5
UT66000455 - 01
È severamente vietata la riproduzione anche parziale di questo manuale / All copying, even partial, of this manual is strictly forbidden
Some rules to follow
Vent air from the exchanger while the pumps are off. For this purpose use the
air vent valves situated next to the exchanger connections.
All ducts, especially the outlet ducts, must be insulated with anti-condensation
material.
An inspection panel must be provided in proximity to the unit to enable
maintenance and cleaning operations.
Install the control panel on the wall; choose an accessible position from where
functions may be easily set and which is suitable for taking temperature
readings, where applicable. Avoid positions directly exposed to sunlight or direct
currents of hot or cold air and make sure there are no obstacles which may
preclude a correct temperature reading.
6
ELECTRICAL CONNECTIONS
Make the electrical connections with the power supply disconnected, in accordance
with current safety regulations.
All the wiring must be done by qualified personnel.
For each thermal ventilating unit provide a mains circuit breaker (IL), with
opening contacts separated by at least 3 mm and an adequate protection fuse
(F).
Electrical intakes are shown on the rating labels on the units. During installation, strictly
abide by the indications on the wiring diagram for the unit-control panel combination
To make the electrical connections, remove the panel covering the electric box (figure
4) to access the terminals.
The electric wires (power and control circuits) must be pulled in through the gland on
the side of the electric box where the plumbing connections are located and then
connected to the terminals.
Wiring diagrams:
-
fig. 8:
PWN
+ recess mounted selector switch
CD
-
fig. 9:
PWN
+ wall mounted selector switch
CDE
-
fig.10:
PWN
+ control panel
TD
-
fig.11:
PWN
+ control panel
TDC
, centralised heating/cooling selection.
-
fig.12:
PWN + TD4T
with 1 valve
-
fig.13:
PWN + TD4T
with 2 valves
The connections indicated must be made by the installer,
Units are equipped with 7 speed motors.
WARNING:
Motor COMMUN wire = WHITE Wrong connection may cause serious damages
to the motor.
Legend referred to figures from 8 to 13:
IL
Circuit breaker (not supplied)
F
Safety fuse (not supplied)
3/7
3 out of 7 speeds
M
Motor
WH
White =commun
BK
Black = maximum speed
BU
Blue
BN
Brown
GY
Grey
GN
green
YE
Yellow
RD
Red = minimum speed GNYE Yellow/green=earth(PE)
SF
Centralised operation selector switch
VK
Water valve (230V ON-OFF)
VKC
Cold water valve (230V ON-OFF) VKH Hot water valve (230V ON-OFF)
KP
Power interface for connecting in parallel 4 PWN units
IPM
Circuit board
EXT
External auxiliary contact
RHC
Remote heating/cooling selector switch (centralised)
7
PERFORMANCE CHECK
Check that the unit is installed in such a way as to guarantee the required inclination.
Check that the drainage outlet is not clogged (by masonry debris etc.). - Check the
tightness of the plumbing connections.
Make sure the electric wires are tightly connected (carry out this check with the power
supply OFF).
Make sure that air has been eliminated from the heat exchanger. Power the unit and
check its performance.
8
MAINTENANCE
The maintenance requirements of
PWN
duct units are limited to periodic cleaning of
the air filter and heat exchanger and checks on the efficiency of condensate drainage.
Maintenance may be performed only by specialised personnel Due caution must be
taken while carrying out maintenance: accidental contact with some metal parts may
cause injury; wear protective gloves.
Whenever starting up the unit after it has not been used for a long time, check that
there is no air in the heat exchanger.
The motor requires no maintenance since it has self-lubricating bearings For
safety reasons, before undertaking any maintenance or cleaning operations
turn off the unit and disconnect it from the power supply using the circuit
breaker.
9
CLEANING THE AIR FILTER
Disconnect the unit from the power supply by setting the main switch on 0 (OFF).
-
Access the unit via the inspection panel and take out the air filter as shown in
FIGURE 14.
-
If the filter is on the inside of the intake grille, remove the latter and then proceed
to carry out the steps described below
Clean the filter with warm water or, in the event of dry dust build-up, using compressed
air. Allow the filter to dry and then fit it back in place.
CLEANING THE HEAT EXCHANGER
It It is advisable to check the condition of the exchanger before the start of every
summer season to make sure that the fins are not obstructed by dirt. To access the
heat exchanger, remove the outlet panel (whether of the type with collars or a
rectangular flange) and the drip tray. On reaching the exchanger, clean it with
compressed air or low-pressure steam taking care not to damage the fins.
Before the start of every summer season, check the efficiency of condensate
drainage.
Adequate periodic maintenance will ensure save
both energy and cost savings.
10
TROUBLESHOOTING
If the unit is not working properly, before calling a service engineer carry out the checks
indicated in the table below. If the problem cannot be solved, contact your dealer or
the nearest service centre.
Problem
The unit fails to work
The unit provides insufficient
cooling or heating
The unit "leaks" water.
Cause
1 No power supply
2 The automatic safety cutout
has tripped
3 The on/off switch is on 0.
1 The air filter is dirty or
clogged
2 An obstacle is obstructing
the air intake or outlet
3 Air is trapped inside the heat
exchanger
4 There are open windows and/
or doors
5 The minijum speed has been
selected
1 The unit has not been
installed with the correct
inclination
2 The drainage outlet is
clogged
Solution
1 Restore the power supply
2 Call a service centre for
assistance
3 Start the unit by moving the
switch to I
1 Clean the air filter
2 Remove the obstacle
3 Call the installer for
assistance
4 Close windows and/or doors
5 Select medium or maximum
speed
1 Call the installer for
assistance
2 Call the installer for
assistance
G B
