ML-130 Service Manual Phase 6 Microprocessor Timer Controls American Dryer Corporation 88 Currant Road Fall River, MA 02720-4781 Telephone: (508) 678-9000 / Fax: (508) 678-9447 e-mail: techsupport@amdry.com 121099DMG/tcosta ADC Part No.
Retain This Manual In A Safe Place For Future Reference American Dryer Corporation products embody advanced concepts in engineering, design, and safety. If this product is properly maintained, it will provide many years of safe, efficient, and trouble-free operation. ONLY qualified technicians should service this equipment. OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation/operator's manual included with the dryer.
IMPORTANT YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS SUPPLY or THE STEAM SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS. “Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper operation.
WARNING The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJURY or FIRE COULD RESULT. WARNING DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER/SCREEN IN PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED. IMPORTANT PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and/or specified in the installation and operator's manual included with the dryer.
Table of Content SECTION I IMPORTANT INFORMATION ............................................................................... 3 A. Safety Precautions ...................................................................................................................... 3 SECTION II ROUTINE MAINTENANCE .................................................................................... 5 A. Cleaning ...........................................................................................................
SECTION V SERVICING .............................................................................................................. 15 A. B. C. D. E. F. G. H. I. J. K. L. Computer Controls ................................................................................................................... 15 Ignition Controls ....................................................................................................................... 17 Thermostats ...................................................
SECTION I IMPORTANT INFORMATION A. SAFETY PRECAUTIONS WARNING: For your safety, the information in this manual must be followed to minimize the risk of fire or explosion or to prevent property damage, personal injury, or loss of life. WARNING: The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJURY or FIRE COULD RESULT. 1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. 2.
WARNING: DO NOT dry mop heads. Contamination by wax or flammable solvents will create a fire hazard. WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or similarly textured rubber materials. Drying in a heated tumbler (basket) may damage plastics or rubber and also may be a fire hazard. 7. A program should be established for the inspection and cleaning of lint in the heating unit area, exhaust duct work, and inside the dryer.
SECTION II ROUTINE MAINTENANCE A. CLEANING A program and/or schedule should be established for periodic inspection, cleaning, and removal of lint from various areas of the dryer, as well as throughout the duct work system. The frequency of cleaning can best be determined from experience at each location. Maximum operating efficiency is dependent upon proper air circulation. The accumulation of lint can restrict this airflow.
NOTE: To prevent damage, avoid cleaning, and/or touching ignitor and flame-probe assembly. Remove lint accumulation from inside control box and at rear area behind control box. EVERY 6 MONTHS Inspect and remove lint accumulation in customer furnished exhaust duct work system and from dryer’s internal exhaust ducting. WARNING: THE ACCUMULATION OF LINT IN THE EXHAUST DUCT WORK CAN CREATE A POTENTIAL FIRE HAZARD. WARNING: DO NOT OBSTRUCT THE FLOW OF COMBUSTION and VENTILATION AIR.
SECTION III INSTALLATION REQUIREMENTS Installation should be performed by competent technicians in accordance with local and state codes. In the absence of these codes, the installation must conform to applicable American National Standards: National Fuel Gas Code ANSI.Z223.1-LATEST EDITION or National Electrical Code ANSI/NFPA No. 70-LATEST EDITION, or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (L.P.
IMPORTANT: Failure to comply with these codes or ordinances and/or the requirements stipulated in this manual can result in personal injury or component failure. The gas dryer installation must meet the American National Standard, National Fuel Gas Code ANSI Z223.1LATEST EDITION, or in Canada, the Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION (for Electrical Connections) as well as, local codes and ordinances, and must be done by a qualified technician.
NOTE: Water column pressure requirements (measured at the pressure tap on the gas valve body): Natural Gas - 3.5 inches water column (W.C.) - 8.7 mb. L.P. Gas - 10.5 inches water column (W.C.) - 26.1 mb. 6. If computer program changes are required, refer to the Phase 6 OPL User’s Manual (ADC Part No. 113022) for details. 7. The dryer should be operated through one complete cycle to assure that no further adjustments are necessary and that ALL components are functioning properly. 8.
