32
DIAGNOSTICS
Service Analyzer Charts
FLOODING
SYMPTOM
POSSIBLE CAUSE
REMEDY
Poor system control
using a TEV
Loose sensing bulb
Secure the bulb and insulate�
Bulb in wrong location
Relocate bulb�
Wrong size TEV
Use correct replacement�
Improper superheat setting (less than 5°F [-15°C]) Replace TEV�
THERMOSTATIC EXPANSION VALVES
SYMPTOM
POSSIBLE CAUSE
REMEDY
High Superheat, Low
Suction Pressure
(superheat over
15°F [-9°C])
Moisture freezing and blocking valve
Recover charge, install filter-drier, evacuate system,
recharge�
Dirt or foreign material blocking valve
Recover charge, install filter-drier, evacuate system,
recharge�
Low refrigerant charge
Correct the charge�
Vapor bubbles in liquid line
Remove restriction in liquid line� Correct the refrigerant
charge�
Remove noncondensible gases�
Size liquid line correctly�
Misapplication of internally equalized valve
Use correct TEV�
Plugged external equalizer line
Remove external equalizer line restriction�
Undersized TEV
Replace with correct valve�
Loss of charge from power head sensing bulb
Replace power head or complete TEV�
Charge migration from sensing bulb to power
head (Warm power head with warm, wet cloth�
Does valve operate correctly now?)
Ensure TEV is warmer than sensing bulb�
Valve feeds too much
refrigerant, with low
superheat and higher
than normal suction
pressure
Moisture causing valve to stick open�
Recover refrigerant, replace filter-drier, evacuate system,
and recharge�
Dirt or foreign material causing valve to stick
open
Recover refrigerant, replace filter drier, evacuate system,
and recharge�
TEV seat leak (a gurgling or hissing sound is
heard AT THE TEV during the off cycle, if this is
the cause)� NOT APPLICABLE TO BLEED PORT
VALVES�
Replace the TEV�
Oversized TEV
Install correct TEV�
Incorrect sensing bulb location
Install bulb with two mounting straps, in 2:00 or 4:00
position on suction line, with insulation�
Low superheat adjustment
Replace TEV�
Incorrectly installed, or restricted external
equalizer line
Remove restriction, or relocate external equalizer�
Diagnostics
Summary of Contents for ANL-AZ 13 SEER Series
Page 12: ...12 INSTALLATION Interconnecting Tubing cont Tubing...
Page 13: ...13 INSTALLATION Interconnecting Tubing cont Tubing...
Page 14: ...14 INSTALLATION Interconnecting Tubing cont Tubing...
Page 35: ...35 For Single Phase Models WIRING DIAGRAMS Wiring Diagrams...
Page 36: ...36 WIRING DIAGRAMS For Three Phase Models Wiring Diagrams...
Page 37: ...37 Wiring Diagrams APM 018 WITH ECM FAN MOTOR WIRING DIAGRAMS...
Page 38: ...38 NOTES...
Page 39: ...39 NOTES...
Page 40: ...40 NOTES...