Carrier 16JT Series Start Up & Operation Manual

Carrier 16JT Series Start Up & Operation Manual Manual pdf 41 page image

TROUBLESHOOTING GUIDEPROBLEM/SYMPTOM PROBABLE CAUSE REMEDYMachine Will Not Start orShuts Down(Panel RUN light out,pumps off.)No power to control panel Check for building power failure. Check main circuitbreaker.Control panel fuse blown Examine circuits for ground or short.Replace fuse.Control panel main circuit breaker open Close main circuit breaker.Control panel switches not set correctly Depress Stop button after safety shutdown.Place capacity control and Cycle-Guard™ selectionsin AUTO. and depress Start button.Chilled water or condensing water pumpoverloads or flow switches openCheck chilled water and condensing water pumps,starters and valves.Solution pump overloads open Push overload reset button. Measure pump dischargepressure to check for solution crystallization(see Solution Decrystallization section on page 40).Refrigerant pump overloads open Push overload reset button.Low temperature cutout Depress Start button after chilled water has warmedat least 7° F (4° C). Measure chilled water temperature.Recalibrate or replace switch if temperature is aboveset point. Check capacity control setting and operationif temperature is below switch setting (see CheckCapacity Control Operation section on page 23).High generator solution temperatureor pressure, high absorber pressure.Check cooling water temperature and flow.Check absorber pressure.Leaving Chilled Water TemperatureToo High(Machine running, chilled watertemperature above design.)Steam control valve not open Verify capacity control is positioned at AUTO.Check capacity control operation per Initial ControlCheckout and Adjustment section, pages 22-24.Set point too high Reset temperature control in control panel.Excessive cooling load (machineat capacity)Check for cause of excessive load.Excessive chilled water flow(above design)Check pressure drop per selection data and reset flow.Low condensing water flow (below design) Check pressure drop per selection data and reset flow.High supply condensing watertemperature (above design)Check cooling tower operation and temperature controls.Low steam pressure (below design) Raise to design per selection data.Inadequate steam condensate drainage(condensate backs up into tube bundle)Check operation of steam traps, strainers, valves, andcondensate receivers.Fouled tubes (poor heat transfer) Clean tubes. Determine if water treatment is necessary.Machine needs octyl alcohol Check solution sample and add octyl alcohol if necessary(see Adding Octyl Alcohol section on page 35).Noncondensables in machine Check absorber loss (see Absorber Loss Determinationsection on page 31). If above 5° F (3° C), see Causes andRemedies under Inadequate Purging (high absorber loss)section on page 42.Capacity control malfunction Check calibration and operation of capacity controls (seeCheck Capacity Control Operation section on page 23).Solution crystallization(solution flow blockage)See Causes and Remedies under Solution Crystallizationon page 42.Low refrigerant level Check the low-level switch operation and check for lowcondensing water temperature.Cycle-Guard control malfunction(low solution concentration)Check refrigerant charge and thermoswitch calibration.(See Refrigerant Charge Adjustment, Cycle-Guard Sys-tem Operation and Thermoswitch Adjustment sectionson pages 35 and 36). Verify Cycle-Guard switch in AUTO.Leaving Chilled WaterTemperature Too Low(Machine running, chilled watertemperature below design.)Set point too low Reset temperature control in control panel.Capacity control malfunction Check calibration and operation of capacity control (seeCheck Capacity Control Operation section on page 23).Leaving Chilled Water TemperatureFluctuates(Machine running, capacitycontrol hunting.)Chilled water flow or load cycling Check chilled water system, controls and load.Condensing water flow or temperaturecyclingCheck condensing water temperature control andcooling tower operation.Steam pressure cycling Check steam pressure control.Inadequate steam condensate drainage(condensate backs up into tube bundle) Check operation of steam traps, strainer, valves,and condensate receivers.Capacity control malfunctions Check calibration and operation of capacity control (seeCheck Capacity Control Operation section on page 23).41

/ 44

Related manuals for Carrier 16JT Series