1, is used as a main interface between the dehumidifier and operator. The same OP can be located in the dehumidifier main electric panel (default; used as a local OP) or installed remotely from the dehumidifier •...
- Page 25 Alarms If the dehumidifier control system detects abnormal or unsafe for further operation situation, it issues Alarm (notification of such situation accompanied by respective component or entire dehumidifier stoppage and/or lockout) or Alert (notification of minor abnormal situation without any devices’ stoppage or lockout). All alarms and alerts are recorded and can be viewed/cleared via the Touch Display OP: ...
- Page 26 Remote Communication Although dehumidifier is designed to operate as a self-controlled device (not requiring any external control), communication between the dehumidifier and external control and monitoring systems is possible. WebSentry WebSentry is an online tool (also referred to as Web Monitor), that allows for remote communication to the dehumidifier for various purposes such as monitoring, data collection, parameters adjustment, and notifications.
- Page 27 General Considerations for any Work, Performed on the Equipment Whether performing routine, day-to-day maintenance or one-off (commissioning, repair etc.) work tasks, one must recognize potential hazards, associated with the task to be performed, equipment and its installation specifics, as well as be properly trained and qualified to perform such tasks (for training and qualification requirements – refer to chapter “Personnel Training and Qualification”).
- Page 28 Mechanical room, where dehumidifier is installed, and dehumidifier installation must comply with requirement CSA B52/ASHRAE 15 for MACHINERY ROOMS. Requirements include, but not limited to, following (refer to respective Code): Machinery room shall be of a tight construction and not accessible to general public. ...
- Page 29 Basic Maintenance Although Seresco equipment is built for minimal service downtime, periodic preventative maintenance is required to ensure maximum reliability, safety, and operating efficiency. WARNING! To ensure equipment longevity and proper and efficient operation, the dehumidifier and its auxiliary systems and devices (outdoor condenser, fluid cooler, boiler package, etc.) must be maintained properly and regularly.
- Page 30 Routine Maintenance Program Creating facility-specific routine maintenance program and following it is vital to equipment longevity and efficient operation. The suggested general maintenance operations and their frequency/intervals, listed in the table M-1 below, can be used to create such a program. For more detailed maintenance recommendations related to specific components, refer to the respective component manufacturer’s manual.
- Page 31 Specific Components Maintenance Actual maintenance plan may vary from installation to installation, yet there are several key components from maintenance prospective. If needed, contact respective component manufacturer for additional maintenance information. RDS Sensor (Equipment with A2L refrigerant) Refrigerant sensor, installed within the dehumidifier, does not require any specific maintenance. Used sensor has long-life expectancy and not required to be replaced on regular basis.
- Page 32 Special Maintenance Tasks. Fluid Cooler Winterization. Normally fluid coolers are used in the systems, filled with glycol mixture to prevent the system and the fluid cooler from freezing and, potentially, rupturing, when exposed to temperatures below freezing point. When fluid cooler is used with media that, when exposed to low temperatures, could freeze (water or lower- percentage glycol mixture), one way to protect the equipment is to drain it (also known as “winterization”...
- Page 33 Service, Repair, Commissioning and Decommissioning WARNING! Review and follow details in chapter “Work Tasks and Safety – General Considerations” in addition to current chapter to ensure safety of performed tasks! In some instances, more intrusive/specific work tasks (apart from routine maintenance) required. Apart from standard best field practices and Codes and regulations, applicable to respective tasks, it is critical to consider some equipment and its installation-specific details.
- Page 34 – that capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking; – that no live electrical components and wiring are exposed while charging, recovering or purging the system. – that there is continuity of earth bonding •...
- Page 35 A2L Refrigerant Leak Detection Methods. WARNING! It is prohibited to use potential sources of ignition to search for refrigerant or for detection of refrigerant leaks! A halide torch (or any other detector using a naked flame) shall not be Acceptable (for A2L refrigerant) leak detection methods include: “Bubble”...
- Page 36 • hoses, recovery machine, cylinders were not being used with other refrigerants/oils to prevent cross-contamination • all tools in good order - cylinders are equipped with shut-off and pressure relief valve in good order, hoses with leak-free disconnects etc. • proper/correct number and type of cylinders available - of sufficient type for recovery and sufficient size/capacity to contain all recovered refrigerant •...
- Page 37 Email: Warranty@DehumidifiedAirServices.com Seresco warrants as set forth and for the time periods shown below that it will provide through either a DASV Service Technician or an authorized service organization specified and approved by DASV, a new or rebuilt part to replace a factory installed part which has failed because of defect in workmanship or material.
- Page 38 Replacement Part Warranty If a replacement part provided by Seresco under this warranty fails due to a material defect prior to the end of the Two-Year Parts Warranty (or the end of the extended warranty period if applicable), whichever comes first, Seresco will provide a new or rebuilt part F.O.B.
- Page 39 2. Optional Five-Year Dehumidifier Coil Warranty Subject to the terms above, Seresco will provide a replacement coil for up to 60 months from the date of the warranty activation. Extended coil warranties are for parts of the dehumidifier only and does not cover parts of dry cooler or OACC coils.
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