Carrier X-POWER Series Service Manual page 163

Carrier service manual
4.15.1 xL0/xL8/xL9 troubleshooting
Step 1: Replace the modular with correctly wire connection and start the system, if system is still
malfunction, then go to step 2 to check the compressor.
Step 2: Take out the compressor from the malfunction system, short-circuit the suction and the discharge,
vacuum dry and charge 0.3kg~0.4kg R410A, and then connect the U,V,W terminals to control box B which is
took apart from normal system.
If the compressor start normally, that means compressor is OK, control box A is malfunction, then check the
inverter module.
If the compressor could not start normally, that means the compressor is malfunction, then go to step 3 to
check the compressor.
Step 3: Check the compressor
Measure the resistance between each two of U, V, W terminals, all the resistance should be the same
and less than 5 Ohms. (Fig. A and Fig. B)
Measure the resistance between each of U, V, W terminals to ground (Fig. C), all the resistance should be
the same and trend to be infinity (Fig. D), otherwise the compressor has been malfunction, needs to be
replaced.
4.15.2 xL1/xL4 troubleshooting
Step 1: Check the DC voltage between P and N terminal, the normal value should be 270V~360V, if the
voltage is lower than 270V, go to step 2.
Troubleshooting
Fig. A
Fig. C
R410A DC Inverter Series
Fig. B
Fig. D
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