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11.B.10 Oxygen Sensor
The oxygen sensor is an automotive derived sensor
which will require periodic replacement. If the sensor
fails or is out of calibration the Oxygen and Carbon
Monoxide lines on the main menu will blink red and
dashes will be displayed instead of numeric values.
Use only Laars supplied sensors as replacements and
tighten the sensor into the fitting on the heat exchanger
exhaust transition to 30 to 40 ft-lb of torque.
11.B.11 High Temperature Limits (optional)
The optional high temperature limits provide redundant
high water temperature functions utilizing discrete
temperature sensing bulb controllers. The sensing
bulbs are located in a sensing well in the outlet water
nozzle and the controllers are located above the heat
exchanger between the air inlet duct and the blower
outlet air transition. See Figure 45
Connectors are provided on the safety chain wire
harness to include these limiters in the safety chain
when provided. If this option is not included, the
connectors are jumpered together.
NOTE - The Warranty does not cover damage
caused by lack of required maintenance, lack of water
flow, or improper operating practices.
FT
HIGH LIMIT SWITCHES
Figure 45. High Temperature Limits
Page 117
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