Chapter 8 – Maintenance
TestEquity 1016C-1027C Temperature Chamber
Page 8-9
Troubleshooting
SYMPTOM
CONDITION
CAUSES
Chamber completely
inoperative.
1.
Power is applied to chamber but
nothing lights up.
1.
Incorrect phase sequence.
Reverse two of the input lines.
2.
Control fuse F3 open. Likely
cause is shorted solenoid coil on
SV1 or SV2.
Does not heat up at all.
1.
If F4T upper PWR bar is 100%
(F4 controller light 1A is ON),
circulator fan is ON, circulator
fan is ON, the Heat light is
OFF.
2.
If controller light 1A is ON,
circulator fan is ON, the Heat
light is ON.
1.
Solid State Relay SSR1or SSR2
is defective.
2.
At least two Heat Limiters HL
are open.
Heats up too slow.
1.
Does not meet published
specifications.
1.
Chamber interior is overloaded.
Port plug is not in port. Verify
that input voltage is within
tolerance. One heat limiter HL
or one heater winding is open.
Heat is on all the time.
1.
If F4T upper PWR bar is 0%
(F4 controller light 1A is OFF).
1.
Solid State Relay SSR1 or
SSR2 is defective. Heater is
shorted to chassis.
Does not cool at all.
1.
If F4T upper PWR bar is 100%
(F4 controller light 1B is ON),
F4T Compressor Output (F4
DigitalOut 8) is ON, the Cool
light on front panel is OFF, both
compressors are OFF.
2.
Setpoint is low than chamber
temperature but F4T
Compressor Output (F4
DigitalOut 8) is not ON.
3.
If the Cool light is ON,
compressors are ON.
1.
Pressure switch DPS1 or DPS2
is tripped.
2.
Controller is mis-configured.
Re-enter values as documented
in the controller manual.
3.
Solenoid valve SV1 may be
defective in closed position.
Defective R-508B expansion
valve. Refrigerant leak.
R-404A pressure switch
DPS1 trips.
1.
Trips shortly after turn on.
2.
Trips after operating for a
while.
1.
Ambient temperature may be
too high. Low charge (leak).
2.
Dirty condenser, inadequate
clearance from back of chamber
to the wall. R-404A hot gas
bypass regulator may be
defective or set too low.
R-508B pressure switch
DPS2 trips.
1.
Trips when the cool light is ON
all the time.
2.
Trips when the cool light cycles
from ON to OFF.
1.
Solenoid Valve SV1 may be
defective.
2.
Solenoid valve SV2 may be
defective. Hot gas bypass
regulator may be defective or
set too low.
