6-15
T-309
1
2
3
4
5
2
1. Controller Software
Programming Port
2. Mounting Screw
3. Controller
4. Expansion Module
5. Test Points
Figure 6-18 Controller Section of the Control Box
a. Obtain a grounding wrist strap (Carrier Transicold
part number 07--00--304--00)and a static dissipation
mat (Carrier Transicold part number 07--00304--00.
The wrist strap, when properly grounded, will dissi-
pate any potential buildup on the body. The dissipa-
tion mat will provide a static-free work surface on
which to place and/or service the modules.
b. Disconnect and secure power to the unit.
c. Place strap on wrist and attach the ground end to any
exposed unpainted metal area on the refrigeration
unit frame (bolts, screws, etc.).
d. Carefully remove the module. Do not touch any of the
electrical connections if possible. Place the module
on the static mat.
e. The strap should be worn during any service work on
a module, even when it is placed on the mat.
6.21.2 Controller Trouble-Shooting
A group of test points (TP, see Figure 6-18) are provided
on the controller for trouble-shooting electrical circuits
(see schematic diagram, section 7). A description of the
test points follows:
NOTE
Use a digital voltmeter to measure ac voltage
between TP’s and ground (TP9), except for
TP8.
TP1
This test point enables the user to check if the controller
unloader solenoid valve relay (TU) is open or closed.
TP2
This test point enables the user to check if the high
pressure switch (HPS) is open or closed.
TP3
This test point enables the user to check if the water
pressure switch (WP) contact is open or closed.
TP 4
This test point enables the user to check if the internal
protector for the condenser fan motor(IP-CM) is open or
closed.
TP 5
This test point enables the user to check if the internal
protectors for the evaporator fan motors (IP-EM1 or
IP-EM2) are open or closed.
TP 6
This test point is not used in this application.
TP 7
This test point enables the user to check if the controller
economizer solenoid valve relay (TS) is open or closed
TP 8
This test point enables the user to check power to the
suction modulator valve.
TP 9
This test point is the chassis (unit frame) ground
connection.
TP 10
This test point enables the user to check if the heat
termination thermostat (HTT) contact is open or closed.
6.21.3 Controller Programming Procedure
To load new software into the module, the programming
card is inserted into the programming/software port.
CAUTION
The unit must be OFF whenever a program-
ming card is inserted or removed from the
controller programming port.
NOTE
The metal door on the programming card must
be facing to the left when inserting.
a. Procedure for loading Operational Software
1. Turn unit OFF, via start-stop switch (ST).
2. Insert the programming card for Operational Soft-
ware into the programming/software port. (See
Figure 6-18)
3. Turn unit ON, via start-stop switch (ST).
4. The Display module will alternate back and forth
between the messages “rEV XXXX” and “Press
EntR”. (If a defective card is being used the Display
will blink the message “bAd CArd”. Turn start-stop
switch OFF and remove the card.)
