Carrier 69NT40-541-300, Операция и обслуживание, Страница: 118 / 152

6 − 30 T − 318
6.27.3Adjusting the Recorder Stylus
Proper stylus force upon the chart paper is important.
Factory adjustment is 113 to 127 grams (4 to 4.5
ounces). To measure the force, use a spring type gauge
and attach it under the stylus as close as possible to the
pen tip (item 4). Exert pull on the gauge perpendicular to
the chart surface. The measured force should be noted
just as the pen tip leaves the surface.
NOTE
The two coil springs near the base of the stylus
are NOT involved in establishing chart contact
force. They serve only to hold the stylus in its
retracted position.
Correct adjustment is made by carefully bending the
portion of the stylus arm between the bend near the pen
tip and the first bend towards the stylus arm base. If the
force is too low, the stylus trace will be light and difficult
to read. If the force is too great, wrinkling or tearing of the
paper chart may occur.
6.27.4Rezeroing the Recording Thermometer
For Electronic Partlow Recorder
CTD P/N 12-00464-xx
Where xx= an even number (example:
12-00464-06)
NOTE
Use chart CTD P/N 09-00128-00 ( ° F)
P/N 09-00128-01 (
°
C).
a. Press the “Calibration” button (item 7, Figure 6-33)
on the bottom of the recorder. The pen tip will drive
fully down scale, then move upscale to the chart ring
at 0 degrees C (32 degrees F), and stop.
b. If the tip of the pen (item 4) is on the 0 ° C (32 ° F) chart
ring the recorder is in calibration, proceed to step c.
If the tip of the pen is NOT on the 0 ° C (32 ° F) chart
ring, the operator must loosen the two screws on the
bottom of the stylus arm to adjust the pen tip
manually to the 0 ° C (32 ° F) chart ring. Tighten the
screws when adjustment is complete.
c. Press the calibration button and the pen will position
itself to the correct temperature reading.
6.27.5Rezeroing the Recording Thermometer
For Electronic Partlow Recorder CTD P/N
12-00464-xx, where xx = an odd number
(example: 12-00464-03)
NOTE
Use chart CTD P/N 09-00128-00 ( ° F)
P/N 09-00128-01 ( ° C).
a. Press the “Calibration” button (item 7, Figure 6-33)
on the bottom of the recorder. The pen tip will drive
fully down scale, then move upscale to the chart ring
at -29 ° C (-20 ° F), and stop.
b. If the tip of the pen (item 4) is on the -29 ° C (-20 ° F)
chart ring, the recorder is in calibration, proceed to
step c. If the tip of the pen is NOT on the -29 ° C (-20 ° F)
chart ring, the operator must loosen the two screws
on the bottom of the stylus arm to adjust the pen tip
manually to the -29 ° C (-20 ° F) chart ring. Tighten the
screws when adjustment is complete.
c. Press the calibration button and the pen will position
itself to the correct temperature reading.
6.28 MAINTENANCE OF PAINTED SURFACES
The refrigeration unit is protected by a special paint
system against the corrosive atmosphere in which it
normally operates. However, should the paint system
be damaged, the base metal can corrode. In order to
protect the refrigeration unit from the highly corrosive
sea atmosphere or if the protective paint system is
scratched or damaged, clean area to bare metal using a
wire brush, emery paper, or equivalent cleaning
method. Immediately following cleaning, spray or brush
on zinc-rich primer. After the primer has dried, spray or
brush on finish coat of paint to match original unit color.
6.29 COMPOSITE CONTROL BOX REPAIRS
6.29.1 Introduction
This procedure provides instructions for repair of the
Carrier Transicold composite control box. Damage to
the control box may be in the form of a chip or hole, a
crack, a damaged thread insert or damage to the door
hinge inserts. Generally, the object of the repair must be
to ensure sufficient strength is restored to the damaged
area and the repair must keep the box water tight.
Information on repair kits and repair procedures for each
type of damage is provided in the following paragraphs.
Ambient temperature must be above 7 ° C, (45 ° F) for
proper curing of epoxy repairs.
6.29.2 Cracks
Cracks in the control box are repaired using a fiberglass
patch over the damaged area. Materials required are
included in the Fiberglass Patch Kit supplied with Crack
Repair Kit, Carrier Transicold part number
76-00724-00SV (see Table 6-3).
a. The surface must be clean and dry. Roughen the sur-
face with sandpaper to ensure a good bond.
b. Cut the fiberglass cloth to allow a 25mm (1 inch) over-
lap around the area to be repaired.
c. Stretch and position the cloth over the area to be re-
paired and secure it with masking tape.
d. Make up sufficient epoxy glue to cover the cloth by
mixing equal parts of resin and hardener. Saturate the
cloth with the epoxy glue, spreading evenly.