Wolf CT Hoods and DD Ventilation: Access & Removal

This section explains how to access and remove components from Wolf Pro Series ventilation products. Procedures are arranged to simulate the order in which components would need to be removed for access to other components. Referencing other component removal procedures may be necessary.

This section is divided into two parts: the first covers Models CTWH30, CTWH36, and IH4227; the second covers Downdraft Models DD30I/R, DD36I/R, and DD45I/R.

Before continuing, please note the WARNINGS and CAUTIONS below.

WARNING
TO AVOID ELECTRIC SHOCK, POWER TO A VENTILATION UNIT MUST BE DISCONNECTED WHENEVER ACCESSING AND/OR REMOVING COMPONENTS POWERED BY ELECTRICITY OR COMPONENTS NEAR OTHER ELECTRICAL COMPONENTS.

IF IT IS NECESSARY TO REMOVE A VENTILATION UNIT FROM ITS INSTALLATION, REMEMBER THAT THEY ARE HEAVY AND COULD FALL RESULTING IN SERIOUS INJURY OR DEATH. PULLING A UNIT FROM ITS INSTALLATION SHOULD ONLY BE PERFORMED BY A TRAINED AUTHORIZED SERVICE TECHNICIAN OR INSTALLER.

▲ CAUTION
Metal edges may be sharp. Use caution when servicing unit to avoid personal injury.

COMPONENT ACCESS AND REMOVAL FOR MODELS CTWH & IH

FILTER REMOVAL

See Caution at the beginning of this section.

From the underside of the wall hood, grab the filter handle and push back against the spring retainer, then pull down and out of the wall hood. (See Figure 4-1)

Figure 4-1 Filter Removal: Illustrates pulling the filter down and out after pushing back the spring retainer.

▲ CAUTION
Make sure the bulb is cool before touching. Halogen bulbs get hot instantly, and adjacent parts may retain heat. Do not touch replacement bulbs with bare hands. Use a paper towel or cloth when handling bulbs to keep oil from fingers from touching the bulb.

HALOGEN BULB AND LIGHT ASSEMBLY REMOVAL

See Caution above.

The halogen bulb can be removed without removing the lamp assembly. Use a small flat-bladed screwdriver or fingernails to pry out the metal retaining clip securing the lens to the lamp assembly, being careful not to damage the retainer or lens. (See Figure 4-2)

The halogen bulb has two metal electrodes that press into the socket of the lamp assembly.

To remove the light assembly, the filters must be removed first:

1. Reach inside the hood cavity behind the lamp assembly, depress the retaining clips, and push the lamp assembly through the lamp-holder support.
2. Turn the lamp assembly 90 degrees and slide it through the clearance slots in the lamp-holder support.
3. With wire cutters, cut the wire leads leading to the lamp assembly.
4. Splice wires from the new lamp assembly to the wire harness. Use shrink wrap to seal the wire splice.

Figure 4-2 Lens Retainer Clip Removal: Shows using a screwdriver to remove a retaining clip from the lens.

Figure 4-3 Lamp Assembly Removal: Depicts removing the lamp assembly by pushing it through the support.

Access & Removal - CT Hoods and DD Ventilation

WARNING
TO AVOID ELECTRIC SHOCK, POWER TO THE VENTILATION UNIT MUST BE DISCONNECTED WHENEVER PERFORMING THE FOLLOWING REPAIRS.

HEAT SENTRY REMOVAL

Refer to all WARNINGS and CAUTIONS at the beginning of this section.

The heat sentry is located behind the lamp-holder support and is held in place by a retaining clip.

The heat sentry activates when the exhaust temperature reaches 206°F (97°C), signaling the blower motor to start or increase to the next highest speed. The corresponding LED will flash on and off to indicate Heat Sentry Mode.

To remove the heat sentry, the filters must be removed first (See Figure 4-4):

1. Reach inside the hood cavity on the backside of the lamp-holder support, locate the heat sentry, and pull it out from under the retaining clip.
2. Disconnect the wire leads from the heat sentry.

Figure 4-4 Lamp-holder Support Removal: Shows removing screws and the heat sentry from the lamp-holder support.

