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Bosch
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WTVC
Repair Instruction
33 pgs4.76 Mb0

Bosch WTVC Repair Instruction

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2.4 AQUASTOP® (aqua secure)................................................ 4
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1 SAFETY
c Danger of electric shock.
h Danger of fire or explosion from gas.
h WARNING Modern appliances are very powerful and use high
technology devices to safely control that power. Failure to use the correct procedures and the approved parts can create serious hazards for the person servicing the appliance and for the user of an appliance with a bad repair. If you do not know
how to service the appliance, do not attempt to do so!
To avoid the risk of serious injury or death while servicing these appliances:
h Be certain that all power is removed from the appliance before
beginning service.
h Carefully follow all servicing instructions. Verify the instructions
if there are any that you don't fully understand.
h Read and heed all Cautions and Warnings on the appliance
and those with the replacement parts.
h Use caution and proper protective gear when handling chassis
panels. Some of the edges that are not normally exposed may be very sharp.
To avoid risk of serious injury or death to the users of the appliances:
h Carefully follow all service instructions.
h Use only parts authorized for the application.
h Know the testing requirements needed to verify the safety of
the service action.
h Use proper, calibrated test equipment.
h Do all indicated safety tests and record results.
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2 INSTALLATION
2.1 Basic installation
Dryers shall be installed according to national and local codes.
2.2 Exhaust vents
2.2.1 Locating exhaust vent
Vent is factory installed to the rear of dryers. Rear factory vent can be changed to the bottom or right side using kits (sales accessories).
2.2.2 Installing vent ducts
For best drying, use shortest possible duct length and fewest # of elbows.
Use the table below when selecting ducting.
# 90º Turns / Maximum Length
Elbows Rigid Duct Flexible Duct
0 20 m 14 m 1 17 m 11 m 2 14.5 m 9 m 3 12 m 7 m 4 9 m 5 m
2.3 Feet (leveling legs)
Using a level front to back and side to side, adjust feet (leveling legs) until dryer is level. When moving dryers, screw in feet completely before moving dryers to avoid damage.
To adjust feet (leveling
legs), rotate left to right to lower dryer.
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2.4 AQUASTOP® (aqua secure)
AQUASTOP® water inlet hoses prevent water from leaking. They
connect like standard hoses with no special installation needed. If an inner hose ever should leak, the hose shuts off and it’s indicator shows red. Hoses are one-time and must be replaced when indicators are red.
2.5 General installation warnings
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3 OPERATION
3.1 Controls
Controls are shown below. Rotate the knob to the desired drying program and push the Start/Pause button.
There are option buttons for delicate fabrics and saving energy. Dryer status is shown in LED’s at the left of the display.
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4 COMPONENTS
4.1 WTVC Gas Dryer Components
Basic components are control module, gas burner, gas igniter, flame sensor, drive motor with fan, two NTC temperature sensors, two hi­limit temperature protectors, moisture sensor and broken belt switch.
Gas dryers are set up for natural gas and can be converted to LP using a kit (WTZ1280).
4.1.1 Gas burner assembly
Burner assemblies include an NTC temperature sensor and a manually resettable hi-limit temperature protector. The NTC is mounted at the rear of the assembly near where it attaches to the vent.
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Push button to reset Hi-limit
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limit
p
rotector.
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4.1.2 Drive motor
4.1.3 Gas valve
The gas valve, whether natural gas or LP, includes the appropriate regulator and jet (orifice).
4.1.4 Burner
The burner mounts next to the gas valve jet (orifice). A burner ring is used for natural gas dryers to optimize performance.
The gas dryer burner circuit runs through the motor & Hi-limit. The connection through the motor cuts out the burner if the motor isn’t running.
Motor is rated 120 VAC, 60 Hz, 1/3 HP (248.5 W), 5.0 A, 1725 RPM, 40ºC ambient, class B insulation. It drives the fan (in front) and drum (in rear, using pulley shown).
Drum
belt
pulley
Fan
wheel
shaft
Burner
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4.1.5 Gas leak testing (using soapy water)
Whenever gas connections are changed or disturbed, they should be checked for leaks using a soapy water solution.
1. Reconnect all gas connections and turn on the gas supply to the dryer, using household gas inlet pressure.
2. Apply soapy water solution with a spray bottle. Spray union and brass connections completely.
3. Watch connections carefully for about two minutes. If there is a leak, bubbles will form in the area of the leak. Soapy water will not stay on connections long, so spray more solution on them when soapy water isn’t visible.
4. If bubbles form around the union, tighten the connection and repeat steps 3 and 4 until no bubbles form.
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5. If bubbles form around the brass connector or on the gas valve itself, replace the leaking valve with a new one and repeat steps 3, 4 and 6.
6. Clean all soapy water solution with a rag or paper towel.
7. Never use a flame to check for gas leaks!
4.1.6 Igniter
Igniters glow after
4.1.7 Flame sensor
Flame sensors detect flame out in 30 – 60 seconds and direct the igniter to reignite flames.
4.1.8 Lint screen sensors
The front (bearing) shield contains two sensors – accessible after the lint screen is removed. Along with the heater NTC and hi-limit protector, the lint screen NTC and hi-limit protector provide temperature regulation and safety.
30 seconds, reliably igniting gas flames.
Igniters can be damaged if not handled with care.
Hi-limit NTC
Hi-limit
NTC
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4.1.9 Broken belt switch
The broken belt switch prevents the dryer from running if the belt has broken or been left disconnected. It must be manually reset (by pushing the left plunger in (viewing rear of dryer) – the dryer will not run if the switch hasn’t been reset.
4.1.10 Air exhaust duct
Air exhaust duct connects to the fan and allows exhausting through the rear of dryers. Using kits (sales accessories), dryers can be vented out the bottom or right side.
Fan
Vent
Push left plunger (toward right) to reset broken belt switch whenever drum or belt has been removed for
any repair.
4.1.11 Fascia (control) panel
Fascia panel includes the knob, which is factory built into the panel and cannot be obtained separately. Buttons can be obtained separately.
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4.1.12 Moisture sensor
Moisture sensor consists of two electrodes (located just left of the lint screen on the front bearing shield). Moisture from clothes completes the circuit between the two sensors, showing clothes aren’t dry. Placing the moisture sensor on the front shield eliminates sensors inside drums and conductance brushes outside drums.
4.1.13 Door switch
Door switch engages the door, turning the light on and off and notifying the dryer the door is closed for drying. To remove it, push the two latches inward and slide the switch toward the front of the dryer.
4.1.14 Fan wheel replacement
Even though WTVC and WTMC dryers use the same fan motor, they do not use the same fan. Due to differing front bearing shield and lint screen dimensions, air flows differently through the two dryers. Dryer control software for each dryer is carefully matched to each fan to provide the same drying results.
WTMC fan 491640 hasn’t been tested in WTVC dryers and WTVC fan 648683 hasn’t been tested in WTMC dryers. Fans must not be interchanged because it will void the warranty, will affect the UL certification, will affect drying and may generate error codes.
4.1.15 Mist care (on selected dryers)
Mist care (on selected dryers) sprays a mist of water into dryers to refresh clothing and relax any wrinkles. Water sprays occasionally as needed, determined by the control.
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