SECTION IV DESCRIPTION OF PARTS A. CONTROL BOX Lifting the control door and opening the computer panel will reveal the control box. Inside the control box are ALL the electronic control components. Located on the back of the control panel is the computer. Included in the control box are the 30-position block, fuse block, and transformer. B. DRIVE MOTOR The T.E.F.C. (Totally Enclosed, Fan-Cooled) drive motor is located approximately lower center of the dryer.
D. GAS BURNER ASSEMBLY Gas heated dryers are equipped with a gas burner assembly consisting of three (3) burner tubes, gas valve, glo bar, flame sensor, sail switch, and hi-limit thermostat. The inlet piping enters through the rear of the dryer on the left hand side (viewing from the front) and runs to the front of the dryer where the gas valve is located. E. BLOWER MOTOR and IMPELLOR The impellor on the ML-130 is shaft driven. The blower motor drives the shaft on which the impellor is mounted.
G. TUMBLER (BASKET) BEARING and PULLEY ARRANGEMENT The tumbler (basket) bearing and pulley arrangement is located (viewing from the rear of the dryer) approximately at the upper center of the dryer. The arrangement consists of a pulley and two (2) bearings which serve to drive, adjust, and support the tumbler (basket). H. TUMBLER (BASKET) The tumbler (basket) consists of four (4) ribs and four (4) perforated panels, along with a front and back, which are screwed together as an assembly.
J. SAIL SWITCH (Gas and Electric Models Only) The sail switch is located on the front of the burner box for gas dryers on the right side of the oven assembly for electric dryers. A sail switch consists of a round damper plate on a lever arm which is in contact with an electric switch. When the air blower comes on, it draws air through the gas or electric burner. This creates a negative pressure inside the burner box, and this negative pressure pulls in the round damper and activates the sail switch.
M. LINT DRAWER The lint drawer is a pull-out type and is located at the bottom of the dryer in the lint compartment. Simply grab the lint drawer handle, slide out the drawer, brush off the lint, and slide the drawer back in. The lint screen must be kept clean in order for the dryer to operate properly and efficiently. N. LINT DRAWER SWITCH The lint drawer switch is located in the lint compartment and attached to the side of the lint drawer track.
SECTION V SERVICING INTRODUCTION ALL electrical and mechanical service or repairs should be made with the electrical power to the dryer disconnected (power off). WARNING: PERSONAL INJURY COULD RESULT. The information provided in this section should not be misconstrued as a device for use by an untrained person making repairs. Service work should be performed by competent technicians in accordance with local, state, and federal codes.
To Replace Computer 1. Disconnect electrical power to the dryer. 2. Disconnect main power harness from rear of computer by squeezing locking tab and pulling connector straight back. 3. Disconnect the “green” ground wire from the computer. 4. Disconnect keyboard (touchpad) ribbon from computer. 5. Remove the two (2) hex nuts securing the computer to the sheet metal control panel. Remove the board by pulling the other two (2) corners off the clinch studs. 6. Install new computer by reversing this procedure.
b. Loosen the two (2) Phillips head screws securing bracket assembly to dryer and remove bracket from dryer. NOTE: DO NOT remove screws. 4. Disassemble sensor probe from bracket assembly by removing the top push-on fastener securing the probe to the bracket. Use a small screwdriver to slowly pry the fastener off. 5. Disconnect the two (2) “orange” wires from the high heat (225º F [107º C]) thermostat, and remove modular bracket connector, wires, and probe from bracket assembly. 6.
NOTE: Before reestablishing electrical power to the dryer visually check the following (refer to illustration above). 5. Reestablish procedure for installation of new ignitor. To Remove Flame Sensor Probe 1. Discontinue electrical power to the dryer. 2. Disconnect the “red” wire from the flame sensor probe which goes to S2 on the HSI (Hot Surface Ignition) module. 3. Disassemble flame sensor probe from burner by removing the one (1) self tapping screw. 4.
