Econar GeoSource Invision 3 Q Series Installation And Operating Instructions Manual page 19

XII. TROUBLESHOOTING GUIDE FOR LOCKOUT CONDITIONS
Ifthe
heat
pump goes into lockout on
a
high or
low
pressure switch, the cause
ofthe
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
itseli
never bypass the
lockout
circuit.
Serious damage can be caused by the system
operating without lockout protection.
X[I.
TROUBLESHOOTING GUIDE FOR UNIT OPERATION
High Pressure
(Condenser,
Air Coil
Side)
-Loss/lack of airflow
-High return
air temperatures (above
85iF)
-Dirty
(fouled)
condenser
coil
-Overcharged refri gerant circuit
Heating
Low Pressure
(Evaporator, Earth Coupled Water Coil
Side)
-Loss/lack of
flow
through earth coupled
coil
-Low fluid
temperatue operation in the earth loop
-Freezing
fluid
in heat exchanger
(lack of
antifreeze)
-Undercharged/overcharged refrigerant
cilcuit
-Expansion valve/sensing bulb malfunction
High
Pressure
(Double Walled
Condenser
Coil
Side)
-DHWpump
out
-DHW
external piping
too
restrictive
-Water
temperature control maHunctioning
-Diny (fouled)
condenser
coil
-Entering
earth loop ternperatures to high (above
80iF)
-Overcharged
refrigerant circuit
DHW
[.ow Pressure (Evaporator, Earth Coupled
Warer Coil
Side)
-Loss/lack offlow
through earth coupled coil
-Low fluid
temperature operation in
the earth
loop
-Freezing fluid in
heat
exchanger
(lack of antifieeze)
-Undercharged/overcharged
refrigerant circuit
-Expansion valve/sensing
bulb malfunction
High
Pressure
(Condenser, Earth Coupled Water
Coil
Side)
-High fluid
temperatue
operation in
the earth loop
-Dirty (fouled)
condenser coil
of -Loss/lack
water
earth loop
water
return
-High
I
(above temperatures
lsT)
Cooling
Low
Pressure
(Anti-Shon Cycle)
(Evaporator,
Air Coil
Side) -Low
air temperature
(below
55T)
-Freezing condensation on air
coil
-Undercharged/overcharged refri gerant
circ
uit
of airflow
bulb malfunction
Blown
Circuit
breaker.)
fuse or reset circuit
breaker. (Check
for
correct
size fuse
or
Blown
Fuse on
fuse
on
correct size
or
wlres
Low
Voltage
power company.
Supply
below
196
plate,
contacl
If
1S
below mmlmum
voltage
on
voltage
will
Low
Circuit
Check
for bumout
18
volts. less
Thermostat
on
thermostat
lowest
and temperature
for wait setting,
unit and
run.
Set thermostat
on
"Heat"
and temperature
highest
wait
for setting,
timeout
and
should
unit
period
run.
unit
If
does not
1n
flJn both
the
cases,
thermostat
be
could
wired
be
or
incorrectly
To
faulty
prove
or
faulty
miswired
disconnect
thermostat.
wires thermostat
at the
and
unit
between
jumper
,'R,
and
,Y,
U
terminals
and unit
should run.
thermostat with
Replace
correct heat
thermostat
pump
A only
substitute
not work
Entire unit
does not run.
Power
filter,
if
found
or
Thermostat
set Is
it
below room
lncorrect
Check for
Blower motor
Check
off
on
one of the
compressor will
go
switch If
it
does not operate
blower motor
Unit
will
not
operate on
"heating"
DHW
leaving
water
too
Heat
pump
is
trying
clean coil.
to heat hot water
to
too hot
of
a
temperaturg.
Increase flow
,
reduce temperature,
t7
1t4O9E
LOCKOUTCGIBITTON PO,SSIRT,N{AT]SE
PROBI,EM
CAilSE
3
Broken or
Loose
Wires
Pryffi
Defecrive
thermostat
I