Installation/Use/Maintenance Instructions
Fan coil units VFC, installation in sills
E
LTG Incorporated · PO Box 2889 · Spartanburg, S.C. 29304, USA
VFC_USA_BA (07/19)
Phone 864 599-6340, Fax -6344 · e-mail: [email protected] · Internet: www.LTG-INC.net
Former editions are invalid · Subject to technical modifications
page 42 of 19
7.
Operation, Maintenance and Repair
All units are virtually maintenance free, however certain
things should be observed.
Any maintenance and repair work must
be performed by skilled, licensed and
trained staff only.
Before starting any maintenance or
repair work the unit is to be completely
disconnected from the main power
supply!
7.1
Heat exchanger, water connections,
condensate tray
It is recommended to vacuum clean the heat exchanger
and the dry condensate tray on a regular basis.
The heat exchanger blades are sharp-
edged. Wear gloves for protection!
Check water connections and heat exchanger for tight
ness and possible corrosion damages.
If corrosion occurs inside the heat exchangers skilled staff
must check the water treatment.
In case of condensation and existing condensate drainage
the condensate tray will have to be wet cleaned and
checked for contamination on a regular basis as required
by codes, rules and regulations.
7.2
Filter
Unit with filter
If a recirculated air filter exists it requires replacement
about 2…3 months after first use of the unit. By that time,
it will probably be saturated from carpet lints and con
struction dust residues.
Exact timing is subject to local conditions.
The filter must be replaced on a regular basis, every 6
months to 2 years depending on dust formation.
A 6-month filter change interval will be required if the unit
is operated in an environment with heavy dust load, a lot
of foot traffic, and only minimum primary air filter quality.
A 2-year filter change interval might be appropriate if the
unit is operated under conditions without foot traffic, in a
clean environment, and with a very good primary air filter
quality.
Unit without filter
The exchanger(s) is/are to be vacuum cleaned about 2…3
months after initial operation. By that time, heat exchang
ers are usually visibly polluted from carpet lints and con
struction dust remainders. Exact timing is subject to local
conditions.
Heat exchanges will then have to be vacuum cleaned on a
regular basis, every 6 months to max. 2 years depending
on dust formation. This gains particular importance con
sidering that condensate formation might result in hard-
to-remove dust caking.
A 6-month cleaning interval might be required if the unit
is operated in an environment with heavy dust load, a lot
of foot traffic, and only minimum primary air filter quality,
in case of condensate formation on the cooler even
sooner.
A 2-year cleaning interval might be appropriate if the unit
is operated under conditions without foot traffic, in a clean
environment, with a very good primary air filter quality
and without condensate formation on the cooler.
7.3
Fan
The fan is virtually maintenance-free. However, after an
operating time of about 20,000 hours a failure of the fan
may occur. The fan must be checked for smooth and
proper running, possible imbalance, and damages to the
bearing. The fan must also be checked on a regular basis,
every 6…12 months, for potential dust and foreign bodies
on the impeller. Severe pollution and foreign bodies may
result in premature wear of the bearing and fan.
7.4
Repair
If the damage is more that sheet metal damage to the
housing or the outlet grille, units should be completely re
placed and checked by the factory (in case of defects to the
fan it might be sufficient to replace the fan unit without the
need to disconnect the system entirely from the water
supply system).
First, the unit is to be completely disconnected from the
power supply by an expert.
The filter in front of the heat exchanger is easy to replace
since it is fixed to the unit with a simple adhesive strip.
Replacement of the control unit should be
performed by skilled staff only or by the
factory.
Replacement of individual components, e.g.
a fan bearing, is not recommended since
adjustments can only be performed in the
factory using special equipment.
Warranty applies to complete fans only.
