Delta RC-33 Operations Instructions download pdf (Page 2)

Frontal dimensions: 34.5 x 76.5 mm

Mounting hole dim.: 29 x 71 mm

REAR BOX

3.00 SETTING THE RC33

3.10 Menu Level 1 - Adjust the main (SEt) and secondary SET POINT (desired temperature value)

1) Press and release the Enter key “↵”, SEt is displayed. The upper point will flash to indicate programming mode entering. To view/change St2,

press “5” or “6” to move to St2 (energy saving secondary Set Point);

2) Press and release “↵” to view the Set Point value, adjust it by using “5” or “6” (it is only possible values inside the SLo and SHi range);

3) Press and release “↵” to confirm the data, after 15sec. the RC33 will leave programming mode and the new data will be stored in the memory.

3.20 Menu Level 2 - Adjust all the other OPERATING PARAMETERS

1) Press the Enter key “↵” and hold it for 6 seconds. The upper point will flash to indicate programming mode entering. If no password is set

(PSS=0), the code of the first variable SHy will appear, go to point 3. If password is set, will appear “PAS” request;

2) (password request) Press and release the Enter key “↵”, “0” will be shown; press “5” to enter the right password value and then press and

release the Enter key to confirm it. If the value entered does not match the stored password (PSS), the controller exits the programming mode;

3) (SHy showed) press “5” or “6” to scroll all the parameter codes;

4) While a code is displayed press and release the Enter key “↵” to view its content, adjust it by pressing “5” or “6”;

5) Press and release “↵” to confirm the data, after 15sec. the RC33 will quit the programming mode and the data will be stored in the memory.

WARNING:

- the instrument must not be reset before leaving the programming mode, otherwise the new setting will be lost;

- if the “Function” key is pressed during the programming mode, the user will exit the progr. mode without saving, RC33 will loose the new setting;

- the controller authomatically interrupts any setting operation if any push-button isn’t pressed for at least 15 seconds and store the current data;

- after having modified any parameter the controller must be restarted (unplug and plug again) .

3.30 Keyboard locking

Press and hold both the Enter key “↵” + the Down key “6” for 6 second, in order to lock and unlock the keyboard (the upper-left point will flash).

If the controller shows “Pof” it means the keyboard is locked, if it shows “Pon” the keyboard is unlocked.

When the keyboard is locked it is possible to view any parameters value but not to change them.

3.40 How to show the stored alarm temperatures (Haccp feature)

The RC33 stores the last 3 temperature alarm events: the temperature of probe 1 has been lower than ALo or higher than AHi.

- when the controller is showing the temperature (i.e. not in programming mode), press and release the “Function” key;

- it will show “HcP” (Haccp) and, if any alarm data are stored, it will show “AL1”, min/max temperature reached and for how long (minutes) the

temperature 1 was over ALo or AHi, then “AL2”, min/max alarm … . AL1 is referred to the most recent event. AL3 is the oldest.

When the RC33 is showing the Haccp data, pressing the “Function” key for 5 seconds will erase the alarm data stored (it will show “---“).

The controller will show only data for alarms of events which have come back to normal. If an alarm is running, it could be ended decreasing the ALo

or increasing the AHi value. At the end of an alarm the RC33 stores the Haccp data in its memory.

During the defrost actions there is no alarm recording. RC33 doesn’t have a battery inside, if power fails occurs it does not check/record any data.

Changing the temperature measure unit (“unt” param.), the logged temperatures / parameters values reflect unit set in the past (not convert).

2.00 TECHNICAL SPECIFICATIONS

POWER : 230 Vac ±10% 50/60 Hz (3VA max);

SUPPLY or 115 Vac ±10% 50/60 Hz (3VA max);

or 12 Vac/dc ±10% (150mA max)

(use only SELV power s.);

or 9..24 Vac/dc

(use only SELV power supply)

INPUTS: 2 Ntc/Ptc sensors, 1 Digital-In external contact (max 1mA);

Probes types: Ntc standard 10Kohm@25°C Beta=3435-25/85;

Ntc 5Kohm@25°C Beta=3980-25/100;

Ptc 990ohm@25°C KTY81(2)-121.

OUTPUTS: 1 spst relay 250Vac 12A max resistive (compressor);

1 spst relay 250Vac 5A max resistive (fan);

1 spdt relay 250Vac 8A max resistive (defrost).

