Daikin ALTHERMA HT EKBUHAA6 V3, Service Manual

Page: 83 / 302

ESIE09-08A Outline of Control (Indoor Unit)
Function 71
6.2 Simultaneous demand of space heating and domestic water
heating
Space heating operation can be executed in 3 different ways:

Remote controller leaving water temperature control

External room thermostat

Remote controller room temperature control
The domestic water heating operation can be controlled in 2 different ways:

Reheat operation:
The reheat mode will prevent the domestic hot water from cooling down lower than a certain
temperature. When enabled the indoor unit will deliver hot water to the domestic hot water tank if the
minimum value is reached and this according below described settings.
*1

Storage operation:
In this mode, the indoor unit will deliver hot water to the domestic hot water tank based on a daily
pattern (day and/or night). The heated water is stored at a higher temperature so it can fulfill the
domestic hot water requirements throughout the day.
*2
*1 Remark: This function can only be activated by the shower button. Shower icon should be led.
*2 Remark: This function can only be set by field settings. This function can only be activated by the
schedule timer button and this icon should be led.
Remote controller leaving water temperature control
When the reheat temperature is reached, the further heat up till storage temperature of the domestic hot
water tank will be decided by the running timers which are programmed by the installer.
1. Reheat operation
When requesting space heating and domestic water heating (reheat) at the same time, this involves
that the minimum reheat temperature is reached (setting [b-00]) during space heating operation. The
3-way valve will switch over to the domestic hot water side. Now, the domestic water will be heated
till maximum reheat temperature (setting [b-01]). The 3-way valve will switch back to original
position, then space heating will start again. When a domestic hot water tank is installed, the reheat
function is always available. The minimum domestic hot water reheat temperature is 35°C and the
maximum value is 75°C.
A Operation
Space heating
Domestic water heating
B Domestic hot water reheat thermo-on request
C Domestic hot water tank temperature
D Leaving water thermo-on request
F Domestic hot water lower limit temperature
G Domestic hot water upper limit temperature (maximum possible storage temperature) [b-03]
A
B
C
H
J
75°C
35°C
ON
G
F
OFF
D
ON
OFF
M N