Incorrect installation may cause other oven components to fail.

Transcription

1 / E4S Incorrect installation may cause other oven components to fail. Description of Change: This details the procedure for changing the door seal on any 402s & eikon e4 oven. This should be performed when a door seal has become damaged, failed, deteriorated or when upgrading from narrow to wide section seal, (402s Only). This upgrade will require the oven to be relatively cool to remove the old seal & once the new seal has been fitted a cure time of 2 hours with the oven hot ft overnight with oven door in the closed position and ed off before operation of the oven can begin. Parts Required: PSA3113 Door seal HT Tool Required: No1 Pozi Screwdriver 31Z0186 Black Silastic CAF 30 Craft Knife 31Z3094 M3 x 12 CSK Screw Flat blade screwdriver Sealant gun Prior to carrying out this modification please ensure you read and understand the safety code contained within the service manual. Process for carrying out modification / Change: Cool down the oven then isolate from the mains supply by disconnecting the plug or locking in the off position the isolation if the oven is hard wired. Remove the lid and side panels to access the oven components. Undo the door skin retaining screws (x 10) & carefully remove from the oven door main body along with the insulation blanket. 1

2 Process for carrying out modification / Change: Using a sharp craft knife cut into the existing seal and run the blade along the length keeping pressure down onto the door surface. Once you have gone around all 4 sides you should be able to remove the old seal to expose the Silastic below. Using a flat bladed screwdriver push through the Silastic between the slot from the side where the insulation was previously situated, when you have cleared all slots of Silastic you are then ready to fit the new door seal. Fit the new door seal by clipping in the 4 corners then close the door to clamp the seal against the cavity & the door body. With the door closed use Silastic CAF30 (black) to fill in the gaps behind the seal, ensure you add enough Silastic to fill the length of each slot and create a mushroom effect. Open the door and check the seal has not moved, if so square the seal to the door body. NOTE: if any Silastic has squeezed beyond the seal on the cavity side remove with a damp cloth. 2

3 Process for carrying out modification / Change: With the door closed re-fit the side panels and lid and then reconnect to the mains supply. Heat the oven to 275 C and run for 2 Hours - Ensure the oven is NOT used for cooking or any other program is used during this time. After 2 hours the sealant should have cured, disconnect the oven from the main supply once again and allow to cool. Remove the lid & side panels, re-fit the door insulation wrap. Re-fit the door skin to the door frame, apply a single drop of thread lock 243 to the door frame cage nuts the secure the door skin in place with 10 x M3 x 12 CSK screws. The recommended torque setting for this application is 0.22Nm. T 0.22Nm With the oven door now fully re-assembled check the door seal is still being clamped all the way around the cavity face and no gaps are visible. Check the door interlocks have not been affected by following the door interlocks set up procedure detailed on the following pages. Once the micro set up has been completed, fit the side panels and lid and connect to the mains supply. Carry out the oven re-commissioning. Place a water load of around 275ml inside the oven cavity and run a program of microwave without convection heat to perform microwave emission test. Using a Holaday or equivalent microwave emissions probe check the areas detailed on page 8. Ensure the microwave emissions seen are below permissible limit of 5mW/cm² Remove the water load from the cavity. The oven is now ready for use. 3

4 Process for carrying out modification / Change: PROCEDURE FOR DOOR INTERLOCK ADJUSTMENT AND TEST 1 The door on the 402s oven is monitored by 4 microes. 3 are used in the conventional Primary, secondary and Monitor arrangement shown below and the 4th sends a signal to the logic PCB Door Interlock Arrangement: Switches shown in Door Closed position RHS LHS L1 Power In Primary Monitor Secondary Power Out L2 Logic PCB Monitor Switch The monitor will produce a short circuit across the mains supply when the door is opened if the primary interlock is faulty, thus blowing the microwave fuse and rendering the oven inoperative. Primary Interlock & Secondary Interlock The primary will cut off the microwave emissions from the oven when the door is opened by breaking the electrical supply circuit to the transformers. The secondary interlock will cut off the microwave emissions if the primary has failed. Note: If operation of the monitor has caused the microwave fuse to blow, the primary and monitor microes must be changed as they may have been damaged by the high short-circuit currents involved. Left Hand Side Switch assembly Right Hand Side Switch assembly SW4 SW3 SW1 SW2 Door closed Secondary Monitor Primary Logic PCB 4

