Appliance Operation Outside The Application Limits; Defrosting; Frost Protection; Minimum Runtime And Minimum Pause Time - Stiebel Eltron SHP-A 220 Plus Utilisation Et Installation

OPErATiON
Appliance description
In the event of a higher hot water demand on a single occasion,
use the rapid heat-up key to activate the emergency/booster heat-
er manually for one-off heat-up in addition to the heat pump. See
chapter "Settings / 'Rapid heat-up' key / Rapid/comfort heating".
SHP-A 300 X Plus: Connection of an external heat generator
Material losses
!
Even if an external heat generator is connected, do not
disconnect the appliance from the power supply as oth-
erwise it is not protected against frost and corrosion. The
power supply must not be interrupted even in winter,
when it is possible that DHW heating is only being pro-
vided via the external heat generator.
The appliance is equipped with an integral smooth tube heat ex-
changer to which an external heat generator can be connected
(e.g. a solar thermal system or central heating system). The DHW
cylinder has sensor wells available for this in various positions.
Once during commissioning, the qualified contractor must match
the controls between the appliance and the external heat gen-
erator.
3.3 Appliance operation outside the application
limits
f To guarantee fault-free operation of the appliance, make sure f
you operate the appliance within its application limits (see
chapter "Specification / Data table").
3.3.1 Application limits for heat pump operation
Ambient temperatures below the application limit
At temperatures below the lower application limit hoar frost may
form on the evaporator depending on the air humidity and water
temperature. If hoar frost forms on the evaporator, the hoar frost
temperature monitor switches the heat pump compressor off. The
compressor switches on automatically once the evaporator has
defrosted.
Note
Heat-up times are longer while the evaporator is defrost-
ing.
Ambient temperatures above the application limit
The safety equipment switches the appliance off if the upper ap-
plication limit is exceeded. Following a cooling time of several
minutes the appliance is switched back on automatically. The
appliance is switched off again if the ambient temperature rises
above the permissible temperature value again.
3.4

Defrosting

Low air intake temperatures may result in the formation of hoar
frost on the evaporator, subject to relative humidity and DHW
temperature. The appliance is equipped with an electronic de-
frost monitor. DHW heating is interrupted during the defrosting
process. The appliance switches off the compressor during the
defrosting process. The fan continues to run. The defrosting pro-
cess is shown on the appliance display.
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A maximum defrost time is stored in the appliance. If the maxi-
mum defrost time is exceeded, the appliance stops the defrosting
process and releases the electric emergency/booster heater.
Note
Heat-up times are longer while the evaporator is defrost-
ing.
Note
The appliance starts the defrosting process as soon as
the compressor runtime reaches the "Defrost required"
time span stored in the appliance.
3.5

Frost protection

The appliance activates a frost protection function if the temper-
ature captured by the integral sensor is below a certain limit.
See chapter "Specification / Appliance parameters". The appliance
then heats the water by means of the heat pump and the electric
emergency/booster heater. The heat pump and electric emergen-
cy/booster heater switch off when the temperature captured by
the integral sensor reaches 18 °C.
3.6

Minimum runtime and minimum pause time

Material losses
!
When operating with external switching devices that can
interrupt the power supply to the appliance, such as time
switches, energy management systems or home automa-
tion systems, must adhere to the following conditions:
- The minimum ON time is 60 minutes.
- The minimum pause time following a shutdown is
20 minutes.
- The appliance should not be switched on/off more
than 10 times per day.
- The breaking capacity of the switching actuator must
meet the fuse protection requirements (see chapter
"Specification / Data table").
3.7

Connection of an external signal transmitter

Note
This type of connection must only be carried out by a
qualified electrician.
External signal transmitters can be integrated via the built-in con-
tact input, e.g. a PV system to make use of solar power generated
on site.
The appliance has a second set temperature preselected at the
factory. This is activated in the event of an external switching
signal. Set temperature 2 is higher ranking than the standard set
temperature while there is an external switching signal. Following
a one-off activation (signal is present for at least 1 minute), set
temperature 2 applies for at least 20 minutes and is ranked higher
than set temperature 1.
You can change set temperature 2 on the appliance (see chapter
"Settings/Settings/Set temperature 2").
SHP-A 220-300 Plus | 7