3
B 217 - RTE 98. Eng.
25.09.07 LB
REV. 01
We reserve the right to make changes without notice
COSTER
10. INSTALLATION
10.
1
Controller
The controller must be installed in a dry location which meets the ambiental limits given under 5. TECHNICAL DATA.
If installed in spaces classified as “Dangerous” it must be installed in a cabinet for electrical appliances constructed
according to the regulations in force for the type of danger concerned.
The controller can be wall-mounted or fitted into a composite control panel door.
10.
2
Plant fl ow temperature detector B1
With plant pump on flow it must be installed downstream of this; with pump on return
it must be installed at least 1.5 metres downstream of the control valve.
10.
3
Outside temperature detector B2
This must be installed outside the building on the north or north-west side, at a height from the ground of at least
three meters.
It must be protected from direct sunlight and sited as far as possible from windows, doors, chimneys, etc which
can create direct thermal disturbances.
11. ELECTRICAL CONNECTIONS
Proceed as follows:
• SSeparate the case from the electronic module using the handles provided
• Mount the case on the panel door or on the composite control panel back plate and secure it
• Make the electrical connections according to the wiring diagram and in respect of the safety regulations in force,
using the following cable types:
– 1.5 mm
2
for power supply and the relay control outputs
– 1 mm
2
for the detectors and the remote control
• Apply power (230 V~) and check its presence across terminals 2 and 3
• Switch off power, insert the electronic module in the case, pressing it as far as it will go.
13. OPERATION
RTE 98. is an analogue compensating controller for:
– compensated control of a heating circuit. Three-wire control of a motorized valve or On-Off of single-stage burners
and On-Off of circulation pump.
13.
1
Control curve
The flow temperature requested by the controller (detector B1) is changed in relation to the
outside
tem pe ra tu re
(detector B2) and to the
heating control curve
.
The controller compares the actual value of the flow temperature with that corresponding to the curve and, in the
event of a difference, adjusts, with PI control action (Proportional Band Bp and Integral Time ti, both preset), the
motorised valve to cancel this difference.
B1 – Flow detector
B2 – Outside detector
R – Remote control
C – Curve adjustment
E – Boiler
M – Pump
N – RTE 98. controller
Y – Valve
0 – Valve closed
10 – Valve open
Pb – Proportional band
∆
t – On-Off differential
On – Burner On
Off – Burner Off
Ta – Desired ambient temperature
te – Actual outside temperature
tm – Actual flow temperature
Tm – Desired flow temperature
12. EXAMPLE OF CONTROL
