Service Functions; Actuator Control; Relation Between Main Sensor And Actuator; Locking The Operation Mode Of The Conditioner - Mitsubishi Electric MXZ-2A40VA Service Manual

11

ACTUATOR CONTROL

MXZ-2A40VA MXZ-2A52VA MXZ-3A54VA MXZ-4A71VA MXZ-4A80VA

Relation between main sensor and actuator

Sensor
Discharge temperature thermistor
Indoor pipe temperature thermistor
Defrost thermistor
Gas pipe temperature thermistor
(MXZ-3A54/4A71/4A80VA)
Fin temperature thermistor
Ambient temperature thermistor
Outdoor heat exchanger temperature
Capacity code
12

SERVICE FUNCTIONS

MXZ-2A40VA MXZ-2A52VA MXZ-3A54VA MXZ-4A71VA MXZ-4A80VA
12-1. Locking the operation mode of the conditioner ( COOL, DRY, HEAT)
Description of the function:
With this function, you can lock the operation mode of the
outdoor unit. Once the operation mode is locked to either
COOL/DRY mode or HEA mode, the air conditioner oper-
ates in that mode only.
Initial setting is required to activate this function. Please ex-
plain about this function to your customers and ask them
whether they want to use it.
[How to lock the operation mode]
1
Be sure to turn off the main power for the air conditioner
before making the setting.
2
Set the 2nd Dip Switch of SW1 on the display P.C. board or
the outdoor electronic control P.C. board to ON to enable
this function.
3
To lock the operation mode in COOL/DRY mode, set the 1st
Dip Switch of SW1 on the display P.C. board or the outdoor
electronic control P.C.board to OFF.
To lock the operation in HEAT mode, set the same switch to
ON.
4
Turn on the main power for the air conditioner.
12-2. Lowering the operating noise of the outdoor unit
Description of the function:
With this function, you can lower the operating noise of the
outdoor unit when the operation load is small, for example,
during nighttime in COOL mode. However, please note that
the cooling and heating capacity can also be lowered if this
function is activated.
Initial setting is required to activate this function. Please ex-
plain about this function to your customers and ask them
whether they want to use it.
[How to lower the operating noise]
1 Be sure to turn off the main power for the air conditioner
before making the setting.
2
Set the 3rd Dip Switch of SW1 on the display P.C. board or
the outdoor electronic control P.C. board to ON to enable this function.
3
Turn on the main power for the air conditioner.
Purpose
Protection
Defrosting Protection
Defrosting
Control
Protection
Control
Protection
Control
T
Compressor LEV
MXZ-2A40/2A52
ON ON
COOL/DRY HEAT
ON
Lower the operating
noise
50
Actuator
Outdoor Reversing
fan motor valve
ON
MXZ-3A54/4A71/4A80