Carrier 19XL specifications

Page 32

High Discharge Temperature Control Ð If the discharge temperature increases above 160 F (71.1 C) (PSIO Software Version 09 and higher) or 180 F (82 C) (PSIO Software Version 08 or lower), the guide vanes are propor- tionally opened to increase gas ¯ow through the compressor. If the leaving chilled water temperature is then brought 5° F (2.8° C) below the control set point temperature, the con- trols will bring the chiller into the recycle mode.

Oil Sump Temperature Control Ð The oil sump tem- perature control is regulated by the PIC which uses the oil heater relay when the chiller is shut down.

As part of the pre-start checks executed by the controls, oil sump temperature is compared against evaporator refrig- erant temperature. If the difference between these 2 tem- peratures is 50 F (27.8 C) or less, the start-up will be delayed until the oil temperature is 50 F (27.8 C) or more. Once this temperature is con®rmed, the start-up continues.

PSIO SOFTWARE VERSION 08 AND LOWER Ð The oil heater relay is energized whenever the chiller compressor is off, and the oil sump temperature is less than 140 F (60 C) or sump temperature is less than the cooler refrigerant tem- perature plus 60° F (33.3° C). The heater is then turned off when the oil sump temperature is: 1) more than 160 F (71.1 C); or 2) the sump temperature is more than 145 F (62.8 C) and more than the cooler refrigerant tem- perature plus 65° F (36.1° C). The heater is always off dur- ing start-up or when the compressor is running.

PSIO SOFTWARE VERSION 09 AND HIGHER Ð The oil heater relay is energized whenever the chiller compressor is off and the oil sump temperature is less than 150 F (65.6 C) or the oil sump temperature is less than the cooler refrig- erant temperature plus 70° F (39° C). The oil heater is turned off when the oil sump temperature is either 1) more than 160 F (71.1 C); or 2) the oil sump temperature is more than 155 F (68.3 C) and more than the cooler refrigerant tem- perature plus 75° F (41.6° C). The oil heater is always off during start-up or when the compressor is running.

When a power failure to the PSIO module has occurred for more than 3 hours (i.e., initial start-up), the oil sump is heated to 100° F (56° C) above the evaporator refrigerant temperature or 190 F (88 C), whichever is lower. Once this temperature is reached, the oil pump will be energized for 1 to 2 minutes or until the oil sump temperature cools to below 145 F (63 C). The normal heating algorithm is now followed once ramp loading has been completed.

After a 3-hour power failure, the oil temperature must rise to the higher oil temperature. The controls will delay the start of the compressor until this temperature is met.

Oil Cooler Ð The oil must be cooled when the compres- sor is running. This is accomplished through a small, plate- type heat exchanger located behind the oil pump. The heat exchanger uses liquid condenser refrigerant as the cooling liquid. A refrigerant thermostatic expansion valve (TXV) regu- lates refrigerant ¯ow to control oil temperature entering the bearings. There is always a ¯ow of refrigerant bypassing the thermostatic TXV. The bulb for the expansion valve is strapped to the oil supply line leaving the heat exchanger and the valve is set to maintain 110 F (43 C).

NOTE: The TXV is not adjustable. Oil sump temperature may be at a lower temperature.

Remote Start/Stop Controls Ð A remote device, such as a time clock which uses a set of contacts, may be used to start and stop the chiller. However, the device should not be programmed to start and stop the chiller in excess of 2 or

3 times every 12 hours. If more than 8 starts in 12 hours occur, then an Excessive Starts alarm is displayed, prevent- ing the chiller from starting. The operator must reset the alarm at the LID in order to override the starts counter and start the chiller. If Automatic Restart After a Power Failure is not activated when a power failure occurs, and the remote con- tact is closed, the chiller will indicate an alarm because of the loss of voltage.

The contacts for Remote Start are wired into the starter at terminal strip TB5, terminals 8A and 8B. See the certi®ed drawings for further details on contact ratings. The contacts must be dry (no power).

Spare Safety Inputs Ð Normally closed (NC) digital inputs for additional ®eld-supplied safeties may be wired to the spare protective limits input channel in place of the factory- installed jumper. (Wire multiple inputs in series.) The open- ing of any contact will result in a safety shutdown and LID display. Refer to the certi®ed drawings for safety contact ratings.

Analog temperature sensors may also be added to the options modules, if installed. These may be programmed to cause an alert on the CCN network, but will not shut the chiller down.

SPARE ALARM CONTACTS Ð Two spare sets of alarm contacts are provided within the starter. The contact ratings are provided in the certi®ed drawings. The contacts are located on terminal strip TB6, terminals 5A and 5B, and terminals 5C and 5D.

