HRW 007 to 012 - WESPER - #5

Variable sequential start-up function : when the system is first energised, or after a power cut, or after opening and closing the "CLK" contact, a random time delay of 0 to 30 seconds is introduced by the electronic board to prevent the water source heat pumps from all starting up simultaneously, thus avoiding a power surge.

Emergency shut-down / stand-by / night setback : the

electronic board has two "CLK" terminals which shut the unit down immediately.

By incorporating an area thermostat in series, the "CLK" contact can also be used as a night setback and the water source heat pump will start up again as soon as the ambient temperature drops below the set point of the setback thermostat.

Anti-freeze safety function : this is provided by two temperature sensors. In cooling mode an "ICT" temperature sensor located in the finned coil protects the water source heat pump against accidental freezing.

In heating mode, the safety function is provided by an "LWT" minimum water outlet temperature sensor. The anti-freeze fault read by the temperature sensor is displayed by a coded signal on the LED of the RCL remote control.

The automatic reset LP pressure switch completes the anti-freeze safety function by monitoring a minimum acceptable suction pressure to ensure correct operation of the compressor. This LP fault is also displayed by a coded signal on the LED of the RCL remote control.

High temperature safety function : the "ICT & LWT" temperature sensors check that the condensation temperature at the finned coil and the water temperature at the outlet of the water/refrigerant heat exchanger do not exceed the authorised limits.

The manual reset HP pressure switch completes the high temperature safety function. The high temperature safety fault read by the ICT and LWT sensors and the HP pressure switch cut-off is displayed by a coded signal on the LED of the RCL remote control.

Condensate drain pan fluid level safety function : the STORM

electronic board permanently monitors the water level in the condensate drain pan, by means of a float type contact switch.

If the water reaches an abnormally high level, the machine is switched to safety mode and the fault is displayed by a coded signal on the LED of the RCL remote control.

Fault reports : the electronic regulation carried out by the STORM

board uses coded signals to remotely report eight different possible machine faults on the display LED of the RCL remote control :

- HP pressure switch tripped,

- LP pressure switch tripped,

- fan motor ipsothermal fault,

- heating mode anti-freeze fault,

- minimum water temperature limit in heating or cooling mode,

- maximum water temperature limit in heating or cooling mode,

- cooling mode anti-freeze fault,

- condensate drain pan high level safety fault.

The STORM electronic board also enables the general machine fault to be sent to a remote fault relay via a dry contact (optional).

Phase monitor : The water source heat pumps (three-phased models) are factory equipped with a phase monitor to detect the presence and order of the phases.

Motorized valve : The STORM electronic board has a 230 volt output for an (optional) motorized valve controlled by the operation of the compressor, in order to enable the flow-rate of the hydraulic pump(s) to be regulated according to the manometric pressure in the water source.

System without water source heater : The STORM electronic board can be configured to stop the water source heat pump if the water temperature in the system becomes too low, and to automatically start an electric air flow heater which is monitored by the room temperature regulation sensor (RCL) or the air intake temperature sensor (RAT).

Electric heater : HRW water source heat pumps can be factory equipped with an optional in-duct air heater located at the fan outlet.

The electric heater function can, depending on the configuration of the STORM electronic board, be used in place of the thermodynamic heating as soon as the temperature in the water system drops below a minimum limit (SH system), or it can be used as an electric heating system on its own (RH system).

The HRW 07, 09, 12, 19 and 24 units, which operate on a single-phase 230 volt mains supply, are factory equipped with two electric heater stages. The other models, which operate on a three-phase 400 volt mains supply, have a single-stage electric heater.

This centralised control unit is proposed as an option, and can be installed in place of the local RCL remote control or connected to the STORM electronic board as a supervision station to monitor and manage 32 water source heat pumps in 15 zones from a single point, in addition to the local RCL remote controls.

The yuBMS mini-supervision station enables the zones to be programmed with global control for all zones, or with individual control of each zone with programming of the operating time ranges over a 7 day period, with management of the heating, cooling and night setback modes.

It also provides the possibility of having different set-points in different zones.