Frymaster YFG255 Service & Parts Manual
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Frymaster YFG255 Service & Parts Manual

Frymaster YFG255 Service & Parts Manual

Rethermalizer
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Frymaster, a member of the Commercial Food Equipment Service Association, recommends
using CFESA Certified Technicians.
24-Hour Service Hotline
08/2022
*8196900*
1-800-551-8633
www.frymaster.com
Email:
service@frymaster.com

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Summary of Contents for Frymaster YFG255

  • Page 1 Frymaster, a member of the Commercial Food Equipment Service Association, recommends using CFESA Certified Technicians. 24-Hour Service Hotline 08/2022 *8196900* 1-800-551-8633 www.frymaster.com Email: service@frymaster.com...
  • Page 2 Further, Frymaster and its affiliates will not be liable for any claims, damages or expenses incurred by the customer which arise directly or indirectly, in whole or in part, due to the installation of any modified part and/or part received from an unauthorized servicer.
  • Page 3 CONTROLLERS This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: 1) This device may not cause harmful interference, and 2) This device must accept any interference received, including interference that may cause undesired operation. While this device is a verified Class A device, it has been shown to meet the Class B limits.

  • Page 4: Table Of Contents

    Troubleshooting and Problem Isolation 1-13 Troubleshooting Guides 1-18 Probe Resistance Chart 1-20 Wiring Diagram 1-21 PARTS LIST YFG255 Cabinet and Related Components Cookpot Assemblies and Components Transformer Boxes and Control Frame Assemblies Harnesses Plumbing, Incoming Water Plumbing, Drain Plumbing, Gas Manifold Fasteners...

  • Page 5: Service Procedures

    CHAPTER 1: SERVICE PROCEDURES 1.1 Functional Description YFG255 Series gas rethermalizers contain a welded stainless steel cookpot that is heated by gas flames diffused evenly through tubes built into the cookpot. Flames originate from orifices in a burner manifold positioned beneath the burners. The burners are positioned in the tube openings, at the front of the cookpot.
  • Page 6 Control Options YFG255 Series gas rethermalizers are equipped with a factory preset temperature controller. These are unique in that the components are wired directly to the controller and do not require an interface board.

  • Page 7: Cleaning The Gas Valve Vent Tube (If Applicable)

    YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.2 Accessing Rethermalizers for Servicing DANGER Moving a rethermalizer filled with water may cause spilling or splattering of the hot liquid. Follow the draining instructions included with the rethermalizer before attempting to relocate a rethermalizer for servicing.

  • Page 8: Replacing Rethermalizer Components

    YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES Adjusting Burner Manifold Gas Pressure (cont.) 3. Insert the fitting for a gas pressure-measuring device into the pressure tap hole. 4. Place the gas valve in the "ON" position then place the rethermalizer power switch in the "ON"...
  • Page 9 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.5.1 Replacing the Controller or Solid State Relays cont. 4. Remove the controller from the bezel. 5. Reverse the procedure to install a new controller. 1.5.2 Replacing the Temperature Probe 1. Disconnect the rethermalizer from the electrical supply.
  • Page 10 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.5.2 Replacing the Temperature Probe (cont.) 7. Loosen and unscrew completely the compression nut, then the pass-through nut from the cookpot. Proceed to the next step before removing probe from cookpot. Note: The temperature probe can be removed through the top of the cookpot as follows: Ensure the probe wires have been removed from the connector (step 6).
  • Page 11 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.5.3 Replacing Float Switches 1. Disconnect the rethermalizer from the electrical power supply. 2. Drain the water from the cookpot. Allow the cookpot to cool completely before proceeding. 3. Unplug the low float switch connector from behind the controller (See section 1.5.1 for instructions on removing the...
  • Page 12 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 4. Remove the pipe union collars to the left and right of the gas valve and remove the valve. 5. Remove the pipefitting from the old gas valve and install on the replacement valve, using Loctite™...
  • Page 13 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.5.6 Replacing the Cookpot (cont.) 5. Remove upper cookpot cover and bracket. 6. Carefully pry up and remove capping strip. Removing capping strip. 7. Locate all screws securing back panels. Screw location/orientation will vary according to rethermalizer model.
  • Page 14 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.5.6 Replacing the Cookpot (cont.) 12. Remove four bolts securing flue to the cookpot being removed. Remove the flue by sliding back and away until clear of cookpot. Retrieve any screws dropped into the flue during removal of the flue cap to cookpot bracket.
  • Page 15 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.5.6 Replacing the Cookpot (cont.) 15. Remove screw(s) securing the electronic or standing pilot bracket to the cookpot bracket. Reposition ignitor assembly down and away from cookpot. Use care not to bend, kink or damage the electronic ignition lines and wiring.
  • Page 16 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.5.7 Annotated Cookpot Bottom 1-12...

