23
and return to 15,000 Ohms. Reversing the lead will show
the same results. If a capacitor does not act this way, it is
defective and should be replaced.
To determine if a motor is good, test the windings with
an ohmmeter. Disconnect the power supply, and turn all
the switches to the “OFF” position. Disconnect the motor
leads (on some models disconnect the 6 pin plug from
the electrical box). The motor should show continuity be-
tween all leads and the white wire. Innity or no continuity
indicates the winding is open and the motor is defective.
Check for continuity between the motor frame and each
lead. If a continuity reading is present to any lead, the
motor is shorted and defective. The motor can be tested
with an ammeter to determine if the operation is within
the rating (±10%) listed on the model plate. Many times
the motor windings will check good, but bad bearings or
capacitor may be found in an ampere test.
On Models 6204XX.XXX, 6205XX.XXX, 6206XX.XXX,
6300XX.XXX and 6305XX.XXX, the motor leads do not
go into a 6 pin connector. On these units, disconnect the
wires from the AC power module and do the previous
tests between the motor leads.
4.12 Compressor
Use an ohmmeter to check for continuity through the
overload device. If no continuity is found and the com-
pressor is hot, allow 15 to 20 minutes for the compressor
to cool. If a repeat of the test shows the overload to be
open, it is defective and requires replacement. Note on
some 15,000 BTU units the overload may be an internal
component and non replaceable.
This is an energized circuit. Shock can occur
if not tested properly. Testing is to be done
by a qualied service technician.
4.11 Blower Motor
This is an energized circuit. Shock can occur
if not tested properly. Testing is to be done
by a qualied service technician.
Be sure to disconnect all power and turn all switches to
the “OFF” position, before starting to do the tests. Remove
the terminal cover from the compressor to the three leads
connected to the terminals. Make note of the positions so
the wires can be replaced correctly. Scrape the compres-
sor casing to bare metal and check continuity from each
terminal to the casing. If continuity is found to the casing
on any of the terminals, the compressor is shorted and
it is defective. Continuity should exist between all three
terminals of the compressor. If there is no continuity the
compressor windings are open and the compressor is de-
fective.
The heater is an optional/standard component depending
on model number of AC. To diagnose the heat strip, turn
the air conditioner circuit breaker OFF. Unplug the heater
and take an ohm reading across the two wiring terminals.
You should have an ohm reading of 9.5 ohms ±10%. if the
ohm reading is outside of these parameters, replace the
heater. To check the heater limit switch, check for conti-
nuity across the limit switch terminals with the limit switch
at ambient temperature. If you have an open limit switch,
replace it. Also make sure the heater plug is properly con-
nected. The temperature rise across the heat strip should
be 5° to 7° degrees. If the temperature in the coach is 50
degrees the temp coming out of the unit will be approxi-
mately 55° to 57°. On the hand this will feel cool and the
user may not think the unit is working.
4.13 Heat Strips
This is an energized circuit. Shock can occur
if not tested properly. Testing is to be done
by a qualied service technician.
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