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2.3 Safety and Control Devices
The HPCDW is equipped with the following safety features:
2.3.1 High-pressure pressostat (HD)
The high-pressure pressostat protects the heat pump from excessive operating pressures in the refrigeration cycle.
In the case of a malfunction, the pressostat switches off the heat pump; the heat pump is restarted automatically as
soon as the pressure in the refrigeration cycle has dropped to an acceptable level.
2.3.2
Safety temperature limiter for immersion heater (STL)
The STB protects the hot water installation from
excessive temperature increases.
When the preset switching value (99 °C) is exceeded, the
immersion heater is switched off.
The immersion heater cannot be restarted unless the hot
water temperature has fallen to
≤
90 °C and the reset
button (Fig. 2) on the STB has subsequently been
pressed (may be performed by qualified personnel only!).
Fig 2: Resetting STL
2.3.3 Temperature controller for immersion heater (TC)
The temperature controller for the immersion heater controls the temperature of the water for domestic use during
the immersion heater mode of operation. The maximum temperature of this controller has been factory-set to 65 °C
(the controller is installed with the STL in a common casing). The temperature setting can be changed with the aid
of a suitable tool (see Fig. 2). Changing this setting may be performed by qualified persons only!
In the immersion heater mode, which can only be turned on manually, the domestic water is heated up to the
preset maximum temperature of the immersion heater.
2.3.4 Temperature controller of HPCDW
Temperature control in the domestic water storage tank and the control of the compressor operation is taken over
by the temperature controller. The latter senses the water temperature by means of a sensor and regulates it as a
function of the preset setpoint. The desired temperature level (setpoint) can be adjusted via the dial on the
operating panel.
85°
30°
B3
F2
STB
Partition
Panel
Reset button