(the max const. current in the common terminal #1 is 12A)

SERIAL PORT: TTL leve

l, ModBus protocol, RTU type, 9600 baud,

8bit char, even parity, 1 bit stop;

DISPLAY: 3 digit LED, 14 mm height, high intensity red;

MEASURING RANGE: -50 … +150 °C / -50 ... +302 °F (if Ptc);

- resolution: 0.1 °C / 0.1 °F (within –19.9 .. +99.9);

- accuracy @25°C: ±0.5 °C + 1 digit;

- connections terminal block with screw for max 2.5mm

gauge wire;

- operating temperature: –10 … +60 °C;

- storage temperature: –25 … +70 °C;

- storage humidity: 30 … 90 % r.H., non condensing;

- plastic casing (PC+ABS rear box, PC frontal panel);

- frontal panel IP65, if appropriate mounting gasket;

- max temperature of the switch head: 60 °C;

- pollution degree: 2;

- rated impulse voltage: 2.5 KV;

- PTI of insulating material: 175 (circuit board 250);

- class of protection against electric shock: II (for correct install.);

- class of protection against voltage sourges: category II;

- type of disconnection: 1.B micro disconnection (relay);

- software class: A.

Typical terminal connections (See the label on top of the instrument

for the right power supply diagram connection).

4.10 COMPRESSOR parameters

Param.

code

Description Range Default

SEt Set point: it is the desired temperature of the cold room. SLo .. SHi °C -5 °C

St2

Secondary set point. Useful for the external contact function: When Eio=±3, switching an external contact, it is possible to

change the active Set point value between SEt and St2.

SLo .. SHi °C -2 °C

SHy

Set point Hysteresis (ex HyS). Delta temperature value to avoid regulating oscillations.

The compressor switches off at SEt and switches on at SEt+SHy value (ref. temperature probe 1).

0.1 .. 20 °C 2 °C

SLo Low Set Point limit (ex LoS). It is the min value of SEt parameter range. The user cannot select a SEt value lower than SLo. -50 .. SHi °C -40 °C

SHi High Set Point limit (ex HiS). It is the max value of SEt parameter range. The user cannot select a SEt value higher than SHi. SLo .. 150 °C 110 °C

rA1

Anticycle retard (ex Acy). When the compressor output is switched-off, the controller waits at least rA1 minutes to switch on

again the relay. It is also the delay for the first activation of the compressor relay at power on.

0 .. 20 minutes 0 m

ro1

Retard to switch on the compressor. It is the delay to switch on the compressor relay from the request to activate it.

When the cold room temperature requires to activate the compressor output, the software starts to waiting ro1 minutes before

switching on the output relay. This delay is not considered when PF1. After defrost, compressor waits also ro1 (see also dAd).

0 .. 20 minutes 0 m

PEc

Probe 1 error, compressor mode (ex CPF). If there is a probe 1 fault (temperature out of range, shortcircuit or probe

disconnected, RC33 measur.circuit fault) the RC33 starts to manage the compressor relay by time and shows PF1 on display.

0: compressor always off; 1: compressor always on; 2: compressor on for PE1 minutes and off for PE0 minutes.

0 .. 2 2

PE1 Probe 1 error, compressor on (ex Con). The time to switch on the compressor relay when there is a PF1 error (if PEc=2). 0 .. 45 minutes 15 m

PE0 Probe 1 error, compressor off (ex Cof). The time to switch off the compressor relay when there is a PF1 error (if PEc=2). 0 .. 45 minutes 30 m

SEt+SHy

temperature probe 1

SEt

off

Compressor

output

off

rA1

ro1

Compressor

output

time

rA1

ro1

4.20 ALARM parameters

The temperature alarm events are always linked to the probe 1 (cold room temperature). The alarm hysteresis is 0,4 °C fixed.

Param.

code

Description Range Default

AtP

Alarm type values.

0: ALo, AHi are absolute temperature values; 1: ALo, AHi are temperature values relating to the SEt value.

0 .. 1 0

ALo

Low temperature threshold alarm (ex LoA). If the temperature goes below this value (ALo-0,4), the controller activates an

alarm signal on the display and starts recording the minimum temperature and the duration of the alarm (Haccp).

AtP=0, –50..(AHi-1)

AtP=1, -50 .. –0.5

-40 °C

AHi

High temperature threshold alarm (ex HiA). If the cold room temperature goes up over this limit value (AHi+0,4), the controller

activates an alarm signal on the display and starts to record the max temperature and the time duration of the alarm signal.

