Follett FZR20-LB Installation, Operation And Service Manual Download Page 36

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36 Troubleshooting

00981795R03 – FZR20/25 LB, PL

Troubleshooting

Before calling for service

1. Check that unit is plugged in.
2. Test outlet with another appliance to verify power.

Problem

Indicators

Corrective Action

Freezer does
not operate (no
components run).

1. Power switch faulty or in OFF position;

loose connection.

1. Turn power switch to ON position; check

switch and connections.

2. Freezer not plugged in.

2. Connect plug.

3. No power at outlet or low voltage.

3. Restore power or correct voltage.

4. Temp controller not energizing

components.

4. Check controller contact terminals for

power. Replace controller if needed.

5. Probe not sensing cut-in temperature.

5. Replace controller and/or probe.

Compressor does not
run.

1. Thermal overload open or defective.

1. Allow to cool or replace.

2. Capacitor and/or relay defective.

2. Replace as required.

3. Compressor defective.

3. Replace compressor.

4. HP switch open or faulty.

4. Allow to cool or replace HP switch.

Evaporator fan motor
does not run.

1. Defective fan motor.

1. Replace fan motor

Freezer does not
shutoff.

1. Controller not sensing cut out

temperature.

1. Replace controller and/or probe.

2. Controller keeping refrigeration system

energized.

2. Replace controller.

Freezer does not
maintain temperature
(all components run).

1. Condenser coil needs cleaning.

1. Clean coil as needed.

2. Door not closing.

2. Adjust door closure per page 5.

3. Excessively high ambient.

3. Maximum recommended ambient is 86 F

(30 F).

4. Refrigerant leak.

4. Locate and repair leak.

5. Incorrect refrigerant charge.

5. Recover, evacuate and weigh in correct

charge.

6. Restricted or faulty TXV..

6. Replace TXV.

7. Inefficient compressor.

7. Consult technical service.

8. Faulty door gasket.

8. Replace door gasket

9. The top air return has ice accumulating

in it.

9. Shine a flashlight into return at top. If ice is

accumulating, defrost completely.

If problems persist after following this basic troubleshooting guide, call Follett’s technical service group at
(877) 612-5086 or +1 (610) 252-7301.

Summary of Contents for FZR20-LB

Page 1: ...764 Following installation please forward this manual to the appropriate operations person 20 C FZR20 25 LB 30 C FZR20 25 PL Order parts online www follettice com 00981795R03 801 Church Lane Easton PA 18040 USA Toll free 877 612 5086 1 610 252 7301 www follettice com ...

Page 2: ... make a new password PIN 15 Min max temperature logging 16 Probe calibration 16 Method 1 16 Method 2 18 Chart recorder set up if so equipped 20 Chart recorder calibration 20 Changing the chart paper 20 Replacing the pen 20 Removing drawers 21 Removing slides 21 Cleaning 21 Interior cleaning 21 Exterior cleaning 21 Annual cleaning and inspection 22 Service 23 Refrigeration system 23 Defrosting 23 C...

Page 3: ...wing is an explanation of the different item numbers Model Cubic foot capacity 20 25 Configuration LB Laboratory shelves PL Plasma drawers Door hinge R Right hand L Left hand Door heater HT fascia heater on all models Chart recorder option 00 No chart recorder CR Chart recorder FZR 20 LB R HT 00 Specifications FZR20 LB FZR25 LB FZR20 PL FZR25 PL Capacity 19 7 cu ft 558 L 24 6 cu ft 697 L 19 7 cu f...

Page 4: ... ambient relative humidity does not exceed 60 RH Clearances To ensure proper ventilation of the refrigeration system the following clearances are required 16 inches 41cm above the freezer 2 inches 5cm behind freezer 9 inches 23cm on the left side If the ambient is 86 F 30 C no side clearance is required Electrical specifications 120 V 60 Hz 1 phase Full load amps 12FLA 67 LRA compressor Minimum ci...

