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Honeywell CENTRA LINE MERLIN NX Series Installation & Commissioning Instructions page 22

Room controller
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MERLIN NX ROOM CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS
I/O TERMINALS
CAUTION
Failure to observe the following max. permissible
current outputs of the power output terminals will
result in damage to the device. See also section "All
Models (230 VAC and 24 VAC)" on pg. 12 for details
about powering capacitor-driven fail-safe actuators.
Max. Current Output of Power Output Terminals of
230 VAC Controllers
The 24 VAC power output terminals of the 230 VAC RLxN
controllers are terminals 5, 6, 28, 29, 35, 39, 43, and 44 plus
pin 4 of the controller's RJ45 interface. Two of these terminals
(typically: 5 and 6) will be used to supply the triacs.
The 24 VAC power output terminals of the 230 VAC RSxN
controllers are terminals 3, 4, 22, 25, 27, and 31 plus pin 4 of
the controller's RJ45 interface. Two of these terminals
(typically: 3 and 4) will be used to supply the triacs.
Regardless of whether the triacs are supplied by the con-
troller's internal transformer or by an external source, the
max. permissible combined current output of the afore-
mentioned 24 VAC power output terminals is 300 mA (or 320
mA for max. 2 minutes).
Consequently, if only those two 24 VAC power output ter-
minals used to supply the triacs already have the max. per-
missible combined current output of 300 mA (or 320 mA for
max. 2 minutes), then the current output of the remaining 24
VAC power output terminals must, of course, equal zero.
Max. Current Output of Power Output Terminals of
24 VAC Controllers
The 24 VAC power output terminals of the 24 VAC RLxN con-
trollers are terminals 5, 35, 39, 43, and 44 plus pin 4 of the
controller's RJ45 interface.
The 24 VAC power output terminals of the 24 VAC RSxN
controllers are terminals 3, 22, 27, and 31 plus pin 4 of the
controller's RJ45 interface.
The max. permissible combined current output of these 24
VAC power output terminals is 300 mA.
Relay Outputs
CAUTION
Mixing of line voltage and low voltage within the relay
block is not allowed.
The terminal blocks containing the controller's relay outputs
are orange. Relay output types: See Table 3.
NOTE: If inductive components are to be connected to the
relays and if these relays switch more often than
once every two minutes, these components must be
prevented from causing harmful interference to radio
or television reception (conformance with
EN 45014).
EN1Z-1035GE51 R0420
Triac Outputs
NOTE: Recommended fuse (F1): 1.25 A time-lag fuse (IEC).
User must consider the correct voltage and max.
breaking capacity / interrupting rate (line voltage
urgently requires high breaking capacity /
interrupting rate).
The terminal blocks containing the controller's triac outputs
are orange.
These triac outputs can be used for a variety of different
functions, e.g., for connection to either a floating drive or to a
thermal actuator. Once the triac outputs have been
programmed, the corresponding devices can then be con-
nected to them directly.
NOTE: The VC6983 actuator is intended for use at relay
outputs, only and must not be used at the controller's
triac outputs.
Triac Current Limitations
The max. allowed current with which the ensemble of a con-
troller's triacs may be loaded is dependent upon whether the
given model is powered with 24 VAC or with 230 VAC (and, in
the case of models powered with 230 VAC, upon whether the
outputs are supplied by the controller's internal transformer or
by an external current supply). Specifically:
In the case of 24 VAC models, the ensemble of a con-
troller's triacs may be loaded with 600 mA.
In the case of the 230 VAC models, if the triacs are
supplied with 24 VAC current by the controller's internal
transformer, the ensemble of a controller's triacs may be
loaded with 300 mA (or 320 mA for a max. of 2 minutes);
when supplied by an external source, this value is
doubled.
However, regardless of whether the triacs are supplied
internally or externally, a single triac must never be loaded
with a current of more than 300 mA (320 mA for max. 2
minutes).
Nevertheless, the ensemble of triacs can be loaded for very
short periods of time (on the order of milliseconds) with a
current on the order of 2500 mA typically encountered when
switching on multiple thermal actuators.
Universal Inputs
The terminal blocks containing the controller's universal
inputs are blue. Universal input types: See Table 4.
The universal inputs are protected against voltages of max.
29 VAC and 30 VDC (due to, e.g., miswiring).
22

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