2020 MXZ Multi-Zone Tech Manual

Specifications subject to change without notice. 26 Dip Switch Functions 116 8-10. INTERNAL SWITCH FUNCTION TABLE (1) Function of switches MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ MXZ-8C48NA Continue to the next page Switch Step Function Operation in Each Switch Setting Remarks Purpose Additional Information ON OFF When to Set SWU1 unit digit SWU2 tens digit Rotary switch Before turning the power ON <Initial settings> SW1 Digital Display Switch 1–8 Can be set either during operation or not. <Initial settings> SW2 Function Switch 1 Selects operating system startup With centralized controller Without centralized controller Before turning the power ON <Initial settings> Turn ON when the centralized controller is connected to the outdoor unit. — 2 Connection Information Clear Switch Clear Do not clear When relocating units or connecting additional units. — 3 Abnormal data clear switch input Clear abnormal data Normal OFF to ON any time after the power is turned on. To delete an error history. 4 Pump down Run adjustment mode Normal During compressor running To facilitate outdoor unit the pumping down operation. Frequency = Fixed to 65 Hz Indoor-electronic expansion valve = Fully open Outdoor fan step = Fixed to 10 Please refer to a section referring to the pumping down on outdoor units Installation Manuals. It might not be possible to collect all the refrigerant if the amount is excessive. SW2-5, 6/ SW4/ SW8 Model Switch 1–6 MODEL SELECTION 1:ON 0:OFF Before the power is turned ON. <Initial settings> Set for each capacity. — — SW3 Trial operation 1 ON/OFF from outdoor unit* 1 ON OFF Any time after the power is turned ON. <Initial settings> — — 2 Mode setting Heating Cooling — — SW5 Function switch 1 Demand control setting forAustralia Australia setting Normal Can be set when off or during operation <Initial settings> Turn ON to activate the demand control for Australia. (Do not turn this ON if the unit is in outsideAustralia) 2 Change the indoor unit's LEV opening at start-up Enable Normal To set the LEV opening at start-up higher than usua l. (+150 pulses) To improve the operation with the LEV almost clogged. The refrigerant flow noise at start- up become louder. 3 — — — — — 4 — — — OFF to ON during compressor running. — — 5 Change the indoor unit's LEV opening at defrost Enable Normal Can be set when OFF or during operation To set the LEV opening higher than usual during defrosting operation. (Only Qj [ 10 is valid, + 300 pulses) To avoid the discharge temperature increase and provide efficient defrosting operation. The refrigerant flow noise during the defrosting operation becomes louder. 6 Switching the target sub cool (Heating mode) Enable Normal To decrease the target sub cool value. To reduce the discharge temperature decrease due to refrigerant liquid accumulation in the units. A refrigerant flow noise might be generated if the sub cool value is too small. * 1 Test run on PWFY series cannot be run by the outdoor unit. Use a switch on the indoor unit or a remote controller to perform test run. The black square ( ■ ) indicates a switch position. 1 ON OFF 2 3 4 5 6 7 8 SWU2 (tensdigit) 0 1 2 3 4 5 6 7 8 9 SWU1 (unitdigit) 0 1 2 3 4 5 6 7 8 9 1 ON OFF 2 3 4 5 6 SWU2 (tensdigit) 0 1 2 3 4 5 6 7 8 9 SWU1 (unit digit) 0 1 2 3 4 5 6 7 8 9 1 ON OFF 2 3 4 SW2 5 ON OFF 6 5 ON OFF 6 1 ON OFF 2 1 ON OFF 2 SW4 MODELS MXZ-4C36NAHZ SW8 MXZ-5C42NAHZ 1 ON OFF 2 3 4 5 6 ON OFF 1 2 3 4 5 6 SW2 5 ON OFF 6 5 ON OFF 6 1 ON OFF 2 1 ON OFF 2 SW4 MODELS MXZ-8C48NAHZ SW8 MXZ-8C48NA 1 ON OFF 2 3 4 5 6 ON OFF 1 2 3 4 5 6 1 ON OFF 2 1 ON OFF 2 3 4 5 6 7 8 OCH573