YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls

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SECTION 2 - PRODUCT DESCRIPTION Connection Location - The standard unit configuration is available with fluid inlet connections at rear (opposite control panel end) of unit. Option available for front fluid inlet on select configurations. Water Box Heater - The standard unit comes with freeze protection on the evaporator down to -17.8°C (0°F).The waterbox heater option provides additional freeze protection down to -28°C(-20°F). CONTROLS OPTIONS High Ambient Operation – This provides special control logic coupled with high airflow fans to permit high ambient up to 52°C (125°F) operation. Fans are airfoil type blades with high power motors. This option may also allow for increased machine capacity, allowing the selection of a smaller chassis to meet specific capacity requirements. Building Automation System Interface (Temperature) - Factory installed option to accept a 4 to 20mA or a 0 to 10VDC input to allow remote reset of the Leaving Chilled Liquid Temperature Setpoint. The setpoint can be positively offset upwards up to 22.2°C (40°F). This option is useful for ice storage or process applications or for periods where higher chilled liquid temperatures are adequate for low loads. Available alone or in combination with BAS Load Limit. Building Automation System Interface (Load Limit) - Factory installed option to accept a 4 to 20mA or a 0 to 10VDC input to allow remote reset of the Load Limit Setpoint. The setpoint can limit system demand from 30-100%. Available alone or in combination with BAS Temperature Reset. E-Link – The optional E-Link gateway provides communication between the equipment and Building Automation Systems, including BACnet (MS/TP), Modbus, LON and N2. Thermal Storage – Provides special control logic and modifications to produce leaving chilled brine temperatures below 4.4°C (40°F) primarily at times of low ambient temperatures (night time). Option can be used to produce ice to supplement cooling and significantly decrease energy costs. The capability of the chiller is enhanced by using both ice and chilled water simultaneously during times of peak cooling needs. GENERAL OPTIONS Flow Switch Accessory - Vapor proof SPDT, NEMA 3R switch, 10.3 barg (150 psig) DWP, -29°C to 121°C (-20°F to 250°F) with 1" NPT (IPS) connection for upright mount- 18 FORM 201.28-NM1.1 ISSUE DATE: 8/29/2012 ing in horizontal pipe. This flow switch or equivalent must be furnished with each unit. Field mounted. Differential Pressure Switch – This 0.2-3 barg (3-45 psig) range switch, with 1/4" NPTE pressure connections, is an alternative to the paddle-type flow switch. Field mounted. Service Isolation Valve – Service suction isolation valve added to unit for each refrigerant circuit. Dual Pressure Relief Valve – Two safety relief valves are mounted in parallel; one is always operational to assist in valve replacement during maintenance. Terminal Block [not available for CE marked units] – Terminal Block connections shall be provided at the point of incoming single point connection for field connection and interconnecting wiring to the compressors. Separate external protection must be supplied, by others, in the incoming power wiring, which must comply with local codes. Circuit Breaker – A unit-mounted circuit breaker with external lockable handle will be supplied to isolate the single point power voltage for servicing. The circuit breaker is sized to provide motor branch circuit protection, short circuit protection and ground fault protection for the motor branch-circuit conductors, the motor control apparatus and the motors. Non-Fused Disconnect Switch – Unit-mounted disconnect switch with external lockable handle can be supplied to isolate the unit power voltage for servicing. Separate external fusing must be supplied by the power wiring, which must comply with local codes. VIBRATION ISOLATION Elastomeric Isolation – This option is recommended for normal installations. It provides very good performance in most applications for the least cost. Field mounted. 25 mm (1") Spring Isolators – Spring and cage type isolators for mounting under the unit base rails are available to support unit. They are level adjustable. 25 mm (1") nominal deflection may vary slightly by applic ation. Field mounted. 50 mm (2") Restrained Spring Isolators – Restrained Spring-Flex Mounting isolators incorporate a rugged welded steel housing with vertical and horizontal limit stops. Housings designed to withstand a minimum 1.0g accelerated force in all directions up to 51 mm (2"). The deflection may vary slightly by application. They are level adjustable. Field mounted. JOHNSON CONTROLS
FORM 201.28-NM1.1 ISSUE DATE: 8/29/2012 DELIVERY AND STORAGE SECTION 3 - HANDLING AND STORAGE To ensure consistent quality and maximum reliability, all units are tested and inspected before leaving the factory. Units are shipped completely assembled and containing refrigerant under pressure. Units are shipped without export crating unless crating has been specified on the Sales Order. If the unit is to be put into storage, prior to installation, the following precautions should be observed: • The chiller must be “blocked” so that the base is not permitted to sag or bow. • Ensure that all openings, such as water connections, are securely capped. • Do not store where exposed to ambient air temperatures exceeding 43°C (110°F). • The condensers should be covered to protect the coils and fins from potential damage and corrosion, particularly where building work is in progress. • The unit should be stored in a location where there is minimal activity in order to limit the risk of accidental physical damage. • To prevent inadvertent operation of the pressure relief devices the unit must not be steam cleaned. • It is recommended that the unit is periodically inspected during storage. INSPECTION Remove any transit packing and inspect the unit to ensure that all components have been delivered and that no damage has occurred during transit. If any damage is evident, it should be noted on the carrier’s freight bill and a claim entered in accordance with the instructions given on the advice note. Major damage must be reported immediately to your local Johnson Controls representative. MOVING THE CHILLER Prior to moving the unit, ensure that the installation site is suitable for installing the unit and is easily capable of supporting the weight of the unit and all associated services. The units are designed to be lifted using shackles or safety hooks. A spreader bar or frame should be used in order to prevent damage to the unit from the lifting chains. (Refer to Figure 4 on Page 20 for hooks.) Units are provided with lifting eyes in the sides of the base frame, which can be attached directly using container lugs, shackles or safety hooks (see Figure 4 on Page 20 for proper lifting illustration). The unit must only be lifted by the base frame at the points provided. Never move the unit on rollers, or lift the unit using a forklift truck. Care should be taken to avoid damaging the condenser cooling fins when moving the unit. LIFTING WEIGHTS For details of weights and weight distribution, refer to the data shipped in the chiller information packet and unit nameplate. JOHNSON CONTROLS 19 3
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YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls

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