Mitsubishi PEH series User Manual Download Page 48

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2) Outdoor unit

1) Check Items

•

After installation of indoor and outdoor units, and piping and electric wiring
work, check that the unit is free from leaks of refrigerant, loosened connec-
tions, and incorrect polarity.

•

Check that there is no negative phase and open phase. (The F1 message for
negative phase and the F2 message for open phase will flash at LED 1 on the
outdoor substrate. If this happens, rewire correctly.)

•

Measure the impedance between power terminals (Single phase: L, N,

triple phase: L1, L2, L3, N,

) and the ground with a 500 V Megger and check

that it is 1.0 M

Ω

or more. Do not operate the equipment if measurement is less

than 1.0 M

Ω

. * Never conduct this operation on the outdoor connection wiring

terminals (S1, S2, S3) as this causes damage.

•

When there is no error at the outdoor unit.
(If there is an error at the outdoor unit, it can be evaluated at LED 1 [digital
display] of the outdoor substrate.)

•

The stop valves are open both the liquid and gas sides.
After checking the above, execute the test run in accordance with the follow-
ing.

2) Test run start and finish

•

Operation from the indoor unit
Execute the test run using the installation manual for the indoor unit.

•

Operation from the outdoor unit
Execute settings for test run start, finish and operation mode (cooling, heating)
using the DIP switch SW 4 on the outdoor substrate.

Set the operation mode (cooling, heating) using SW 4-2

Turn ON SW 4-1, The operation mode for SW 4-2 will be adhered to, and
the test run will commence

Turn OFF SW 4-1 to finish the test run

•

There may be a faint knocking noise emitted from the proximity of the fan
during the test run. This is torque fluctuation occurring due to control of fan
revolutions. There is no problem with the product.

Note:
The SW 4-2 operation mode cannot be changed during the test run. (To change
test run mode, stop the equipment with SW 4-1, change the operation mode,
then restart test run with SW 4-1.)

•

If the 2-hour timer is set, the test run will stop automatically after 2 hours.

•

During the test run, the room temperature display on the indoor unit will indi-
cate the temperature of the indoor unit piping.

1.3. Self-diagnosis

Use the remote controller to look up each units error history.

OFF

<SW4>

1
2

[Fig. 1.2.2]

Stop

Cooling

Operation

Heating

Change to self-diagnosis mode

Press the CHECK button twice within three seconds to show the following
display.

Select the refrigerant address number to be self-diagnosed

Press the

buttons to scroll through the refrigerant address num-

bers (00 to 15) and select the refrigerant address number to be self-diagnosed.
After three seconds from making the change, the lit refrigerant address to be
self-diagnosed will start to flash, and self-diagnosis will commence.

Self-diagnosis result display

See the above chart for details of error code contents.

(1) When there is an error history

(2) When there is no error history

(3) When the address does not exist

Alternating display

Error code

Attribute of error search

Unit number

Reset error history

Display the error history at the self-diagnosis result display screen

The address for self-diagnosis will flash when the

ON OFF

CLOCK

button is pressed

twice within three seconds.

The diagram on the left will be displayed when error history has been reset.
Note that the error content will be redisplayed if error history resetting is un-
successful.

Alternating display

[Fig. 1.3.1]

STAND BY
DEFROST

INDOOR UNIT

ADDRESS NO

CLOCK

ON OFF

˚C

1Hr.

˚C

CHECK MODE

FILTER