EVCO EVK914N9 User Manual

Page 3

EVCO S.p.A. • Code 104K914E114 • page /5

maintenance LED
if on, compressor maintenance is required:
- parameter C10
Alarms LED
if it is on, an alarm or error is in progress

Celsius grade LED
if it is on, the unit of measurement of the temperature will
be the degree Celsius:
- parameter P2

Fahrenheit grade LED
if it is on, the unit of measurement of the temperature will
be the degree Fahrenheit:
- parameter P2
on/stand-by LED
if it is on, the device will be in the stand-by status
if it flashes, the instrument has been switched-on/off in
manual mode during a switch-on/off period with time
bands.

CODE MEANING

Loc

the keyboard is blocked; see paragraph 2.9

ObSt

the “overboost” function is in progress

ALARMS

7.1 Alarms

CODE MEANING

Minimum alarm temperatures
Solutions:
• check the temperature associated to the alarm
• see parameters A0, A1, A2 and A11
Main consequences:
• the instrument will continue to function normally

Maximum temperature alarm
Solutions:
• check the temperature associated to the alarm
• see parameters A3, A4, A5 and A11
Main consequences:
• the instrument will continue to function normally

Pressure switch input alarm
Solutions:
• check the causes of input activation
• see parameters i0, i1 and i2
Main consequences:
• the compressor will be switched off

iSd

Blocked instrument alarm
Solutions:
• check the causes of pressure switch input activation
• switch off and re-start the instrument or suspend the

power supply

• see parameters i0, i1, i2, i8 and i9
Main consequences:
• the compressor will be switched off
• the heating elements will operate like the compressor

during normal operation (see paragraph 5.1)

FiL

maintenance LED
Solutions:
• see parameter C10
• press and release a key to silence the buzzer; silencing the

buzzer also causes the deletion of the compressor oper-
ating hours

Main consequences:
• the instrument will continue to function normally

When the problem that caused the alarm disappears, the instrument
returns to normal operation, except during blocked instrument alarm
(code “iSd”) which requires that the instrument is switched off or the
power supply cut off.
8

INTERNAL DIAGNOSTICS

8.1 Internal diagnostics

CODE MEANING

Pr1

DHW tank upper part probe error
Solutions:
• see parameter P01
• check the integrity of the probe
• check the device-probe connection
• check the temperature of the upper part of the DHW tank
Main consequences:
• the regulators will switch off

Pr2

DHW tank lower part probe error
Solutions:
• the same as the previous case but relative to the DHE tank

lower part probe

Main consequences:
• the regulators will switch off

Pr3

Evaporator probe error.
Solutions:
• the same as the preceding case but with respect to the

evaporator probe

Main consequences:
• the instrument will continue to function normally

PT • 09/14

rtc

Clock error
Solutions:
• changing the date and time
Main consequences:
• instrument switch-on/off with time bands will not be

available

When the problem that caused the alarm disappears, the instrument
returns to normal operation, with the exception of the clock error
(code “rtc”) which requires that the date and hour be set.

TECHNICAL DATA

9.1 Technical data
Case: grey self-extinguishing.
Front panel protection rating: IP 65.
Connections: screw terminal boards (power supply and outputs),
removable terminal board (inputs), 6-pole connector (serial port on
request), removable terminal board (at the remote indictor, on request);
removable spring terminal board (power supply and outputs) on
request.
Operating temperature: from 0 to 55 °C (from 32 to 131 °F,
10 ... 90% relative humidity without condensate).
Power: 12 VAC/DC (or 12-24 VAC/DC), 50/60 Hz, 3,5 VA
(approximate) or 115 ... 230 VAC, 50/60 Hz, 5 VA (approximate).
Clock: incorporated (EVK914 only).
Maintenance of clock data with power-cut: 24 hr fully-charged
battery.
Battery charging time: 2 min without interruption (the battery is
recharged by the instrument’s power supply).
Alarm buzzer: on request.
Measure input: 3 (probe in lower part of DHW tank, probe in upper
part of DHW tank and evaporator probe) for
PTC/NTC probes, Pt 1000 2 wires).
Digital inputs: 2 (pressure switch input and additional photovoltaic
input) for NO/NC contact (potential-free contact, 5 V 1 mA).
Measurement field: from -50 to 150 °C (from -50 to 300 °F) for PTC
probe, from -40 to 105 °C (from -40 to 220 °F) for NTC probe, from
-100 to 150 °C (from -145 to 300 °F) for Pt 1000 probe.
Resolution: 0.1 °C/1 °C/0.1 °F/1 °F.
Digital outputs: 4 relays:

• relay K1 (compressor): 16 A res. @ 250 VAC

(changeover switch)

• relay K2 (defrosting): 8 A res. @ 250 VAC

(changeover switch)

• relay k3 (fan): 8 A res. @ 250 VCA (NO contact)
• relay K4 (heating elements): 8 A res. @ 250

VAC (changeover switch).

The maximum current accepted on relay 1 is 10 A.
Communication ports:

2 ports:
• TTL serial port for communication with

the EVKEY programming key, with the
Parameters Manager set-up software
(via a serial interface) or for that for
monitoring or supervision of
CloudEvolution plants (through a
gateway); on request

• communication port with EVT100

remote indicator, on request.