Daikin EWYQ230DAYN [392/524] Defrost management

Functional Control for a Standalone Unit ESIE06-05

2–166 Part 2 – Functional Description

3.22 Defrost management

3.22.1 Introduction

For dual circuit units, each refrigerant circuit will enter defrost function separately. The defrost cycle

will only occur on the circuit that needs it. The other circuit will continue its normal operation when

required.

In heating mode, the defrost will be executed when the following conditions are met:

■ Manual defrost is requested.

■ The temperature sensors reach a certain value.

3.22.2 Manual defrost

If below conditions are met during compressor operation in heating mode, a manual defrost can be

selected from the user menu.

Only possible if:

1 The user requests a manual defrost via the controller.

2 Tr < 10° C (or when thermistor abnormality : Ta < 7°C)

Remark : in case of coil thermistor error, condition is based on ambient temperature.

No defrost forbid timer active when manual defrost is selected.

Unit defrost setting: If manual defrost starting conditions are satisfied for both circuits, 2nd circuit

defrost will only start after defrost finish of 1st circuit. During 1st circuit defrost, defrost finish conditions

for 2nd circuit are not evaluated, so 2nd circuit defrost is guaranteed.

Remark : manual defrost can be requested in the user/defrost menu.

Tr: coil temperature.

Ta: ambient temperature.