the red push button, which is accessible has to be investigated and remedial action
is to be taken
–
Frost Protection of the Heat Exchanger Unit
A thermal humidistat avoids ice build up on the heat exchanger unit of the KWLC.
This sensor controls the intake air fan so that ice cannot build up. Warm air e.g.
from the bathroom contains high humidity and therefore it is very likely that con-
densation occurs. Therefore the temperature in the heat exchanger must not drop
too low that water freezes in it. The thermal hunidistat controls the hunidity of the
air. In addition he measures the temperature of the heat exchanger unit. In case of
frost danger and high humidity in the heat exchanger the speed of the intake air
fan is reduced and the bypass flap opens simultaneously to the protection of the
heat exchanger unit. The lower speed of the intake air fan as well as the open by-
pass flap remain unchanged until the heat exchander has warmed itself sufficient-
ly. In case of frost danger und dry air in the heat exchanger the KWLC keeps its
adjusted operating state ( no reduced output)
–
Summer Service
(pic. 3)
During the warmer months (apart from the heating period) it is not necessary to re-
cover heat. If the temperature at the summer thermostat at the outside air spigot
increases above the adjusted temperature (e.g. 17°C) the bypass flap will open
and let the air flow through.
Attention:
The thermostat of the additional heating (1) and a possible separate
room thermostat have to be set to "0" to avoid unnecessary waste of energy.
MAINTENANCE
All servicing when electrically isolated.
- Opening of doors
(pic. 3)
Open all claims (14). Then remove the door completely (12/13). Set the door back
in reverse order.
Attention:
The unit has a door on both sides so that entry can be made through
the side required.
- Filter
The unit comes with several filters:
•
Outside air/Extract air:
fine filter F5 Ref.no. 0179
The outside and the extract pre filter are to be changed or cleaned at least every
three months. The fine filter should be replaced at least after 1 year of use for hy-
gienic reasons. When replacing the filter the correct air flow direction through the
filter has to be observed. When the outside air is very dirty an air filter box (LFBR
315) should be fitted in the ductwork and the filter should be cleaned or replaced
frequently.
- Filter control
(pic. 3)
To control the filter automatically, two differential pressure switches are connected
to the KWLC. Is the filter dirty, the control lamp of the filter at the operator device
will light up.
- Fans
The fans are to be maintained and cleaned every 12 months at least. For cleaning
use a small brush and an oil free cleaning fluid. Make sure that no water gets into
the motor. Fan must be completely dry before re-mounting.
To dismantle the fan,
unplug the electrical plug-socket facility (pic.3)
- Heat recovery battery
To be cleaned at least twice a year. Pull out the unit carefully. For cleaning put in
warm soapy water (do not use cleaning fluid containing Natriumcarbonate) and fi-
nally clean with warm water. When re-assembling ensure correct installation.
- Valves:
To be cleaned at least annually.
- Outer grilles:
Check yearly that grilles are free from leaves etc.
SOURES OF MALFUNCTIONING
(pic. 3)
–
No air flow
•
Check electrical connection / fuses
•
The overheating thermostat (2) may have tripped. Remove white plastic cap
and press red button.
•
The unit can be dirty
•
Filters (5) could be dirty. Change or clean them (see maintenance)
Operation and installation instructions no. 90728
Central ventilation with heat recovery unit KWL-Center 1200
–
Inlet air is cold
•
Set heater thermostat (1) to a higher temperature
•
Ductwork in cold areas need extra isolation
•
Make sure that summer-insert was changed against the heater recovery battery.
•
Check if overheating thermostat of the heater has tripped. Press red reset but-
ton (2).
If any of the mentioned points do not help please contact HELIOS. Please state
serial number given on the rating plate which is near the thermostat of the heating
coil.
Do not try to repair the unit yourself.
ACCESSORIES
The use of accessories not offered or recommended by HELIOS will make the gu-
arantee invalid. The use of an electronic speed or transformer speed controller is
not permitted.
WARRANTY
If the preceding instructions are not observed all warranty claims and accommodati-
on treatment are excluded. The Helios warranty is limited to the material and work-
manship of the product.
CERTIFICATES
When installed correctly and used for its intended purpose, the
product complies with applicable European standards and regulations at date of ma-
nufacture.
Ein
Aus
Filter
3-step
switch (S1)
control lamp
of fan
control lamp of
el
ectric heater bat-
tery
control lamp of
filter control
on-/off-switch of
el
ectric heater
battery
(S2)
pic. 1
operator device
