FIELD (UNIT) MAINTENANCE
LARGE CAPACITY FIELD HEATER
CARBON MONOXIDE DETECTOR OPERATOR CONTROL BOX
INSPECT, TEST, REPLACE
Tool Kit, General Mechanics (Item 2, WP 0092
MOS 63J or 52C
Heater powered up and operational for TEST
Heater shut down and cool for REPLACE
Main battery switch OFF and handle removed
except for TEST
The operator control box mounted carbon monoxide detector must be replaced every 5
years regardless of the results of inspection or test. Refer to the section of this work
package entitled REPLACE for complete details on replacement.
Inspect the carbon monoxide detector and cover assembly (1) and ensure that it has not been damaged
in any way. Ensure that the louvers (2) are not blocked or damaged in such a way as to prevent proper
airflow into the detector. Ensure that the hinged outer cover (3) operates properly. Ensure that the
indicator lamp (4) is not broken or missing. If the carbon monoxide detector is damaged, replace
To test the carbon monoxide detector (1), turn the heater on IAW WP 0005 00. The heater will go through
a self test. If a fault is detected with the carbon monoxide detector in the operator control box, a fault code
of either H331 or H332 will be displayer on the operator control panel display. Replace a defective carbon
monoxide detector as detailed in the section of this work package entitled REPLACE.
1. Remove four screws (5) and set aside. Lift the carbon monoxide detector and cover assembly (1)
from the operator control box (6) taking care not to damage the wires.
2. Remove cover (7) by removing four screws (8).
3. Tag and mark the three wires (9, 10, and 11) that connect to the CO detector terminal strip.
4. Loosen the three screws (12) on the terminal strip and remove the three wires (9, 10, and 11).