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O
T
The
MNI
HERM
Condition
Condensate
Level
Outlet
Sensor
Outlet
Sensor Drift
Information
Lockout: Low Gas Pressure
•
Condensate trap water level is high
Auto-reset Condition
•
Annunciation – "Warning
•
Condensate level" on Message
screen
Outlet probe is not connected
•
•
Manual-reset Condition
Annunciation – on Navigation Bar
•
Lockout: Outlet Probe
Dual element sensor readings do
•
not agree.
Manual-reset Condition
•
Annunciation – on Navigation Bar
•
Lockout: Outlet Probe Drift
Corrective Action
•
Verify supply and manifold gas
pressures satisfy installation
requirements.
•
Check condensate trap for
proper drainage
Check condensate trap for stuck
•
level switch
Check the sensor and wiring.
•
Repair or replace as needed.
The outlet probe is a dual
•
element probe with 10K and 20K
thermistors. A quick test is to
measure resistance and verify
one resistance is double the
other. Replace if necessary.
•
Measure the resistance of each
element of the sensor and
compare to the resistance table
below. Replace if necessary.
10K
Temp
Resistance
(°F)
(Ω)
68
12555
86
8025
104
5279
122
3563
140
2463
158
1739
176
1253
194
919
212
685
Check the sensor and wiring.
•
Repair or replace as needed.
The outlet probe is a dual element
•
probe with 10K and 20K
thermistors. A quick test is to
measure resistance and verify one
resistance is double the other.
Replace if necessary.
Measure the resistance of each
•
element of the sensor and compare
to the resistance table below.
Replace if necessary.
10K
Temp
Resistance
(°F)
(Ω)
68
12555
86
8025
104
5279
Page 113
20K
Resistance
(Ω)
25099
16057
10569
7139
4937
3489
2514
1845
1376
20K
Resistance
(Ω)
25099
16057
10569
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