Remak VCS Installation And Operating Instructions Manual page 100

POOL UNITS – description of control
n Circulating damper
Enabled in economy mode heating or dehumidification stage
1. If the circulation damper is open, the inlet and outlet valves
are closed. The outdoor unit is not circulating and 100%
circulates it. The mixing valve is further regulated according
to temperature and humidity.
Heat Pump
n
Activated and continuously controlled on request from
temperature control. However, during circulation, it is not
controlled by temperature but is activated based on the
requirement of humidity control.
Restriction of operation: Heat pump operation is blocked if
one of these situations occurs:
1. outdoor temperature is out of set limits
2. the pressure differential on the heat exchanger
is out of range ∆P
min
To set all parameters, see list of data points.
n Plate Heat Exchanger
Power regulation is ensured by continuous bypass control.
Pro-Vapor Pool Unit (Units without Integrated Heat Pump).
Anti-freeze protection – standard (for the plate heat
exchanger without integrated mixing):
Intervention and bypass control according to the standard
regulation of the standard HVAC based on the measured
exhaust air temperature after the recuperator - part of the
manual for frost protection of the heat exchange.
Anti-freeze protection – option (for a plate heat exchanger
with integrated mixing)
Additionally, over the standard, following is supplemented:
n when activating this bypass, the inlet/outlet dampers are
preferably fully opened + the mixing valve is closed
n Reduced speed of the intake fan to stage 1
Pool unit with integrated heat pump and circulation
damper:
Anti-freeze protection – standard
is ensured by monitoring the state of the differential pressure
transmitter ∆Pmax (min. state 60s), while monitoring the
outdoor temperature below -5 ° C and the state when the
unit is supplying fresh air. If these conditions occur, the unit
will activate the antifreeze protection:
The unit switches to the preset time (default 15 minutes,
if ∆Pmax lasts longer) to the antifreeze mode (Economy
mode, dehumidification of 1st stage - circulation, bypass
closed). When the antifreeze mode is complete, re-activation
is blocked.
Anti-freeze protection – option
It is used in exceptional cases where the standard is very
active and reduces dehumidifying power and fresh air
frequently. Switching between variants is possible with HMI.
The activation is the same as the standard option. The
98
– ∆P
mid
intervention is the same, except for the inlet and outlet
dampers, which are controlled according to the humidity
requirement (Economy mode, dehumidification of the 1st
stage - circulation, bypass closed, mixing valve is closed, supply
/ exhaust flaps regulated).
n Pump for pool water heating
The pump discharges excess heat that is generated during
the dehumidification and operation of the HVAC unit. It is
triggered under the condition of dehumidification requirement
and sufficient supply air temperature. Furthermore, there is a
requirement for dehumidification and the required room air
temperatures and active heat pump operation.
Additional control functions
Further, all other features based on the standard HVAC
application are fully available. These are described in the
relevant paragraphs for a standard application. Like:
n Recovery and mixing at the start of the HVAC
n Start optimization
n Night cooling