Daikin Altherma HT - Page 264

External Backup Heater Kit ESIE09-08B
252 Appendix
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