Operating instructions
22
Daikin RoCon HP
Daikin Control
008.1420844 – 05/2014
3
x
Operation
Electrical connections to settings 2 and 3 of the
parameter [Function Heating Rod]
Caution!
Risk of voltage arcing.
●
The connections on the RTX-EHS circuit board
must not be used for switching the mains voltage
(~230 V) and protective low voltage (SELV =
"Safety Extra Low Voltage") at the same time.
Demand from an alternative heat generator is switched to the
RTX-EHS circuit board via a relay (see fig. 3-16).
A1P Circuit board (basic control of
the heat pump)
K1/2/3
Relay for backup heater
L
Phase
N
Neutral
PE
Protective earth conductor
RTX-EHS
Switch board (backup heater)
X1
Terminal block for mains con-
nection to backup heater
X2_1 /2/3
Internal cabling
X3
Plug connection internal ca-
bling to RTX-AL4 circuit
board
Fig. 3-16 Connections on RTX-EHS circuit board
The switching contacts can be connected as
a) Potential-free control contacts
b) Power supply for alternative heat generator (~230 V, maxi-
mum load 3,000 W)
Connection X1 is a screw terminal. Isolated 6.3 x 0.8 mm push-
on receptacles are required for connections X2_1/2/3.
The correct electrical connection for the alternative heat gen-
erator must be taken from the device installation instructions.
More detailed explanations and possible setting values for this function can be seen
in chapter 5.2.1.
3.6.8 Heating support
If the heating support function (parameter [HZU] = On) is acti-
vated, the energy in the Daikin Altherma EHS(X/H) integrated
storage tank is used to take over the heating function. At a suffi-
ciently high storage tank temperature, the heat pump (refrigerant
circuit) remains out of use.
The minimum value (T
HZUmin
) is calculated as follows:
T
HZUmin
= current active target hot water temperature [T-DHW
Setpoint] + parameter [TDiff-DHW CH Support].
Switch-on condition:
Tdhw > T
HZUmin
+ 4 K
and
Tdhw > info parameter [T-HS Set-
point] + 1 K
If the switch-on condition is fulfilled, heat is taken from the
storage tank for the heating system.
Switch-off condition:
Tdhw < T
HZUmin
or
Tdhw < info parameter [T-HS Setpoint]
(see section 3.6.4)
If the switch-off condition is fulfilled, the heating support is
stopped in the domestic hot water storage tank and the heat
pump takes over the heating operation.
Parameter [Power BIV] limits the maximum power which can be
removed. Parameter [T vbh1 max] limits the maximum temper-
ature which the heating system can reach.
More detailed explanations and possible setting values for this function can be seen
in chapter 5.2.2.
3.6.9 Special function: Switching contacts
Setting the parameter [AUX Fct] changes the switching condi-
tions for the AUX switching contact (toggle switch output A). This
switching contact can be used, for example, to control an external
heat generator.
If one of the switching conditions is fulfilled, the potential-free
switching contact changes over after the time set in the pa-
rameter [AUX time] has passed.
AUX switching contact
(toggle switch output
A
)
is
not switched
if setting =
0: Function deactivated.
AUX switching contact
(toggle switch output
A
)
is switched
if
setting =
1: When storage tank temperature (Tdhw)
≥
value of param-
eter [T-DHW 1 min].
2: When there is a cooling or heating demand.
3: When there is a hot water demand to the heat pump or the
configured backup heater is required for heating support.
4: When there is a malfunction.
5: When sensor value (TVBH) > 60 °C.
6: When the outdoor temperature < parameter value [Equilib-
rium Temp].
Heat pump continues to operate = parallel bivalence oper-
ation.
