■
To ensure sufficient heating capacity for covering ventilation heat requirements,
the maximum air flow rate of the RoofVent
®
units is automatically reduced
when the outside temperature falls below – 26 °C. It is continuously lowered to
9250 m³/h at an outside temperature of – 40 °C.
Attention
The maximum air flow rate is reduced at outside temperatures of – 26 °C
and lower.
9 Maintenance and repair
Caution
Risk of injury from incorrect work. Maintenance work must be carried out
by trained personnel.
9.1 Safety
Before performing any work on the unit:
■
Switch off heating operation (operating mode 'L_OFF').
■
Close the cut-off valve in the gas supply line.
■
Let the unit cool off. The heating pump continues to run to cool down the heat
exchanger.
Attention
Fire hazard due to hot components. Do not switch off the power supply
until the heating pump comes to a complete stop!
■
When the heating pump comes to a stop: Turn the isolation switch on the unit to
the 'Off' position and secure it against being switched back on.
Caution
Danger of electric shocks. The unit controller and the service socket are
still live.
■
Wait at least 3 minutes after switching the unit off.
Caution
The use of condensers can pose a danger of fatal injury from directly
touching live parts even after the unit is switched off. Only open the
access doors after waiting 3 minutes.
■
Observe the accident prevention regulations.
■
Observe the particular dangers involved when working on electrical systems.
■
When working in the unit, take precautions against unprotected, sharp metal
edges.
■
Immediately replace damaged or removed informational and warning signs.
■
Following maintenance work, professionally reassemble all dismantled protec
-
tive devices.
■
Replacement parts must comply with the technical requirements of the unit
manufacturer. Hoval recommends the use of original spare parts.
Fig. 33:
Position of the isolation switch behind the
supply air access door
35
RoofVent
®
KG
Operating instructions
Maintenance and repair
4 220 755-en-00