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Technical Service Bulletin:

 

Triac Printed Circuit Board Replacement

TRONIC 5000C Pro Models:

 

WH17, WH27, WH36

Introduction

 

 

WARNING

ELECTRICITY IS EXTREMELY DANGEROUS. 
TAKE EXTRA PRECAUTIONS AND ENSURE  ALL 
CIRCUIT BREAKERS ARE OFF BEFORE 
PERFORMING ANY WORK ON THE HEATER

 

 

 

WARNING

THE FOLLOWING PROCEDURE MUST BE 
PERFORMED BY A LICENSED ELECTRICIAN

 

Tools Required

 

Electrical meter

 

Phillips head screwdriver 

 

Small flat head screwdriver 

 

Heat sink paste

  Replacement of the triac printed circuit board will be 

easier if you can work slightly above the unit.

Preparation

1.  Remove the four cover screws and retain, lift off the cover and 

store safely.

2.   Using an electrical meter, con

fi

 rm power is off the the heater.

Removing the triac wiring

1.   Remove the thin white signal wires from the printed circuit 

boards by gently bending the locking tab on the connector with 
a small 

fl

 at head screwdriver so that the plug can be removed 

(Fig. 1). These cables can be moved out of the working area.

                   

Fig. 1

2.  Using the small 

fl

 at head screwdriver pull the ¼" push on 

connectors off the triac printed circuit boards (Fig. 2). The 
recommended method is to use a small 

fl

 at head screwdriver in 

the rectangular hole and then push the screwdriver blade so that 
the connector pulls off straight.

                   

Fig. 2

Summary of Contents for TRONIC 5000C Pro

Page 1: ...tly above the unit Preparation 1 Remove the four cover screws and retain lift off the cover and store safely 2 Using an electrical meter confirm power is off the the heater Removing the triac wiring 1 Remove the thin white signal wires from the printed circuit boards by gently bending the locking tab on the connector with a small flat head screwdriver so that the plug can be removed Fig 1 These ca...

Page 2: ...a magnetic bit will make this easier as the screws and washers will lift out easily Fig 5 Retain these screws and washers for refitting The white paste on these parts is normal and is used to transfer heat from the triac to the brass head Avoid getting it onto clothing and wipe wash from hands before eating or drinking Fig 3 Fig 4 27kW 36kW Only Fig 5 2 Using the small flat head screwdriver gently...

Page 3: ...ING THE THERMAL CUT OUT TO TRIP Fig 8 2 Reassemble the printed circuit boards to the moulding by slotting in one end and then rotating clockwise to click into the latch on the moulding Fig 9 10 Fig 9 Dual triac printed circuit board Slot in here Snap in here Fig 10 Single triac printed circuit board Slot in here Snap in here 3 Using the Phillips head screwdriver ideally with a magnetic bit insert ...

Page 4: ...bly Short Blue element wire Right hand assembly Short Black element wire Left hand assembly Blue terminal block wire Right hand assembly Black terminal block wire Short Brown element wire Fig 13 27kW only Short Grey element wire Grey terminal block wire Fig 13 27kW only Short Grey element wire Grey terminal block wire Fig 14 Grey terminal block wire Short Grey element wire 36kW Only Left hand asse...

Page 5: ...ins and not offset or the heater will not work properly Refitting the cover 1 Before refitting the cover perform a once over check Are all connections made correct to the wiring diagram for this model Are all connections tight Is there evidence of the heat transfer paste being squeezed out from under each of the triac switches where they have been clamped 2 Refit the cover using the 4 screws ensur...

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