1.09.610ENG/14.9.2015
Vallox Oy • Myllykyläntie 9-11 • FI-32200 Loimaa • Tel. +358 10 7732 200 • www.vallox.com
© VALLOX • We reserve the right to make changes without prior notice
Vallox Slim-Line
PTXPA MC COOKER HOOD
MC CONTROLLER
Put the speed knob to position 1 and detach
the knob with a screwdriver or similar.
There are adjustment and measurement
holes below the knob.
Measure voltage at the - and S contacts,
adjust speed 1 for instance
at potentiometer 1.
Put the knob back in place, turn the knob
to the following speed position and detach
the knob again.
You can also carry out the measurement at
the terminal block, in locations shown in the
electrical diagram.
Indicator light
The indicator light (A) shown in Figure 1 is lit when the MC ventilation unit
controlled by the hood is operating. If the indicator light blinks at one-second
intervals, the ventilation unit reminds you of the need for maintenance. The reminder
is shown every six months. The maintenance reminder is reset when the cover of
the ventilation unit is opened. Explanations for other cases where the indicator light
blinks in fault situations are given in the instructions of the ventilation unit.
The indicator light is not in use if the cooker hood is used to control roof fans or
other ventilation unit or if the indicator light is not connected to the ventilation unit.
Adjustment of fan speeds
A low signal voltage comes to the controller, which means that the adjustment can
be made when the controller is connected and the ventilation unit is in operation.
• The adjustment is conducted in the four holes below the controller knob
(Figure 2) one speed at a time, at the potentiometer corresponding to each
speed.
• The voltage adjusted can be measured at the measuring points found below
the knob (markings S and -) or on the terminal block below a black protective
casing (markings S and –, see Figure 6) with a multimeter direct-current
voltage measurement. The adjustment range is ~2...11.2 V.
• Control voltage (air flow) rises when the potentiometer is turned clockwise.
Preset voltages are as follows: 2.5 V, 5 V, 7.5 V and 10 V.
Note! Do not set control voltage so low that the fan does not start (circa 1.5 V).
Sample adjustment of air flows:
Basic ventilation is adjusted at speed 2.
• Set the controller at speed 2 and measure air flows at the valves.
• If the total air flow is too low, set the control voltage higher
at potentiometer 2.
• If the total air flow is too high, set the control voltage lower
at potentiometer 2. Do not throttle the air flow unnecessarily with valves!
• The balance between supply and extract air flows in the Vallox MC ventilation
unit can be adjusted with the potentiometer inside the unit. Do not change
this balance during measurements carried out at other speeds.
• Adjust the away air flows correspondingly at speed 1 (potentiometer 1).
• Adjust the boost air flows correspondingly at speed 3 (potentiometer 3).
• You can usually leave speed 4 at full power.
Finally measure voltage at all speeds at the measurement pins and enter them in
the measurement record. In a terraced house, for instance, you can use voltage
measurement to copy the measurement in the first dwelling to other similar
dwellings.
1
2
3
4
6
5
A
Measure voltage at the - and S contacts, adjust
speed 2 at potentiometer 2, and so on.
