Midea LSBLG365/MCFN

Flooded type water cooled screw chiller (PCB Control) MCAC-CTSM-2012-11
63
refrigerated
cabinets also
reach the set
temperature
(only for
composite
refrigerated
cabinet)
hole no bubbles. To ensure proper cooling
temperature (greater than 5 ° C); or refrigerant filling
Valve is too small Replaced with a larger valve
Valves damaged or
connected incorrectly the
stator
The stator and the valve and disconnect the cable
connection, with ordinary measuring coil resistance
tester.
Two coil resistance should be around 36 Euro.
Otherwise, replace the stator. Finally, check the
cable connection to connect the drive
Valve can not open Started using the manual control valve fully open. If
the superheat value is still high, check the electrical
wiring and / or replace the valve
Freezers reach
the set
temperature,
and the valve
position is
always 0 step
(only for
composite
refrigerated
cabinet)
tLAN or pLAN drive
configured not begin to
control the valve remains
closed
Check tLAN / pLAN wiring. Check that the drive to
connect with the pCO application (if equipped)
properly manage the drive start signal. Check that
the drive is not in standalone mode
Configured as a
stand-alone mode, the
drive does not begin to
control the valve remains
closed
Check the digital input terminal. Check that when the
control signal input correctly when closed. Check
that the drive is in stand-alone mode
2.3 Removal and Service of Key Parts
In order to do maintenance when convenient, a leaky tube can be plugged until retubing can be done if
damaged tubes are not too many. The number of tubes plugged determines how soon the evaporator
must be retubed. Plugging tubes will result in loss of capacity and efficiency as well as increased pump
power. Failed tubes should be replaced as soon as possible. Up to 10% of the total number of tubes can
be plugged before retubing is necessary. If the problem is much more serious, contact your local Midea
or your local representative for assistance.
Caution
Use extreme care when installing plugs to prevent damage to the tube sheet section between the holes.
Retubing
Retubing must be done by qualified personnel experienced in boiler maintenance and repair. Most
standard procedures can be followed when retubing the evaporators.
Place one drop of Loctite or equivalent on top of tube prior to rolling. This material is intended to “wick”
into the area of the tube that is not rolled into the tube sheet, and prevent fluid from accumulating
between the tube and the tube sheet. New tubes must also be rolled into the center tube sheet to
prevent circuit to circuit leaks.
Tightening cooler/condenser head bolts
When reassembling the evaporator head, always check the condition of the O-rings first. The O-ring
should be replaced if there are visible signs of deterioration, cuts or damage. Apply a thin film of grease
to the O-ring before installation. This will aid in holding the O-ring in the groove while the head is installed.
Torque all bolts in sequence as shown in Fig.:6.2.1