Chapter 9 – Maintenance
Page 9-10 TestEquity 1007C Temperature Chamber
R-508B standby pressure is
less than 90-100 PSIG
1. When unit is off and system is
equalized.
bubbles or does not look full.
1. During all running conditions.
2. Only when cool light is cycling.
2. No problem. This is normal.
Cools too slowly or does not
reach –73°C.
1. R-508B standby is ok, no
bubbles in R-404A sightglass.
1. Chamber interior is overloaded.
Test sample is energized, giving
off heat. Circulator motor is not
turning. Port plug is not in port.
Door is not sealing completely.
than ±0.5°C or 1°C total.
1. If tuning PID control parameters
in temperature controller were
changed.
2. If tuning PID control parameters
in temperature controller are as
shipped from TestEquity.
3. If tuning PID control parameters
in temperature controller are as
shipped from TestEquity and
only occurs in cool mode.
1. Re-enter values as shipped from
TestEquity.
2. Control parameters may need to
be changed for your unique test
conditions.
3. Solenoid valve SV1 may be
defective.
Compressors turn on and off
too frequently.
parameters in temperature
controller were changed.
2. If compressor control
parameters in temperature
controller are as shipped from
1. Re-enter values as shipped from
TestEquity.
2. Solenoid valve SV1 may be
defective.
vibration when the
high-stage compressor
starts.
1. Chamber has been off for
several hours or more and is not
connected to source of power,
or main disconnect switch is off
during that time.
2. Chamber has been off for
several hours or more, and is
connected to source of power
and main disconnect switch is
1. The chamber must be connected
to the power source AND the
main disconnect switch must be
on for 3 hours prior to operating
the chamber.
2. R-404A crankcase heater
defective (open).
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