TestEquity 1007C - Troubleshooting

Chapter 9 – Maintenance
TestEquity 1007C Temperature Chamber Page 9-9
Troubleshooting
SYMPTOM
CONDITION
CAUSES
Chamber completely
inoperative.
1. Power is applied to chamber but
the controllers do not light up.
1. Control fuse F9 open. Likely
cause is solenoid coil SV1 is
shorted.
Does not heat up at all.
1. If controller light 1A 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 SSR1 is
defective (open).
2. The Heat Limiter HL is open.
The Heater HT1 is open.
Heats up too slow.
1. Does not meet published
specifications.
1. Chamber interior is overloaded.
Circulator motor is not turning.
Port plug is not in port. Verify
that input voltage is within
tolerance and matches the input
power configuration (see
Chapter 2, Input Power
Configuration).
Heat is on all the time.
1. If temperature controller light
1A is OFF, the Heat light is ON.
1. Solid State Relay SSR1 is
defective (shorted). Heater is
shorted to chassis.
Does not cool at all.
1. If temperature controller light
1B is ON, the Cool light is OFF,
both compressors are OFF.
2. If temperature controller light
1B is ON, the Cool light is ON,
both compressors are ON.
1. Pressure switch DPS1 or DPS2
is tripped.
2. Solenoid valve SV1 may be
defective in closed position.
R-404A pressure switch
DPS1 trips. (pressure switch
on the rear right side)
1. Trips after operating for a while.
2. Trips immediately after turn on.
1. Ambient temperature may be
too high (over 90°F). Dirty
condenser, inadequate clearance
from back of chamber to the
wall.
2. Low charge (leak).
R-508B pressure switch
DPS2 trips. (pressure switch
on the rear left side)
1. Trips during any cooling mode.
2. Trips when the cool light cycles
to OFF.
1. Moisture or debris in the
refrigeration system.
2. Hot gas bypass regulator may
be defective or set too low.