Daikin ALTHERMA HT EKBUHAA6 V3, Service Manual

Page: 273 / 302

ESIE09-08A External Backup Heater Kit
Appendix 263
6.5 External Backup Heater Control
Normal operation
Step 0 -> Step 1
&

20 minutes compressor operation

Compressor runs on high frequency

Pump speed > ~2500 rpm (with E-03 set to default 1)

LWT > ~ LWT setpoint - 8 (*)

LWT < ~ LWT setpoint - 4 (*)

If controller room thermostat function: RT<RT setpoint - 2 (normal heat load)
Step 1 / 2 -> Step 0
or

Q2L = OFF

DHW operation

LWT > LWT se 2

If room thermostat function: RT > RT setpoint
Step 1 -> Step 0

LWT > LWT setpoint
Step 1 -> Step 2
&

TM2 up

LWT < ~ LWT setpoint - 6 (*)

RWT < ~ LWT setpoint - 10 (*)
Step 2 -> Step 1
or

LWT > ~ LWT setpoint - 2,5 (*)

RWT > ~ LWT setpoint - 6 (*)
Step 0 -> Step 2
&

20 minutes compressor operation

Compressor runs on high frequency

Pump speed > ~2500 rpm (with E-03 set to default 1)

LWT < ~ LWT setpoint - 8 (*)
NORMAL OPERATION
(BUH assistance)
Step 0
(no BUH operation)
Step 1
Step 2
TM
1
TM
1 TM
2
TM
2
Note

Timer during normal operation
The TM* indicate timers, these start counting down if they
are crossed when going from one step over to another
step.
TM1: 5 minutes
TM2: 10 minutes

BUH operation after defrost if already active before
Timer: 10 minutes
Compressor operation: 5 minutes & high frequency