Rotex HPSU compact 304 Installation And Maintenance Manual page 42

7 x Service and maintenance
WARNING!
The gaseous coolant is heavier than air. In pits or in
badly ventilated rooms it can collect in high concen-
trations. Breathing in high concentrations of gase-
ous coolant leads to feelings of faintness and suf-
focation. Toxic gases can be formed if gaseous
coolants come into contact with open fire or hot
objects.
When working on the refrigerant circuit, ensure
that the workplace is well ventilated.
If necessary, before starting work, evacuate the
coolant system completely.
Never carry out work on the refrigerant circuit in
closed rooms or work pits.
Do not let coolant come into contact with open fire,
embers or hot objects.
Never allow coolant to escape into the atmosphere
(forms high concentrations).
After removing the service pipes from the filling
connections, carry out a leakproof test on the
refrigeration system. coolant can escape through
leaks.
WARNING!
At normal atmospheric pressure and ambient temper-
atures, liquid coolant vaporises so suddenly that on
contact with skin or eyes it can cause the tissue to
freeze (danger of going blind).
Always wear safety goggles and protective gloves.
Never allow refrigerant to escape into the atmos-
phere (high pressure at the point of the leak).
When removing the service pipes from the filling
connections, never hold the connections in the
direction of your body. Residual refrigerant could
escape.
WARNING!
Under the cover of the ROTEX HPSU compact tem-
peratures of up to 90 °C can arise during operation.
During operation, hot water temperatures >60 °C
arise.
– Touching components during or after operation
leads to a risk of burns.
– Water discharged during maintenance and servic-
ing work can cause scalding on contact with the
skin.
Before carrying out servicing and maintenance
work, allow the ROTEX HPSU compact to cool
down sufficiently.
Wear protective gloves.
42
WARNING!
Live parts can cause an electric shock on contact
and cause fatal burns and injuries.
Before beginning work on live parts, disconnect
all of the systems circuits from the power supply
(switch off main switch, disconnect fuse) and
secure against unintentional restart.
Electrical connection and work on electrical
components must only be carried out by qualified
electricians in compliance with valid standards
and guidelines as well as the specifications of the
energy supply company.
Covers off equipment and servicing flaps are to
be replaced as soon as the work is completed.
1. Dismount the protective cover (see section 7.2).
2. Carry out a functional inspection of the ROTEX HPSU
compact, as well as all installed accessory components
(backup heater, solar installation) by checking the
temperature display and the switching states in the individual
modes.
3. If a ROTEX solar system of the DrainBack
connected and in operation, switch this off and empty the
solar panels.
4. When operating the ROTEX HPSU compact in a bivalent-
alternative system; switch off all heat generators and
deactivate the bivalent control unit.
5. Visual check of general condition of the ROTEX HPSU
compact.
6. Visual check of the water storage tank level (filling level
indicator)
Top up the water if necessary (see section 7.4), deter-
mine the reason for the low water level and remedy it.
The ROTEX HPSU compact is designed to be low-
maintenance. No corrosion protection equipment is re-
quired (such as expendable anodes). This means there
is no need for maintenance work such as changing the
protective anodes or cleaning the inside of the storage
tank.
7. Check the connection of the safety overflow and drain hose
for leaks, free drainage and gradient.
If necessary, clean the safety overflow and drain hose and
relay it; replace damaged parts.
8. Visual check of connections, lines and safety pressure relief
valve. In the event of damage, determine the cause.
Replace defective parts.
9. Check all electrical components, connections, and cables.
Repair damaged parts or replace them.
If the connecting cable for the optional Backup
Heater shows damage, the complete Backup
Heater must be replaced.
The connecting cable cannot be replaced sepa-
rately.
10. Check the water pressure of the cold water supply (<6 bar)
and if necessary the fitting or adjustment of the pressure
reducer.
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