Daikin ALTHERMA HT EKBUHAA6 V3, Service Manual

Page: 85 / 302

ESIE09-08A Outline of Control (Indoor Unit)
Function 73
External room thermostat
When the reheat temperature is reached, the further heat up of the domestic hot water tank will be decided
by the external room thermostat thermo conditions and 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. 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.
During the reheat operation, the system does not take care about the room temperature. This means
that during simultaneous demand, the reheat operation has priority over the room temperature.
A Operation
Space heating
Domestic water heating
B Domestic hot water reheat thermo-on request
C Domestic hot water tank temperature
D Room temperature thermo-on request
E Remote controller room temperature
F Domestic hot water lower limit temperature
G Domestic hot water upper limit temperature (maximum possible storage temperature) [b-03]
H Domestic hot water reheat minimum temperature [b-00]
J Domestic hot water reheat maximum temperature [b-01]
K External room thermostat set point
L External room thermostat ON/OFF hysteresis
M Simultaneous demand
N ONLY space heating request
ON ON
OFF OFF
A
M N
B
C
H
J
L
75°C
35°C
–X°C
+X°C
ON
G
F
OFF
D
E
ON
OFF
K K