Electra Air-Conditioning MQH 10T, Installation And Maintenance Manual

18

Control System

6       MINICHILLER CONTROL

4) 

5) 

If an alarm is occured, the alarm code is displayed, but 
after 30', even if the alarm is still active, the display shows 
again the mode but "Alar" message is displayed for 2' 
every 10' when an alarm is active. When we enter in 
Alarm list, the first alarm code displayed is the last 
occurred.

Table 4

Alarms Table

Fault description

Fault 
code

ADC

CPE

EPF

REF

CPNC

EPNC

EWTH

EWTL

LWTH

LWTL

OATH

OATL

OCTL

OCTH

HP

HPC

LP

LO

HI

Cl

CIH

DEIC

OFF

COOL

HEAT

FS

CF1

OF1

PF

LOu

CONF

CFC1

ADC error

Turn on the main switch of the power line.

1) 

For an ideal heating of the oil in the compressor's crank-
case and for a proper removal of the refrigerant from the 
oil, the operation described in sub-paragraph 1) above 
should be performed several hours before the actual 
start-up of the equipment.

2) 

6.1.2   Starting and using the Unit

To properly use the unit in full safety, please read and under-
stand the instructions provided below.

1) 

2) 

3) 

Table 3

Status display

Display       Description

When compressor is operating

Compressor in heat mode

De-ice in operation

Off mode

Cool mode with no compressors on

Heat mode with no heating on

Not allowed configuration

Low water volume

PF input open, pump internal overload

OF1 input open, outdoor fan overload

CF1 input open, compressor 1 overload

High pressure cut-out

Condensing pressure transducer failure, out of range.

Condensing pressure transducer failure, no change error.

Evaporating pressure transducer failure, no change error.

Entering water temperature sensor short circuited

Entering water temperature sensor disconnected

Leaving water temperature sensor short circuited

Leaving water temperature sensor disconnected

Outdoor air temperature sensor short circuited

Coil temperature sensor disconnected

Outdoor air temperature sensor disconnected

Coil temperature sensor short circuited

High pressure protection, automatic reset for first three 
times

Low pressure limit, unit cut out

Leaving water temperature below allowed limits

Entering water temperature is too high

Flow switch opens, low water flow

CP and EP no change,compressor not operating (burn out 
or phase change).

Refrigerant leak - low pressures.

Evaporating pressure transducer failure, out of range.

6.1     Operating instructions 
6.1.1  Before start-up

Before starting the equipment:

English

To start the unit, 

close the remote switch according  to 

requirement, if display show OFF mode, press the right 
button on display ^ for 5 seconds, please refer to the 
wiredigram (see chapter 4.9). Break the connection the 
unit willstop.    

During the normal operation,if the connection between 
No.6 and No. 7 terminal is closed, the unit will operate in 
heating mode. When the connection is opened, the unit 
wiu operate in cooling mode.

To modify the set-points,

 press both ^ and > keys at the 

same time for 5s, then the "OPEr" message appears on 
the display. The parameters are scrolled using the ^ 
button and selected using the > button. When selected, 
the values can be changed by using the ^  button to scroll 
from the present value to max then min and can be 
selected by pushing the > button. After selection the menu 
will return to the beginning of the same parameter change 
menu. If no button is pressed for 10s the display reverts 
back to normal mode. Table  5 shows the list of standard 
parameters.

During  the normal operation the current value of entering 
water temperature is displayed flashing alternatively with 
the current status. To display other useful data, go to 
level l,  use the ^ button to scroll the menu, and use the > 
button to select the display value. The display data are 
shown is Table 6.