ESIE09-08B Outline of Control (Indoor Unit)
Function 65
External room thermostat
When the reheat temperature is reached, the further heat up of the domestic hot water tank will
be decid
ed 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 ope
ration. 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 simultaneou
s 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 D
omestic hot water upper limit temperature (max
imum 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
MN
B
C
H
J
75°C
35°C
–X°C
+X°C
ON
G
F
OFF
D
E
ON
OFF
K
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