VERDER CARBOLITE GERO HRF 7/112, Инструкции по установке, эксплуатации и обслуживанию

Страница: 19 / 28

7.4 Solid-state Relay Replacement
Disconnect the product from the power supply and remove the
appropriate cover as given above.
1. Make a note of the wire connections to the solid state relay, then disconnect them.
2. Remove the solid state relay from the base panel or aluminium plate.
3. Replace and reconnect the solid state relay ensuring that the bottom of it has good
thermal contact with the base panel or aluminium plate.
4. Replace the access panel.
7.5 Thermocouple Replacement
Disconnect the product from the power supply. Remove terminal cover to
gain access to the thermocouple connections. Make a note of the
thermocouple connections.
Thermocouple cable colour codings are:
Thermocouple Leg Colour
positive (type K) green
negative white
1. Disconnect the thermocouple to be replaced from its terminal block and withdraw
it.
2. Re-assemble the new thermocouple, observing the colour coding.
3. Refit the element access panel.
7.6 Element Replacement
See section 7.2 - wearing a face mask is required.
The resistance wire elements are able to withstand temperatures considerably higher
than the limit for this furnace and are expected to fail infrequently or not at all.
In the event of the need for replacement, it is recommended that the furnace roof be
removed and the stainless steel liner lifted out. The furnace upper back panel should be
removed to allow access to the terminal blocks.
Element replacement is then straightforward, if the following hints are observed:
l
when disconnecting elements from the porcelain terminal blocks, use two spanners
and do not over tighten, to avoid cracking the blocks.
l
to feed element tails through the back insulation, first push through the insulation,
from the back, lengths of thin polythene tubing; slip the element tails into the tube
and ease the tube with the tails backwards through the insulation.
19
7.0 Repairs and Replacements