STIEBEL ELTRON Heat pumps, Technical Manual

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aIr | watEr HEat pUmpS wpl 13/18/23 E/cool
Appliance description WPL..E
Air | water heat pump with low
space requirement through compact
design for optional internal or
external installation. the metal
enclosure is zinc-plated and finished
in a white stove enamel. the booster
heater is fitted as standard to enable
mono-energetic operation and high
DHw temperatures. the evaporator is
defrosted by reversing the cycle. the
electronic expansion valve optimises
the coefficient of performance over
the entire application range. the
heat pump is filled with CFC-free
r407 C refrigerant. the heat pump is
controlled via a bUs cable.
A
t a glance
 For fully automatic heating
water heating up to +60 °C flow
temperature

suitable for underfloor heating
systems and systems with
radiators; low temperature
heating systems are preferred, as
these achieve a higher coefficient
of performance
 extracts energy from the outside
air, right down to -20 °C outside
temperature
 Comprises all components
required for its function and
safety
 Central control of the heating
system and safety functions
through the heat pump manager
(essential accessory)

Corrosion-protected, external casing
panels made from zinc-plated
sheet steel with a stove enamelled
finish; internal airways made from
corrosion-resistant aluminium sheet
 Compact design, therefore modest
space requirements for internal or
external installations
 test symbol of independent test
bodies (see type plate)
 Contains non-combustible r407C
safety refrigerant
Function
Heat is extracted from the outside air
at temperatures ranging from +40 °C
to –20 °C by the heat exchanger on
the air side (evaporator). Heating
water is heated in the heat exchanger
on the water side (condenser) to
levels set at the control unit (from
+15 °C to +60 °C) by heat from
the electrical power used by the
compressor. At air temperatures
below approx. +7 °C, the humidity
in the air precipitates as hoarfrost
on the evaporator fins. Any hoarfrost
is automatically defrosted. water
created from this defrosting collects
in the defrost pan and is drained
off via a hose. the fan is switched
oFF and the heat pump circuit is
reversed to activate the defrost cycle.
the energy required for defrosting
is drawn from the heating system.
the heat pump automatically reverts
to heating mode at the end of the
defrost cycle.
Safety and quality
Appliance description WPL..cool
Air | water heat pump with low
space requirement through compact
design for optional internal or
external installation with cooling
function. the metal enclosure is
zinc-plated and finished in a white
stove enamel. the booster heater is
fitted as standard to enable mono-
energetic operation and high DHw
temperatures. the evaporator is
defrosted by reversing the cycle. the
electronic expansion valve optimises
the coefficient of performance over
the entire application range. the
heat pump is filled with CFC-free
r407 C refrigerant. the heat pump is
controlled via a bUs cable.