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6. Test Run
Performing a test run
Refer to the test run procedures in the indoor unit
installation manual.
Perform the test run separately for each connected
indoor unit. If 2 units are operated simultaneously, it
is not possible to correctly check for errors in tubing
and wiring.
If the room temperature is 15°C or below, it may not
be possible to check for tubing errors with cooling
operation. If this occurs, perform heating operation
for each unit individually, and check that warm air is
discharged from each unit. If there is cold air mixed
in with the warm air, check the tubing connections
again.
Checking tubing and wiring
Perform the test run and check that operation is nor-
mal. If there is an error in tubing or wiring, the refriger-
ant may flow to indoor unit B when indoor unit A is
operated (for example).
CAUTION
Stop operation immediately if there is an error in
tubing or wiring. Turn the power (breaker) to OFF,
and check whether the inter-unit cables are con-
nected incorrectly, or whether the narrow tubes A
and B are connected in reverse. Correct the con-
nections.
If there is an error in tubing, pump-down must be
performed. Be sure to perform pump-down. After
making corrections, again purge the air from the
tubes.
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