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1
2
O
O
N
N
A
7.7 DIAGNOSTICS
There are 2 LEDs (green/yellow) on the standalone EXV control which indicate valve
movement. When the green LED is illuminated, the control is moving the valve in the
open direction. When the yellow LED is illuminated, the control is moving the valve in the
closed direction. When neither LED is illuminated, the valve is not being moved by the
control. In addition to the diagnostic lights on the control, it is possible to feel the coil on
the EXV pulse when the control is attempting to change the EXV position.
Status LED
Only suction temperature valid – suction pressure nor coil
1
temperature are valid
2
No Valid Suction Temperature
3
Valve near open position
4
Suction pressure out of range
7.8 EXV STANDALONE CONTROL PHYSICAL INTERFACE
FIGURE 32
EXV ENABLED COIL WIRING DIAGRAM
1
8
1. Thermostat Connection
2. Yellow LED (close)
3. Green LED (open)
4. Red LED (status)
5. Dip Switch (EXV steps, 2 & 3 SH adjust-
ment dip switch)
7.9 EXV STANDALONE CONTROL OPTIONAL MOUNTING LOCATIONS
The EXV standalone control and housing is factory installed inside the case on the tube
sheet. This location has been tested and approved for long term operation inside the
highly humid environment. In the event servicing the EXV control without opening the
coil door or to see the operational lights while the system is in operation the following
1
2
1
O
N
C
B
Board Fault
2
3
7
6. Electronic Expansion Valve Connection
7. Suction and Coil Thermistor Connection
8. Suction Pressure Transducer Connection
2
1
2
O
N
D
4
5
6
37
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