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6.20.5 Battery Replacement
Standard Battery Location (Standard Cells):
a. Turn unit power OFF and disconnect power supply.
b. Slide bracket out, remove old batteries. (See
Figure 3--4, Item 8.)
c. Install new batteries, slide bracket into control box
slot.
Use care when cutting wire ties to avoid
nicking or cutting wires.
Standard Battery Location (Rechargeable Cells):
a. Turn unit power OFF and disconnect power supply.
b. Disconnect battery wire connector from control box.
c. Slide out and remove old battery and bracket. (See
Figure 3--4, Item 8.)
d. Slide new battery pack and bracket into the control
box slot.
e. Reconnect battery wire connector to control box and
replace wire ties that were removed.
Secure Battery Option (Rechargeable Cells Only):
a. Turn unit power OFF and disconnect power supply.
b. Open control box door and remove both the high volt-
age shield and clear plastic rain shield (if installed).
c. Disconnect the battery wires from the "KA" plug posi-
tions 14, 13, 11.
d. Using Driver Bit, Carrier Transicold part number
07--00418--00, remove the 4 screws securing the dis-
play module to the control box. Disconnect the ribbon
cable and set the display module aside.
The battery wires must face toward the right.
e. Remove the old battery from the bracket and clean
bracket surface. Remove the protective backing from
the new battery and assemble to the bracket. Secure
battery by inserting the wire tie from the back of the
bracket around the battery, and back through the
bracket.
f. Reconnect the ribbon cable to display and re--install
the display.
g. Route the battery wires from the battery along the dis-
play harness and connect the red battery wire and
one end of the red jumper to "KA14", the other end of
the red jumper wire to "KA11", and the black wire to
"KA13".
h. Replace wire ties that were removed.
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6.21 VENT POSITION SENSOR SERVICE
The fresh air vent position sensor alarm (AL50) will
occur if the sensor reading is not stable for 4 minutes or if
the sensor is outside of its valid range (shorted or open).
This can occur if the vent is loose or the panel is
defective. To confirm a defective panel, assure that the
wing nut is secure and then power cycle the unit. If the
alarm immediately reappears as active, the panel
should be replaced.
The alarm should immediately go inactive, check the
4-minute stability requirement. If the alarm reoccurs
after the four minutes and the panel was known to have
been stable, then the sensor should be replaced.
In order to replace the VPS, the panel must be removed
and replaced with another upper fresh air panel
equipped with VPS.
Upon installation, a new vent position sensor assembly
requires calibration as follows:
1. Rotate the vent to the 0 CMH/ CFM position.
2. Code select 45 will automatically display. Press the
Enter key and hold for 5 seconds.
3. After the enter key has been pressed the display will
read CAL (for calibration).
4. Press the ALT MODE key and hold for five seconds.
5. After the calibration has been completed, Code 45
will display 0 CMH / CFM.
6.22 TEMPERATURE SENSOR SERVICE
Procedures for service of the Return Recorder, Return
Temperature, Supply Recorder, Supply Temperature,
Ambient, Defrost Temperature, Compressor Discharge
and Compressor Suction temperature sensors are
provided in the following sub paragraphs.
6.22.1 Sensor Checkout Procedure
To check a sensor reading, do the following:
a. Remove the sensor and place in a 0C (32F) ice-water
bath. The ice-water bath is prepared by filling an insu-
lated container (of sufficient size to completely
immerse bulb) with ice cubes or chipped ice, then fill-
ing voids between ice with water and agitating until
mixture reaches 0C (32F) measured on a laboratory
thermometer.
b. Start unit and check sensor reading on the control
panel. The reading should be 0C (32F). If the reading
is correct, reinstall sensor; if it is not, continue with the
following.
c. Turn unit OFF and disconnect power supply.
d. Refer to paragraph 6.20 and remove controller to gain
access to the sensor plugs.
6--21
T-334
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