Daikin ALTHERMA HT EKBUHAA6 V3, Service Manual

Page: 274 / 302

External Backup Heater Kit ESIE09-08A
264 Appendix
(*): approximate value (depends on operation conditions (e.g. dT, HP indoor unit))
Emergency
operation
(*): approximate value (depends on operation conditions (e.g. dT, HP indoor unit))
Internal starting
conditions
Defrost heat pump
operation
Step 0 -> Step 1
&

Q2L = ON

LWT < ~ LWT setpoint - 15 (*)

LWT < 55°C

Heat request
Step 1 -> Step 2
&

LWT < ~ LWT setpoint - 12 (*)

LWT < 55°C

TM1 up (5 minutes)
Step 2 -> Step 1
or

LWT > ~ LWT setpoint - 6,5 (*)

LWT > 65°C
Step 1 / 2 -> Step 0
&

Q2L = OFF

LWT > 70°C

LWT > ~ LWT setpoint - 3,5 (*)

No heat request
EMERGENCY OPERATION
Step 0
(no BUH operation)
Step 1
Step 2
TM
1
TM
1
Note
The TM* indicate timers, these start counting down if they
are crossed when going from one step over to another
step.
TM1: 5 minutes
Request -> Operation
&

Safe guards not operated

Flow at least 5 seconds at 9l/min

Entering water temperature < 75°C