4
Output
Combi 185 can, in the course of 24 hours, heat 380 litres of
domestic water to a temperature of 55 °C. This can, of
course, vary depending on the temperature of the heat
source, the temperature of the cold water and the drainage
pattern. The integrated electric immersion heater, which
has an output of 1 kW, can be engaged at peak loads. The
Combi 185 only consumes approx. 30% of the electric en-
ergy that would be consumed by a directly heated tank.
Coolant Circuit
The coolant circuit is a self-contained circuit where the
R134a HFCKW-free coolant acts as energy carrier.
Heating Module
Heat in the air is removed by the condenser at low evaporat-
ing temperatures and transferred to the coolant. The cool-
ant is sucked out in the form of steam by a compressor and
compressed at a higher pressure/temperature and then
transported to either the domestic water heater of the con-
denser, and/or its supply air duct. The energy which the com-
pressor has pumped into the coolant and the part of the en-
ergy that comes from the condenser are transferred here to
either the water or the air that is being heated. In the pro-
cess, the coolant condenses and reverts to a fluid state.
The high pressure in the coolant subsequently goes through
an expansion valve where it is reduced, and the coolant can
once again absorb heat from the extract air via the
evaporator.
Process
The control unit (Optima 312) starts the compressor
shortlyafter hot water starts to be used and as soon as the
sensors detect a temperature drop in the tank. The com-
pressor runs until the entire tank has once again reached
the set temperature.
The Combi 185 will normally be able to satisfy the needs
for hot water of an entire family. If a situation comes where
the Combi 185 is not able to produce enough hot water, the
immersion heater in the tank can be activated manually via
the control unit.
This will make it possible to produce double the amount of
hot water. The immersion heater can be set to the desired
heating temperature of the water in the upper section of
the tank. (Only use the immersion heater at peak loads as it
consumes more energy than the compressor).
Defrosting
When the temperature difference between the temperature
prior to the cooling coil and the temperature of the cooling
coil itself becomes too large, which occurs when there is ice
formed on the cooling surface, the unit will begin to defrost.
The supply air ventilator and the electric heating coils will
disengage. The discharge air ventilator will continue to run
together with the compressor, which will send hot gas direct-
ly into the evaporator until the ice melts and the cooling coil
reaches a temperature of around 5 °C, depending on the tem-
perature that has been set in Section 50. The supply air fan
and the electric heating coil will then re-engage.
Scope of Delivery
• Combined ventilation unit and domestic water heat pump
with a control unit.
• Installations Instructions and Instructions for use
Accessories
• Replacement filters
• Temperature sensor for solar cells/central heater/
geothermal pipes
• Electric preheater
• Electric or water-based reheater
• Anode