NOTE: Identify location of each wire for correct reinstallation. 4. Break union connection before gas valve. 5. Loosen and remove four (4) screws securing pipe brackets to burner. 6. Remove gas valve and manifold assembly from dryer. 7. Remove valve mounting bracket, manifold, and piping from gas valve. 8. Reverse procedure for installing new gas valve. WARNING: Test ALL connections for leaks by brushing on a soapy water solution.
2. To Adjust Water Column Pressure (natural gas only, L.P. gas must be regulated at source): a. Remove the slotted vent cap on the top of the valve. b. Turn the slotted adjustment screw located on top of the valve next to the terminals. Turn clockwise (CW) to increase manifold pressure and counterclockwise (CCW) to decrease. NOTE: If correct W.C. pressure cannot be achieved, problem may be due to an undersized gas supply line, a faulty or underrated gas meter, etc. To Convert from Natural Gas to L.P.
To Replace Burner Tubes 1. Refer to “To Replace Gas Valve” and follow Step #1 through Step #6. 2. Remove four (4) screws securing manifold rest and remove rest. 3. Remove the screws securing the front flanges of the burner tubes to the burner tube rest. 4. Remove the screws securing the burner tube rest to the oven and remove this rest. 5. Remove screws securing the sight hole disk and burner box cover plate to the oven and remove both of these pieces. 6. Remove burner tubes by sliding them out. 7.
NOTE: Models manufactured as of 1998 are equipped with a manual reset hi-limit thermostat. 1. Discontinue electrical power to the dryer. 2. Disconnect wires from hi-limit thermostat. 3. Remove the two (2) screws, washers, and nuts securing thermostat to the bracket. Remove thermostat. 4. Reversing procedure for installing new thermostat. 5. Reestablish electrical power to the dryer.
D. SAIL SWITCH ASSEMBLY (Gas and Electric Models Only) The sail switch is a heat circuit safety device which controls the burner circuit only. When the dryer is operating and there is proper airflow, the sail switch damper pulls in and closes the sail switch. Providing ALL the other heat-related circuits are functioning properly, ignition should now be established. If an improper airflow occurs, the sail switch damper will release, and the circuit will open. To Replace Sail Switch 1.
6. Reverse this procedure for installing new door switch assembly. 7. Reestablish electrical power to the dryer. IMPORTANT: UNDER NO CIRCUMSTANCES should the door switch be disabled. To Replace Main Door Assembly 1. Open main door. 2. Holding the door upward remove the two (2) screws from the top hinge block. 3. Lift the door up to remove. 4. Reverse this procedure for reinstalling new main door assembly. To Install New Main Door Glass 1.
4. Remove glass and clean ALL old sealant off main door. This area must be clean for correct bonding. 5. Place a bead of silicone (ADC P/N 170730) around the edge door and lightly press glass into place. 6. Reinstall the four (4) #10-32 acorn nuts that were removed in Step #3. IMPORTANT: DO NOT press hard or the silicone thickness between the glass and door will be reduced, resulting in poor bonding. 7. The door assembly should now be put in an area where it will not be disturbed for at least 24 hours.
F. PULLEYS To Replace Tumbler (Basket) Pulley 1. Loosen V-belts. Rotate pulley and roll V-belts out of grooves. 2. Remove cap screws from the bushing. 3. Insert cap screws in tapped removal holes and tighten evenly until bushing becomes loose on shaft. Refer to figure “A.” 4. Remove bushing, pulley, and key. 5. Assemble bushing and sheave as shown in figure “B.” When cap screws are loosely inserted, bushing remains fully expanded to provide a sliding fit on the shaft. 6.
