Carrier 69NT40-541-306, Операция и обслуживание

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T-354 7–32
7.22.2 Controller Troubleshooting
A group of test points (TP) (see Figure 7.27 ) are provided on the controller for troubleshooting electrical circuits
(see schematic diagram, Section 8 ). A description of the test points follows:
Figure 7.27 Controller Section of the Control Box
NOTE
Use a digital voltmeter to measure AC voltage between TPs and ground (TP9), except for TP8.
TP 2 - This test point enables the user to check if the internal protector for the compressor motor (IP-CP) or high
pressure switch is open.
TP 3 - 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 enables the user to check if the controller water tank heater relay (TQ) is open or closed.
TP 7 - This test point is not used in this application.
TP 8 - This test point is not applicable to the units covered herein.
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.
Controller Software
Programming Port
Mounting Screw
Controller
Test Points