6
−
25
T
−
318
c.Adjust the gear wheel counter clockwise until the
meter reads
6.5k ohms
(approximately).
d. Install the VPS slide door so that the door is flush
against the bottom rail, the motor gear and the door
teeth are meshed, and the gear wheel does not
move from the set position.
12.Position slide assembly back on to studs and re-
install two washers and two nuts that secure slide
assembly.
13.Stake the ends of the two studs on panel assembly
with wire cutters so that nuts will not be easily re-
moved.
14.Reinstall Partlow box assembly if equipped, or ac-
cess panel.
15.Reinstall condenser fan guard.
6.26 eAutoFresh SERVICE
6.26.1 Servicing the eAutoFresh Air Filter
Removing the Air Sample Filter Element
The air sample filter element can be accessed in two
ways:
1. Through the eAutoFresh side evaporator access
panel (see Figure 2-2).
2. Through the inside of the container by lowering the
upper evaporator panel.
a. By hand, unscrew and remove the filter cup from the
bottom of the air sample filter assembly.
b. Remove the filter element from the filter assembly.
c. Install the new air sample filter element by reversing
the above steps.
6.26.2 Checking eAutoFresh Drive System
Checking the Auto Slide:
a. To check with an ohmmeter, disconnect the four pin
connector to the stepper motor. With a reliable digital
ohmmeter, check the winding resistance. In normal
ambient, the motor should have 72 to 84 ohms meas-
ured on the red/green (a
−
b terminals) and on the
white/black (c
−
d terminals) leads. If an infinite or zero
reading occurs, check connections or replace the mo-
tor. If near normal or normal reading occurs, proceed
to Checking the Controller.
b. To check with a SMA
−
12 portable stepper drive test-
er. The SMA
−
12 portable stepper drive tester (Carrier
Transicold P/N 07
−
00375
−
00) is a battery operated
stepper drive which will open and close the auto slide,
which allows a more thorough check of the motor.
Checking the Slide Motor:
a. Turn unit OFF.
b. Disconnect the four pin connector from the Stepper
Drive to the Stepper Motor, (see Figure 6-23).
c. Attach the SMA
−
12 portable stepper drive tester to
the Stepper Motor.
Stepper Drive (SD)
Stepper Motor (AF)
Figure 6-30 Stepper Components
d. Set the SMA
−
12 pulse per second (PPS) to one PPS
and press button to open or close the valve. Each
LED should light sequentially until all four are lit. If an
LED fails to light, it indicates an open on that leg
caused by a poor connection or an open coil. Repair
or replace as required to achieve proper operation.
e. Set the SMA
−
12 step rate to 200 PPS. Press open or
close while watching the slide mechanism for move-
ment, this is an indication that the motor is working.
f. If the slide moves using the SMA
−
12, but fails to
move when connected in the unit (refer to “Checking
the Drive Module” in the section that follows.)
Checking the Drive Module:
a. Turn unit OFF.
b. Disconnect the four pin connector to the Stepper Mo-
tor.
c. With a voltmeter set to read 24 volts AC, attach the
positive lead to the drive module outlet pin A (wire 1A)
of the four pin connector and the negative lead to the
B pin (wire 1B).
d. Turn ON unit, and watch the volt meter. After a short
delay, the reading should rise to approximately 12
volts.
e. Repeat for pins C and D (wires 2A and 2B).
f. If only one set of pins reads a voltage, check connec-
tions and retest.
g. If the retest reads out the same, the drive module or
controller is faulty.
h. If no voltage is present in any step, the output from the
controller to the drive module may be faulty. Check
the connections and wires from the controller to the
drive module.
i. To replace the drive module, disconnect all connect-
ors, unscrew from mounting, and replace with a NEW
drive module in reverse order.
Содержание 69NT40-541-300
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Страница 131: ...7 3 T 318 Based on Drawing 62 66058 Figure 7 2 SCHEMATIC DIAGRAM Units with 3 Phase Evaporator Motors...
Страница 133: ...7 5 T 318 6 Heater FCCH FCCH Figure 7 4 SCHEMATIC DIAGRAM Units with Normal Evaporator Fan Capability...
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Страница 138: ...7 10 T 318 Based on Drawing 62 66058 Figure 7 9 UNIT WIRING DIAGRAM Units with 3 Phase Evaporator Motors Sheet 1 of 2...
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