Chapter 9 – Maintenance
TestEquity 101H Temperature/Humidity Chamber
Page 83
Troubleshooting
SYMPTOM
CONDITION
POSSIBLE CAUSES
Chamber does
not function.
If POWER switch is ON.
a)
F4T Power button needs to be turned
ON.
b)
Limit Alarm is tripped.
Does not heat
up at all.
F4T heat PWR bar is 100%, circulator fan is
ON.
a)
Control Mode is Off instead of Auto.
b)
Heat Limiter HL is open.
c)
Heater HT1 is open.
d)
Solid State Relay SSR1 is defective.
Heats up too
slow.
If F4T Heat PWR bar is 100%.
a)
Chamber interior is overloaded.
Heat is on all
the time.
If F4T Heat PWR bar is 0%.
a)
Solid State Relay SSR1 is defective.
Does not cool at
all.
Compressor is running.
a)
Refrigerant leak.
b)
Solenoid valve SV1 is defective.
c)
Plugged capillary tube.
Compressor is not running. F4T Cool &
Compressor outputs are ON.
a)
Start relay in compressor terminal box is
defective.
b)
Compressor is defective.
Compressor is not running. F4T Cool output
is ON & Compressor output is OFF.
a)
Control Mode is Off instead of Auto.
Cools too slowly
or does not cool
down to –15°C.
Compressor is running.
a)
Room is too hot.
b)
Chamber interior is overloaded.
c)
Test sample is energized, giving off
heat.
d)
Port plug is not in port.
e)
Refrigerant leak.
f)
Capillary tube is plugged.
Temperature
varies more
than ±0.3°C or
±0.6°C total.
If tuning PID control parameters in
temperature controller were changed.
a)
Re-enter values as shipped from
TestEquity.
If tuning PID control parameters in
temperature controller are as shipped from
TestEquity.
a)
Control parameters may need to be
changed for your unique test conditions.
If tuning PID control parameters in
temperature controller are as shipped from
TestEquity and only occurs in cool mode.
a)
Control parameters may need to be
changed for your unique test conditions.
b)
Solenoid valve SV1 may be defective if
temperature varies by several degrees.
Cannot achieve
high humidity.
F4T Power and Humidity buttons are ON.
a)
No water in the reservoir (Low Water
Alarm will also be indicated).
b)
Chamber temperature is over 90°C or
under 7°C. Humidity mode will be
disabled by design.
Cannot achieve
low humidity.
F4T Power and Humidity buttons are ON.
a)
Achieving low humidity levels require
you to start with a clean, dry chamber.
b)
See page 16 for “Achievable Range of
Temperature/Humidity Conditions”.
c)
Chamber temperature is over 90°C or
under 7°C. Humidity mode will be
disabled by design.
