DS 2.105 2 - 12 10/97
SPECIFICATIONS
OUTPUTS
Control Outputs: 2 x 0 to 10Vdc outputs for heating and cooling.
Output Supply: 2 x 24Vac terminals used to power the actuator(s) up
to a total of 10VA maximum. If more than 10VA is required use an
external 24Vac transformer conforming to EN 60742, see Fig. 9 for
wiring details.
Notes:-
1. All 0 to 10Vdc outputs are protected against accidental short circuit
to 24Vac and ground.
2. Short circuit current of each 0 to 10Vdc output approximately
8.5mA (source resistance is approximately 1500 Ohms).
3. Load resistance for each 0 to 10Vdc output must be equal to or
greater than 10k Ohms.
4. The maximum current that a 0 to 10Vdc output can source is 1mA.
5. New generation sensors should be used on all new installations.
SENSOR INPUTS
"T" type (new Generation) sensors may not be mixed with old
generation sensors on the same CZT.
SWITCHED INPUTS
Night Set Back (NSB): Voltage Free, Make/Break contacts.
Normally Closed.
Set Up: Voltage Free, Make/Break contacts. Normally Closed.
CONSTRUCTION
Memory
The controller stores all non-volatile data in an E2PROM such as the
user set control parameters. This means that in the event of a power
failure the user set parameters willbe maintained without having to rely
on battery support.
INSTALLATION AND COMMISSIONING
The CZT should be installed and commissioned by a competent
technician.
DO NOT SWITCH ON THE POWER SUPPLY UNTIL THE
COMMISSIONING PROCEDURES HAVE BEEN COMPLETED.
Location of Controller
•The controller must be installed in a position which is fairly clean and
free from damp and condensation.
•Temperature and humidity limits must be obeyed
Ambient Operating Temperature: 0°C to 50°C
Operating Humidity: 0 to 95% RH non condensing
•A minimum of 150 mm clearance is required around the controller to
allow access for mounting, wiring, servicing and to avoid electrical
interference from other devices such as contactors.
Wiring Precautions
•On new installations all sensor cables must be screened with the
screens connected separately to the 0V earth point provided. An
MICC earth plate is provided for use if MICC cable is used.
•When upgrading an old CZT installation it is usually possible to use
the existing unscreened sensor wiring as long as the cable run is
less than 100 metresand is sited more than75mm from mains wiring
runs.
•The mains supply, 24Vac output and triac output wiring must be run
separately from all the controller sensor and override inputs.
•The controller must be located as far away as possible (minimum
150mm) from any contactors or switchesand their cables. This is to
avoid any interference to the controller.
•No connections to the controller should be made whilst power is
applied.
Compatible Sensors
There are a large number of Satchwell sensors that are compatible
with the CZT (see Sensor Inputs).
It is not possible to mix old and new generation sensors on the
CZT.
The first time the CZT is powered up it will automatically configure itself
to the sensor type connected (old or new generation).
Changing Sensors
If a CZT connected to old generation sensors is subsequently
equipped with a set of 'type' sensors it is necessary to manually select
the sensor type as 5 (new generation).
Remember that you cannot mix new and old generation sensors on the
CZT.
COMMISSIONING
ENSURE THE MAINS POWER SUPPLY IS OFF AND THAT ANY
OTHER POWER SUPPLIES TO AND FROM THE CZT ARE
ISOLATED.
1. Undo the central case fixing screw and separate the case to gain
access to the terminals.
2. Check that all wiring is correctly connected to the terminals. This
should be done using the connection or application diagram for
reference.
3. Reassemble the controller case and securely tighten the central
fixing screw.
4. Apply mains power to the controller, the display will show reset
followed by the controller firmware number.
5. The controller will then go into review mode.
6. Complete the configuration via the Quick-Set and Fine-Tune
parameters.
7. If an RPW is wired to the CZT, parameters SV1 and SV2 in Quick
Set Mode will be ignored. In this case the heating and cooling set
values are determined by adding and subtracting 1°C to/from the
RPW position, e.g. If the RPW is set to 20°C, the heating set value
will be 19°C and the cooling set value will be 21°C.
Reasonable default values have been selected for the CZT, but it is
essential that the controller is properly tuned to the controlled system.
Typical default values that should be checked/set are:-
The number and type of output stages
Controller tuning
Actuator Ramp Speed
Type: CZT 5305 – One or two stage, 0 to 10Vdc output, proportional controller -
Specification No. 562-5-305
Power Supply: 230Vac, +10%, -6% (50/60Hz)
Power Consumption: 22VA fully loaded
Fuse: 100mA on the 230Vac input
NEW GENERATION SENSORS PREFERRED
Sensor Sensor Type Temperature Range
DRT 3651, 3453, 3451 Room –5 to 40°C
DDT 1701, 1702 Duct –5 to 100°C
DWT 1701, 1702 Water –10 to +120°C
DST 1601 Water (strap on) +5 to +120°C
RPW 4425 Remote Set Value +10 to +35°C
Ambient Temperature
Limits: Operating: 0°C to 50°C
Storage: –10°C to 70°C
Ambient Humidity Limits: Operating: 0 to 95% RH non
condensing
Storage: 0 to 95% RH non condensing
Terminals: The terminals are provided to take wire
of 2.5mm2cross-section.
Conduit Entries: Six, 21mm cut-outs in the top and
bottom of the controller case.
Protection Class: IP 30
Case: Matt black coloured 2 piece
polycarbonate case. Fire resistant to
UL94V-0.
Mounting: Wall or flush panel mounting.
Case Dimensions: 144 x 144 x 136mm
Panel Cut Out Size: 138 x 138mm
