02/99
3 - 4
DS 1.002
CONNECTION DIAGRAMS
INSTALLATION
1.
Select location for sensor which is representative of the space to
be controlled and where it will be readily affected by changes in the
general space temperature (See Fig.4). When used as remote
setting unit, select location which is most convenient for room
occupant.
2.
Remove the backplate by pushing in the fixing lugs on the top and
bottom of the sensor with a small screw driver or similar tool.
3.
Thread the wires through the backplate and baffle card and fix it to
the wall or conduit box with the arrow pointing upwards. The baffle
card is used to ensure that there are no draughts from the cable
entries to influence the sensed temperature.
4.
Unscrew the mains wiring cover screw and slide the cover away
from the mains terminals on the backplate.
5.
Connect mains voltage wiring to switch terminals in accordance
with the appropriate scheme diagram (See Fig.2 or Fig.3). This
mains wiring must be suitably sized for the load and comply with
local regulations. When 1 CZU controls a group of fan coil units,
use interface relays or contactors for fan circuits, as required.
6.
Slide the mains cover over the mains terminals and tighten the
fixing screw.
7.
CZU Controllers Only
i.
Connect sensor wires to non-polarised terminals A & C of
sensor, when used as temperature sensor (See Fig.3).
Connect to terminals A & B when used as remote setting unit.
(See Fig.3).
IAC Controllers Only
i.
When connecting terminals A and C (A is the common) to an
IAC control module sensor input set the control module set
value to 10
°
C. This allows temperature sensing and remote
setting from the DRT.
.
ii.
When connecting terminals A and B (A is the common) to an
IAC control module RPW input a 300 Ohm resistor should be
added between DRT terminal B and the IAC control module
RPW input. A Look Up Table module must also be inserted
between the control module RPW input and the DRT
connection. The Look Up Table module must be set up as
follows:-
Sensor wiring precautions:-
Refer to DS 2.201, 2.801 or 2.951 for wiring precautions.
8.
Refit the sensor housing to the backplate.
DRT SWITCH WIRING
DRT SENSOR CONNECTIONS
ON
OFF
SUPPLY
Fan Off Indication
Fig.1
HIGH
MEDIUM
LOW
SUPPLY
OFF
Fan Off Indication
Fig.2
+ Room Temperature
Common
Remote Set Value
Remote Set Value
Fig.3
IN
OUT
1
45
35
2
53
30
3
62
25
4
74
20
5
94
15
6
145
10
7
- - -
- - -
Fig.4
