Guardian PowerVent Training Manual SVC900; Rev 1
Page 26
HOW TO CHECK THE FLAMMABLE VAPOR SENSOR
The Flammable Vapor (FV) Sensor can operate between
32
0
F and 150
0
F with relative humidity between 10% and
95%. The sensor works by absorbing flammable vapors
(or hydrocarbons) in a passive mode. It has a normal
operating resistance value between 13k and 25k Ohms
(thousand Ohms). Any material that emits a flammable
vapor odor, such as gasoline, paint thinner, cleaning
solvents, and glues may trip the FV Sensor.
Figure 12 – Flammable Vapor Sensor Check
Table 5 – FV Sensor Values
FV Sensor Input Condition “FV Fault” input status
Normal operation Input resistance ≥13K Ohm and ≤ 25K Ohm
FV Sensor failure Input resistance ≤ 7K Ohm or ≥ 100K Ohm
CONNECTION DIAGRAM
Note: You will also find a copy of this
connection diagram on the water heater.
Figure 13 – Connection Diagram
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