830209G/160228
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Tekniske ændringer forbeholdes
- Technische Änderungen vorbehalten - Subject to Technical Modifications -
45
Optima 300
. Function
.1 Controller Optima 300
Room control:
Room temperature is controlled by room sensor T2,
which is mounted on the control panel. E.g., if the
temperature has been set to 21°C, the compressor will
start when the temperature falls to 20.6°C. When the
compressor has heated up the room temperature to
21.4, the compressor will stop. If the compressor cannot
maintain the room temperature, the motor valve (units
with water re-heating surface), will begin to control the
temperature (PID control) when the room temperature
has fallen to 20°C.
For units with electric re-heating surface divided into
four levels, the first level will switch in when the room
temperature has fallen to 20°C. E.g. if the regulator
time is set to 3 minutes, the room sensor will wait three
minutes and then measure whether the room temperature
is now above or below 20°C, level 2 will switch in. When
the room temperature eventually reaches 20°C, the
electric heating levels will begin to switch off at 3 minutes
interval. If the room temperature rises to 22°C, the by-
pass damper function will regulate to full open, which is
the temperature start cooling has been set to. If the by-
pass function is ON, the by-pass damper would normally
open, but if the temperature outside is (T3) 1° C higher
than the extracted air (T7), then the by-pass damper will
close to use the “free” cooling of the damper
To ensure that the by-pass and cooling function does
not switch in at a too low external temperature, a limit
temperature of e.g. 15°C may be programmed (point 8
in the operating menu). When cooling begins, the supply
and extract air fans will switch to speed 3 and the cooling
valve MA 7 will open, so that the condenser on the supply
air side becomes the cooling surface and the cooling
surface on the escaping air side becomes the condenser.
When the room temperature has decreased 1° C, the
compressor hand the fans will return to normal operation.
The cooling valve MA 7 will not shot down, when the by-
pass function has closed.
If extra cooling equipment is mounted on the unit, this will
switch in when the room temperature is 2°C higher than
start cooling. Units with electric pre-heating surface, will
perform control in the same way as the electric re-heating
surface.
Defrosting:
When the temperature difference between the
temperature upstream of the cooling surface and the
temperature of the cooling surface becomes too large,
as happens when ice is formed on the cooling surface,
the unit goes into defrost mode. The magnetic valve
MA 4 opens and the supply air fan and the electric
heating surface, stops until the ice has melted and the
cooling surface has reached a temperature of app.
5°C (depending on the set point in menu 50). Then the
magnetic valve closes again and the supply air fan and
electric heating surface resume operation.
. Extra capacity
Electric element:
If the heating need is larger than the coverage of the VP/
VPC, a supplemental electric element (option) may be set
to ON in the main menu with a short-cut key.
.3 Operation safety
High pressure switch:
To prevent the compressor exceeding its range of
application, there is an integral high pressure switch,
which interrupts when the pressure becomes too large.
Activate the red reset button once the cause of the error
has been identified.
Override control of supply air fan:
If the supply air temperature rises to over 45°C, the
speed of the supply air fan will begin to rise, in attempt to
stabilise the supply air temperature at 45°C.
Override control of extract air fan:
If the exhaust air temperature rises to over 45°C in
cooling mode and the extract air speed at level 3 is
not set to 100%, the extract air fan will increase speed
attempt to stabilise the exhaust air temperature at 45°C.
.4 Alarms
Filter timer
To ensure that the filters are changed, and an optimal
operation is maintained, the controller has a filter timer
(please se point 14 and 15). When the timer reaches
the chosen value the display will read “change filter” and
the red Genvex logo will flash until the filters has been
changed.
Data error
This error will be shown, if no communication is possible
between the display and controller. Please control the
cable connection on the clips 21 – 24.
Frost alert
This error is shown if a water coil is installed in the
system and the temperature of the water coil is to low.
Then there is a risk of frost damage. The controller will
stop the unit and open the valve to the water coil to keep
the coil warm.
Pressure switch error
When the high pressure switch interrupts, the display will
read “Pressure switch error” and the red Genvex logo will
flash until the red reset button is activated.
ENGLISH
