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b. The control system shall detect conditions that approach protective limits and take self- corrective action prior to an alarm occur- ring. The system shall automatically reduce chiller capacity when any of the following parameters are outside their normal operat- ing range: 1) high condenser pressure 2) high motor temperature 3) low evaporator refrigerant temperature 4) high motor amps. c. During the capacity override period, a pre- alarm (alert) message shall be displayed informing the operator which condition is causing the capacity override. Once the condition is again within acceptable limits, the override condition shall be terminated and the chiller shall revert to normal chilled water control. If during either condition the protective limit is reached, the chiller shall shut down and a message shall be displayed informing the operator which condition caused the shutdown and alarm. d. Internal built in safeties shall protect the chiller from loss of water flow. Differential pressure switches shall not be allowed to be the only form of freeze protection. 3. Diagnostics and Service: A self diagnostic controls test shall be an inte- gral part of the control system to allow quick identification of malfunctioning components. Once the controls test has been initiated, all pressure and temperature sensors shall be checked to ensure they are within normal oper- ating range. A pump test shall automatically energize the chilled water pump, condenser water pump, and oil pump. The control system shall confirm that water flow and oil pressure have been established and require operator confirmation before proceeding to the next test. A guide vane actuator test shall open and close the guide vanes to check for proper oper- ation. The operator manually acknowledges proper guide vane operation prior to proceed- ing to the next test. In addition to the automated controls test, the controls shall provide a manual test which per- mits selection and testing of individual control components and inputs. A thermistor test and transducer test shall display on the CVC screen the actual reading of each transducer and each thermistor installed on the chiller. All out-of- range sensors shall be identified. 4. Multiple Chiller Control: The chiller controls shall be supplied as stan- dard with a two chiller lead/lag and a third chiller standby system. The control system shall automatically start and stop a lag or second chiller on a two chiller system. If one of the two chillers on line goes into a fault mode, the third standby chiller shall be automatically started. The two chiller lead/lag system shall allow man- ual rotation of the lead chiller, include load bal- ancing if configured, and a staggered restart of the chillers after a power failure. G. Electrical Requirements: 1. Electrical contractor shall supply and install main electrical power line, disconnect switches, circuit breakers, and electrical protection devices per local code requirements and as indi- cated necessary by the chiller manufacturer. 2. Electrical contractor shall wire the chilled water pump, condenser water pump, and tower fan control circuit to the chiller control circuit. 3. Electrical contractor shall supply and install electrical wiring and devices required to inter- face the chiller controls with the building control system if applicable. 4. Electrical power shall be supplied to the unit at the voltage, phase, and frequency listed in the equipment schedule. H. Piping Requirements — Instrumentation and Safeties: Mechanical contractor shall supply and install pres- sure gages in readily accessible locations in piping adjacent to the chiller such that they can be easily read from a standing position on the floor. Scale range shall be such that design values shall be indi- cated at approximately mid-scale. Gages shall be installed in the entering and leaving water lines of the cooler and condenser. I. Vibration Isolation: Chiller manufacturer shall furnish neoprene isolator pads for mounting equipment on a level concrete surface. J. Start-up: 1. The chiller manufacturer shall provide a factory- trained representative, employed by the chiller manufacturer, to perform the start-up proce- dures as outlined in the Start-up, Operation and Maintenance manual provided by the chiller manufacturer. 2. Manufacturer shall supply the following literature: a. Start-up, operation and maintenance instructions. b. Installation instructions. c. Field wiring diagrams. d. One complete set of certified drawings. 37PDF Image | Carrier Product Data 19XR,XRV High-Efficiency Hermetic Centrifugal Liquid Chiller 50/60 Hz HFC-134a 19XR — 200 to 1500 Nominal Tons (703 to 5275 kW) 19XRV — 200 to 800 Nominal Tons (703 to 2813 kW)
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Carrier Product Data 19XR,XRV High-Efficiency Hermetic Centrifugal Liquid Chiller 50/60 Hz HFC-134a 19XR — 200 to 1500 Nominal Tons (703 to 5275 kW) 19XRV — 200 to 800 Nominal Tons (703 to 2813 kW)Original File Name Searched:
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