AH-Passport I/O Control Operations Manual
Fault-Handling Codes
L-2232 ENGLISH
11
F
AULT
-H
ANDLING
C
ODES
One of the following fault codes displays when a fault is detected:
•
ASF
– Indicates air sensor failure.
•
FIL
– Indicates filter needs to be cleaned or replaced.
T
EMPERATURE
D
IFFERENTIAL
OF
A
IR
& W
ATER
The optional electric heater overlaps with the chilled-water heat by 22° F (12.2° C). The heater turns on when heat is required
and remains on until the chilled-water temperature exceeds the ambient by 22° F (12.2°C) or until the room temperature is
satisfied. During very cold conditions electric heat overlaps the chilled-water heat to supplement heating. Note that parameter
P-19 setting increments are in °F even when the control is set to display °C.
Figure 2: Ambient Air to Water Temperature Differentialf
IMPORTANT
The system’s air sensor is located in the control’s display panel, therefore the display MUST be located on an interior
wall at eye level. It must NOT be located in direct sunlight or inside a cabinet.
If these conditions cannot be met, you must purchase the Optional Remote Air Sensor and install it in the return-air
stream.
-15°
-7°
+7°
+15°
0°
+22°
Valve Open
Electric Heater and Valve Open
Valve Hysteresis
Valve Hysteresis
Electric Heater
Fan Only
Valve Opens
Valve Opens
Valve Closes
Valve Closes
Ambient
Heater Off
Ambient Air to Water Temperature Differential
Water Temperature
Differential (°F)
Note: Chart uses the Default Values! P-17
Note: Chart uses the Default Value for P-19.
