Econar GeoSurce Vara 2 Plus GV Series Lnstallation And Operating Lnstructions page 16

X[I.
TROUBLESHOOTING GUIDE FOR LOCKOUT CONDITIONS
If
the heat
pump goes
into lockout
on
a
high or low pressure switch, the cause
of the
lockout
can be
narrowed down
by
knowing
the
operating mode
and
which pressure switch the
unit locked out
on.
The
following
table
will
help track down the
problem once this
information is
known.
Note:
A lockout condition is
a
result of
the heat
pump shutting
itself off to protect
itself,
never bypass the
lockout
circuit.
Serious damage can be caused by the system operating
without lockout protection.
)
l
I
High
Pressure
(Condenser,
Air Coil
Side)
-Loss/lack of
airflow (dirty filter,
closed vents,
blower,
restricted
ductwork, etc.)
-High return air temperatures (above
85T)
-Dirty (fouled)
air
coil
-System overcharged with refrigerant
-t
oss/lack
of flow through earth coupled
coil
-Low
fluid
temperature operation
in
the earth
loop
-Freezing
fluid in
heat
exchanger (lack of
antifreeze)
-Cold return air temperature
(below
55oF)
-Expalsion valve/sensing
bulb malfunction
-Undercharged/overcharged refrigerant
circuit
Heating
[,ow
Pressure
(Evaporator, Earth Coupled Water
Coil
Side)
-Loss/lack of water
flow in
earth
loop
-High fluid
temperature operation
in
the earth
loop
-Dirty (fouled)
condenser
coil
-System overcharged with refrigerant
High
Pressure
(Condenser, Earth Coupled Water
Coil
Side)
-Loss/lack
of airflow
(dirry filter,
closed vents,
blower,
restricted
ductwork, etc.)
-Low retum
air temperature (below 55"F)
-Freezing air
coil (low airflow,
lack
of
charge, etc.)
-Undercharged/overcharged refrigerant
circuit
-Expansion valve/sensing bulb malfunction
Cooling
Low
Pressure
(Anti-Short Cycle)
(Evaporator,
Air Coil
Side)
t4
MODE
LOCXOUT CONDI?ION
PCISSBL.oCAUSE