LAMP-HOLDER SUPPORT REMOVAL

The lamp-holder support provides a mounting surface for the lamp-holder assemblies and heat sentry. The front edge has tabs that fit into slots in the wall hood frame, and two screws in the opposite corners secure the support to the wall hood.

To remove the lamp-holder support, the filters, heat sentry, and lamp assemblies must be removed first (See Figure 4-4):

1. Extract screws from the corners of the lamp-holder support. (See Figure 4-4)
2. Pull the lamp-holder support away from the front edge of the wall hood until the tabs release from the slots, and remove from the unit.

USER INTERFACE SWITCH MOUNTING BRACKET REMOVAL

The user interface switch is mounted to a bracket located on the front right side of the wall hood. Screws secure the mounting bracket to the interior of the wall hood cavity.

To remove the user interface switch mounting bracket, the filters and lamp-holder support must be removed first (See Figures 4-5 & 4-6):

1. Extract the screws securing the user interface switch mounting bracket to the wall hood frame.
2. Pull the control panel assembly out of the wall hood.
3. Extract screws securing the user interface switch to the mounting bracket.

Figure 4-5 Control Panel Bracket Removal: Shows removing screws from the control panel bracket.

Figure 4-6 Removing Control From Bracket: Illustrates removing the control from its bracket.

Access & Removal - CT Hoods and DD Ventilation

WARNING
TO AVOID ELECTRIC SHOCK, POWER TO THE VENTILATION UNIT MUST BE DISCONNECTED WHENEVER PERFORMING THE FOLLOWING REPAIRS.

RIBBON CABLE REMOVAL

Refer to all WARNINGS and CAUTIONS at the beginning of this section.

The user interface switch consists of a plastic housing containing the circuit board and push buttons, and a clear plastic plate that secures the push buttons and the control ribbon. Screws secure the clear plastic plate to the housing.

To remove the control ribbon and/or replace the circuit board, the filters, lamp holder support, and the user interface switch mounting bracket must be removed first (See Figure 4-7):

1. Extract the screws securing the clear plastic plate to the housing.
2. Lift the control circuit board out of the housing.
3. With thumb and forefinger, grasp the ribbon cable connector and disconnect it from the circuit board.

Figure 4-7 User Interface Switch Bracket Removal: Shows where to grab and remove the ribbon cable connector.

POWER OUTLET REMOVAL

Refer to all WARNINGS and CAUTIONS at the beginning of this section.

To access the power outlet, the lower section of the telescoping chimney flue must be raised and temporarily secured. The outlets are located on the top left front of the hood frame and are secured with spring clips.

To remove the power outlets (See Figure 4-8):

1. Raise the lower section of the chimney flue off the hood frame and temporarily secure it.
2. Disconnect electrical leads from the outlet.
3. With fingers, depress the spring clips on the sides of the outlet and push it through the hood frame.

Figure 4-8 Power Outlet Removal: Illustrates depressing tabs to remove the power outlet.

Access & Removal - CT Hoods and DD Ventilation

WARNING
TO AVOID ELECTRIC SHOCK, POWER TO THE VENTILATION UNIT MUST BE DISCONNECTED WHENEVER PERFORMING THE FOLLOWING REPAIRS.

TRANSFORMER REMOVAL

Refer to all WARNINGS and CAUTIONS at the beginning of this section.

To access the transformer, the lower section of the telescoping chimney flue must be raised and temporarily secured. The transformer is located on the top right side of the hood frame and is secured with screws.

To replace the transformer (See Figure 4-9 & 4-10):

1. Raise the lower section of the chimney flue off the hood frame and temporarily secure it.
2. Extract screws securing the transformer wire cover to the transformer and remove the cover.
3. With a flat-bladed screwdriver, loosen the set screws securing wires to the transformer terminals. Pull wire leads out of the transformer.
4. Extract the screw from the front of the transformer. Slide the transformer out from under the mounting bracket.

Figure 4-9 Transformer Removal: Shows the location of screws and the wire cover for transformer removal.

Figure 4-10 Disconnect Wire Harness: Illustrates disconnecting the wire harness from the transformer terminals.

