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62-11637
7–46
00131
CHECK EVAP TEMP SENSOR
• ACTIVATION: Evaporator Outlet Temperature Sensor (EVOT) is not within the range of
−
53 to +158°F
(
−
47 to +70°C)
• UNIT CONTROL: Alarm only and superheat for EVXV will be calculated using SAT or DTT if alarm 00123
(Check Supply Air Sensor) is active.
• RESET CONDITION: Auto reset when Evap Temp Sensor is in range or, alarm may be manually reset
using the display mounted keys or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (refer to reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1.
Check Sensor
a. Inspect sensor & connector. Verify there is no damage to sensor, and no damage, moisture, or cor-
rosion in connector.
b. Check Evap Temp Sensor resistance. (Refer to Note 3 in
Section, page 7-2.) 10,000 Ohms
@ 77°F (25°C.) See
for complete table of temperatures and resistance values.
2.
Check Sensor Wiring
a. Inspect connector pins & terminals at sensor and connector 2MM. (See wiring schematic
.) Verify there is no physical damage to harness, and no damage, moisture, or corrosion in con-
nectors.
b. Place the system in PC Mode. Refer to Note 2 in
Section, page 7-2. Disconnect sensor from
harness. Check for 3.0 ± 0.1 VDC volts at harness plug between pins. This verifies microprocessor
output and wiring connections to sensor.
Содержание Transicold X4 7300
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