Thermo King CRR-40 119, Manual

Page: 52 / 170

MP-3000a Controller
52
Text Input Example: To enter THERMO in
an information screen:
a. Enter “T” by pressing F3 key, then
pressing STU key.
b. Enter “H” by pressing GHI key.
c. Enter “E” by pressing DEF key.
d. Enter “R” by pressing F4 key, then
pressing PQR key.
e. Enter “M” by pressing F2 key, then
pressing MNO key.
f. Enter “O” by pressing F4 key, then
pressing MNO key.
b. Menu Scrolling: General text keys F1, F2, F3
and F4 also include directional arrows for entering
and scrolling through the controller Main Menu:
• F1 key: ESC indicates that pressing the K1
key moves the cursor out of (exits) a menu
list.
• F2 key: FORWARD/UP ARROWS
indicate that pressing the K2 key scrolls
the cursor forward and/or upward through
text boxes and menu lists.
• F3 key: BACKWARD/DOWN ARROWS
indicate that pressing the K3 key scrolls
the cursor backward and/or downward
through text boxes and menu lists.
• F4 key: ENTER ARROW indicates that
pressing the K4 key moves the cursor into
the next menu level or into a menu item
text box.
4. Four special function keys (see illustration on
page 4-1):
• C/F key: Press to view alternate
temperature scale in LED display.
• DEFROST key: Press to initiate defrost.
Evaporator coil temperature must be
below 10 C (50 F).
• SUP/RET key: Press to view alternate
return/supply sensor temperature in LED
display.
• SETPOINT key: Press to enter Setpoint
Menu. The first line of the Setpoint Menu
is the setpoint temperature. Press F2 or F3
key to scroll up or down through the menu
list.
NOTE: Press the “5” key to increase the
display time of the current LCD data screen
by 5 minutes. Maximum display time is 30
minutes for data screens and 100 minutes for
manual tests.
5. Status indicator LEDs (see “Status Indicator
LEDs and Alarm Codes” in this chapter).
6. Control Transformer: Low voltage control
power and ground is supplied to the controller
and the main relay board.
7. Main Relay Board: High voltage supply
power and low voltage control power and
ground are supplied to the main relay board.
The main relay board contains:
• Relays to energize and de-energize unit
contactors and solenoids. Component
relays include the heater, evaporator fan
motor, condenser fan motor, and phase
reversal relays.
• Supply power circuit protection: - 20 amp
fuses (3) protect the high voltage circuits
on the main relay board.
• Control circuit fuse and circuit breaker
protection: - 7 amp manual reset circuit
breaker protects the 24 Vdc control circuit.
- 2 amp fuse protects the 28V ac control
power circuit to the controller. - 2 amp
fuse protects the battery charger output
circuit to the controller.
• Electronics for measuring phase sequence.
• Electronics for measuring amperage.
• Electronics for measuring voltage.
• Zero current transformer for earth leaking
measurement (option).