Detailed Explanation Of Setting Modes - Daikin ALTHERMA HT Service Manual

External Backup Heater Kit
7.4

Detailed Explanation of Setting Modes

To activate the heater kit some field settings on the indoor unit need to be changed. For details
how to change field settings refer to the chapter "Field settings" of the indoor unit installation or
operation manual.
 [6-02] Heater kit
Detailed
description
Note
 [8-02] Emergency operation
Note
 Benefit kWh rate power supply mode
Note
250
Once installed, you can activate the heater kit by changing field setting [6-02]=1. From that
moment on, the heat pump system will take the heater kit into account whilst deciding
operation. When the heater is actually operating, the heater symbol ( is shown on the
remote controller. There is no step 1-2 indication.
Use of backup heater with EKHBRD*AA*
Normal heat pump operation
During heat pump tariff
Ta < -25°C
(*) Auxilary relay (following heat pump tariff signal) can be applied to switch off BUH during
HP tariff operation
Use of backup heater with EKHBRD*AB*/EKHVMY(R)D*AA*
Normal heat pump BUH assistance
operation possible
During heat pump BUH operation
tariff
Heat pump operation
Ta < -25°C Automatic switch over
to BUH operation
(*) Auxilary relay (following heat pump tariff signal) can be applied to switch off BUH during
HP tariff operation
Setting [8-01]:
Not for EKHBRD*AA*: was used to set auto restart on or off. This has been changed to
default on.
During emergency mode, heating is only done by the heater kit, not by the heat pump.
Activation of emergency mode is done by changing field setting [8-02]=1. Activating the
emergency mode will stop the heat pump operation. The pump of the indoor unit will be
started, but heating itself is done by the heater kit. If there are no error conditions in leaving
or returning water thermistors, the heater kit can start to follow emergency operation.
Before activating emergency operation, be sure to activate the heater kit. The heater will
stay in emergency mode until the field setting is set back to default [8-02]=0.
This concerns the benefit kWh rate power supply mode of the EKHBRD/EKHVM indoor unit.
For more details, refer to the "Field settings" chapter of the indoor unit installation manual.
If the benefit kWh rate power supply is used for the indoor unit, the indoor unit will go into
emergency operation automatically when the power supply is interrupted.
BUH assistance possible
BUH operation
Heat pump operation
Automatic switch over to BUH
operation
[6-02]=0
[8-01]=0 [8-01]=1
NO NO
NO NO
NO NO
NO NO
ESIE09-08B
[6-02]=0 [6-02]=1
NO YES
NO YES (*)
NO NO
NO NO
[6-02]=1
[8-01]=0 [8-01]=1
YES YES
NO YES
NO NO
(*)
NO YES
Appendix