Auxiliary Connections; Type C Control Module With On/Off Action; Type H Control Module With Modulating Action - Carel heaterSteam User Manual

7.5 Auxiliary connections

Before making the auxiliary connections, disconnect electrical power to the appliance!

7.5.1 Type C control module with ON/OFF action

H
CR
MT
Fig. 7.5.1.1

7.5.2 Type H control module with modulating action

The humidifier with modulating action is fitted with solid-state relays, and thus its capacity can be varied from zero to 100%
depending on the regulation requirements. In this case too, the humidifier can be connected via RS485 to the Carel Humivisor MT
remote control panel or a remote supervisor. It can be controlled in the following three different modes.
a) Slave regulation, with signal from an external regulator.
R
MT
b) Autonomous modulating regulation with ambient relative humidity probe (and possible limiting probe in the supply duct).
HT
MT
Fig. 7.5.2.3
Carel code +030221761
The humidifier is controlled by a mechanical humidistat H or a voltage-free remote contact CR,
or a combination of both.
The control module can be connected to an RS485 serial line, or alternatively to the Carel
Humivisor remote control panel, marked as MT, or to a remote supervisor.
The diagrams in Fig. 7.5.1.2 show the connections to be made on the terminal block I, in the
following cases:
a) action commanded by simple enabling contact;
b) action from external mechanical humidistat;
c) combination of the above.
1I
2I
3I
4I
a 5I
6I
7I
8I
CR
Steam production is managed by an external regulator R which transmits a modulating signal
to the control module; the control module can be programmed to receive alternatively one of
the following modulating signals (see THE HUMIDIFIER CONTROLLER):
voltage signal: 0-1Vdc; 0-10Vdc; 2-10Vdc;
CR
current signal: 0-20mA; 4-20mA.
The reference (zero) of the external regulator must
be connected to terminal 6I on the terminal block I
and the command signal to terminal 5I.
To avoid disturbances in regulation, the ground of
the external regulator must be connected to the
ground of the control.
With this configuration (see Fig. 7.5.2.3) the main
control board, connected to a humidity probe HT,
performs a complete regulation action according to
the humidity measured.
A limiting humidity probe in the supply duct can
CR also be added (see Fig. 7.5.2.4): with this
configuration, typical of air handling systems, the
main control board, connected to a humidity probe
HT, performs a complete regulation action, as well
as limiting the steam production depending on the
value of relative humidity in the supply duct,
measured using the special probe CH.
1I
2I
H
3I
4I
5I
6I
b
7I
8I
Fig. 7.5.1.2
15
H
c
CR
External regulator
OUT
REF
CR
HT
preliminary version - rel. 2.0 - 03/09/99
heaterSteam
1I
2I
3I
4I
5I
6I
7I
8I
1I
2I
3I
4I
5I
6I
7I
8I
CH
C
MT