![background image](http://html1.mh-extra.com/html/carrier/69nt40-541-304/69nt40-541-304_operation-service-and-parts-supplement_2563842046.webp)
T-319
4–4
b. TO RUN AN INDIVIDUAL TEST: Scroll through the selections by pressing the UP ARROW or DOWN
ARROW keys to display an individual test code. Pressing ENTER when the desired test code is displayed.
• Individually selected tests, other than the LED/Display test, will perform the operations necessary to ver-
ify the operation of the component. At the conclusion, PASS or FAIL will be displayed. This message will
remain displayed for up to three minutes, during which time a user may select another test. If the three
minute time period expires, the unit will terminate pre-trip and return to control mode operation.
• While the tests are being executed, the user may terminate the pre-trip diagnostics by pressing and hold-
ing the PRE-TRIP key.Theunit will then resume normal operation. If the user decides to terminate a test
but remain at the test selection menu, the user may press the UP ARROWkey.When this is done all test
outputs will be de-energized and the test selection menu will be displayed.
• Throughout the duration of any pre-trip test except the P-7 high pressure switch tests, the current and
pressure limiting processes are active.
2. At the end of the pre-trip test selection menu, the message “P,” “rSLts” (pre-trip results) will be displayed.
Pressing the ENTER key will allow the user to see the results for all subtests (i.e., 1-0, 1-1, etc). The results
will be displayed as “PASS” or “FAIL” for all the tests run to completion since power up. If a test has not been
run since power up, “ -- -- -- -- -- ” will be displayed.
3. Once all pre-test activity is completed, dehumidification and bulb mode must be reactivated manually if
required.
4.6
DEFROST OPERATION
4.6.1
Dual Temperature Remote Defrost
The remote evaporator fans will shut off in defrost and timed defrost is independent of the host unit. When a man-
ual defrost is initiated in the host unit, it will also defrost the remote. Remote defrost will be terminated on remote
DTS temperature. The remote high temperature thermostat (RHTT) is wired in series with the heater contactor for
safety.
Summary of Contents for 69NT40-541-304
Page 2: ......
Page 4: ......
Page 8: ...T 319 iv...
Page 14: ...T 319 1 4...
Page 34: ...T 319 2 20...
Page 48: ...T 319 5 2...
Page 61: ...7 3 T 319 Figure 7 2 Schematic 69NT40 541 304...
Page 62: ...T 319 7 4 Figure 7 3 Unit Wiring Diagram Sheet 1 69NT40 541 304...
Page 63: ...7 5 T 319 Figure 7 4 Unit Wiring Diagram Sheet 2 69NT40 541 304...
Page 64: ...T 319 7 6 Figure 7 5 Legend 69NT40 541 345...
Page 65: ...7 7 T 319 Figure 7 6 Schematic 69NT40 541 345...
Page 66: ...T 319 7 8 Figure 7 7 Unit Wiring Diagram Sheet 1 69NT40 541 345...
Page 67: ...7 9 T 319 Figure 7 8 Unit Wiring Diagram Sheet 2 69NT40 541 345...
Page 68: ...T 319 7 10...
Page 77: ...12 4 T 319...
Page 78: ...T 319 13 1 13 RECEIVER 8 5 17 18 19 20 4 Item 1 4 2 3 6 7 8 6 7 10 9 11 12 13 14 15 16 2...
Page 81: ...14 2 T 319...
Page 84: ...T 319 17 1 17 REMOTE EVAPORATOR FRAME A A A A 4 2 5 6 3 8 9 1 15 11 7 12 10 14 13 2 2 2 9 3 9...
Page 87: ...18 2 T 319...
Page 100: ...T 319 26 2...
Page 104: ...T 319 Index 4...
Page 105: ......