Page 5: ...el protective film from exterior walls of stainless cabinet Adjust self closing door Fig 2 1 Roll freezer to desired location and lock as many casters as possible Fig 2 1 2 If the door appears to be sagging remove the philips screw Fig 2 2 holding the Hold Open Bracket to the Hinge Bracket to gain access to the Sag Adjustment Screw Fig 2 3 Turn the Sag Adjustment Screw to align the door squarely w...

Page 6: ...th a bottom probe perform same procedure for bottom bottle ATTENTION INSTALLER It is imperative that the top probe bottle be filled with a solution that your facility uses to ensure proper operation of unit Fig 5 3 Press lower left corner of front facade door to access power switch inside Fig 5 1 Fig 6 4 Press power switch to turn unit on Fig 6 1 5 Install 2 9 V back up interface batteries Fig 6 2...

Page 7: ...cated RS 485 port Connection provides real time data streaming Temperature Alarms Refrigeration operation MODBUS protocol Uses 6 pin 4 conductor RJ11 jack not supplied Third party probe wire routing if desired Fig 8 top view 1 Use a drill or awl to prepare an opening to allow routing of the third party probe into the cabinet at the location shown Fig 8 2 Use permagum sealant to cover hole opening ...

Page 8: ...st Set time date Change temperature display from factory default Celsius to Fahrenheit if desired Set high low temperature alarms Select password access if required Set up chart recorder if equipped Verify solution is in bottle DANGER Do not extend all of the drawers when fully loaded to avoid the possibility of the freezer tipping forward Refrigeration module area contains mechanical moving parts...

Page 9: ...time and date for stamping of minimum and maximum temperatures 1 Press Menu button Fig 10 Fig 11 2 Use to scroll and highlight Set time date and press Enter to select Fig 11 Fig 12 3 Adjust the year using and press NEXT 4 Adjust the month using and press NEXT 5 Adjust the day using and press NEXT 6 Adjust the hour using and press NEXT 24 HR Clock 7 Adjust the minute using 8 Press Enter to select v...

Page 10: ...displayed in degrees F High and low alarm setup Fig 15 The high alarm is set to a default of 40 C 104 F from the factory This default setting is used so that the alarm will not sound while the unit is pulling down to temperature The low alarm default setting is 40 0 C 40 0 F After the unit has been installed and the system has stabilized approximately 90 min the high and low alarm set points shoul...

Page 11: ...ig 19 5 Use to scroll and highlight Low Alarm Set and press Enter to select Fig 19 Fig 20 6 Use to change set point and press Enter to accept Fig 20 7 Press Back until the main temperature display screen is displayed High Alarm Set Low Alarm Set 30 0C Back Enter High Alarm Setpoint 30 0C Back Enter 18 0C High Alarm Set Low Alarm Set 30 0C Back Enter Low Alarm Setpoint 30 0C Back Enter 40 0C ...

Page 12: ...ss of AC power Display backlight will turn off to conserve battery life but pressing any button will brighten display for 30 seconds Low Battery Alarms Display activates when 2 9V controller back up batteries decrease to 7 5 V maximum 4 hr back up time remaining This alarm will audibly chirp every 5 minutes Chart recorder LED flashes green All batteries should be changed at same time Replace batte...

Page 13: ...Enter to select Fig 23 Fig 24 3 Use to select the volume high medium low and press Enter to select Fig 24 4 Press Back until the main temperature display screen is displayed Alarm silence Fig 25 Audible alarming can be turned off through the menu interface 1 Press Menu button Fig 25 Menu 30 0C Bottom Temp 30 0C Set Alarm Volume Alarm Silence 30 0C Back Enter Buzzer Volume 30 0C Back Enter HIGH Men...

Page 14: ...eatures and settings can be controlled by a password PIN The freezer ships with the password option turned off The default password PIN if the password is turned on is 3843 This password pin number will always work To turn password on off 1 Press Menu button Fig 28 Fig 29 2 Use to scroll and highlight Password on off option and press Enter to select Fig 29 Set Alarm Volume Alarm Silence 30 0C Back...

Page 15: ...ight PIN and press Enter to select Fig 32 Fig 33 3 Use to select the first number of the 4 digit pin Use the Next button to move to the next digit adjust with and repeat for the last 2 digits Press Enter to select Fig 33 4 Press Back until the main temperature display screen is displayed Password 30 0C Back Enter OFF Menu 30 0C Bottom Temp 30 0C Refrigeration Controls Password on off PIN Set Time ...

