20A-320A-3TX / TXH / TXB 180S - 400L (Rev. 4/23/07)TX / TXH / TXB 180S - 400L (Rev. 4/23/07)
2.2. CheCheck thck the cone condendenser fser for debor debris aris and clnd clean ifean if
required.required.
3.3. CheCheck all elck all electectricrical conal connecnectiotions and ensns and ensureure
that the circuit breakers are set.that the circuit breakers are set.
4.4. CheCheckicking the cong the comprmpressessor cluor clutch witch will reqll requiruiree
starting the starting the engine. engine. When 12 When 12 VDC is VDC is sentsent
from the thermostat through the binary switchfrom the thermostat through the binary switch
to the compressor, the compressor’s clutch willto the compressor, the compressor’s clutch will
pop towards the compressor pulley (this will bepop towards the compressor pulley (this will be
heard). heard). The clutch The clutch will then will then begin to rotbegin to rotateate
with the pulley (this will be seen).with the pulley (this will be seen).
5.5. Ensure Ensure that that the the evaporevaporator ator coil, coil, locatlocated ined insideside
the air conditioner / heater unit (and ceiling-the air conditioner / heater unit (and ceiling-
mounted air conditioner unit), is not iced up.mounted air conditioner unit), is not iced up.
The thermostat’s capillary should be posi-The thermostat’s capillary should be posi-
tioned in the center of the evaporator coil fins.tioned in the center of the evaporator coil fins.
If the thermostat is functioning properly whenIf the thermostat is functioning properly when
the fins ice up, the thermostat will remove thethe fins ice up, the thermostat will remove the
12 VDC to the com12 VDC to the compressorpressor. . This will This will allow theallow the
compressor pulley to free-spin and no refriger-compressor pulley to free-spin and no refriger-
ant will be circulated to the evaporator coil.ant will be circulated to the evaporator coil.
The ambient temperature will then defrost theThe ambient temperature will then defrost the
evaporator coil fins.evaporator coil fins.
6.6. The 1The 12 VDC s2 VDC signignal fral from thom the thee thermormostastat must mustt
pass through a binary switch, which monitorspass through a binary switch, which monitors
low pressure and high pressure in order tolow pressure and high pressure in order to
Air Conditioner / Air Conditioner / Heater Unit TroubleshootingHeater Unit Troubleshooting (Illustration 20A-2)(Illustration 20A-2)
PPrroobblleemm CCaauussee CCoorrrreeccttiioonn
1.1. AiAir cr conondidititiononiningg
unit does notunit does not
power uppower up
1.1. CirCircuicuit brt breakeaker(er(s) (s) (CB2CB21, C1, CB22 B22 oror
CB23) is tripped or defective.CB23) is tripped or defective.
2.2. HarHarnesness cos connennectoctor is dr is discisconnonnectecteded
or loose.or loose.
3.3. LooLoose pse pin iin in han harnerness css connonnectectoror..
4.4. BrBrokoken oen or shr shororteted wid wireres.s.
1.1. ResReset or ret or repleplace cace circircuit buit breareakerker(s)(s)..
Refer toRefer to Circuit BreakersCircuit Breakersof theof the
Component TroubleshootingComponent Troubleshootinginin
Section 6Section 6..
2.2. ConConnecnect t or or tigtightehten hn harnarnessess
connector.connector.
3.3. IsIsololatate ae and nd rerepapairir..
4.4. TTrouroublebleshoshoot, isot, isolaolate and rete and repaipairr..
2.2. FaFan bn blolows ws lilimimitetedd
or no cold airor no cold air
1.1. HeaHeater ster shuthut-of-off vf valvalve is e is opeopen.n.
2.2. ComComprepressossor clr clutcutch is h is slislippipping ong orr
defective.defective.
3.3. LoLow Fw Frereon on chcharargege..
4.4. ThTherermomoststat is dat is defefecectitiveve..
1.1. CloClose se heaheater ter shushut-ot-off ff valvalve.ve.
2.2. TTighighten dten drivrive bele belt or ret or replaplace clce clutcutch.h.
3.3. HavHave cere certiftified tied techechnicnician rian rechechargargee
air conditioning system.air conditioning system.
4.4. ReReplplacace e ththerermomoststatat..
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