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Carrier 16JT Series, Start Up & Operation Manual

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Carrier 16JT Series Start Up & Operation Manual Download Page 12

Fig. 10 — Typical Wiring Diagram (cont)

12

Summary of Contents for 16JT Series

Page 1: ...uum or pressurized condition NEVER APPLY an open flame or live steam to a refrigerant cylinder Dangerous overpressure can result When neces sary to heat a cylinder use only warm 110 F 43 C water DO NOT REUSE disposable nonreturnable cylinders or at tempt to refill them It is DANGEROUS AND ILLEGAL When cylinder is emptied evacuate remaining gas pressure loosen the collar and unscrew and discard the...

Page 2: ...nary Check 25 PREPARATION Page Final Adjustment of Capacity Controls 25 WITH THE MANUAL PROCEDURE WITH THE AUTOMATIC PROCEDURE Final Refrigerant Charge Adjustment 25 Check Machine Shutdown 27 Check Low Evaporator Level Operation 27 Determine Noncondensable Accumulation Rate 27 OPERATING INSTRUCTIONS 27 30 Operator Duties 27 Before Starting Machine 27 Start Machine 27 Start Up After Limited Shutdow...

Page 3: ...where it is heated directly from high pressure steam for reconcentration The other half of the solution flows to a low temperature vessel low stage where it is heated for reconcentration by hot wa ter vapor released in the high temperature vessel The low stage acts as the condenser for the high stage so the heat energy first applied in the high stage vessel is used again in the low stage vessel Th...

Page 4: ...anel 6 Solution Heat Exchanger 7 Absorber 8 Evaporator Fig 1 Typical Machine Components 16JT810 880 2 1 8 7 3 4 5 6 LEGEND 1 High Stage Generator 2 Low Stage Generator 3 Condenser 4 Purge Storage Chamber 5 Control Panel 6 Solution Heat Exchanger 7 Absorber 8 Evaporator Fig 2 Typical Machine Components 16JT080 150 080L 150L 4 ...

Page 5: ...13 J Loop Box 14 Purge Exhaust Valve 15 Purge Solution Return Line 16 Purge Solution Return Valve 17 Control Panel 18 Low Temperature Heat Exchanger 19 Strong Solution Line to Absorber 20 Absorber Waterbox 21 Evaporator Waterbox 22 Condenser Waterbox 23 Condensate Drain Heat Exchanger 24 Condensate Drain Outlet 25 Condensate Drain Trap 26 High Temperature Generator Shell 27 Steam Box 28 Solution P...

Page 6: ...both a high temperature heat exchanger and a low temperature heat exchanger Solution to and from the low stage generator passes through only the low temperature heat exchanger mixed with the high stage generator solu tion This heat transfer improves solution cycle efficiency by preheating the relatively cool weak solution before it enters the generators and precooling the hotter strong solution be...

Page 7: ...ints 1 through 13 The corresponding values for these typical points are listed in Table 2 Note that these values will vary with different loads and operating conditions Point 1 represents the strong solution in the absorber as it begins to absorb water vapor after being sprayed from the absorber nozzles This condition is internal and cannot be measured Point 2 represents the diluted weak solution ...

Page 8: ...d Point 13 represents the strong solution leaving the low temperature heat exchanger and entering the absorber spray nozzles after being mixed with some weak solution in the heat exchanger The temperature can be measured but the concentration cannot be sampled After leaving the spray nozzles the solution is somewhat cooled and concentrated as it flashes to the lower pressure of the absorber at Poi...

Page 9: ...torage tank where they are isolated from the rest of the machine The storage chamber is initially filled with solution that is dis placed as the chamber gradually fills with noncondensables These gases then must be periodically exhausted from the storage chamber by a manual procedure This is begun by closing a solution return valve to force solution from the pump into the chamber to compress the n...

Page 10: ...Absorber Solution High Temperature Limit 26SP1 Solution Pump No 1 Motor High Temperature Limit 26SP2 Solution Pump No 2 Motor High Temperature Limit 26SSP Solution Spray Pump Motor High Temperature LImit 30X1 2 Safety Stop Interlock Relays 33RD Refrigerant Dilution Level Switch 33RH Refrigerant High Level Switch 33RHX Refrigerant High Level Relay 33RL Refrigerant Low Level Switch 33RM Refrigerant ...

Page 11: ...Fig 10 Typical Wiring Diagram 11 ...

Page 12: ...Fig 10 Typical Wiring Diagram cont 12 ...

Page 13: ...Fig 11 Typical Control Wiring 13 ...

Page 14: ...larm buzzer BZ The 4X relay also switches the Cycle Guard valve 20RV to automatic level switch control and releases the capac ity control valve from the closed position However the load limiter relay LIX is initially deenergized keeping the valve at a mid open position for a soft start After about 15 minutes time delay relay 62T3 contacts close to en ergize LIX releasing the capacity control valve...

Page 15: ... Run Light OL1 Chilled and Cooling Water Fault Indicator Light OL2 Refrigerant and Solution Pump Fault Indicator Light OL3 High Stage Generator Fault Indicator Light RL Stop Light Fig 14 Typical Control Sequence Normal Start 15 ...