AtP=0, (ALo+1)..150

AtP=1, 0.5 .. 150

110 °C

Adi Alarm delay at the power on. The RC33 does not check any temperature alarm for Adi hours from the power on. 0 .. 10 hours 0 h

ALd Alarm delay on running time. The temperature must be in the alarm range for ALd minutes to switch on the alarm signal. 0 .. 120 minutes 0 m

AdF Alarm delay after defrost. After the end of any defrost, the RC33 waits AdF minutes before checking any temp. alarm. 0 .. 180 minutes 0 m

Ad0

Alarm delay after de-activation of the external contact (digital input).

I.e.: after closing the room door, the RC33 waits Ad0 minutes before checking the temperature for alarm.

0 .. 240 minutes 0 m

Ad1

Alarm delay from the activation of the external contact. The delay count starts immediately without waiting Eid.

I.e.: after opening the room door, the RC33 waits Ad1 minutes before checking the temperature for alarm

0 .. 120 minutes 0 m

Note: The alarm signal management is disabled during the defrost actions (no star, nor stop alarm).

When AtP=1, ALo & AHi are always referred to the SEt value, also if St2

is activated by an external input

4.30 DEFROST parameters

Param.

code

Description Range Default

dPt Defrost time period. It is the period of time between two defrost actions. 1 .. 240 (dtS) 6 h

ddt Defrost duration timeout. It is the max duration of each defrost action. If ddt=0 the defrost function is disabled. 0 .. 240 (dtS) 30 m

dtS

Defrost time scale (ex tiS). It changes the time scale of dPt and ddt.

0: dPt hours, ddt minutes; 1: dPt minutes, ddt seconds;

0 .. 1 0

dEt

Defrost end temperature. During the defrost action, the controller checks the temperature 2 (evaporator). When the evaporator

reaches the dEt value, the controller stops the defrost action (and, if deo>0, it starts defrost optimization). From any start of the

defrost action, the controller stops the defrost after ddt time, even if temperature 2 is less than dEt (timeout end).

-20 .. 100 °C 7 °C

dEo

Defrost end optimization. As the evaporator temperature reaches the dEt value, the RC33 starts to control the evaporator

temperature between dEt and (dEt-2), for dEo minutes. It improves the de-iceing process, keeping a lower evaporator

temperature and avoids an excessive warming of the evaporator area. If dEo=0, the defrost optimization function is disabled.

If dtP=0, it switches on/off the heater relay; if dtP=1, it keeps on the valve output relay and switches on/off the compressor.

When dtP=1 (defrost by hot gas) the dEo function must be disabled (dEo=0), to avoid any excessive stress to the evaporator.

0 .. 60 minutes 10 m

dtP

Defrost type (ex odd): by electrical heater or by hot-gas.

0: by electrical heater. The defrost is performed by stopping the compressor, switch on the defrost output to power on heater;

1: by hot gas. Switch on the compressor output and also the defrost output to activate the turning valve.

0 .. 1 0

dSd

Defrost start delay. It is a delay between the time to start of the defrost action and its real beginning (switch on of the output

relays). At the power on of the controller, it starts the first defrost action after dPt hours + dSd minutes (and the sucessive

starts after dPt). If an external contact activates the defrost action (if Eio=±4), it starts after dSd minutes.

0 .. 120 minutes 0 m

dAd

Delay to switch on the compressor after a defrost end (ex Add). Dripping Time. After a defrost cycle, the compressor is

stopped to assure dripping of possible water still present in the evaporator.

0 .. 120 minutes 0 m

ddd

Displayed during the defrost action.

0: probe 1 temperature at the defrost start; 1: the message “dEF”; 2: the SEt value; 3: the real temperature of probe 1.

When 0, 1, 2, the value will be shown on the display until the controller will have reached again the Set Point value.

0 .. 3 0

WARNING:

during the

installation, take care to set

proper rA1

value to avoid

compressor or relay faults.

63,5

6,8

28,5

TTL serial

port

34,5

( 34,5 x 76 mm )

( 63,5 x 70 mm )

Fan

K1 = SPST 12A 250Vac max resistive

K2 = SPDT 8A 250Vac max resistive

K3 = SPST 5A 250Vac max resistive

RC 33

Comp.

Defrost

room

evaporator

1 2

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Delta RC-33 Operations Instructions Page 2

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