Page 16: ...een is displayed Probe calibration Fig 37 Follett freezer probes are calibrated to a known standard prior to leaving the factory Recalibration can be easily accomplished at any time if desired Method 1 1 Using a separate temperature sensor and readout with an accuracy better than 0 3 C 0 5 F at 30 C 22 F a NIST traceable calibrated probe and readout is preferred place probe in same solution as RTD...

Page 17: ...dout 9 Press Enter button calibrating the top probe to the separate temperature sensor and readout reading Fig 41 Repeat procedure if calibrating the bottom probe 10 Press Back until main temperature display screen is displayed ATTENTION Bottom temperature probe is only standard on plasma models If unit has the chart recorder option refer to Chart recorder calibration on page 20 Refrigeration Cont...

Page 18: ...compacted ice flake crushed nugget or cracked and a little water 2 Press Menu button Fig 42 Fig 43 3 Use to scroll and highlight Refrigeration Controls press and hold Enter and together for 3 seconds Fig 43 Fig 44 4 Calibration should be highlighted press Enter to select Fig 44 Fig 45 5 Cal Top Probe should be highlighted press Enter to select Fig 45 Menu 30 0C Bottom Temp 30 0C ...

Page 19: ...confirm calibration 11 Remove probe from ice bath and return to solution filled probe bottle 12 Press Back until main temperature display screen is displayed 13 Repeat steps for bottom probe if equipped ATTENTION Bottom temperature probe is only standard on plasma models If unit has the chart recorder option refer to Chart recorder calibration on page 19 Refrigeration Controls Password on off PIN ...

Page 20: ...il pen begins to move 2 Continue to press 1 or 2 button to move pen to record same temperature as probe Changing the chart paper 1 Press and hold 3 button until pen begins to move off chart 2 Once the pen moves completely off chart unscrew knob counter clockwise at center of chart 3 Remove old chart and place new chart in position so that correct time coincides with time line groove on recorder 4 ...

Page 21: ...er switch off located on the upper front facade panel and removing the power cord from the receptacle Interior cleaning Using a sponge or soft cloth clean unit with a non abrasive non chlorinated all purpose detergent Note The left and right air plenums should be removed to clean them as well as behind them Fig 52 53 In addition the shelves drawers and slides should be cleaned as well Allow unit t...

Page 22: ...l in front of condenser may be completely removed for easier cleaning by disconnecting facade and removing upper side panel See Facade removal on page 30 for facade removal instructions 3 Inspect condensate pan for any debris or obstruction in condensate pan Fig 54 1 4 Use a vacuum cleaner with brush attachment to clean condenser compressor and related parts 5 Use a flashlight to look in louvers o...

Page 23: ...ted parts the refrigeration system requires no service or maintenance The system uses a thermostatic expansion valve TXV metering device and is critically charged Access fittings are not provided Temporary piercing valves are required to work on the refrigeration system Follett recommends that if hoses are ever connected to the refrigeration system for service the refrigerant should be recovered p...

Page 24: ...ion Note If defrost terminates on time it will display Defrost Timed Out on the main menu screen This may indicate that the evaporator has not completely defrosted Controller operation ATTENTION BEFORE MAKING ANY CHANGES TO FACTORY DEFAULT REFRIGERATION SETTINGS CONTACT FACTORY The controller displays product temperatures in degrees C or F C is factory default to 1 decimal point The controller is ...

Page 25: ...ttom bottle submerged in solution if equipped otherwise displays default 25 C 77 F NTC1 Evaporator probe NTC2 Defrost probe embedded in evaporator coil 6 Press Back until main temperature display screen is displayed Fascia heater cycle Fig 62 Factory default for the fascia heater cycle is set to 75 based on a 20 minute cycle e g 75 5 minutes off 15 minutes on 1 Press Menu button Fig 62 Calibration...

