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6-25
T--317
pen tip (item 4). Exert pull on the gage 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.
6.24.4Rezeroing 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 6-27)
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.
For Electronic Partlow Recorder CTD P/N
12-00464-xx
Where xx= an even number (example: 12--00464--08)
NOTE
Use chart CTD P/N 09-00128-00 (
°
F)
P/N 09-00128-01 (
°
C).
a. Press the “Calibration” button (item 7, Figure 6-27)
on the bottom of the recorder. The pen tip will drive
fully down scale, then move upscale to the chart ring
at 0
°
C (32
°
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.
d. Choose rivet locations and drill the rivet holes in the
corresponding locations on the control box and patch
piece.
e. Apply the adhesive sealant around the damaged area
to form a seal between the control box and the patch
piece.
f. Rivet the patch piece in place.
g. File smooth any rough edges (including rivets) that
may come into contact with wires.
6.25 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, apply 2--part epoxy
paint to the area. and allow to dry. After the first coat
dries, apply a second coat.
6.26 COMPOSITE CONTROL BOX REPAIRS
6.26.1 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.
6.26.2 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 6-2).
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)
overlap 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.
e. Remove the tape and overlap the edge of the cloth
approximately 6 to 12 mm (1/4” to 1/2”) with glue.
f. Epoxy will dry in 45--60 minutes. When completely
cured (12 hours), use sandpaper to smooth edges of
the patch.
6.26.3 Chips And Holes
Chips and holes in the control box are repaired using a
piece of aluminum or stainless steel to cover the
damaged area. The material can be cut to suit and
riveted in place. An adhesive sealant must be used to
make the repair watertight. The adhesive sealant
(Sikaflex 221) is included in Crack Repair Kit Carrier