5 Process for carrying out modification / Change: / E4S PROCEDURE FOR DOOR INTERLOCK ADJUSTMENT AND TEST 1 The door on the e4 oven is monitored by 3 microes. They are used in the conventional Primary, secondary and Monitor arrangement shown below. Door Interlock Arrangement: Switches shown in Door Closed position RHS LHS L1 Power In Primary Monitor Secondary Power Out L2 Monitor Switch The monitor will produce a short circuit across the mains supply when the door is opened if the primary interlock is faulty, thus blowing the microwave fuse and rendering the oven inoperative. Primary Interlock & Secondary Interlock The primary will cut off the microwave emissions from the oven when the door is opened by breaking the electrical supply circuit to the transformers. The secondary interlock will cut off the microwave emissions if the primary has failed. Note: If operation of the monitor has caused the microwave fuse to blow, the primary and monitor microes must be changed as they may have been damaged by the high short-circuit currents involved. Left Hand Side Switch assembly Right Hand Side Switch assembly SW3 SW1 SW2 Secondary Monitor Primary 5

6 Process for carrying out modification / Change: PROCEDURE FOR DOOR INTERLOCK ADJUSTMENT AND TEST 2 It is vital that the microes are adjusted to the correct position. There are two sets situated either side of the door. The interlocks ensure that the oven will not operate microwave with the door open. WARNING - Before adjusting the micro assemblies ensure that the oven has been isolated from the electrical supply. Please note the terminals on the microes remain live when the oven is ed off, so complete isolation is essential. With a 2mm spacer located as shown both es on both sides should be activated/closed position. With a 4mm spacer located as shown SW2 & SW3 should be open. Spacer Door seal Door By loosening the 4 screws on each mounting bracket the micro assembly can be raised or lowered and thereby the es can be made to operate at different door positions. Isolate the oven from the electrical supply. Place a 2mm spacer between the cavity face and the door seal. Working on the right hand side adjust the bracket so the SW2 just operates. Working on the left hand side adjust the bracket so that SW3 just operates. Remove the 2mm spacer & then place a 4mm spacer in the same position. Check that SW2 & SW3 are open circuit and not operated. Repeat the steps above to ensure the set up is correct. Micro bracket adjustment screws Micro bracket height adjustment 6

7 Process for carrying out modification / Change: / E4S PROCEDURE FOR DOOR INTERLOCK ADJUSTMENT AND TEST 2 It is vital that the microes are adjusted to the correct position. There are two sets situated either side of the door. The interlocks ensure that the oven will not operate microwave with the door open. WARNING - Before adjusting the micro assemblies ensure that the oven has been isolated from the electrical supply. Please note the terminals on the microes remain live when the oven is ed off, so complete isolation is essential. With a 2mm spacer located as shown both es on both sides should be activated/closed position. With a 4mm spacer located as shown SW2 & SW3 should be open. Spacer Door seal Door By loosening the screws on each mounting bracket the micro assembly can be raised or lowered and thereby the es can be made to operate at different door positions. Isolate the oven from the electrical supply. Place a 2mm spacer between the cavity face and the door seal. Working on the right hand side adjust the bracket so the SW2 just operates. Working on the left hand side adjust the bracket so that SW3 just operates. Remove the 2mm spacer & then place a 4mm spacer in the same position. Check that SW2 & SW3 are open circuit and not operated. Repeat the steps above to ensure the set up is correct. Micro bracket adjustment screws Micro bracket angle adjustment 7

8 Process for carrying out modification / Change: Microwave emissions test process Using a microwave test unit, move the probe over the areas highlighted in yellow at a speed of around 10cm/sec Ensure the emission value is not greater than 5 mw/cm² at any point. 8