Condenser Pump Control Ð The chiller will moni- tor the CONDENSER PRESSURE and may turn on this pump if the pressure becomes too high whenever the compressor is shut down. CONDENSER PRESSURE OVERRIDE is used to determine this pressure point. This value is found on the Equipment Service1 LID table and has a default value (Table 4). If the CONDENSER PRESSURE is greater than or equal to the CONDENSER PRESSURE OVERRIDE, and the ENTERING CONDENSER WATER TEMP (Temper- ature) is less than 115 F (46 C), then the condenser pump will energize to try to decrease the pressure. The pump will turn off when the condenser pressure is less than the pressure override less 5 psi (34 kPa), or the CONDENSER REFRIG (Refrigerant) TEMP is within 3° F (2° C) of the ENTERING CONDENSER WATER temperature.

Condenser Freeze Prevention Ð This control algorithm helps prevent condenser tube freeze-up by ener- gizing the condenser pump relay. If the pump is controlled by the PIC, starting the pump will help prevent the water in the condenser from freezing. Condenser freeze prevention can occur whenever the chiller is not running except when it is either actively in pumpdown or in Pumpdown Lockout with the freeze prevention disabled (refer to Control Test table, Pumpdown/Terminate Lockout tables).

When the CONDENSER REFRIG TEMP is less than or equal to the CONDENSER FREEZE POINT, or the ENTERING CONDENSER WATER temperature is less than or equal to the CONDENSER FREEZE POINT, then the CONDENSER WATER PUMP shall be energized until the CONDENSER REFRIG TEMP is greater than the CON- DENSER FREEZE POINT plus 5° F (2.7° C). An alarm will be generated if the chiller is in PUMPDOWN mode and the pump is energized. An alert will be generated if the chiller is not in PUMPDOWN mode and the pump is energized. If in recycle shutdown, the mode shall transition to a non- recycle shutdown.

32

Page 31 Page 33
Image 32
Page 31 Page 33
Contents Start-Up, Operation, and Maintenance Instructions Safety ConsiderationsContents Contents Introduction Abbreviations and ExplanationsMOTOR/OIL Refrigeration Cooling Cycle Chiller FamiliarizationRefrigeration Cycle 19XL Rear View Take-Apart Rabbet Fit Connector Cooler In/Out Temperature SensorsCondenser In/Out Temperature Sensors Cooler Pressure Schrader FittingLubrication Cycle Refrigerant Motor Cooling and Oil Cooling CyclesLubrication System Starting Equipment Unit-Mounted Solid-State Starter OptionalDenitions ControlsMajor PIC Components Panel Locations PIC Component Panel19XL Controls and Sensor Locations Pressure Transducer, TypicalPower Panel with Options Control and OIL Heater Voltage Selector S1Select LID Operation and Menus FigGeneral − Example of Point Status Screen Status01 Override OperationsExample of Time Schedule Operation Screen 19XL Menu Structure 19XL Service Menu Structure 19XL Service Menu Structure Setpoint Example of Set Point ScreenDescription Range Units Reference Point Name Alarm History LID ScreensExample 1 Ð STATUS01 Display Screen Menu Status SelectExample 2 Ð STATUS02 Display Screen Example 3 Ð STATUS03 Display ScreenExample 4 Ð Setpoint Display Screen MenuExample 5 Ð Configuration Config Display Screen Example 6 Ð LEAD/LAG Configuration Display ScreenECW Control Option ICE Build TerminationExample 7 Ð SERVICE1 Display Screen Example 8 Ð SERVICE2 Display Screen Spare Alert EnableExample 9 Ð SERVICE3 Display Screen Menu ServiceExample 10 Ð Maintenance MAINT01 Display Screen Example 11 Ð Maintenance MAINT02 Display ScreenDischarge Temperature Bearing TemperatureDescription RANGE/STATUS Units Reference Point Name Example 12 Ð Maintenance MAINT03 Display ScreenExample 13 Ð Maintenance MAINT04 Display Screen PIC System Functions Page Protective Safety Limits and Control Settings Capacity Overrides Page Page Lead/Lag Control ECWHgbp Hot Gas BypassPage Ice Build Control Cent CapacityPage Example of Attach to Network Device Screen To LOG onSTART-UP/SHUTDOWN/RECYCLE Sequence FigRecycle Restart Delta T Using the Optional Storage Tank and Pumpout Before Initial START-UPJob Data Required Equipment Required19XL Leak Test Procedures Page Ð HCFC-22 Pressure Ð Temperature F Ð HCFC-22 Pressure Ð Temperature CTemperature Pressure Ð HFC-134a Pressure Ð Temperature FÐ HFC-134a Pressure Ð Temperature C Page Inspect Wiring Check Optional Pumpout Compressor Water PipCheck Starter MECHANICAL-TYPE StartersBenshaw, Inc. Solid-State Starter Power Stack BENSHAW, INC. SOLID-STATE StarterPower Up the Controls and Check the Oil Heater Set Up Chiller Control CongurationLoad Surge Prevention Occurs TOO Soon Occurs TOO Late Amps Correction Factors For 19XL Motors Volt Motor CodeCharge Refrigerant into Chiller 19XL Chiller Equalization Without PUMP- OUT UnitControl Test Menu Functions Tests to be Devices Tested PerformedRefrigerant Charges 19XL Total Refrigerant ChargeCooler SizeCheck Rotation Initial START-UPDry Run to Test Start-Up Sequence Check Oil Pressure and Compressor Stop Calibrate Motor CurrentOperating Instructions Operator DutiesTo Stop the Chiller Plant Pumpout and Refrigerant Transfer Procedures Operating the Optional Pumpout CompressorTransfer Refrigerant from Storage Tank to Chiller TstatChillers with Isolation Valves Transfer the Refrigerant from Chiller to Storage TankReturn Refrigerant to Normal Operating Conditions General MaintenanceTest After Service, Repair, or Major Leak Ð If Weekly Maintenance Guide Vane Actuator LinkageTo Change the OIL Scheduled MaintenanceCheck Safety and Operating Controls Monthly Compressor Bearing and Gear Mainten Inspect the Heat Exchanger TubesOptional Pumpout System Controls Troubleshooting Guide MAINT01 MAINT02MAINT03 MAINT04Shutdown with ON/OFF/RESET-OFF Timing OUT or Timed OUTAutorestart in Progress Recycle ShutdownNormal or AUTO.-RESTART LOW Chilled Water Normal RUN with RESET, TEMPERATURE, or Demand Compressor Jumpstart and Refrigerant ProtectionLimited Normal RUN Overrides Active AlertsOUT-OF-RANGE Sensor Failures Chiller Protect Limit Faults Protective LimitChiller Alerts Spare Sensor Alert MessagesOther PROBLEMS/MALFUNCTIONS DESCRIPTION/MALFUNCTION Probable CAUSE/REMEDYÐ Thermistor Temperature F vs Resistance/Voltage Drop Temperature Voltage Resistance DropÐ Thermistor Temperature C vs Resistance/Voltage Drop Input Options Module Control ModulesModule Address Options Module Starter Management Module SMM FigProcessor Module Psio Fig Installation Switch Options Setting ModuleTypical Benshaw, Inc. Solid-State Starter internal View Page Page Benshaw, Inc. Solid-State Starter Troubleshooting Guide Problem Probable Causes Area of CorrectionRV1 SCRHeat Exchanger Data Additional Data for Marine WaterboxesCooler CondenserWaterbox Cover Weights CoolersCondensers 1034 kPaOptional Pumpout System Electrical Data Compressor/Motor WeightsCompressor Weights Compressor Fits and Clearances Compressor Assembly Torques Description TorqueFt-lb ``ZCLR COMComm EXTPage CLR Page Chiller Power Panel, Starter Assembly Motor Wiring Schematic Chiller Power Panel, Starter Assembly Motor Wiring Schematic PMR POTGFR HPSTypical Wye-Delta Unit Mounted Starter Wiring Schematic Index Index Copyright 1996 Carrier Corporation

