Midea M-thermal Mono Series, Installation And Owner'S Manual

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60
Before switching on the unit, read following
recommendations:
The installer is obliged to verify correct operation of unit
after installation.
11 TEST RUN AND FINAL
CHECKS
11.1 Final checks
When the complete installation and all necessary
settings have been carried out, close all front panels
of the unit and refit the unit cover.
The service panel of the switch box may only be
opened by a licensed electrician for maintenance
purposes.
If required, the installer can perform a manual test run
operation at any time to check correct operation of air
purge, heating, cooling and domestic water heating, refer
to 10.6.11 “Test run”.
11.2 Test run operation (manually)
That during the first running period of the unit,
required power input may be higher than stated
on the nameplate of the unit. This phenomenon
originates from the compressor that needs
elapse of a 50 hours run in period before
reaching smooth operation and stable power
consumption.
NOTE
In order to ensure optimal availability of the unit, a number
of checks and inspections on the unit and the field wiring
have to be carried out at regular intervals.
This maintenance needs to be carried out by your local
technician.
In order to ensure optimal availability of the unit, a number
of checks and inspections on the unit and the field wiring
have to be carried out at regular intervals.
This maintenance has to be carried out by your local
technician.
12 MAINTENANCE AND
SERVICE
DANGER
ELECTRIC SHOCK
Before carrying out any maintenance or
repairing activity, must switch off the power
supply on the supply panel.
Do not touch any live part for 10 minutes after
the power supply is turned off.
The crank heater of compressor may operate
even in standby.
Please note that some sections of the electric
component box are hot.
Forbid touch any conductive parts.
Forbid rinse the unit. It may cause electric
shock or fire.
Forbid leave the unit unattended when
service panel is removed.
Make sure that the disposal of the glycol solution is done
in accordance with relevant local laws and regulations.
Water pressure
Check the water pressure, if it is below 1 bar,fill water
to the system.
Water filter
Clean the water filter.
Water pressure relief valve
Check for correct operation of the pressure relief
valve by turning the black knob on the valve
counter-clockWise:
-If you do not hear a clacking sound, contact your
local dealer.
-In case the water keeps running out of the unit, close
both the water inlet and outlet shut-off valves first and
then contact your local dealer.
Pressure relief valve hose
Check that the pressure relief valve hose is
positioned appropriately to drain the water.
Backup heater vessel insulation cover
Check that the backup heater insulation cover is
fastened tightly around the backup heater vessel.
Domestic hot water tank pressure relief valve (field
supply) Applies only to installations with a domestic
hot water tank. Check for correct operation of the
pressure relief valve on the domestic hot water tank.
Domestic hot water tank booster heater
Applies only to installations with a domestic hot water
tank. It is advisable to remove lime buildup on the
booster heater to extend its life span, especially in
regions with hard water. To do so, drain the domestic
hot water tank, remove the booster heater from the
domestic hot water tank and immerse in a bucket (or
similar) with lime-removing product for 24 hours.
Unit switch box
-Carry out a thorough visual inspection of the switch
box and look for obvious defects such as loose
connections or defective wiring.
-Check for correct operation of contactors with an
ohm meter. All contacts of these contactors must be
in open position.
Use of glycol (Refer to 9.4.4 "Water circuit anti-freeze
protection") Document the glycol concentration and
the pH-value in the system at least once a year.
-A PH-value below 8.0 indicates that a significant
portion of the inhibitor has been depleted and that
more inhibitor needs to be added.
-When the PH-value is below 7.0 then oxidation of the
glycol occurred, the system should be drained and
flushed thoroughly before severe damage occurs.
The following checks must be performed at least once a
year by qualified person.