Presto 86710 Notice D'installation page 25

1.1 THERMAL SHOCK:
For information, a thermal disinfection according to the "hot water" decree of 30 November 2005 is ensured by preheating:
60 min at 60°C
or 4 min at 65°C
or 2 min >= 70°C
These values can be adapted according to the installation; they can be defined in the system.
In order that the thermal shocks are as short as possible {particularly if the showers drip during shocks) it is essential that the hot water
temperature can attain at least 70 °C at the last water catchment point for several minutes.
Apart from this capacity, the hot water production must also be able to toggle from one normal t° set point, to a thermal shock
set point controlled by the relay contact of the automatic control system (max 5 A 250 VAC).
The shock can be defined according to a frequency ranging from 0 to 365 days. The starting time as well as whether the showers are
open or not can be defined every week.
It is possible to prohibit shocks on certain days of the week. In this case, or after a failure, the disinfection is postponed to the next
day until it is successful.
It is possible to start rinsing manually at any time by using the system keyboard or by using an auxiliary input.
The definition of a "successful shock" depends on the objectives defined by the administrator in the system configuration.
We can, for example, ask for a simple increase in temperature of the looping without flow, with verification of the time/temperature
constraint opposite.
We can also simply ask for a flow of 5 min without specifying the temperature constraint.
1.2 AUTOMATIC RINSING:
Automatic rinsing enables to programme the opening of all showers or simply bleeding of the network without carrying out a thermal
shock.
If a thermal shock is programmed at the same time or during rinsing, the latter will have priority.
The frequency can be set from 0 to 365 days and for each day of the week we can specify the starting time and authorise or not
authorise a rinsing operation.
The rinsing duration can be adjusted, and it is possible to start it manually at any time by using the system keyboard, or using an
auxiliary input.
1.3 TRACEABILITY:
At rest, the system displays temperatures of probes T°A and T°B placed on the network. We can consult a log of these 2
temperatures over 24 hours.
The number of days that have passed since the last successful shock or the last rinsing fully completed are also displayed. These
two pieces of information are always updated even after long power failures, or even after modifying the system date.
A detailed log records the last 1500 time-tagged events (start of shock, end of shock, intrusion, fault, etc.).
A simplified log lists the last 350 successful or failed shocks or rinsings by date. From this log, we can consult the temperature
change over the last 7 thermal shocks.
The data is saved during power failures by a battery whose average life at 25° is 7 years.
1.4 SAFETY:
Carrying out thermal shocks on showers generates an obvious safety problem.
Apart from common sense measures that consist in programming thermal shocks during closing hours of the premises, the system
may be equipped with presence detectors (8 max.). These must be placed in access corridors to the showers (Caution, they are
sensitive to water vapour!) as they will enable to abandon any thermal shock in case someone is present. They can be divided into 2
detection zones.
Normally closed solenoid valves placed at the outlet of mixing valves A and B enable to guarantee the almost instantaneous locking
of showers following an abandonment. They also guarantee water cut-off in case of power failure during a shock.
So that the water cut-off does not damage the circulation pumps, these are also controlled by the system.
The 3-way valves also have a safety system. If they are not in the proper normal operating position, the showers are locked.
The automatic mechanism also controls the presence of 12 VDC voltage that powers the presence detectors and temperature
probes.
The auxiliary inputs can be configured so as to connect to them an emergency stop push-button to manually interrupt a shock.