19XL specifications

The Carrier 19XL is a highly regarded commercial heating and cooling solution, designed to provide optimum performance and energy efficiency in various applications. This rooftop unit is engineered to meet the diverse needs of businesses, making it an ideal choice for those requiring reliable climate control in their facilities.

One of the standout features of the Carrier 19XL is its advanced cooling and heating capabilities. The unit utilizes a high-efficiency scroll compressor that ensures a quieter operation and improved reliability. The system can operate across a wide range of temperatures, making it versatile for various climates. Additionally, it offers both cooling and heating options, allowing for year-round comfort.

Energy efficiency is a focal point of the 19XL design. With an impressive Seasonal Energy Efficiency Ratio (SEER) and Heating Seasonal Performance Factor (HSPF), this unit not only helps reduce energy costs but also supports environmental sustainability initiatives. The unit is equipped with environmentally friendly refrigerants, further contributing to lower greenhouse gas emissions.

The Carrier 19XL features a user-friendly control system, allowing for easy monitoring and management of the unit's performance. This control system is designed to maximize energy savings, offering features such as demand control ventilation and integrated economizers that facilitate the use of outdoor air for cooling, reducing reliance on mechanical systems when conditions allow.

Construction-wise, the Carrier 19XL is built to withstand tough environmental conditions. Its robust cabinet is made from galvanized steel, providing durability and protection against the elements. The design also includes insulation to minimize noise levels, creating a more comfortable indoor environment.

Maintenance is a key consideration in the design of the 19XL. The unit features accessible service ports and a simplified access panel, allowing technicians to perform routine maintenance with ease. This proactive design helps ensure the longevity of the system and minimizes downtime, keeping operations running smoothly.

In summary, the Carrier 19XL is an exceptional choice for commercial heating and cooling needs. With its energy-efficient features, advanced technology, and durable construction, it stands out as a reliable solution for businesses looking for sustainable climate control options.
Top Page Image Contents