Page 16: ...r dilution The refrigerant pump and Cycle Guard valve continue to be energized until the evaporator refrigerant drops to the dilution level switch which opens to deenergize the refrigerant pump delay start timer 62T2 The normally open timer con tacts then stop the Cycle Guard valve and refrigerant pump Normally open 1X1 contacts transferred control of the 62T2 timer from the evaporator low level s...

Page 17: ... through 4Y self latching contacts 5 The 30X1 contacts open to deenergize start relays 1X1 and 1X2 To begin the shutdown sequence normally closed 1X1 contacts turn the Stop light RL on 6 The 2X run relay remains energized as does the Run light GL If the chilled water pump is tied into the chiller control circuit for auto start stop the 2X relay will keep it running unless it has stopped on its own...

Page 18: ...o longed Cycle Guard operation the chiller control circuit over rides the signal to the steam valve to limit the valve opening The 16JT is available with either electronic or pneumatic capacity control valve actuators but both are positioned by a microprocessor based controller A temperature sensor inserted in the chilled water outlet pipe continuously measures chilled water temperature and provid...

Page 19: ...when the 33RHX level relay energizes for Cycle Guard operation Also 33RHX relay contacts open to drive the capacity con trol valve to a mid open position LIX to reduce heat sup ply to the generator until the high level has been corrected The concentrations at which the Cycle Guard valve is ac tivated are determined by the amount of refrigerant that is charged into the machine This charge should be...

Page 20: ...ps auto start if used etc Do not apply power to hermetic pumps or attempt to start the machine until it has been charged with lithium bromide solution and refrigerant The pumps will be se verely damaged if rotated without the full liquid charge 1 Examine wiring for conformance to job wiring diagrams and applicable electrical codes 2 Check pump and motor nameplates and control panel for agreement w...

Page 21: ...at the tools wih a light film of oil to prevent rust After emptying metal containers of solution rinse the container with fresh water to prevent corrosion Immedi ately wipe or flush the floor if lithium bromide or octyl al cohol is spilled on it Lithium bromide should be stored only in the original con tainer or in a completely clean container Used lithium bro mide solution should be disposed of b...

Page 22: ... motor at secondary starter terminals Wrap the ends of the disconnected wires with electrical tape and mark for proper identification at reinstallation 3 If starters for condensing water pump and chilled water pump are operated by manual start stop temporarily place an insulated jumper between terminals P1 and P2 to over ride the external interlock Remove fuses from starters for the condensing wat...

Page 23: ...mm Hg G 0 8 in Hg and closed switch contacts The switch range is 500 mm Hg G 20 in Hg to 580 kPa 85 psig NOTE The switch operation setting cannot be easily checked in the field without breaking machine vacuum It re quires a precise scale adjustment so do not reposition if not necessary Check Rotation of Solution and Refrigerant Pumps 1 Place main circuit breaker in OFF position and reconnect pump ...

Page 24: ...t the capacity control valve will open and close in proportion to the output signal OUT over its entire range OUT is displayed as 0 0 to 100 0 of the 4 to 20 mA output control signal 4a Return the controller to theAUTOMATIC mode by press ing the AUTO MAN button until A is displayed b Use the arrows to change the temperature set point SP close to the actual temperature on the upper display and wait...

Page 25: ...red for control stability with typical applications However if necessary the parameters can be adjusted for improved stability with either manual or automatic recon figuration procedures WITH THE MANUAL PROCEDURE the configuration for proportional band rate and reset are adjusted until the sys tem is stable WITH THEAUTOMATIC PROCEDURE the controller has AUTOTUNE capability to automatically calcula...

Page 26: ...Fig 22A Equilibrium Diagram for Lithium Bromide in Solution F Fig 22B Equilibrium Diagram for Lithium Bromide in Solution C 26 ...

Page 27: ...completed a normal shutdown 1 Depress the Start button to start the machine Place the capacity control AUTO MAN button in MAN and use Ä to keep the valve closed 2 Wait 5 minutes for the refrigerant pump to start then place the Cycle Guard switch in MANUAL to transfer refrig erant from the evaporator lowering the refrigerant level until it reaches the low level switch The refrigerant pump should st...

Page 28: ...ion section page 33 An alternative procedure is to limit steam pressure so that low stage generator strong solution temperature remains below 140 F 60 C while machine purge removes the noncondensables 4 When absorber loss is reduced to 5 F 3 C or less place capacity control switch in AUTO position return steam pressure to normal and allow purge to establish the nor mal 2 F 1 C or less absorber los...

Page 29: ...WN SAFETY SYMBOL RELAY DILUTION INDICATOR Low chilled water flow below 50 69CW CWX No LD1 Low chilled water temperature below 36 F 2 C 26CW CWX No LD1 Chilled water pump auxiliary contact 88EP CWX No LD1 Cooling water pump auxiliary contact 88CP CWX No LD1 Solution pump motor high temperature 26SP 26MX No LD2 Refrigerant pump motor high temperature 26RP 26MX No LD2 Solution pump motor current over...

