Specifications

ManualsBrandsCarrier ManualsFurnace58PHA/PHX Installation, start-up, operating and

XR03CX-HF.doc XR03CX& 1/2

D IGITAL CONTROLLER

XR03CX

1. CONTENTS

1. Contents ___________________________________________________________________________ 1

2. General warnings ____________________________________________________________________ 1

3. General description___________________________________________________________________ 1

4. Regulation__________________________________________________________________________ 1

5. Defrost ____________________________________________________________________________ 1

6. Front panel commands ________________________________________________________________ 1

7. Parameters _________________________________________________________________________ 1

8. Installation and mounting ______________________________________________________________ 2

9. Electrical connections _________________________________________________________________ 2

10. How to use the hot key ________________________________________________________________ 2

11. Alarm signalling______________________________________________________________________ 2

12. Technical data_______________________________________________________________________ 2

13. Connections ________________________________________________________________________ 2

14. Default setting values _________________________________________________________________ 2

2. GENERAL WARNINGS

PLEASE READ BEFORE USING THIS MANUAL

• This manual is part of the product and should be kept near the instrument for easy and quick reference.

• The instrument shall not be used for purposes different from those described hereunder. It cannot be used as a

safety device.

• Check the application limits before proceeding.

SAFETY PRECAUTIONS

• Check the supply voltage is correct before connecting the instrument.

• Do not expose to water or moisture: use the controller only within the operating limits avoiding sudden

temperature changes with high atmospheric humidity to prevent formation of condensation

• Warning: disconnect all electrical connections before any kind of maintenance.

• Fit the probe where it is not accessible by the End User. The instrument must not be opened.

• In case of failure or faulty operation send the instrument back to the distributor or to “Dixell S.p.A.” (see address)

with a detailed description of the fault.

• Consider the maximum current which can be applied to each relay (see Technical Data).

• Ensure that the wires for probes, loads and the power supply are separated and far enough from each other,

without crossing or intertwining.

• In case of applications in industrial environments, the use of mains filters (our mod. FT1) in parallel with inductive

loads could be useful.

3. GENERAL DESCRIPTION

Model XR03CX, format 32 x 74 x 50 mm, is a digital thermostat with off cycle defrost designed for refrigeration

applications at normal temperature. It provides a relay output to drive the compressor. It is also provided with 2 NTC

probe input. The instrument is fully configurable through special parameters that can be easily programmed through the

keyboard or the by HOTKEY.

4. REGULATION

THE REGULATION OUTPUT

The regulation is performed according to

the temperature measured by the

thermostat probe with a positive differential

from the set point: if the temperature

increases and reaches set point plus

differential the compressor is started and

then turned off when the temperatur

In case of fault in the thermostat probe the start and stop of the compressor are timed through parameters “Cy” and

“Cn”.

5. DEFROST

Defrost is performed through an off cycle of the compressor. Parameter “id” controls the interval between

defrost cycles, while its length is controlled by parameter “nd”. A defrost indicator light will illuminate during

defrost and also after the defrost ends according to parameter “Fd”

6. FRONT PANEL COMMANDS

To display target set point, in

programming mode it selects a

parameter or confirm an

operation

To start a manual defrost

In programming mode it

browses the parameter codes or

increases the displayed value

AUX

In programming mode it

browses the parameter codes or

decreases the displayed value

KEYS COMBINATION

To lock or unlock the keyboard

To enter in programming mode

To return to room temperature display

LED

MODO

SIGNIFICATO

Compressor enabled

Flashing

Anti short cycle delay enabled (AC parameter)

Defrost in progress

Measurement unit

Flashing

Programming mode

Measurement unit

Flashing

Programming mode

HOW TO SEE THE SET POINT

1. Push and immediately release the SET key, the set point will be shown;

2. Push and immediately release the SET key or wait about 5s to return to normal visualisation.

HOW TO CHANGE THE SETPOINT

1. Push the SET key for more than 2 seconds to change the Set point value;

2. The value of the set point will be displayed and the “°C” or “°F” LED starts blinking;

3. To change the Set value push the or arrows within 10s.

4. To memorise the new set point value push the SET key again or wait 10s.

HOW TO START A MANUAL DEFROST (ONLY XR02CX)

Push the DEF

key for more than 2 seconds and a manual defrost will start

HOW TO CHANGE A PARAMETER VALUE

To change the parameter’s value operate as follows:

1. Enter the Programming mode by pressing the SET+ keys for 3s (“°C” or “°F”

LED starts blinking).

