Troubleshooting Guide For Lockout Conditions - Econar GeoSource 2000 GW Series Installation And Operating Instructions Manual

XIV. 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. c-Note
-
A
lockout condition
is
a result
of
the
heat
pump shutting
itself off to protect itself,
never
blpass
the
lockout
circuit. Serious damage can be
caused
by
the
system
operating
without lockout protection.
off off off
removed. fuse
AC power applied
off
x
x
on
for 4' 35"
on
AC power applied
Power applied - unit running or
waiting for
a
call to run.
x
AC power
applied
x
to
130 seconds
after
shutdown.
x
Run cycle
complete
-
before
Y
1
x
OI
call
-Check
if Low
Pressure
switch
open.
between
Low
Pressure -Check
-Lossflack of
flow
through
ground-side heat exchanger.
-I-ow
fluid temperature operation
in
ground-side heat exchanger.
-Freezing
fluid in
ground-side heat exchanger
(lack of antifreeze)'
-Dirty (fouled) ground-side heat exchanger (on
ground
water systems).
-I-ow ambient
temperatue
at
the heat pump.
-Undercharged
/ overcharged
refrigerant circuit.
-Expansion valve
/
sensing
bulb malfunction.
-Excessive
low fluid
temperature
in
the
hydronic-side heat exchangqr.
X
x x
Heating - during
Y1
call
-I-ow
fluid
temperature
in the hydronic loop.
-Freezing
fluid in
the
hydronic heat exchanger
(lack
of
antifreeze).
-Low
ambient
temperatue
at
the heat pump.
-Undercharged
/
overcharged
refrigerant circuit.
-Expansion vaive
/ sensilg bulb ma"lfunction.
- during
Y1 call
and
Controller.
x x
FIash
-Loss/iack
hydronic heat exchanger
in
the iow
fluid
switch is
open.
electdcal
connections between
Heating or
Cooling
-
before
call
x
fluid
temperature
in the
hydronic
1oop.
of
flow heat exchanger.
refrigerant circuit.
valve
/
X
x
Heating
- during
Y1
call
x
X
x
High
fluid
temperature
in the ground-side heat exchanger
-Drty
(fouled) ground-side heat exchanger
(on ground
water systems).
-Overcharged
refrigerant circuit.
through the ground-side heat exchanger.
bulb malfunction.
Cooling - during
Y1
call
18
II\
CONDTTISN
1r? COMMENTS
Flash
X
x
-Check
-Check