FUSE REMOVAL

Electrical shock hazard. Refer to WARNING at the beginning of this section.

To access the fuse, the lower section of the telescoping chimney flue must be raised and temporarily secured. The control box is on the upper right side of the hood frame. The fuse is in a fuse holder inside the control box.

To remove the fuse:

1. Raise the lower section of the chimney flue off the hood frame and temporarily secure it.
2. Extract screws securing the control panel cover to the control box and remove the cover. (See Figure 4-11)
3. Grasp the top section of the fuse holder with fingers and turn counterclockwise. Pull the cap and fuse out of the fuse holder. (See Figure 4-12)

Figure 4-11 Control Box Cover Removal: Shows removing the control box cover.

Figure 4-12 Fuse Removal: Depicts removing the fuse from its holder.

COMPONENT ACCESS AND REMOVAL FOR MODEL CTEW

WARNING
TO AVOID ELECTRIC SHOCK, POWER TO THE VENTILATION UNIT MUST BE DISCONNECTED WHENEVER PERFORMING THE FOLLOWING REPAIRS.

▲ CAUTION
MAKE SURE BULB IS COOL BEFORE TOUCHING. HALOGEN BULBS GET HOT INSTANTLY AND ADJACENT PARTS MAY RETAIN HEAT.
DO NOT TOUCH REPLACEMENT BULB WITH BARE HANDS. USE A PAPER TOWEL OR CLOTH WHEN HANDLING BULB TO KEEP OIL FROM FINGERS FROM TOUCHING BULB.

HALOGEN BULB REMOVAL

See Caution above.

The halogen bulb can be removed without removing the lamp assembly. Use a small flat-bladed screwdriver or fingernails to pry out the metal retaining clip securing the lens to the lamp assembly, being careful not to damage the retainer or lens. (See Figure 13)

The halogen bulb has two metal electrodes that press into the socket of the lamp assembly.

Figure 4-13 Bulb Lens Removal: Shows using a screwdriver to remove a retaining clip from the lens.

FILTER REMOVAL

1. Lower the drop plate by pulling down on the front edge to dislodge it from the snap fasteners and allow it to hinge down and back.
2. Place a finger under the filter latch and pivot the latch forward and down until the front of the filter is allowed to freely drop out of the filter opening.
3. Lean the filter down and out of the 2 slots in the back of the filter opening. (Figure 14)

Figure 4-14 Filter Removal: Illustrates the steps for removing the filter.

DROP PLATE REMOVAL

1. Pull down on the front edge of the drop plate to dislodge it from the snap fasteners.
2. Using a Phillips screwdriver, remove the (4) hinge screws as shown in Figure 15.

To prevent damage, support the plate with one hand while removing the screws with the other.

Figure 4-15 Drop Plate Hinge Screws: Shows the location of the hinge screws for the drop plate.

HOOD INNER PANEL REMOVAL

1. Remove Drop Plate and Filter(s). (See previous page)

▲ CAUTION
ALWAYS WEAR GLOVES WHEN HANDLING SHEET METAL DUE TO THE POSSIBILITY OF SHARP EDGES.

HOOD INNER PANEL REMOVAL (CONT.)

WARNING
TO AVOID ELECTRIC SHOCK, POWER TO THE VENTILATION UNIT MUST BE DISCONNECTED WHENEVER PERFORMING THE FOLLOWING REPAIRS.

1. Locate the (3) screws fastening the front of the shroud to the hood frame. Using a Phillips screwdriver, remove the screws as shown in Figure 4-16.

To prevent damage, support the panel with one hand while removing the screws with the other.

2. Locate the (3) screws fastening the back of the panel to the hood frame. Using a Phillips screwdriver, remove the screws as shown in Figure 4-17.
3. Slowly lower the panel until the Molex plug for the Heat Sentry (see Figure 16) is exposed and disconnect the plug.

Figure 4-16 Inner Panel Front Screws: Shows the location of screws on the front of the inner panel.

Figure 4-17 Inner Panel Rear Screws: Shows the location of screws on the back of the inner panel.

