Easy Maintenance Function; Maintenance Mode Operation Method; Switching To Maintenance Mode; Fixed Hz Operation - Mitsubishi Electric PUZ-A18NHA4 Service Manual

11

EASY MAINTENANCE FUNCTION

Reduces maintenance work drastically.
Enables you to check operation data of the indoor and outdoor units by remote controller.
Furthermore, use of maintenance stable-operation control that fixes the operating frequency, allows smooth inspection, even
for inverter models.
Smooth Mainte-
nance Function
Easy maintenance information (unit)
Compressor Outdoor unit
Accumulated operating Heat exchanger
time ( 10 hours) temperature (°F)
Number of ON/OFF Discharge
times ( 10 times) temperature (°F)
Operating Outside air
current (A) temperature (°F)
* The filter operating time is the time that has elapsed since the filter was reset.

11-1. MAINTENANCE MODE OPERATION METHOD

* If you are going to use the "11-2.GUIDE FOR OPERATION CONDITION", set the airflow to "High" before activating
maintenance mode.

Switching to maintenance mode

Maintenance mode can be activated either when the air conditioner is operated or stopped.
It cannot be activated during test run.
Maintenance information can be viewed even if the air conditioner is stopped.
Remote controller button information
(1) Press the button for 3 seconds to switch to maintenance mode.
TEST
[Display ]
MAINTENANCE
If stable operation is unnecessary or if you want to check the data with the air conditioner stopped, skip to step (4).

Fixed Hz operation

The operating frequency can be fixed to stabilize operation of inverter model.
If the air conditioner is currently stopped, start it by this operation.
(2) Press the button to select the desired operation mode.
MODE
Stable cooling
[Display ]
operation
COOL
STABLE MODE
(3) Press the ( ) button to check the setting.
FILTER
[Display ] Waiting for stabilization
Discharge temperature 147 °F
Remove the
service panel.
Indoor unit
Measure the discharge
temperature.
Intake air
temperature (°F)
Heat exchanger
temperature (°F)
Filter operating
time* (Hours)
Compressor information Outdoor unit information Indoor unit information
Operation mode
Stable heating Stable operation
operation cancellation
HEAT STABLE MODE
STABLE MODE CANCEL
85
Conventional inspection work
Outdoor unit
Indoor unit
Measure
the intake air
temperature.
Measure the outside air
temperature
Confirm
Activate/cancel maintenance mode
After 10 to 20 minutes
Stabilized