Options & Accessories

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Cascading operation
6720811759 (2019/07)
2.4 Primary/Secondary identification
The primary appliance is identified by the following symbol;
Fig. 15 Primary symbol in RTG 199HE/ME, RTG-K-199/166
cascading mode
2.5 Cascading operation
2.5.1 Secondary activation/deactivation
RTG 199HE, RTG 199ME models
The primary appliance serves as the controlling primary
appliance and the remaining appliances (secondary) are
inactive by default. If the hot water demand in the primary
appliance reaches 85% (or above) of its capacity, a signal is
sent to the first secondary appliance to ignite. If the same
happens with the secondary appliance, then the next
secondary in the cascading ring is activated, an so on.
When the hot water demand in any appliance reaches 30% (or
below) of its capacity, it will send a signal to the next appliance
in the cascading ring to deactivate.
RTG-K-199N/X1, RTG-K-160N/X1, RTG-K-199N/X2 and
RTG-K-160N/X2 models
The primary appliance serves as the controlling primary
appliance and the remaining appliances (secondary) are
inactive by default. If the hot water demand in the primary
appliance reaches 80% (or above) of its capacity, a signal is
sent to the first secondary appliance to ignite. If the same
happens with the secondary appliance, then the next
secondary in the cascading ring is activated, an so on. An active
secondary will then act as a primary to the next secondary.
When the hot water demand in any appliance reaches 20% (or
below) of its capacity, it will send a signal to the next appliance
in the cascading ring to deactivate.
2.5.2 Primary rotation
Primary rotation will happen when water flow is OFF and 100
burning hours are reached on the primary appliance. The
primary appliance will transfer the primary attribute to the next
appliance in the cascading ring.
2.5.3 Error handling
When one appliance in the cascading system is locked, due to
an error code, all actions are sent to the next appliance. If the
appliance is a Primary, it will request to the next appliance to be
the primary.
If an appliance in cascading is powered off or its electronics are
damaged or disconnected, or the cables are not properly
connected, it will not send the necessary messages for correct
cascading operation. If the damaged appliance is the primary,
cascading will not work.
A damaged appliance must be turned OFF and the cascading
cables must be disconnected from it. Bypass the damaged
appliance by turning it OFF and disconnecting it from the
cascading ring. Connect both ends of the cascading kit of the
damaged appliance to ensure communication continuity on the
cascading ring.
Additionally, if the damaged appliance is the Primary, another
appliance has to be defined as Primary, see section 2.3.
2.5.4 Temperature set point change
If the set point temperature is changed in one appliance, then
the set point will be updated in all appliances in the cascading
system. Appliance specific set point range limitations continue
to apply in cascading mode. To avoid set point temperature
discrepancies across appliances in the cascading loop, ensure
all appliances have the same set point range settings.
2.5.5 Remote control usage
Only one remote control is needed to change temperature
setpoint in the system. It can be installed in any appliance,
independently of being a primary or a secondary. However, the
error codes present in any appliance in the system (except the
one connected to the remote control) will not be visible in the
remote.
2.5.6 Recirculation system
Appliance controlled recirculation cannot be activated
simultaneously with cascading. If cascading mode is activated
and you activate recirculation, the cascading mode will turn off
and vice-versa.