Manual 2100-742A
Page
46 of 54
Problem
Probable Cause
Troubleshoot
The green LED is not lit.
Controller not receiving 24VAC signal.
Control Board
The green LED is lit, but superheat is not
being maintained.
The relay is not closing the controller’s DI
connection to ground.
Relay
The red LED is flashing and EEV is not controlling superheat properly (13º superheat). One of the following is likely the fault:
1. Low superheat is detected and the
controller is taking steps to protect the
system by closing the valve.
Stator is broken or connected incorrectly.
Stator
Valve is stuck open.
EEV Valve
2. Suction temperature sensor error.
Poor connection of sensor or faulty sensor.
Thermistor
3. Suction pressure transducer error.
Pressure transducer wiring incorrect or faulty
transducer.
Transducer
The red LED is on steady.
The operating parameters have been damaged.
Replace Control Board
TABLE 16
Electronic Expansion Valve Troubleshooting
The electronic expansion valve moves to a closed
position when there is no call to control. In order to
pull a complete vacuum, fully reclaim the system or
charge the unit, connections to the suction and liquid
line service ports need to be utilized or the valve needs
to be manually opened first. The valve can be opened
manually using the magnetic EEV service tool (Bard
P/N 2151-021) shown in Figure 30. To do this, remove
the EEV stator coil (red color with retaining nut on top),
slide the magnetic tool over the shaft where the stator
was removed and turn in a clockwise direction to open
the valve to the full open position (directional arrows
are provided on the tool).
FIGURE 30
Electronic Expansion Valve (EEV) and Service Tool
EEV Service
Tool
EEV Stator
Coil
EEV
The high side connection should be made at the service
port located on the liquid line assembly near the unit
base on the right side of the unit (see Figure 31).
FIGURE 31
High Side Connection
MIS-4214
FILTER DRIER
CONNECT GAUGE LINE
TO THIS SERVICE PORT
Connect gauge line
to this service port
MIS-4214
Filter Drier
Reapply the EEV stator coil and retaining nut once
complete. Upon powering the unit back up, the control
board will automatically drive the EEV back to the fully
shut position. Once the compressor starts, the control
board will again modulate the EEV position to control
the system superheat.
Troubleshooting the Electronic Expansion Valve
The control board has two status LEDs.
• The green LED should be lit anytime that the board
has power and the control is functioning.
• The red LED is to show that an alarm is present.
See Table 16 for a guide to know where to start
troubleshooting the EEV. Refer to the appropriate unit
replacement parts manual for any parts that are needed.
Содержание 11EER QH Series
Страница 16: ...Manual 2100 742A Page 16 of 54 MIS 2471 A REMOVE KNOCK OUT FOR INDOOR DRAIN HOSE CONNECTOR FIGURE 18C If used ...
Страница 43: ...Manual 2100 742A Page 43 of 54 GRAPH 1 Q24H4 FAD Ventilation Delivery GRAPH 2 Q30H4 FAD Ventilation Delivery ...
Страница 44: ...Manual 2100 742A Page 44 of 54 GRAPH 3 Q36H4 FAD Ventilation Delivery ...