  • Page 17: Troubleshooting And Problem Isolation

    YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.6 Troubleshooting and Problem Isolation This section is intended to provide technicians with a general knowledge of the broad problem categories associated with this equipment, and the probable causes of each. With this knowledge, the technician should be able to isolate and correct any problem encountered.
  • Page 18 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.6.1 Ignition Failures (cont.) Problems Related to the Electronic Circuits If gas and electrical power are supplied to the rethermalizer, the next most likely cause of ignition failure is a problem in the 24 VAC circuit. First verify that the float switch valve is fully closed and not sticking.
  • Page 19 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.6.2 Improper Burner Functioning (cont.) If popping occurs only during peak operating hours, the problem may be incorrect or fluctuating gas pressure. Verify that the incoming gas pressure (pressure to the gas valve) is in accordance with the appropriate CE or Non-CE requirements listed in the Installation and Operation manual that came with the rethermalizer, and that the pressure remains constant throughout all hours of usage.
  • Page 20 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES Fluctuating flame intensity is normally caused by either improper or fluctuating incoming gas pressure, but may also be the result of variations in the kitchen atmosphere. Verify incoming gas pressure in the same way as for "popping", discussed in the preceding paragraphs. Variations in the kitchen atmosphere are usually caused by air conditioning and/or ventilation systems starting and stopping during the day.
  • Page 21 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.6.4 Leakage Cookpot leaks are almost always due to an improperly sealed temperature probe, float switches and drain fittings. When installed or replaced, each of these components must be sealed with Loctite PST567 sealant or equivalent to prevent leakage.

  • Page 22: Troubleshooting Guides

    YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES Troubleshooting Guides The following troubleshooting guides are intended to assist service technicians in quickly isolating the probable causes of equipment malfunctions by following a logical, step-by-step process. 1.7.1 General Troubleshooting PROBLEM PROBABLE CAUSES CORRECTIVE ACTION A.
  • Page 23 YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.7.1 General Troubleshooting (cont.) PROBLEM PROBABLE CAUSES CORRECTIVE ACTION A. Press the ON/OFF switch off. Clean float switch and make sure that the float switch is not bent and that the A. Float switch stuck or defective.

  • Page 24: Probe Resistance Chart

    YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.7.1 General Troubleshooting (cont.) PROBLEM PROBABLE CAUSES CORRECTIVE ACTION A. Flame sensor possibly out of A. Pilot does not stay lit. alignment. Realign flame sensor. Check flame sensor for loose wires. B. Pilot stays lit, and the flame sensor is B.

  • Page 25: Wiring Diagram

    YFG255 SERIES GAS RETHERMALIZERS CHAPTER 1: SERVICE PROCEDURES 1.9 Wiring Diagram Note: The diagram in this section depict wiring as of the date of manual publication. It may not reflect design changes made to the equipment after publication. Refer to the wiring diagram affixed to the unit when actually troubleshooting this equipment.

  • Page 26: Parts List

    YFG255 SERIES GAS RETHERMALIZERS CHAPTER 2: PARTS LIST 2.1 YFG255 Cabinet and Related Components See Page 2-3 for Cookpot Assemblies and components. ITEM PART # COMPONENT 231-8755 Side Panel, Left Side 232-8755 Side Panel, Right Side 108-1803 Door Assembly 106-4067...
  • Page 27 YFG255 SERIES RETHERMALIZERS CHAPTER 2: PARTS LIST 2.1 YFG255 Cabinet and Related Components (cont.) ITEM PART # COMPONENT 231-8098 Strip, Cookpot Rim Left 230-7244 Strip, Joiner 232-8098 Strip, Cookpot Rim Right 823-7899 Fluecap 823-7944 Topcap 230-8183 Fascia, Control Panel 807-0012...

