Before emptying place the plant
−
master switch at “OFF”:
Check that the loading/plant water
−
reintegration cock is closed
Open the draining cock and all vent
−
valves of the plant and relative
terminals
ATTENTION
If the plant contains glycol, the
latter must not be discharged of
freely as it is a pollutant. It must be
connected and re-used if possible.
Circuit with glycol
Functioning with glycoled water,
−
with a percentage of glycol chosen
based on the minimum outdoor
temperature expected. . In this case
you must take into account the
different outputs and absorptions
and pressure drops as indicated in
the technical booklet.
MAINTENANCE
26.
NOTE
All routine and special maintenance
operations must be carried out
exclusively by qualified staff.
Before starting any servicing
operation or cleaning, be sure to
disconnect the power supply to the
unit.
.
WARNINGS REGARDING
26.1.
MAINTENANCE
i
The inspection, maintenance and
any repairs must only be carried
out by a legally qualified technician.
Lack of controls and maintenance
can cause injury/damage to
persons/objects.
Periodical maintenance is recommend-
ed in order to guarantee the efficiency
of performance and duration of the unit
through time.
Hydraulic circuit
26.1.1.
Check
System
pressure
−
Clean the water filters
−
−
Flow switch/pressure switch interven-
tion
Presence of air in the circuit
−
Plant
∆
T
−
The hydraulic pipe heat insulation
−
status
The quality of the water mixture
−
DHW integrative resistance
−
efficiency, if envisioned
Electrical circuit
26.1.2.
Check
Electric power supply voltage
−
Efficiency of safety devices
−
Electrical
absorption
−
Tightness of electrical connections
−
The status of the electrical
−
connections
Cooling circuit
26.1.3.
Check
Compressor
status
−
The work parameters
−
Check for any R410A gas leaks
−
from the cooling circuit and the in-
tegrity of the piping circuit.
−
Check the intervention of the pres-
sure switches and high and low
pressure transducers, replace
them in the presence of malfunc-
tioning
Check the status of furring on the
−
dehydrator filter; replace the filter
if necessary.
Mechanical controls
26.1.4.
Check the tightness of the screws,
−
the compressors and the electric
box of the external panelling of the
unit. Incorrect fastening can lead to
anomalous noise and vibrations
Check the condition of the
−
structure.
If there are any oxidised parts, treat
−
with paint suitable to eliminate or
reduce oxidation.
i
Keep a maintenance log on the
machine (not supplied with the
unit, the user’s responsibility) that
enables you to keep track of the
servicing carried out on the unit.
This makes it easy to organise
the work appropriately and
facilitates troubleshooting on the
machine.
In the log, record
the date, type of work carried out
(routine maintenance, inspection,
or repair), a description of the
work, any measures taken, and so
on.
EXTRAORDINARY
26.2.
MAINTENANCE
The VXT heat pumps are loaded in the
factory with R410A gas and inspected.
In normal conditions they do not need
intervention of the After-sales Service
relative to refrigerant gas control.
In order to guarantee the efficiency
of the heat pump through time it is
recommended to periodically check
the integrity of the refrigerant load.
Through time, however, small leaks
may be generated at the joints that
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