2. Select the required parameter. Press the “SET” key to display its value

3. Use or to change its value.

4. Press “SET” to store the new value and move to the following parameter.

To exit: Press SET+ or wait 15s without pressing a key.

NOTE: the set value is stored even when the procedure is exited by waiting the time-out to expire.

HIDDEN MENU

The hidden menu includes all the parameters of the instrument .HOW TO ENTER THE HIDDEN MENU

1. Enter the Programming mode by pressing the SET+ keys for 3s (“°C” or “°F”

LED starts blinking).

2. Released the keys, then push again the SET+ keys for more than 7s. The L2 label will be displayed

immediately followed from the Hy parameter.

NOW YOU ARE IN THE HIDDEN MENU.

3. Select the required parameter.

4. Press the “SET” key to display its value

5. Use or to change its value.

6. Press “SET” to store the new value and move to the following parameter.

To exit: Press SET+ or wait 15s without pressing a key.

NOTE1: if no parameters are present in L1, after 3s the “nP” message is displayed. Keep the keys pushed till

the L2 message is displayed.

NOTE2: the set value is stored even when the procedure is exited by waiting the time-out to expire.

HOW TO MOVE A PARAMETER FROM THE HIDDEN MENU TO THE FIRST LEVEL

AND VICEVERSA.

Each parameter present in the HIDDEN MENU can be removed or put into “THE FIRST LEVEL” (user level) by

pressing SET+ . In HIDDEN MENU when a parameter is present in First Level the decimal point is on.

TO LOCK THE KEYBOARD

1. Press for more than 3s the and keys together.

2. The “OF” message will be displayed and the keyboard will be locked. If a key is pressed more than 3s

the “OF” message will be displayed.

TO UNLOCK THE KEYBOARD

Press together for more than 3s the and keys till the “on” message will be displayed.

7. PARAMETERS

REGULATION

Hy Differential: (0,1°C ÷ 25°C) Intervention differential for set point. Compressor Cut IN is SET POINT +

differential (Hy). Compressor Cut OUT is when the temperature reaches the set point.

LS Minimum SET POINT: (-55°C÷SET/-58°F÷SET): Sets the minimum value for the set point..

US Maximum SET POINT: (SET÷99°C/ SET÷99°F). Set the maximum value for set point.

ot First probe calibration: (-9.9÷9.9°C) allows to adjust possible offset of the first probe.

P2 Evaporator probe presence: n= not present; y= the defrost stops by temperature.

oE Second probe calibration: (-9.9÷9.9°C) allows to adjust possible offset of the second probe

AC Anti-short cycle delay: (0÷50 min) minimum interval between the compressor stop and the following

restart.

Cy Compressor ON time with faulty probe: (0÷99 min) time during which the compressor is active in case

of faulty thermostat probe. With Cy=0 compressor is always OFF.

Cn Compressor OFF time with faulty probe: (0÷99 min) time during which the compressor is OFF in case

of faulty thermostat probe. With Cn=0 compressor is always active.

DISPLAY

CF Measurement unit: (°C÷°F) °C =Celsius; °F =Fahrenheit. WARNING: When the measurement unit is

changed the SET point and the values of the parameters Hy, LS, US, oE, o1, AU, AL have to be

checked and modified if necessary).

rE Resolution (only for °C):(dE ÷ in) dE= decimal between -9.9 and 9.9°C; in= integer;

Ld Default display: (P1 ÷ P2) P1= thermostat probe; P2= evaporator probe. SP=Set point

dy Display delay: (0÷15 min.) when the temperature increases, the display is updated of 1 °C/1°F after this

time.

DEFROST

dE Defrost termination temperature: (-50÷50°C) if ot=Y it sets the temperature measured by the

evaporator probe, which causes the end of defrost.

id Interval between defrost cycles: (0÷99 ore) Determines the time interval between the beginning of two

defrost cycles.

nd Maximum length for defrost: (0÷99 min. with 0 no defrost) when P2 = n, (no evaporator probe: timed

defrost) it sets the defrost duration, when P2 = y (defrost end based on temperature) it sets the maximum

length for defrost.

dF Display during defrost: (rt / it / St / dF) rt= real temperature; it= start defrost temperature; St= SET-

POINT; dF= label dF.