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VR 250 ECH/B
Operation and maintenance instructions
206610 (16-11-2010)
5
Systemair
AB
GB
Supply air temperature
Buttons to increase or decrease inlet air temperature in 5 steps
(fig.2)
. Supply air temperature is
increased/de-creased by pressing buttons (9) and (10) alternatively. Lamp signals (6), (7) and (8) show
set supply air temperature.
Step 1 Lamp (6) lights (factory setting).
Step 2 Lamp (6) and (7) light.
Step 3 Lamp (7) lights
Step 4 Lamp (7) and (8) light
Step 5 Lamp (8) lights
When heat recovery from the extract air is in-sufficient to obtain set supply air temperature, an electrical
heater battery will automatically be switched on. Lamp signal (14) will light up when the heater battery is in
operation. (In general it is recommended to set supply air temperature as low as possible, avoiding the
feeling of draught. This gives the ultimate energy and ventilation efficiency).
Filter
Lamp signal (11) comes on when set operation time between changing of air filters (pos. A & E,
fig. 1
) has
expired. The ventilation unit can still be operated, but the efficiency will be reduced if the filter is not
replaced. Operation time (6, 9 or 12 months) between filter changes can be set on the control panel (see
installation instructions). From factory, operation time is set to 9 months. Reset operation time after having
changed the filter (see “Maintenance”).
Summer operation
When supply air temperature exceeds set temperature, the rotor will stop and there will be no heat
recovery (summer operation). If the extract air temperature becomes lower than the outdoor temperature
(for example: if the building has cooling/air conditioning installed), the unit will automatically switch to
recovery (of the chilled indoor air). The extract air will then cool down the inlet air in the exchanger. Lamp
12,
(fig. 2)
lights when the rotor is not in operation.
Manual summer operation
Even if the outdoor air temperature is low, the room temperature could be higher than wanted, due to
sunshine (spring and autumn). Lower room temperature can be obtained by setting the supply air
temperature to step 0 (none of the lamps 6, 7 or 8 are illuminated), and at the same time increase the
airflow to MAX.
To avoid that the ventilation unit remain in "manual summer operation" when heat recovery is required,
automatic reset to normal operation will happen when supply air temperature becomes lower than 5°C.
