SYSHRW Engineering Data Manual (EDM HRW S 4GB)
STORM 2 electronic board
RCX user remote control
SYSHRW
3
Control Features
STORM 2 electronic board
All SYSHRW water source heat pumps are, in their standard version,
equipped with a STORM 2 electronic board which manages their
operation and their safety devices.
The conguration of the STORM 2 electronic board enables four
different operating modes for water source heat pumps by selecting
the following systems :
Thermodynamic cooling and heating operation;
Thermodynamic cooling and heating operation or heating
operation with an additional electric heater;
Thermodynamic cooling operation and electrical heating
operation;
Thermodynamic cooling operation only.
RCX user remote control
An RCX user remote control is supplied as standard on SYSHRW sizes
019 to 120 in the electrical control box of the units.
It enables individually controlled operation or stand-alone regulation.
The RCX remote control is ergonomically designed and discreet. It
comprises a digital display and essential functions such as :
On/Off,
Selection of operating mode,
Room temperature display,
Fan speed selection,
Temperature set-point adjustment.
Master/slaves control : the standard version of the STORM 2 electronic
board enables operation in master/slaves regulation mode for up to 6
water source heat pumps using a single RCX user remote control.
This conguration enables the installer to save on the purchase and
wiring of equipment such as auxiliary relays and multi-wire cables
between the various water source heat pumps. Only a bus cable with
2 twisted pairs is necessary between the master and slave units.
When a request for operation in cooling mode is received, the fan-
motor assembly is started up immediately and the compressor does
not start until after an effective time delay of 180 seconds. The RCX
remote control enables operation in cooling-only mode or in automatic
cooling/heating mode with, at a given temperature set-point used as a
switch-over point, a neutral switch-over range of +/-3 °C from cooling
to heating mode. In cooling mode, the fan runs permanently and the 3
speed ventilation can be implemented in automatic or manual mode :
HS, MS, or LS (when applied).
When a request for operation in heating mode is received, the
fan-motor startup is controlled by the electronic board and the
temperature of the ICT sensor; the reversal valve is activated before
the compressor and the latter does not start until after an effective
time delay of 180 seconds. The RCX remote control enables operation
in heating-only mode or in automatic heating/cooling mode with, at
a given temperature set-point used as a switch-over point, a neutral
switch-over range of +/-3 °C from heating to cooling mode. In heating
mode, the fan can operate either cyclically (the fan stops when the set
temperature is reached) or permanently and the 3 speed ventilation
can be implemented in automatic or manual mode : HS, MS, or LS
(when applied).
Measurement of the room air temperature : the STORM 2 card
electronic regulation enables the selection of a room temperature
measurement mode which uses an ambient temperature sensor
(RCT) in the RCX remote control, or a return temperature sensor (RAT)
located directly on the water source heat pump.
Anti-short cycle : after each compressor shut-down, a time delay of
180 seconds is introduced by the electronic board. This time delay
constitutes an anti-short cycle device and therefore helps to protect
the compressor.