Daikin ALTHERMA HT Service Manual page 80

Outline of Control (Indoor Unit)
2. Storage operation
68
When requesting space heating and domestic water heating (storage) 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, then the
domestic water will be heated, but as soon as the room temperature drops 3°C from set
point (smart logic), the 3-way valve will go to original position and start space heating till
0.5°C above set point, then the 3-way valve will switch over to the domestic hot water side
and then the domestic water will be heated again till storage set point.
K
E
D
C
J
B
A
M R
1
6
5
Operation
A
Space heating
Domestic water heating
Domestic hot water storage thermo-on request
B
Domestic hot water tank temperature
C
Room temperature thermo-on request
D
Remote controller room temperature
E
Domestic hot water lower limit temperature
F
Domestic hot water upper limit temperature (maximum possible storage
G
temperature) [b-03]
Domestic hot water reheat maximum temperature [b-01]
J
Remote controller thermostat set point
K
Simultaneous demand
M
ONLY domestic hot water request
N
Point where space heating gets priority
R
ON
ON
OFF
OFF
Minimum operation time for domestic water heating (initial 10 minutes [d-00])
1
Maximum operation time for domestic water heating (initial 30 minutes [d-01])
2
Interval minimum stop time for domestic water heating (initial 15 minutes [d-02])
3
No simultaneous operation
N=4
Timers for domestic water heating start
5
Timer for space heating start
6
Remark:
a. The minimum operation time is only valid when room temperature is more than 3°C lower as
set point and set point J is reached.
b. The maximum operation time is only valid when room temperature is more than 0.5°C lower as
set point and set point J is reached.
+0.5°C
–0.5°C
–3.0°C
ON
OFF
G
75°C
F
35°C
ON
OFF
N
4
3
2
ESIE09-08B
(a)
(b)
Function