2020 MXZ Multi-Zone Tech Manual

Specifications subject to change without notice. 27 Dip Switch Functions 117 Switch Step Function Operation in Each Switch Setting Remarks Purpose Additional Information ON OFF When to Set SW5 function switch 7 During the outdoor unit is in HEAT operation, slightly opens the electronic expansion valve on the indoor unit which is in FAN, STOP, COOLor thermo-OFF * 3 . Active Inactive Can be set when OFF or during operation To open the LEV opening higher for units other than in HEAT operation. To avoid a refrigerant shortage (less capacity) due to refrigerant liquid accumulation in the units which is not in operation. A refrigerant flow noise might be generated in units other than the one in operation. 8 During the outdoor unit is in operation, fully opens the electronic expansion valve on the indoor unit which is in FAN, COOL, STOP, or thermo-OFF. * 4 Enable Normal Before turning the power ON. To reduce the room temperature increase by setting the LEV opening lower for the units in thermo-OFF operation. The refrigerant is more likely to collect in the units with thermo-OFF operation, and causing the units refrigerant shortage. (Results in less capacity and increase of discharge temperature.) SW6 function switch 1 — — — — <Initial settings> — — 2 Switch of current limitation reading in a different way Enable Normal Before turning the power ON. To lower the primary current limit by 3A. This switch is used for a single phase model with a breaker capacity 30A. (32A is the specified value) The performance of the unit might be somewhat reduced since the frequency would not rise enough due to the lowered current limitation. 3 — — — — — — 4 Change of defrosting control Enable (For high humidity) Normal Can be set when OFF or during operation To shorten the defrosting prohibition time in high humidity (or heavy snow) region, in order to reduce malfunctions caused by frost . The performance of the HEAT operation is somewhat reduced since the defrosting operation is frequently performed. 5 — — — — — 6 Switching the target discharge pressure (Pdm) Enable Normal To raise the performance by setting the PDm higher during HEAT operation. Power consumption is raised due to a higher frequency. (The performance would not be raise at the maximum operating frequency.) 7 Switching (1) the target evaporation temperature (ETm) Enable Normal To raise/reduce the performance by changing the target ETm during COOL operation. Switch to raise the performance: raises the performance Switch to reduce the performance: prevents dew condensation Switching it to raise the performance, it raises the power consumption, and produces more dew condensation. Switching it to reduce the performance, it makes the performance insufficient. 8 Switching (2) the target evaporation temperature (ETm) Enable Normal SW7 function switch 1 Ignore current sensor abnormality Enable Normal After turning the power ON. <Initial settings> To perform a test run for electrical parts alone without running the compressor. Make sure to connect the connectors to the compressor after checking the electrical parts.Be careful not to get electrical shock while working on electrical parts. 2 Setting to energize the freeze stat heater (optional part) During heating operation only * 5 Includewhen the heating operation is OFF. * 6 Can be set when OFF or during operation It reduces snow on the base, even it blows inside the unit, by setting the base heater ON while the HEAT operation is stopped. Power consumption raises while the operation is stopped. 3 — — — — — — 4 Maximum frequency down at 1 hour after COOL operation Enable Normal Can be set when OFF or during operation To reduce dew condensation on the indoor unit by lowering the frequency. The performance might be insufficient. 5 — — — — — 6 Forced defrost Forced defrost Normal During compressor running in HEAT mode. Turn ON when it is necessary to perform the defrosting operation forcedly. ( Effective only at start-up, or 10 minutes after the last defrosting operation) It performs the defrosting operation forcedly. (HEAT operation is stopped temporarily.) SW9 Function Switch 1 Auto change over from remote controller (IC with the minimum address) Enable * 2 Disable Before turning the power ON <Initial settings> Enables the indoor unit with the minimum address to select AUTO mode, and switches the operation mode of the other indoor units to the same mode. Cannot be set when the centralized control is ON. 2 Switching the Silent/ Demand mode Demand control Silent mode Can be set when OFF or during operation — About the Silent mode/Demand control setting, refer to "8-6. OUTDOOR UNIT INPUT/OUTPUT CONNECTOR". * 2 When a PWFY series is connected, this function is always disable regardless of the switch. * 3 SW5-7 Opens the indoor- electronic expancion valve as a countermeasure against the indoor unit in FAN, COOL, STOP, or thermo-OFF operation with refrigerant-shortage status due to an accumulation of liquid refrigerant in the indoor unit. * 4 SW5-8 Countermeasure against room temperature rise for indoor unit in FAN, COOL, and thermo-OFF (heating) mode. * 5 During heating operation and the ambient temperature is 39°F [4 : ] or below, the freeze prevention heater is energized. * 6 During heating mode is OFF (include thermo-OFF in cooling mode), and the ambient temperature is 39°F [4 : ] or below, the freeze prevention heater is energized. SW6-6 OFF ON TargetPdm (kg/cm²) 29.5 31.5 SW6-7 OFF ON OFF ON SW6-8 OFF OFF ON ON Target ETm ( : ) 9 11 6 14 1 ON OFF 2 3 4 5 6 7 8 <Initial settings> 1 ON OFF 2 3 4 5 6 1 ON MXZ-8C48NA MXZ-4C36/5C42/ 8C48NAHZ OFF 2 3 4 5 6 1 ON OFF 2 3 4 5 6 1 ON OFF 2 OCH573