Carrier 16JT Series Start Up & Operation Manual

Carrier 16JT Series Start Up & Operation Manual Manual pdf 42 page image

TROUBLESHOOTING GUIDE (cont)PROBLEM/SYMPTOM PROBABLE CAUSE REMEDYInadequate Purging(Low machine capacity andhigh absorber loss — seeAbsorber Loss Determination,page 31.)Air leakage in vacuum side of machine(high noncondensable accumulation rate)Have solution analyzed for indication of air leaks. Leak testand repair if necessary (see Noncondensable Accumu-lation Rate, Solution Analysis, and Machine Leak Testsections on pages 31, 34, and 31, respectively).Inhibitor depleted (high noncondensableaccumulation rate)Have solution analyzed. Add inhibitor and adjust solutionalkalinity if necessary (see Noncondensable AccumulationRate, Solution Analysis, and Inhibitor sections on pages 31,32, respectively).Purge valves not positioned correctly Check valve positions (see Purge Manual Exhaust Proceduresection on page 31).Purge solution supply lines crystallized(not able to exhaust purge)Heat solution supply lines (see Purge Manual Exhaust proce-dure and Solution Decrystallization sections on pages 31and 40).Solution Crystallization DuringOperation(Strong solution overflowpipe hot.)Cycle-Guard™ control malfunction(solution overconcentration)Check refrigerant charge, thermoswitch calibration, andtransfer valve operation. (see Refrigerant Charge Adjust-ment, Cycle-Guard System Operation, and ThermoswitchAdjustment sections on pages 35, 35, and 36, respectively).Noncondensables in machine(high absorber loss)Check absorber loss (see Absorber Loss Determinationsection on page 31). If above 5° F (2.8° C), see Causes andRemedies under Inadequate Purging above.High steam pressure or hot watertemperature (above design)See Machine Selection Data provided with the machine.Set at design.Absorber tubes fouled(poor heat transfer)Clean tubes. Determine if water treatment is necessary.Octyl alcohol depletion Check solution sample and add octyl alcohol if necessary(see Adding Octyl Alcohol section on page 35).Solution Crystallization atShutdown(Crystallization symptoms whenmachine is started.)Insufficient solution dilution at shutdown After shutdown, restart machine and measure concentrationof weak solution (see Solution or Refrigerant Sampling sec-tion on page 34). If above 56%, check dilution level switch andCycle-Guard transfer valve.Abnormal Noise fromSolution PumpCavitation of solution pump(low solution level in absorber)Open the Cycle-Guard valve manually (toggle switch43-RV) for about 3 minutes while machine is running.Abnormal Noise fromRefrigerant PumpTemperature of cooling watersupply below 59 F (15 C).Raise cooling water temperature above 59 F (15 C). Stopthe machine and then restart it about 20 minutes later.Frequent Cycle-GuardOperationFouled absorber or evaporator tubes Clean tubes.Excessive noncondensable gas(high absorber loss)See Inadequate Purging.Refrigerant overcharge or tube leak. Remove refrigerant to trim charge, per start-up instructions.Repair tube leak.42

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