Wiring Diagrams - Friedrich WS08B10A-A Service & Parts Manual

Problem
Unit does not run
Problem
Evaporator coil
freezes up
Problem
Compressor runs
continually & does
not cycle off
Problem
T-stat does not turn
unit off
16
Possible Cause
Fuse blown or circuit tripped
Power cord not plugged in
System switch in "OFF" position
Inoperative system switch
Loose or disconnected wiring at
switch or other components
Possible Cause
Dirty fi lter
Restricted airfl ow
Inoperative t-stat
Short of refrigerant
Inoperative fan motor
Partially restricted capillary tube
Possible Cause
Excessive heat load
Restriction in line
Refrigerant leak
T-stat contacts stuck
T-stat incorrectly wired
Possible Cause
T-stat contacts stuck
T-stat set at coldest point
Incorrect wiring
Unit undersized for area to be
cooled
Action
Replace fuse, reset breaker. If repeats, check
fuse or breaker size. Check for shorts in unit
wiring & components
Plug it in
Set switch correctly
Test for continuity in each switch position
Check wiring & connections. Reconnect per
wiring diagram
Action
Clean as recommended in Owner's Manual
Check for dirty or obstructed coil. Use
pressure wash or biodegradable cleaning
agent to clean
Test for shorted t-stat or stuck contacts
De-ice coil & check for leak
Test fan motor & replace if inoperative
De-ice coil. Check temp. differential (delta T)
across coil. Touch test coil return bends for
same temp. Test for low running current
Action
Unit undersized. Test cooling performance &
replace with larger unit if needed
Check for partially iced coil & check
temperature split across coil
Check for oil at silver soldered connections.
Check for partially iced coil. Check split across
coil. Check for low running amperage
Check operation of t-stat. Replace if contacts
remain closed.
Refer to appropriate wiring diagram
Action
Disconnect power to unit. Remove cover
of t-stat & check if contacts are stuck. If so,
replace t-stat
Turn to higher temp. setting to see if unit
cycles off
Refer to appropriate wiring diagrams
Refer to industry standard sizing chart