Page 30: ... Condensate Leaving Water Temperature REFRIG ERANT Pump Discharge Temperature Specific Gravity High Stage Vapor Condensing Temperature Low Stage Vapor Condensing Temperature Cycle Guard Operation WEAK SOLUTION Actual Temperature Sample Temperature Specific Gravity Concentration Saturation Temperature Alcohol in Sample Temperature Leaving Low Temperature Heat Exchanger Temperature Leaving High Temp...

Page 31: ...t and solution samples see Solution or Re frigerant Sampling page 34 and determine the specific gravity and temperature of each sample The samples can be returned to the machine through the purge exhaust bottle 4 Using the equilibrium diagram Fig 22A or 22B plot the intersection point of the specific gravity and tem perature of the solution sample Extend this point horizontally to the right and re...

Page 32: ...Fig 26A Equilibrium Diagram for Lithium Bromide in Refrigerant F Fig 26B Equilibrium Diagram for Lithium Bromide in Refrigerant C 32 ...

Page 33: ...ceed 12 psig 80 kPa 4 Leak test all joints with an electronic leak detector 5 Correct all leaks retest to ensure repair 6 Release machine pressure and perform machine evacuation Machine Evacuation Evacuation is required for the removal of excessive noncondensables from the machine The machine must be evacuated after air has entered the machine during service work or when absorber loss is greater t...

Page 34: ... iso lation valve 4 Open the service valve slightly to drain refrigerant sample into the container 5 Turn off service valve remove hose and adapter and dis connect vacuum pump Solution Analysis Laboratory analysis of a solution sample gives indication of change in solution alkalinity and depletion of inhibitor and may indicate the degree of ma chine leak tightness Have the solution analyzed at lea...

Page 35: ...achine control panel see Check Capacity Control Operation section page 23 If machine still fails to maintain design temperature re fer to the Troubleshooting section entitled Problem Symptom Leaving Chilled Water Temperature Too High or Too Low page 41 Low Temperature Cutout Adjustment This ma chine safety serves to prevent freeze up damage to the evapo rator tubes Check the cutout periodically to...

Page 36: ...ini mize the amount of air entering by continuously feeding ni trogen into the machine at approximately 1 psig 7 kPa pressure Perform service work promptly and efficiently and close the machine as soon as possible Do not rely on the inhibitor for corrosion protection unless all lithium bromide and re frigerant have been removed and the machine has been com pletely flooded with a lithium chromate i...

Page 37: ... Rotor Liner Rotor Can 16 Rotor 17 Shaft 18 Plug 19 Bolt 20 Bolt Jack Screw 21 Nut 22 Casing Flange Gasket 23 Pump Casing 24 Bolt 25 Impeller 26 Set Screw 27 Motor Side Wear Ring 28 Set Screw 29 Pump Casing Wear Ring 30 Lock Washer 31 Lock Screw 32 Key 33 Wear Ring Housing 34 Radial Bearing A 35 Thrust Bearing A 36 Thrust Collar A 37 Pin 38 Nut 39 O Ring Gasket 40 Bolt Fig 31 16JT Refrigerant and ...

Page 38: ...out of the rotor cavity being care ful to not damage the bearings or the stator and rotor cans 13 Remove the bolts Items 3 and 40 from the circulating pipe connecting flange s if not previously done to dis connect the pipe from the end of the motor 14 Remove and discard O rings Items 2 and 39 15 Remove the bolts Item 4 on the motor end cover Item 5 and use one as a jacking screw to loosen the end ...

Page 39: ...w passage A should be at the top as the pump is installed on the chiller 3 Place thrust bearings Items 8 and 35 against their re spective thrust collars on the rotor shaft Item 17 Care fully guide rotor Item 16 into position within the stator Item 13 to avoid damage to the bearings rotor liner Item 15 and stator can item 14 4 Install radial bearing Item 34 and motor side wear ring Item 27 in the w...

Page 40: ...lution lines have de crystallized If the heat exchanger or adjacent piping does not decrystallize automatically heat the blocked area ex ternally with steam or a soft torch flame Crystallization in purge piping can be broken up by applying heat in the same manner 4 If the strong solution line from heat exchanger to ab sorber spray nozzles is blocked turn off the condensing water pump and operate t...

Page 41: ...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 and condensate receivers Fouled tubes poor heat transfer Clean tubes Determine if water treatment is necessary Machine needs octyl alcohol Check solution sample a...

Page 42: ...respectively Noncondensables in machine high absorber loss Check absorber loss see Absorber Loss Determination section on page 31 If above 5 F 2 8 C see Causes and Remedies under Inadequate Purging above High steam pressure or hot water temperature above design See Machine Selection Data provided with the machine Set at design Absorber tubes fouled poor heat transfer Clean tubes Determine if water...

Page 43: ......

Page 44: ...ufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 2 Tab 5b PC 211 Catalog No 531 607 Printed in U S A Form 16JT 2SS Pg 44 4 93 Replaces 16JT 1SS ...

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