Re-Commissioning; Requirements; Start-Up - Rotex HPSU compact (V5) Installation And Maintenance Manual

5.2 Re-commissioning

5.2.1 Requirements

CAUTION!
Setting up in frosty conditions can result
in damage to the entire heating system.
Only commission at temperatures
below 0 °C when a water temperature
of at least 5 °C can be guaranteed in
the heating system and storage tank.
ROTEX recommends that you avoid op-
erating the system in extremely frosty
conditions.
– The ROTEX HPSU compact is fully connected.
– The coolant system is dehumidified and filled with the speci-
fied amount of coolant.
– The heating and hot water systems are filled and charged at
the right pressure (see chapter 7.4).
– The storage tank is filled up to the overflow (see chapter 7.3).

5.2.2 Start-up

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
– Set 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".
1. Check the cold water connection and, where necessary, fill
the potable water heat exchanger.
2. Turn power supply to ROTEX HPSU compact on.
3. Wait for the start phase.
4. After the start phase has completed, in heating mode, vent
the heating system, check the system pressure and adjust if
necessary (max. 3 bar, see chapter 7.4).
5. Carry out a visual inspection for leaks on all joints internally.
Seal any leaks that occur in a professional manner.
6. Set the dial on the controller to the required operating mode.
FA ROTEX HPSU compact (V5) •
7. If a ROTEX solar system is connected, commission this
in accordance with instructions provided. After disconnecting
the ROTEX solar system, check the level in the buffer
storage tank once again.
5 x Start-up
45