Carbolite R38 User manual

MC24 - 1.00
Operating Instructions
Temperature Controller
R38
See also the main manual for the oven or other product to which
the controller is fitted.
CONTENTS
section page
1 R 38 – Description 2
2 Operation 2
3 Process Timer (if fitted) 3
R38
U
OUT1

R38 Controller
2 MC24 – 1.00
1. R38 –DESCRIPTION
1.1. R38 - PID
This is a PID version of the R38 PID controller by Technologic. The PID control produces
pulsed power to the elements. It features simple adjustment of the setpoint, a large display of the
current temperature, and an indication of when heating is occurring.
2. OPERATION
2.1. Operating Cycle
The oven is fitted with a combined Supply light and Instrument switch. The light (green) is on
whenever the oven is connected to the supply. The switch cuts off power to the control circuit.
If the oven has fan-assisted circulation; the fan is on when the instrument switch is on.
Connect the oven to the electrical supply. The Supply light should glow.
Operate the instrument switch to activate the temperature controller. The controller becomes
illuminated and goes through a short test cycle.
If no process timer is fitter, the controller becomes illuminated and goes through a short test
cycle. If a timer is fitted, the controller may not become illuminated when the oven is switched
on – to start the controller, press the U button on the timer once (see section 3).
Adjust the temperature controller - see section 2.2.
Process timer option. See section 3 for timer setting and operation.
Overtemperature option. If the hydraulic thermostat overtemperature option is fitted, set the
rotary dial to the desired protection temperature.
Unless a process timer is fitted, and is off, the oven starts to heat up according to the controller
set point.
To turn the oven off, set the Instrument switch to it’s off position; the controller display will go
blank. If the oven is to be left off unattended, isolate it the electrical supply.
2.2. Controller Operation
When switched on, the controller lights up, goes through a short test routine, and then displays
the measured temperature and starts to control. The output light OUT1 indicates when heating is
occurring.
R38
U
OUT1

R38 Controller
MC24 – 1.00 3
To alter the setpoint, press the up or down arrow key once, “SPI” flashes. Then use the up and
down arrow keys to adjust the setpoint. Press the Pkey to accept.
3. PROCESS TIMER (IF FITTED)
To set a process time:
Press the Pkey; t1 shows momentarily on the display and the SET/CNT light flashes quickly.
Use the arrow keys to adjust the process time, which is in hours and minutes (hr.mn). Wait 5
seconds without pressing a key, or press the U key once, and the display returns to normal.
If a process time of zero is set then the timer is disabled and the controller operates as though the
timer is not present.
To start the timer:
Press the Ukey once. Timing starts. The SET/CNT light flashes slowly while timing is in
progress, and the display counts down (at the end of each minute).
At the end of timing the OUT light comes on continuously and power to the temperature
controller is cut off.
To reset the timer after timing has finished:
Press the Ukey once. The timer is now idle: it is not stopping the oven from heating, nor is it
timing.
Power is only supplied to the temperature controller when the timer is reset or is timing.
To stop the timer during timing:
A press of Uduring counting down stops the timer. The temperature controller remains on.
It is not possible to resume timing from where it stopped: the next press Uresets the timer.
TT 34
U
SET
CNT

R38 Controller
3.1. Overtemperature Control (if fitted)
The hydraulic thermostat overtemperature controller should typically be set at 15°C above the
main controller. If an overtemperature condition occurs, always investigate the possibility that
the main control system has failed.
An overtemperature condition always cuts off power to the heating elements. To reset the
condition, first either allow the oven to cool, or increase the overtemperature setting.
If the overtemperature trip operates then a click occurs and a warning light near the thermostat
lights up; the reset button on the thermostat pops out. The reset button is hidden behind the
control dial: to reset the oven it is necessary to turn the thermostat dial till the hole lines up with
the reset button and press it using a small diameter rod.
Co
py
ri
g
ht © 2010 Carbolite Ltd.
For preventive maintenance, repair and calibration of all Furnace
and Oven products, please contact:
Thermal Engineering Services
Telephone: UK: 0845 3308035 Int: [phone]
Fax: UK: 0845 3308036 Int: [phone]
Email: service
@
thermalserve.com
Carbolite, Parsons Lane, Hope,
Hope Valley, S33 6RB, England.
Telephone: [phone]
Int: [phone]
Facsimile: [phone]
Int: [phone]
E-mail: [e-mail]
MC24 - 1.00 10/08/10 R38

Thank you for reading this data sheet.
For pricing or for further information, please contact us at our UK Office, using the details
below.
UK Office
Keison Products,
P.O. Box 2124, Chelmsford, Essex, CM1 3UP, Engl nd.
Tel: [phone]
F x: [phone]
Em il: s [email protected]
Please note - Product designs and specifications are sub ect to change without notice. The user is responsible for determining the
suitability of this product.