Filling And Topping Up The Storage Tank - Rotex HPSU compact (V5) Installation And Maintenance Manual

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.
11. Check the system water pressure on the RoCon HP controller
of the ROTEX HPSU compact.
Top up the water in the heating system if necessary, until
the pressure display is within the permitted range
(see section 7.4).
12. Check and clean filter/sludge separator.
13. Check minimum flow rate (see section 5.1.5).
14. Clean plastic surface of ROTEX HPSU compact with a soft
cloth and mild cleaning agent. Do not use any cleaners with
aggressive solvents (damage to the plastic surface may
occur).
15. Refit the cover (see section 4.3).
16. Servicing of the external unit and other heating components
connected to the ROTEX HPSU compact should be carried
out as specified in the respective associated installation and
operating manuals.
17. Complete the confirmation of servicing in the supplied
operating manual of the ROTEX HPSU compact.
FA ROTEX HPSU compact (V5) •
7 x Service and maintenance

7.3 Filling and topping up the storage tank

CAUTION!
Filling the storage tank container with ex-
cessive water pressure or with too high a
flow speed can cause damage to the
ROTEX HPSU compact.
Only fill with a water pressure <6 bar
and a flow speed <15 l/min.
CAUTION!
If filling or topping up the storage tank is
done by means of the boiler filling and
UK only!
drain valve, a temporary filling loop must
be used with the appropriate backflow
prevention device in accordance with
clause G24.2, Guidance to the Water
Supply (Water Fittings) Regulations
1999.
If the storage temperature falls below a certain
minimum value, the safety settings of the ROTEX
HPSU compact prevent the operation of the heat pump
in the case of low external temperatures:
– External temperature < -2 °C, minimum storage
temperature = 30 °C
– External temperature < 12 °C, minimum storage
temperature = 23 °C.
Without backup-heater:
The storage tank water must be heated to the minimum
required storage temperature by an external heater.
With Backup Heater (BUxx):
With an outdoor temperature < 12 °C and a storage
tank temperature < 35 °C, the Backup Heater (BUxx) is
switched on automatically on in order to heat up the
storage tank water to at least 35 °C.
In order to accelerate the heating process with
the back-up heater, temporarily
– Parameter [Function Heating] = "1" and
– Set parameter [Power DHW] to the maximum
value of the back-up heater.
– Switch the rotary switch to operating mode
and set the parameter [1x Hot Water] to "On".
Following successful heating, reset the parame-
ters to "Off".
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