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should be calculated according to the current at full load together with the on-site conditions and
the cable length between the relay, the immersion heater and the consumer unit.
A DHW storage cylinder immersion may be called to switch on to provide thermal disinfection of
the DHW cylinder. This may be the case if a DHW storage temperature of 60°C cannot be
achieved by the heat pump alone. To enable this functionality, parameter R35 should be changed
to ‘2’ (Water Tank) and parameter H18 set to ‘Stage1’ . Thermal disinfection times can then be
set in the engineer’s menu using parameters G01 to G05. The control settings of the immersion
should be set during commissioning.
An in-line immersion heater may be called to switch on to aid with defrosting and to provide a
boost when the ambient temperature is low. If an in-line immersion is to be used, parameter R35
should be set to 1 (Water Line). This immersion will then become active when all of the following
conditions are met:
The Ambient Temperature is less than 4°C.
The Inlet Water Temperature is 7°C less than the Target Temperature.
The compressor has been at maximum output (> 80Hz) for more than 30 minutes.
The water pump has been running for at least 1 minute and flow is detected.
This immersion will then switch off when any of the following conditions are met:
The Ambient Temperature rises to more than 2°C.
The Inlet Water Temperature rises to 2°C less than the Target Temperature.
The compressor outputs drops below the medium output (< 50Hz).
Flow is no longer detected.
If neither an in–line immersion nor a DHW cylinder immersion are to be used, parameter R35
should be set to 0 (Not Used).
RO 12 Alarm
– This output (230Vac) is not available in the installers wiring enclosure and so
must be connected directly into the main control board. It can be used to trigger a light or buzzer
to indicate that there is an error/alarm situation. This is useful if the controller is not in an occupied
space or to alert a Building Management System (BMS).
3.10.5 User Interface (Controller)
The user interface (controller) needs to be connected by plugging it into the corresponding plug
which can be found in the installer’s wiring terminal. The interface can be plugged directly into
the unit or further away in the property by using the supplied extension cable. This extension
cable is 10m long and this can be further extended up to a maximum length of 200m. The
extension cable can be extended by joining with a 5-core cable with wire gauge of 0.5mm
2
. The
cable should be joined in such a way so that the connectors are located at each end for joining to
the unit or the interface as appropriate.
3.10.6 DTU Module
The Data Transfer Unit (DTU) is a communication module which when connected to the air source
heat pump, provides remote control and diagnostics through a Cloud server. The DTU module
connects to the cloud server via the 4G Telephone Network. The module consist of a control box
with display LEDs, an antenna and wiring to connect it to the air source heat pump’s control board.
The DTU module wiring is connected to the 485_A3, 485_B3 and GND terminals on the main
control board. This is shown more clearly on the wiring diagram located inside the electrical
control panel.
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