Page 26: ...ercentage of 20 minute cycle Fig 66 6 Use to adjust heater ON cycle percentage and press Enter to select Do not go lower than default setting of 75 7 Press Back until the main temperature display screen is displayed Refrigeration Controls Password on off PIN Set Time Date 30 0C Back Enter Calibration Refrig Setpoint Differential High Setpoint Limit 30 0C Back Enter Low Set Point Limit Door Heater ...

Page 27: ...t temperature For example if you want the product temperature to be 28 C 18 4 F you would change the Control set point to 29 C 20 2 F The factory default setting for the differential 1 0 C 1 8 F should not be changed Changing the temperature set point Fig 68 1 Press Menu button Fig 67 2 Use to scroll and highlight Refrigeration Controls Fig 68 Fig 69 3 Press and hold Enter and then together for 3 ...

Page 28: ...lect Fig 74 5 Defrost Interval will be highlighted Fig 74 press Enter to view The defrost interval is factory set to every 4 hours consult Technical Service prior to changing 6 Press Back to return to the Defrost Interval screen Refrigeration Controls Password on off PIN Set Time Date 30 0C Back Enter Calibration Refrig Setpoint Differential High Setpoint Limit Low Setpoint Limit 30 0C Back Enter ...

Page 29: ...e delay and refreezing of the coil for an additional 4 minutes before the evap fan restarts This prevents warm air and moisture from blowing onto the cabinet after defrost Consult Technical Service prior to changing 12 Press Back to return to the Evap Fan Delay screen Fig 78 13 Use to scroll and highlight Drip Delay Fig 78 press Enter to view There is a 2 minute drip time delay after defrost termi...

Page 30: ...1 Evaporator cover removal and reinstallation CAUTION To avoid equipment damage do not remove evaporator cover until freezer temperature is 10 C 50 F To avoid damaging the cover you must allow sufficient time for the unit to defrost prior to removing the cover You can put unit through a manual defrost to speed the process see Test defrost manual defrost section 1 Cut silicon sealant on back of eva...

Page 31: ...acade Fig 82 2 8 Reposition board away from mounting location and install new board 9 Using wiring schematic attached to inside of removed back panel as a guide remove wires one at a time from back of existing controller and connect to corresponding terminals on replacement controller 10 If ribbon cable from the display is not connected carefully connect to corresponding location on board Fig 82 3...

Page 32: ...mounting track and press firmly in place 4 Open and close door checking for proper gasket seal without pinching against refrigerator Slide out unit cooler Fig 84 Follett s slide out refrigeration system allows technicians to remove the entire unit from the freezer top 1 If necessary remove facade and upper side panels 2 Remove four bolts securing unit cooler to refrigerator top Fig 84 3 Gently lif...

Page 33: ...C IN FROM PCB PCB BACKUP 9 V RED BLK FASCIA HEATER MAGNET DOOR SW TOP PROBE RTD 1 GND WHT WHT BOTTOM PROBE RTD 2 RED RED WHT GND CONTROL PROBE NTC 1 BLK BLK LCD K1 12 VDC RED BLK 70 73 RED RED WHT K2 K3 K4 K5 10 13 01 02 16 17 04 06 39 18 J23 J20 J26 J27 J28 J24 08 J19 J1 38 37 INTERIOR LINER J30 1 4 2 5 J36 21 22 42 63 64 12 15 11 14 76 K4 53 54 55 DEFROST HEATER PAN HEATER K6 K7 DEFROST PROBE NT...

Page 34: ... 16 10 17 07 09 G BAT3 9V L1 GND N 120Vac 20Amp 1 2 3 5 20P ON OFF SWITCH 11 41 12 14 15 10 13 5 4 3 2 1 FASCIA HEATER 63 64 04 40 06 17 18 5 4 3 2 1 R S C COMP COND FAN EVAP FAN ASSY CRS 00980540 PROBE t CONTROL NC SWITCH DOOR 05 BAT1 9V BAT2 9V 02 42 RTD1 J6 C NO NC 53 54 54 55 2 1 DEFROST PAN HEATER HEATER PROBE t BOTTOM CABINET G RTD2 PROBE t DEFROST 2 1 2 1 52 51 t t 32 08 04 09 DRAIN HEATER ...

