Hl Discharge
pressure
too high
Condenser
abnormally hot.
Presence of uncondensable liquids in
system, or
excess refrigerant.
Purge
uncondensable
fluids
and
drain off
excess
refrigerant.
Chilled
water leaving
temperature too high. Overload
on
cooling
system.
Reduce
loard
on system.
Reduce
water
flow
if necessary.
Condenser
air
output
too hot.
Feduced air flow.
Air
intake
temperature
higher than
specified
for
unit.
Clean
coil.
Check
operation
of
motor
ventilators.
ll
Discharge
pressure
too low
Bubbles in sightglass
Lack of refrigerant.
Repair
the
leak
and
top
up
the refrigerant.
Jl Suction
pressurê
too
high
Compressor operates continuously.
Excess cooling
demand on evaporator.
Check
system.
Suction duct abnormally
cold.
Befrigerant flows back to compressor.
a)
Expansion valve
too far open.
b) Expansion
valve locked in open
a) Check for
superheat
and
check
that
expansion
valve
bulb is
secure.
position.
b) Replace.
.i
K) Suction
pressure
too low
Bubbles in
sightglass
Not enough
refrigerant.
Repair
leak
and
top up refrigerant.
Excessive
pressure
drops
through
drier filter. Refrigerant
does
not flow
through thermostatic expansion
valve.
Drier filter
clogged.
Expansion
valve
bulb
has
lost
its
refrigerant.
Replace
thr:
dehydrator.
Replace
the bulb.
Loss of
power.
Expansion
valve
obstructed.
Replace.
Superheat too
low.
Excessive
pressure
drops through
evaporator.
Check
adjustment
of superheat
and
adjust
thermostatic
expansion
valve.
Low
pressure
drops
through evaporator.
Low water
flow
rate.
Check water
flow
rate.
Check
state of fitters,
check
for
obstruction
in
chilled
water
pipes
Check
pressure
switch
contact
in water.
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