MT86H
Operation
and
Maintenance
Manual
132
S/N
Symptom
Probable
causes
Solutions
4
High
air
return
pressure
The
sensing
bulb
of
expansion
valve
is
loose.
Tighten
the
sensing
bulb
clamp.
There
is
excessive
refrigerant.
Discharge
the
extra.
The
compressor
leaf
is
damaged.
Replace
the
leaf.
The
compressor
cylinder
gasket
leaks.
Replace
the
cylinder
gasket.
5
Compressor
does
not
work.
The
drive
belt
is
damaged.
Replace
the
belt.
The
clutch
conductor
is
damaged.
Replace
the
conductor.
The
compressor
piston
is
damaged.
Replace
the
compressor.
The
thermostatic
switch
is
in
failure.
Replace
the
thermostatic
switch.
The
clutch
coil
is
damaged.
Replace
the
coil.
6
Poor
refrigeration
effect
The
coil
is
frozen;
the
set
temperature
is
too
high.
Turn
the
thermostatic
switch
downward
to
defrost
it.
Hot
air
enters
cab.
Close
the
door
from
which
hot
air
comes.
There
is
a
lack
of
refrigerant.
Add
refrigerant.
The
high
pressure
is
too
high.
Refer
to
2.
The
return
pressure
is
too
low.
Refer
to
3.
The
return
pressure
is
too
high.
Refer
to
4.
The
thermostatic
switch
is
in
failure.
Replace
the
thermostatic
switch.
7
Evaporator
coil
gets
frozen.
The
adjustment
of
thermostatic
switch
is
inappropriate.
Adjust
it
to
operating
condition.
The
volume
of
air
via
evaporator
is
insufficient.
Check
evaporator
fan.
8
Belt
is
in
failure.
The
belt
pulley
is
not
properly
aligned.
Adjust
the
axial
position
of
belt
pulley.
The
belt
is
too
tight
or
loose.
Adjust
it
correctly.
The
size
and
specification
of
belt
is
incorrect.
Replace
it.
The
idler
bearing
is
damaged.
Replace
the
bearing.
9
Fan
does
not
work.
The
fan
Fuse
is
burnt
out.
Replace
it.
The
control
switch
is
in
failure.
Replace
it.
The
fan
motor
is
damaged.
Replace
it.
The
motor
voltage
is
low.
Check
conductor.
The
fan
is
in
poor
contact.
Check
and
repair
it.
Summary of Contents for MT86H
Page 9: ...MT86H Operation and Maintenance Manual 1 Chapter I Safety ...
Page 10: ...MT86H Operation and Maintenance Manual 2 ...
Page 18: ...MT86H Operation and Maintenance Manual 10 ...
Page 19: ...MT86H Operation and Maintenance Manual 11 Chapter II Product Introduction ...
Page 20: ...MT86H Operation and Maintenance Manual 12 ...
Page 25: ...MT86H Operation and Maintenance Manual 17 Chapter III Operation ...
Page 26: ...MT86H Operation and Maintenance Manual 18 ...
Page 64: ...MT86H Operation and Maintenance Manual 56 ...
Page 142: ...MT86H Operation and Maintenance Manual 134 ...
Page 143: ...MT86H Operation and Maintenance Manual 135 Chapter V Maintenance ...
Page 144: ...MT86H Operation and Maintenance Manual 136 ...
Page 160: ...MT86H Operation and Maintenance Manual 152 3 Lubrication diagram ...
Page 161: ...MT86H Operation and Maintenance Manual 153 Chapter VI Annex ...
Page 165: ...157 6 5 Schematic diagram of electrical system ...