Page 35: ... S R 4 2Ω Evaporator Fan Motor Data RLA 0 28A Ohm 38Ω or 95Ω Condenser Fan Motor Data RLA 0 58A Ohm 35Ω Defrost Heater Data Evaporator Heater 400 W 2 98A 4 0A 31Ω 35Ω Drain Pan Heater 85 W 0 63A 0 86A 148Ω 163Ω Drain Tube Heater 15 W 0 11A 0 15A 909Ω 1005Ω Total in parallel 3 88A 5 24A 25Ω 28Ω Fascia Heater Data 70 W 0 47A 0 65A 196Ω 216Ω ...

Page 36: ...switch open or faulty 4 Allow to cool or replace HP switch Evaporator fan motor does not run 1 Defective fan motor 1 Replace fan motor Freezer does not shutoff 1 Controller not sensing cut out temperature 1 Replace controller and or probe 2 Controller keeping refrigeration system energized 2 Replace controller Freezer does not maintain temperature all components run 1 Condenser coil needs cleaning...

Page 37: ...24 C 40 C to 40 C 40 C to 40 C Differential 1 C 1 to 2 C Hi Setpoint Limit 15 C 40 C to Lo Set Pt Lo Setpoint Limit 32 C 40 C to Hi Set Pt Door Heater Cycle 75 0 to 100 0 to 100 of 20 minute cycle Faulty Probe Cycle On Time 6 min 2 to 14 min Compressor On time Off Time 5 min 2 to 14 min Compressor Off time Temp Sensors RTD1 RTD2 NTC1 and NTC2 displayed Defrost Defrost Interval 4 hrs 2 to 6 hrs Tim...

Page 38: ...38 Replacement parts 00981795R03 REF20 25 LB PL Replacement parts Unit cooler 2 13 15 6 16 11 10 19 12 18 7 9 3 14 1 17 5 4 8 ...

Page 39: ...8 5 FZR cooling unit includes gasket and mounting bolts 01007004 6 Evaporator fan motor with blade 01025774 7 FZR condenser fan motor with blade 00996447 8 TXV FZR 20 25 includes clamps and insulation 00996462 9 Compressor includes overload and mounting grommets 00996371 10 Start capacitor 00996397 11 Run capacitor 00996405 12 Potential relay 01002724 Not shown Compressor overload 00996389 13 Evap...

Page 40: ...ith supports 01015858 6 Pilaster with screws 01015866 7 Shelf supports qty 1 4 needed per shelf 00156240 8 Drawer assembly FZR25 01015791 8 Drawer assembly FZR20 01015809 9 Kit fascia heater with thermal break covers 01015882 Not shown Air panel FZR20 25 PL 00978569 Not shown Air panel FZR20 25 LB 00901561 Not shown Probe channel 01004159 Not shown Probe RTD top 00918839 Not shown Probe RTD NIST c...

Page 41: ...out chart recorder 00996561 6 Facade front cover only for units with charter recorder 00940130 Not shown Facade front cover only for units with charter recorder 00940155 7 Pens chart recorder red box of 6 00918813 Not shown Charts FZR box of 50 in degrees C 00980870 Not shown Charts FZR box of 50 in degrees F 00980888 8 Battery 9V 00112177 9 Fastener latch 00179556 10 Upper side panel FZR25 009400...

Page 42: ... hand hinges and hardware 00996587 2 Right hand hinges and hardware 00996579 Not shown Door magnet kit 00939967 Not shown Bracket door lock strike 00939983 Not shown FZR door key 01035013 3 Lock door 00996629 Not shown Wall bracket kit seismic anchoring 00927194 4 Door handle kit 00996637 5 Molded door handle cap top 00989251 6 Molded door handle cap bottom 00989244 Follett is a registered tradema...

Page 43: ...00981795R03 REF20 25 LB PL Replacement parts 43 ...

Page 44: ...0981795R03 Follett Corporation 2 16 801 Church Lane Easton PA 18040 USA Toll free 877 612 5086 1 610 252 7301 www follettice com Follett is a registered trademark of Follett Corporation registered in US ...

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