  • Page 28: Cookpot Assemblies And Components

    YFG255 SERIES RETHERMALIZERS CHAPTER 2: PARTS LIST Cookpot Assemblies and Components ITEM PART # COMPONENT 823-7641SP Cookpot 108-0129 Flue Box Assembly 826-2622 Upper Float Switch (requires 813-0619) 813-0619 Flareless Male Tube Connection SS 108-0934 Lower Float Switch 826-2705 Snap Rings, Float Pkg. 5...

  • Page 29: Transformer Boxes And Control Frame Assemblies

    YFG255 SERIES RETHERMALIZERS CHAPTER 2: PARTS LIST 2.3 Transformer Boxes and Control Frame Assemblies ITEM PART # COMPONENT 807-2176 Transformer, 100/120V 12/24VAC Dual Voltage 807-1973 Terminal, Post 807-0070 Terminal, Ground Lug 823-7781 Box, Transformer 220-7698 Cover, Transformer Box 108-0959 Assembly, Harness...

  • Page 30: Harnesses

    YFG255 SERIES RETHERMALIZERS CHAPTER 2: PARTS LIST 2.4 Harnesses ITEM PART # COMPONENT 108-2800 Harness, Transformer, Solenoid and Float 108-2801 Harness, Controller, Switch and Light 108-2802 Harness, Ignition Module and Gas Valve...

  • Page 31: Plumbing, Incoming Water

    YFG255 SERIES RETHERMALIZERS CHAPTER 2: PARTS LIST 2.5 Plumbing, Incoming Water ITEM PART # COMPONENT 108-0933 Solenoid Valve Assembly Fitting, ¼” NPT x ⅜” Tube Hose Barb 810-3199 Clamp, ⅝” Hose 810-3244 Tubing, Clear Plastic ⅜” ID (sold by the foot)

  • Page 32: Plumbing, Drain

    YFG255 SERIES RETHERMALIZERS CHAPTER 2: PARTS LIST 2.6 Plumbing, Drain ITEM PART # COMPONENT 220-8186 Shield, Vapor Front 809-0374 Clamp, Hose 813-0138 Nipple 813-0202 Elbow, 90° 1” 813-0314 Tee, 1” 813-0525 Barb Fitting, 1” Pipe to Hose 816-0779 Hose, Drain 10.25”...

  • Page 33: Plumbing, Gas Manifold

    YFG255 SERIES RETHERMALIZERS CHAPTER 2: PARTS LIST 2.7 Plumbing, Gas Manifold To burner manifold. ITEM PART # COMPONENT 807-3552 Valve, Gas Natural 24V Honeywell 807-3628 Valve, Gas Propane 24V Honeywell 200-1450 Bracket, Gas Valve Support 810-2808 Clamp, ¾” 810-3722 Clamp, ½” Pipe Heavy 813-0066 Elbow, ¾”...

  • Page 34: Fasteners

    YFG255 SERIES RETHERMALIZERS CHAPTER 2: PARTS LIST 2.8 Fasteners ITEM PART # COMPONENT 809-0428 Bolt, ¼-inch – 20 x ½-inch Hex Head ZP Tap 809-0429 Bolt, ¼-inch – 20 x 2.00-inch Hex Head ZP Tap 809-0514 Capscrew, 5/16-inch-18 NC Hex...
  • Page 35 THIS PAGE INTENTIONALLY LEFT BLANK...
  • Page 36 Welbilt offers fully-integrated kitchen systems and our products are backed by KitchenCare aftermarket parts and service. Welbilt’s portfolio of award-winning ® brands includes Cleveland , Convotherm , Crem , Delfield , Frymaster , Garland ™ ® ® ® ® ®...

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