7. Tighten cap screws progressively. There should remain a gap between the sheave hub and the flange of the bushing. IMPORTANT: Tighten screws evenly and progressively. Never allow the sheave to be drawn in contact with the flange of the bushing. This gap should measure from 1/8” to 1/4”. Proper cap screw torque is 6 ft-lbs. (8 Nm), if greater tightening forces are applied, excess pressures will be created in the hub of the mounted sheave which may cause it to crack. To Replace Large Idler Pulley 1.
5. Assemble bushing and sheave as shown in figure “B” on page 26. When cap screws are loosely inserted, bushing remains fully expanded to provide a sliding fit on the shaft. 6. Insert key on the shaft, then slide sheave to desired position with cap screw heads to the outside. 7. Tighten cap screws progressively. There should remain a gap between the sheave hub and the flange of the bushing. IMPORTANT: Tighten screws evenly and progressively.
Tumbler (Basket) Alignment (Lateral) (Side to Side Adjustment) 1. Discontinue electrical power to the dryer. 2. Remove back guard. 3. Loosen rear pillow block bearing bolts (C). 4. Back off jam nuts on the two (2) lateral adjustment bolts (A) and (B). 5. Simultaneously loosen one bolt and tighten the other. This will move the rear pillow block bearing. Center the tumbler (basket) in the wrapper cavity. 6. Tighten and secure both lateral adjustment bolts (A) and (B) and jam nuts. 7.
8. Remove tumbler (basket) from tumbler (basket) support. a. Remove the bolt in the center of the tumbler (basket) back wall. b. Loosen and remove the eight (8) sets of nuts and washers from tumbler (basket) tie rods. Remove the eight (8) tie rods. c. Replace either tumbler (basket) or tumbler (basket) support by reversing procedure. NOTE: Shims might be needed between tumbler (basket) and tumbler (basket) support to insure proper balancing of tumbler (basket). 9.
4. Remove the two (2) retaining rings from the tumbler (basket) shaft. 5. Remove the two (2) bolts holding the front tumbler (basket) support pillow block bearing to the dryer. 6. Loosen bearing collar set screws (2) and as the end of the tumbler (basket) shaft is lifted up slightly, slide the bearing off the shaft. 7. Prop a block of wood between the tumbler (basket) shaft and the bearing mount to keep the tumbler (basket) level and in place. 8. Replace by reversing Step #2 through Step #6.
I. V-BELTS V-belts should have proper tension. If too loose, they will slip, if too tight, excessive wear on the bearings will result. If the pulleys are not properly aligned, excessive belt wear will result. Proper belt tension will allow 1/2” displacement under normal thumb pressure at mid span of belt. NOTE: Belts must always be replaced in pairs (matched sets). V-Belt Tension Adjustment (Tumbler [Basket] to Idler) 1. Discontinue electrical power to the dryer. 2.
NOTE: Always replace belts in matched sets (2 belts). J. MOTORS To Replace Drive Motor 1. Discontinue electrical power to the dryer. 2. Remove drive belts. 3. Disconnect wiring harness from motor. 4. Remove bolts holding motor to mount and replace with new motor. DO NOT tighten bolts. 5. Remove pulley from old motor and install on new motor. 6. Align motor pulley with idler pulley and align motor shaft with idler shaft and tighten bolts. 7. Replace belts and adjust belt tension. 8. Retighten bolts. 9.
K. IMPELLOR 1. Discontinue electrical power to the dryer. 2. Remove the left side panel to access the fan shaft mount assembly. 3. Remove the two (2) left handed jam nuts that hold the impellor to the fan shaft. 4. Remove the impellor, washers, and the key. 5. Replace the impellor, key, washers, left handed jam nuts, and the side panel. 6. Reestablish electrical power to the dryer. L. LINT DRAWER ASSEMBLY To Replace Lint Screen 1. Pull out lint drawer. 2. Remove lint screen from lint drawer. 3.
SECTION VI TROUBLESHOOTING IMPORTANT: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS SUPPLY or THE STEAM SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS. The information provided will help isolate the most probable component(s) associated with the difficulty described.
