
General
This accessory is used for VVM 500 indoor module to
enable connection and control of external additional
heat as follows:
႑Oil boiler
႑Immersion heater/electric boiler
႑Gas boiler
႑Prioritised additional heat
The heat is used to heat the building and the hot water.
Normally additional output is provided by the immer-
sion heater in VVM 500 in the event that the heat pump
output is not sufficient. With the alternative above this
additional output is provided using external additional
heat. If the power is not available in the external addi-
tional heat, the immersion heater in VVM 500 is auto-
matically engaged.
Prioritised additional heat refers to heating from an
external, non-controlled heat source which, if available,
is prioritised to be used before the heat pump. An ex-
ample of prioritised additional heat would be a wood
fired boiler or back boiler.
In order to dock external additional heat, the indoor
module must be supplemented with two docking pipes,
which are included in the docking kit DEH 500.
NOTE
When this accessory is installed and activated
the temperature in the indoor module vessel
is limited to about 85 °C. Therefore, temperat-
ure settings regarding hot water or heating
must not exceed 85 °C.
Contents
Heating pipe paste2x
Angle connection2x
Insulation pipe1x
Insulation tape1x
Unit box1x
Aluminium tape2x
Cable ties4x
Temperature sensor1x
Copper pipe2x
Cover discs2x
Component positions
LEK
AA5-X4
AA5-S2
AA5-X2 AA5-X9 X1
FA1
AA5-F1AA5
Electrical components
Miniature circuit-breaker. 10AFA1
Terminal block, power supplyX1
Accessory cardAA5
Terminal block, sensors and external
blocking
AA5-X2
Terminal block, communicationAA5-X4
Terminal block, circulation pump, mixing
valve and auxiliary relay
AA5-X9
DIP switchAA5-S2
Fine wire fuse, T4AH250VAA5-F1
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
10
English, Installer manual - DEH 500
GB