Specifications

52
S-1 CHECKING VOLTAGE
WARNING
1. Using a voltmeter, measure the voltage across terminals
L1 and L2 of the outlet.
2. No reading - indicates open wiring, open fuse(s), no power
or etc. from the unit to fused disconnect service. Repair
as needed.
S-3 CHECKING THERMOSTAT, WIRING AND AN-
TICIPATOR
1. Visually inspect all the wires.
2. Check wires for loose connections (tighten as needed or
replace Terminal if needed).
3. Check wires for pinched or cut wires.
WARNING
LINE VOLTAGE NOW PRESENT.
With power ON and thermostat calling for cooling.
1. Use a voltmeter to check for 24 volts at thermostat wires C
and R on the terminal strip of the control board.
2. No voltage indicates trouble in the thermostat, wiring or
external transformer source.
3. Check the continuity of the thermostat and wiring. Repair
or replace as necessary.
Floodback Protector
Opens at 30° F, Closes 60°F
Indoor Coil Thermistor
See page 53 for resistance/temperature
1. Remove front cover.
2. Remove control knobs by pulling straight up away from the
escutcheon. (Skip this step if unit has a digital board.)
3. Remove the escutcheon by lifting front of escutcheon up
and pulling top tabs from holes. (Skip this step if unit has
a digital board.)
5. Remove the two mounting screws, one on each side of the
control board cover. Tilting the control panel out, remove
the cover.
6. Disconnect the floodback protector wiring or thermistor from
the control board’s Indoor Switch terminals.
7. Remove the two screws securing the top screen to the
evaporator assembly. (Be sure to slide the top of the screen
between the top flange and chassis when reassembling.)
8. Remove the two screws securing the heater assembly to
the evaporator.
9. Pull heater assembly up and out of the chassis.
10. Disconnect floodback protector.
11. If the unit has a Red Thermistor on the indoor coil follow
steps 1-6 then steps 12 and 13.
12. Remove the access panel on the evaporator assembly.
13. The thermistor is clipped on the vertical section of the 90º
bend of the inlet line to the indoor coil. Unclip the ther-
mistor and remove.
Checking Floodback Protector Thermostat
1. With power off, remove the floodback protector thermostat
leads from the circuit board.
2. Check the floodback protector thermostat for continuity.
Below 30º ± 5ºF, the thermostat should read open. Above
60º + 6ºF, the thermostat should always read closed. Be-
tween 30 ± 5ºF and 60º ± 5ºF, the thermostat will read
open if coil temperature has been below 30º ± 5ºF and not
yet reset by going above 60º ± 5ºF. Otherwise, the ther-
mostat will read closed.
Outdoor Coil Thermistor
1. Remove chassis from wall sleeve..
2. Remove control knobs by pulling straight up away from the
escutcheon. (Skip this step if unit has digital board.)
3. Remove the escutcheon by lifting front of escutcheon up
and pulling top tabs from holes. (Skip this step if unit has
digital board.)
4. Remove the two mounting screws, one on each side of the
control board cover. Tilting the control panel out, remove
the cover.
5. Disconnect outdoor thermostat wiring from the control board
OD STAT terminal or unplug the Blue Thermistor from the
connector.
SERVICING