C. Dryer will not start, but computer display indicators are on... 1. Failed contactors. 2. Failed arc suppressor (A.S.) board. 3. Failed microprocessor controller (computer). 4. Failed motors. D. Drive motor runs, burner is on, but tumbler (basket) will not turn... 1. Broken, damaged, or loose V-belt. 2. Belts contaminated (oil, grease, etc.). 3. Loose or broken pulley. E. Dryer operates but is taking too long to dry... 1. Improperly programmed microprocessor controller (computer). 2.
F. Thermal overload for drive motor is tripping... 1. Either an exceptionally low or high voltage supply. 2. Motor bearing failure. 3. Motor vents are blocked with lint. 4. Failed motor. 5. Failed overload. 6. Out of balance impellor (fan). 7. Insufficient make-up air. G. Overload for impellor (fan) motor is tripping... 1. Either an exceptionally low or high voltage supply. 2. Motor bearing failure. 3. Motor vents are blocked with lint. 4. Failed motor. 5. Failed overload. 6. Insufficient make-up air. H.
I. Display reads “Temp Sensor Failure Check Temp Sensor Fuse.” Dryer Sensor Circuit Failure... 1. Check 1/8-amp fuse on microprocessor controller (computer). 2. Faulty microprocessor controller (computer) temperature sensor probe. 3. Open circuit in either one (1) of two (2) wires leading from the sensor probe to the computer... a. Connection at sensor bracket assembly connector. b. Connection at computer harness connector. 4. Faulty microprocessor controller (computer). J. Dryer does not start.
SECTION VII PHASE 6 OPL SYSTEM DIAGNOSTICS IMPORTANT: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS SUPPLY or THE STEAM SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS. ALL major circuits, including door, microprocessor temperature sensor, heat and motor circuits are monitored.
6. bURNER CONTROL FAIL- This routine monitors the ignition control’s gas valve output response. If the valve output signal is not present from the ignition control within the valve time limits the Phase 6 microprocessor controller (computer) determines the ignition control has failed. If this occurs when the cycle is active the machine will display “bURNER CONTROL FAIL.” If the tumbler (basket) temperature is above 100º F (38º C) the machine will continue to display “bURNER CONTROL FAIL.
11. ROTATE SENSOR FAIL- Indicates a rotational sensor circuit failure meaning that there is a fault somewhere in the tumbler (basket) rotating circuit, or the Phase 6 OPL microprocessor controller (computer) program related to this circuit (program location 2) is set incorrectly. In the active mode it should be (ROTATE SENSOR ACTIVE), if the dryer is not equipped with the optional rotational sensor it should be set in the nonactive mode (No ROTATE SENSOR).
4. L.E.D. DISPLAY INDICATOR NUMBER 4 a. On Indicator: 1) This indicator dot is on whenever a cycle is in progress. Additionally, when the Anti-Wrinkle program is active, the indicator dot will be on whenever the Phase 6 OPL microprocessor controller (computer) is in the Guard On Time program. 5. L.E.D. DISPLAY INDICATOR NUMBER 5 a. Air Jet Circuit - OPTIONAL 1) This indicator dot is on at the end of the dryer cycle for approximately 60 seconds. C.
1. “FAN” (BLOWER) Output L.E.D. Indicator a. If the dryer is started and the blower motor is not operating, yet the Phase 6 OPL microprocessor controller (computer) display fan indicator dot and power supply input L.E.D. are on, but the fan output L.E.D. is off, then the fault is the Phase 6 OPL microprocessor controller (computer) itself. 1) If the motor is not operating. The fan indicator dot and output L.E.D. are also on, then the problem (fault) is elsewhere (i.e.
6. “FUSE” (MAIN FUSE) Input L.E.D. Indicator a. Should be on ALL the time (even if the dryer is not running). If the L.E.D. is not on; then the display will read “CHECK MAIN FUSE.” If the main fuse is good then the fault is on the Phase 6 microprocessor controller (computer). 7. “LINT” (LINT DOOR) Input L.E.D. Indicator a. Should be on ALL the time (unless the lint door is opened then the “LINT” L.E.D. indicator will go out). b. If the dryer is active (running) and the lint door is opened the “LINT” L.E.D.