LAMP SOCKET REMOVAL

1. To remove the light socket assembly, the drop plate, filters, and inner shroud must be removed first (See procedures above).
2. Disconnect the Molex plug for the Lamp Socket to be removed.
3. Reach inside the hood cavity above the lamp assembly, depress the retaining clips, and push the lamp assembly through the lamp-holder support.

If necessary, turn the lamp assembly until you can slide it through the clearance slots in the opening in the hood.

Figure 4-18 Lamp Socket: Illustrates depressing retaining clips to remove the lamp socket.

CONTROL PANEL REMOVAL

1. To remove the Control Panel, the drop plate, filters, and inner shroud must be removed first (See procedures above).
2. Disconnect the Communication Cable from the back of the Control Panel. (Figure 19)
3. Locate and remove the screws that fasten the Control Panel to the hood.

The screws (2 for Wall Hoods, 4 for Island Hoods) are the only fasteners holding the Control Panel. The Control Panel will fall if not supported as screws are removed.

Figure 4-19 Control Panel Removal: Shows removing screws that fasten the control panel.

INTERNAL BLOWER REMOVAL

WARNING
TO AVOID ELECTRIC SHOCK, POWER TO THE VENTILATION UNIT MUST BE DISCONNECTED WHENEVER PERFORMING THE FOLLOWING REPAIRS.

▲ CAUTION
ALWAYS WEAR GLOVES WHEN HANDLING SHEET METAL DUE TO THE POSSIBILITY OF SHARP EDGES.

1. Disconnect electrical supply. (see WARNING above)

For Island Hood Internal Blower Removal, skip to Step 6. The motor connector is located inside the motor housing and should be disconnected there.

2. Slide the bottom section of the chimney flue up to gain access to the controls. (See Figure 20)
3. Remove the Control Board housing cover, cable clamp, and cable tie that secure the motor harness. Unplug CN1 by gripping the connector and pulling straight out. (See Figure 21)
4. Remove the nut from the grounding stud and free the blower ground wire. (See Figure 21)
5. Feed the blower wire harness and ground wire down through the wire routing hole. (See Figure 22)
6. Remove the Drop Plate and Filter(s) (Page 4-7).
7. Remove the Inner Panel.

Do not forget to unplug the Heat Sentry once Inner Plate screws are removed.

8. Remove screws (4) that fasten the bottom bracket to the hood. (See Figure 4-23)

Figure 4-20 Control Panel Location: Shows the location of the control panel.

Figure 4-21 Motor Connector and Ground Wire: Illustrates disconnecting the motor connector and ground wire.

Figure 4-22 Connector: Shows the connector for the wire harness.

Figure 4-23 Bottom Bracket Screws: Depicts the location of the bottom bracket screws.

INTERNAL BLOWER REMOVAL (CONTINUED)

1. Remove the wing-nuts on either side of the blower housing. (See Figure 24)
2. While supporting the blower, remove the screws (Figure 25). Once the screws are removed, the blower can be lowered out of the hood.

You will need to rotate the blower assembly slightly within the hood to attain the correct orientation for removal.

Do not lose the tubular screw spacers that are inside the rubber mounts. These spacers prevent the possibility of crushing the rubber mount during reinstallation.

Figure 4-24 Blower Mounting Wing-nuts: Shows the location of the wing-nuts for blower mounting.

Figure 4-25 Blower Mounting Screws: Illustrates removing the screws for blower mounting.

CONTROL BOARD REMOVAL

WARNING
TO AVOID ELECTRIC SHOCK, POWER TO THE VENTILATION UNIT MUST BE DISCONNECTED WHENEVER PERFORMING THE FOLLOWING REPAIRS.

▲ CAUTION
ALWAYS WEAR GLOVES WHEN HANDLING SHEET METAL DUE TO THE POSSIBILITY OF SHARP EDGES.

1. Disconnect electrical supply. (see WARNING above)
2. Slide the bottom section of chimney flue up to gain access to the controls. (See Figure 20)
3. Remove the Control Board housing cover and unplug electrical connectors.

Mark wire connectors as you remove them to ensure proper connection on the replacement board.