© VALLOX • We reserve the right to make changes without notice.
VALLOX 70
TROUBLE-SHOOTING
CAUSE
• Air cools in the attic ducts.
• The heat recovery cell has frozen, and discharge air cannot heat outdoor air.
• The post-heating radiator is not functioning.
• The discharge air filter or the cell is clogged.
• The initial adjustments for ventilation have not been made.
DO THIS
• Measure the temperature of supply air in the unit, and compare it with the air coming
from the valve (See page 6, Figure 2.5.3.).
• Check the insulation of the attic ducts.
• Check the functioning of the defrosting thermostat and the preheating resistor (See
the instructions for use, page 6, Section 2.5, "Defrosting"). The defrosting thermostat
may be adjusted by turning the pin clockwise to +10
°
C or anticlockwise to 0
°
C. At
0
°
C freezing is probable, and at +10
°
C there is no freezing, but discharge air going
out may be too warm. At the factory-set value, the defrosting thermostat works at
+5
°
C.
• Check if overheating protection has gone off by pressing the black button at the end
of the radiator. If the protection has gone off, you hear a click when pressing the
button. Pressing the button restores the operation of the radiator after the overheating
protection has gone off.
Ask an expert to find out why this has happened.
• Check the operation of the radiator by comparing it with curve 2.5.3 on page 6. The
curve shows the amount of supply air that is heated by discharge air without any
post-heating.
• Check the cleanliness of the filters and the heat recovery cell.
• Check the initial adjustments.
1. Outdoor air is cool when entering the house.
CAUSE
• The heat recovery cell defrosting is operating and prevents the cell from freezing.
DO THIS
• If you want the fan to stop at temperatures lower than has been defined during the
initial adjustments, you can decrease the thermostat value by 1-2
°
C .
NOTE! If you decrease the threshold by too much, the cell may freeze.
See item 1 on this page.
2. The supply air fan keeps stopping.
/19.05.2005/Premedia Focus/
Vallox Oy FIN-32200 Loimaa Finland Tel: +358 2 7636 300 Fax: +358 2 7631 539
Internet: www.vallox.com
1.09.61E
