Zhermack FURNACE DM 30, User Manual

Page: 163 / 272

FURNACE DM
163 of 272
MAINTENANCE AND USE MANUAL
EN
The switched-on aspirator (optional) starts/stops automatically during oven operation / shutdown. The
operator can, nevertheless, program aspirator shutdown temperature during Data Programming (see
section 7.3.1 point I).
In fact, once the third parameter (holding time) of PHASE 5 has been entered press ENTER (28) to save the
data that will then be set.
The display (11) shows “FAn” 300.
The figure “300” indicates the temperature (in °C) at which the fan automatically stops working.
This data is entered by technicians at Zhermack during final oven testing. Should the operator so desire,
he/she may vary this setting between a minimum of 0°C and a maximum of 700°C.
As a guideline, this setting should not be any higher than 400°C because, while air flow from the melting
chamber is only minimal, it is good practice to prevent withdrawal of heat as this delays attainment of high
temperatures.
7.4
USING THE ASPIRATION UNIT
Programming of the fan shutdown temperature is only effected, of course, where the
oven has an aspirating flue.
As regards aspirator positioning and connection, observe the instructions in sections
6.3 and 6.4.1. carefully.
7.4.1
Routine mode
To fire fast linings the suction unit needs to be set up in a special way.
When setting the program, after setting the 5 firing phases, the word “Fan” appears on the display
followed by 4 zeros. If, in this phase, a temperature higher than 700°C is set the word “Fast” appears
on the display to indicate operation of suction unit with fast linings. During execution of the program,
when the set temperature is reached and the material is inserted in the oven, closing the door
automatically activates the suction unit for about 30 minutes so as eliminate any fumes that develop
in the chamber.
The set temperature will nevertheless be guaranteed.
7.4.2
“Fast” mode
Delayed oven start must be programmed after the melting program has been set (see section 7.3).
A. With the oven OFF, press START-STOP (20). The word “tImE” appears on the display (11).
7.5
DELAYED START
The extraction fan comes on at the beginning of phase 2 and goes off when the power supply to the
oven is cut.
7.4.3
EXTRACTION FAN