12.“FLAME” (bURNER CONTROL FAIL) Input L.E.D. Indicator a. This routine monitors the ignition control’s gas valve output response. If the valve output signal is not present from the ignition control within the valve time limits the microprocessor determines the ignition control has failed. If this occurs when the cycle is active the “FLAME” output L.E.D. indicator will go out and the display will read “bURNER CONTROL FAIL.
D. L.E.D. CODES 1.
2.
E. COMPUTER LOGIC and WIRING DIAGRAM 1. Operator enters desired selections. 2. Information entered is sent to the microprocessor (computer) via the keyboard (touchpad). 3. The input information is sorted, processed, and executed by the microcomputer chip. 4. The microcomputer output signal activates the contactors and HSI (Hot Surface Ignition) module which control machine functions.
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1. No Display Condition a. Check position of “EMERGENCY STOP” (E-Stop) to verify it is in operating position (pull or twist for operating position). b. Check fuse one (1) or two (2) and if either are blown, replace. c. Take voltage reading across the microprocessor (J7) 9-pin connector pins 1 and 2. If no voltage is present at pins 1 and 2, double check the secondary (24 VAC) side of transformer at the blower motor contactor number 13 to ground if no voltage is present check primary voltage to transformer.
If there is voltage, replace the coil or the complete contactor. If there is no voltage, check for voltage across the two (2) BS3 terminals on the arc suppressor (A.S.) board. If there is voltage across the two (2) BS3 terminals and no voltage across the coil of the reversing contactor (A1 and A2), the problem is faulty wires or terminations between BS1 and the contactor coil. d. If there is no voltage between the two (2) BS3 terminals on the arc suppressor (A.S.
c. If no voltage is present at J7 9-pin connector no. 4 to ground, but voltage is present at no. 3 to ground. The problem is a faulty switch, wires or termination between J7 to J8 and J8 to the lint switch no. 20 and 21. d. If no voltage is present at J7 9-pin connector no. 3 to ground, then voltage should not be present at no. 5 to ground. Replace the board. 6. Main Door Condition NOTE: Make sure main door and lint door are closed. Also, if checking either switch, the plunger must be depressed. a.
IMPORTANT MANUAL RESET HI-LIMIT INSTRUCTIONS FOR PHASE 6 MODELS This dryer was manufactured with a manual reset burner hi-limit and tumbler (basket)/lint chamber hi-limit thermostat which is monitored by the Phase 6 computer. If either manual reset thermostat is open prior to start of the drying cycle, the dryer will start momentarily and then shut down, the Phase 6 computer will display an error code with an audio indication.
SECTION VIII TECHNICAL INFORMATION The following section contains various technical information important to the service person in servicing and maintaining the dryer. A. MOTOR PLATE (HIGH and LOW VOLTAGE) The motor plate is located on the side of the drive motor (refer to illustration) and contains a graphical representation of the motor wiring for both low and high voltage ratings. Removing the cap reveals the wiring to the motor.
B. DATA LABEL Contacting American Dryer Corporation (ADC) When contacting ADC, certain information is required to ensure proper service and parts information. This information is on the data label, located on the top right corner of the dryer, viewed from the rear (refer to illustration). When contacting ADC, please have the model number and serial number readily accessible. Information on the Data Label a.
C. HOW TO USE A MANOMETER 1. With dryer in nonoperating mode, remove plug on the gas valve pressure tap. 2. Attach plastic tubing to pressure tap. Fitting is supplied with manometer (refer to illustration). 3. Attach manometer to dryer using magnet. NOTE: Place manometer in a position so that readings can be taken at eye level. 4. Fill manometer with water, as shown in illustration to the zero level. 5. Start dryer. With burner on, take a reading. a. Read water level at the inner tube.
D.
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