TROUBLE
POSSIBLE CAUSE
TEST
REMEDY
Space temperature higher
Bad location of thermostat Carefully read
Relocate thermostat to a
than thermostat setting
temperature at the sensing place more representa-
element.
tive of average space
temperatre
Thermostat out of adjust-
Calibrate with good ther-
Clean, adjust, or replace
ment or sticking
mometer.
the thermostat
Cooling coil magnetic
Test solenoid valve for
Replace solenoid coil.
valve not opening
sticking valve
Clean valve or adjust
pilots.
Space temperature lower
Bad location of thermostat
Test with reliable ther-
Move the thermostat to a
than thermostat setting
(this will also affect
mometer at location.
better location.
cooling)
Cooling coil magnetic
valve stuck in open
position
Stuck valve.
Disassemble and clean.
Heating coil magnetic
Test solenoid.
Replace solenoid coil.
valve stuck or bad solenoid Test valve.
Clean the valve.
Thermostat or humidistat
Sensing element fouled
Examine.
Clean.
time constant too long,
with lint and dirt
causing wide deviation
from set point
Electric heater does not cut Controller contacts stuck Use test lamp to determine. Replace contacts, springs
out
or other parts as found
defective.
Electric heater does not cut Overheat protection not Place test lamp across.
in reset or defective
Repair or replace.
Figure 5-10.Trouble diagnosis chart with recommended test included.
personnel from being in or entering the space while the
refrigerant is being transferred.
l You feel light-headed.
l You feel giddy.
4. Locate an emergency self-contained breathing
apparatus for each person in the space to permit safe
evacuation in the event of a large accidental leak
5. When you suspect refrigerant may be present in
the atmosphere, leave the space immediately if:
l You smell something that is unusual.
l You experience shortness of breath.
l You feel a tingling sensation in your fingers or
toes.
l You suddenly start to feel warm.
l You experience rapid heartbeat,
5-16