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XV.
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.
XVI.
ADDITIONAL
FIGURES AND TABLES
Hanger
Assembly
-z
Note:
Conceptual drawing
only-
please
foI1ow
direct.iohs included
with
hanger
assembly
kj.t for
proper
installat-ion.
Figure
7
-Hot'rzontal Unit
Hanging
Bracket
22
High
Pressure
(Head)
(Condenser/Air Side)
-Loss/lack
of
affiow
through air
coil
(dirty
air
filter,
closed
vents,
blower,
restricted
ductwork,
etc.)
:High
air temperature entering
heat
pump
-Dirty
(fouled)
air
coil
-Extremely high
water temperature to
the
evaporator, raising
compressor capacity
and
overloading
condenser
-Loss/lack
of
flow
through
hydronic
heat
exchanger
-High
fluid
temperature operation
in
the
hydronic loop
-Overcharged refrigerant
circuit
Heating
Low
Pressure
(Suction)
(Evaporator/Earth
Coupled Side)
-Loss/lack
of
flow
through earth coupled
coil
-Low
fluid
temperature operation
in
the
earth
loop
-Freezing
fluid
in
heat
exchanger (lack
of
antifreeze)
-Undercharged,/overcharged
refrigerant
circuit
-Expansion valve/sensing
bulb malfunction
-Low
fluid
tempgr4ture operation
in
the
hydronic loop
High
Pressure
(Head)
(Condenser/Earth
Coupled Side)
-l,ossflack
of
water
flow
in
earth
loop
-High
fluid
temperature operation
in
the earth
loop
-Dirty
(fouled)
condenser
coil
-Overcharged
refri gerant
circuit
Cooling
Low
Pressure
(Suction)
(Evaporator/Air
Side)
-I-oss/lack
of
airflow
through air
coil
(dirty
filter,
closed
vents,
blower, restricted
ductwork,
etc.)
-Low
air temperature entering
the heat
pump (thermostat setpoint
too
low,
etc.)
-Air coil
freezing up
(low airflow,
lack
of
charge,
etc.)
-Undercharged/overcharged refrigerant
circuit
-Expansion valvelsensing
bulb malfunction
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