Data Display Of Wired Controller; Care And Maintenance; Removing Scale; Winter Shutdown - mundoclima H12 Series Installation & Owner's Manual

11.2 Digital display of main board
The data display area is divided into Up area and Down area,
with two groups of two-digit half 7-segment digital display,
respectively.
a. Temperature display
Temperature display is used for displaying the total outlet
water temperature of unit system, outlet water temperature
,condenser pipe temperature T3A of system A, condenser
pipe temperature T3B of system B, outdoor environmental
temperature T4, anti-freezing temperature T6 and setting tem-
perature Ts, with allowable data display scope -15℃～70℃.
If the temperature is higher than 70℃, it is displayed as 70℃.
If there is no effective date, it displays "— —" and indication
point C is on.
。
b. Current display
Current display is used for displaying Modular unit system
A compressor current IA or system B compressor current IB,
with allowable display scope 0A~99A. If it is higher than 99A,
it is displayed as 99A. If there is no effective date, it displays
"— —" and indication point A is on.
c. Failure display
It is used for displaying the total failure warning date of unit
or that of Modular unit, with failure display scope E0~EF, E
indicating failure, 0~F indicating failure code. "E-" is displayed
when there is no failure and indication point # is on at the
same time.
d. Protection display
It is used for displaying the total system protection data of unit
or the system protection data of Modular unit, with protection
display scope P0~PF, P indicating system protection, 0~F
indicating protection code. "P-" is displayed when there is no
failure .
e. Unit number display
It is used for displaying the address number of the currently
selected Modular unit, with display scope 0~15 and indication
point # is on at the same time.
f. Display of online unit number and startup unit number They
are used for displaying the total online Modular units of the
whole unit system and the number of the Modular unit under
running state, respectively, with display scope 0~16. Any time
when the spot check page is entered to display or change
Modular unit, it is needed to wait for the up-to-date data of the
Modular unit received and selected by wired controller. Before
receiving the data, the wired controller only displays "——"
on the data display Down area, and the Up area displays the
address number of the Modular unit. No page can be turned,
which continues until the wired controller receives the com-
munication data of this Modular unit.

11.3 Care and maintenance

1) Maintenance period
It's recommended that before cooling in summer and heating
in winter every year, consult local air conditioner customer
service center to check and maintain the unit, to prevent air
conditioner errors which bring inconvenience to your life and
work.
2) Maintenance of main parts
Close attention should be paid to the discharge and suction
pressure during the running process. Find out reasons and
eliminate the failure if abnormality is found.
Control and protect the equipment. See to it that no random
adjustment be made on the set points on site.
Regularly check whether the electric connection is loose, and
whether there is bad contact at the contact point caused by
oxidation and debris etc., and take timely measures if necessary.
Frequently check the work voltage, current and phase balance.
Check the reliability of the electric elements in time. Ineffective
and unreliable elements should be replaced in time.

11.4 Removing scale

After long-time operation, calcium oxide or other minerals will
be settled in the heat transfer surface of the water-side heat
exchanger. These substances will affect the heat transfer
performance when there is too much scale in the heat transfer
surface.
and sequentially cause that electricity consumption increases
and the discharge pressure is too high (or suction pressure too
low). Organic acids such as formic acid, citric acid and acetic acid
may be used to clean the scale. But in no way should cleaning
agent containing fluoroacetic acid or fluoride should be used as
the water-side heat exchange is made from stainless steel and
is easy to be eroded to cause refrigerant leakage. Pay attention
to the following aspects during the cleaning and scale-removing
process:
1) Water-side heat exchanger should be done be professionals.
Please contact the local air-conditioner customer service center.
2) Clean the pipe and heat exchanger with clean water after
cleaning agent is used. Conduct water treatment to prevent water
system from being eroded or re-absorption of scale.
3) In case of using cleaning agent, adjust the density of the agent,
cleaning time and temperature according to the scale settlement
condition.
4) After pickling is completed, neutralization treatment needs
to be done on the waste liquid. Contact relevant company for
treating the treated waste liquid.
5) Protection equipments (such as goggles, gloves, mask
and shoes) must be used during the cleaning process to avoid
breathing in or contacting the agent as the cleaning agent and
neutralization agent is corrosive to eyes, skins and nasal mucosa.

11.5 Winter shutdown

For shutdown in winter, the surface of the unit outside and inside
should be cleaned and dried. Cover the unit to prevent dust. Open
discharge water valve to discharge the stored water in the clean
water system to prevent freezing accident (it is preferable to inject
antifreezer in the pipe).

11.6 Replacing parts

Parts to be replaced should be the ones provided by our com-
pany.
Never replace any part with different part.
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