Heat Pump, Split System, Single Service, 3 phase
Maintenance Document 1394-1 21
3.5.1 Principle of Operation
DHW production starts when the temperature inside
the tank is 7°C less than the setpoint temperature.
The setpoint can be either a "reduced" or a "nominal"
setpoint, depending on time program 4. During the
programmed time periods it is the nominal setpoint
which is active, and outside of these periods it is the
reduced setpoint which is active. Thus, to avoid
accidental DHW charge boosting outside of the
nominal time periods, we recommend having a
reduced setpoint as low as possible in order to avoid
the starting of DHW production outside the
programmed time period.
• T
reduced
: the temperature outside the time period.
This DHW temperature can be reached with the
heat pump alone. This requires that the
temperature does not exceed 35°C.
• T
nominal
: the temperature within time period 4,
which is approached first with the heat pump then
with the electric auxiliaries or the boiler backup (if
necessary).
Both of these temperatures are
adjustable (settings 1610 and 1612).
If the installation's power supply contract includes a
Peak/Off-Peak rate subscription, the heaters will be
controlled by the power rates and T
nominal
will be
reached only during Off-Peak Hours. This requires
that input E5 is wired as shown on Figure 1: Typical
Wiring of External
Devices.
If no special power supply contract has been
subscribed to, or if the DHW input is not wired, T
nominal
will be reached according to time program 4 / DHW.
The T
nominal
temperature can thus be reached at any
time, including during the day.
During the day, DHW has priority over heating,
however, DHW production is controlled by cycles
which regulate the times allocated to heating and to
DHW production in case of simultaneous demands.
A DHW boost function is available on the user
interface front panel. This DHW boost enables the
DHW to be heated up to T
nominal
at any time during the
day. The boost function is automatically cancelled
after a given time (which can be configured). The
boost function can be used only if DHW programming
has been performed. If the DHW is in nominal mode
(nominal T) the boost function is obviously
inoperative.
Legionella protection cycles can be programmed.
3.6 Test Mode
3.6.1 Sensor and Input Test Mode
LINE SENSOR INPUT WATERSTAGE
7730 B9 Outdoor temperature
7820 BX1 DHW temperature
7823 BX4 Heat pump flow temperature
7824 BX5 Heat pump return temperature
7830 BX21 (1) Circuit 1 flow T if 2 circuits (or sw pool)
7831 BX22 (1)
7832 BX21 (2)
7833 BX22 (2)
7841 H1 defrost information
7846 H2 swimming pool operation (if optional)
7855 H3 outdoor unit fault (370)
7914 EX4 Auxiliary load-shedding (EJP)
7915 EX5 Peak/Off-peak rates
7916 EX6 External fault (369)
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