4.9
Variable Speed Fan (if fitted)
If fitted, the variable speed control is fitted in the air circulation fan circuit. A
panel mounted rotary dial is used to control the speed.
Please note that there is a minimum setting at which the fan motor starts up when the
product is switched on. It is recommended that the speed of the fan is not set below
50%, as there would be very little air flow around the chamber and also risk
overheating the fan motor.
4.10
Exhaust Fan (if fitted)
To operate the exhaust fan use the fan switch on the control panel; this is
only functional when the instrument switch is on.
The level of air exhaust can be controlled by adjusting the slider under the
exhaust box.
When the exhaust fan is turned on, there may be a drop in internal temperature before
the product recovers to the setpoint value.
The airflow should be adjusted to the minimum required by the process to reduce the
amount of energy wasted in heating air.
4.11
Stoving and Curing (if fitted)
The stoving and curing option adds an explosion relief panel and a powered
exhaust fan. With this option the exhaust fan operates continuously when
the product is switched on.
A pressure switch detects that there is sufficient air flow through the chamber. If the
pressure switch does not detect sufficient air flow, a fault light illuminates and heating
is disabled.
At least 610 mm free space must be left around the explosion relief panel to allow this
to break out if there is a rapid build up of pressure inside the chamber.
Please note that if the stoving and curing option is fitted, there may be an increase in
the power rating of the product. See the product rating label located on the side panel
of the product for correct power rating.
4.11.1
Pre-heater (if fitted)
Products with the stoving and curing option may also be fitted with a pre-heater that
pre-heats the incoming air to the same temperature set on the main controller.
The temperature of the pre-heater is controlled by the main controller, but measured
by a separate thermocouple.
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