62-12259 7–110
07000 Economizer Temperature Sensor
• ACTIVATION: Economizer temperature sensor is out of range
• UNIT CONTROL: Engine and Electric Operation: Alarm only. Economizer forced to STANDARD mode
when alarm is active.
• RESET CONDITION: Auto reset 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, clear
the alarm(s). (Refer to Note 1 in Notes Section) 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 and connector. Verify there is no damage to sensor, and no damage, moisture, or
corrosion in connector.
b. Check sensor resistance (Refer to Note 3 in Notes Section) 10,000 Ohms @ 77°F (25°C.) See
Table 8–5 for complete table of temperatures and resistance values.
2. Check Sensor Wiring
a. Inspect connector pins and terminals at sensor and connector
1-3MSM-6 and 17
. (See wiring
schematic Section 10.) Verify there is no physical damage to harness, and no damage, moisture, or
corrosion in connectors.
b. Place the system in PC mode. Refer to Note 2 in Notes Section 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 the sensor.
07001 Economizer Press Sensor
• ACTIVATION: Economizer Pressure (ECOP) sensor is out of range.
• UNIT CONTROL: Engine and Electric: Alarm only. Economizer forced to STANDARD mode when alarm
is active.
• RESET CONDITION: Economizer Pressure 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, clear
the alarm(s). (Refer to Note 1 in Notes Section) 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 System Pressures
a. Check Unit Data. Refer to Section 3.15. Compare the pressure readings for the ECOP, the CSP and
the CDP. The ECOP should read between the CSP and the CDP, if not it indicates the ECOP has
failed. Refer to Section 8.8.11 for instruction on comparison. If discharge pressure is in normal
range, proceed to next step.
b. Place the Unit in Service mode. Refer to Section 5.2.5. After the unit has equalized, compare the
pressure readings for the ECOP, the CSP and the CDP. The ECOP the CSP and the CDP should all
read within 5 psi, if not it indicates the ECOP has failed. Refer to Section 8.8.11 for instruction on
comparison.
2. Check Economizer Pressure Sensor - Inspect sensor and connectors (1-3MSM-9, 10, and 33). Verify
there is no damage to sensor, and no damage, moisture, or corrosion in connectors.
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