Honeywell DHC, Service Manual

Page: 231 / 262

SDC / DHC Hydraulic Components
EN2H-0221GE51 R0812 231
Address CU address Assignment
7 30 CU 3 – Direct heating circuit
8 30 CU 3 – Mixed heating circuit 1
9 30 CU 3 – Mixed heating circuit 2
A 40 CU 4 – Direct heating circuit
B 40 CU 4 – Mixed heating circuit 1
C 40 CU 4 – Mixed heating circuit 2
D 50 CU 5 – Direct heating circuit
E 50 CU 5 – Mixed heating circuit 1
F 50 CU 5 – Mixed heating circuit 2
The integrated room sensor determines the current room
temperature for all the room temperature-related functions and
transfers them to the central device every 20 sec.
The desired control mode is selected with the input button

(press and hold approx. 2 – 3 seconds) and indicated by the
corresponding LED. When the button is pressed, the control
mode is adjusted in the following sequence:
AUTOMATIC MODE – HEATING – LOWERING – AUTOMATIC
MODE - ...
After control mode selection, the selected control mode is
transferred to the central device. Only the control mode of the
heating circuit to which the SDW 10 is assigned is transferred.
The heating circuit is controlled constantly in accordance with the
specification of the automatic program P1 – P3 set in the central
device plus or minus the room setpoint correction at the input
button.
The heating circuit is controlled constantly in accordance with the
desired daytime room temperature plus or minus the room
setpoint correction at the input button.
The heating circuit is controlled constantly in accordance with the
reduced room temperature plus or minus the room setpoint
correction at the input button. The function depends on the setting
in the parameter selection for the heating circuit (reduced
parameter).
Current room
temperature sensing
Control mode
selection
Automatic mode
Heating
Reduction