Section 7. Professional Maintenance; And Service; Heat Pump Design; Heat Pump Components And Operation - Jandy EE-Ti Manuel D'installation Et D'utilisation

Jandy Heat Pump Models EE-Ti Installation and Maintenance Manual
position. Turn the heat pump back ON. The heat
pump must not come on.
3. Inspect the electrical controls, specifi cally the
following:
a. High and Low limits
b. Pressure switch
c. Temperature control
4. Inspect the evaporator coil for blockage and clean
as necessary.
5. Check for spider webs or debris in the condensate
drain; clean if necessary.
6. Conduct a normal operating cycle and observe that
the unit operates properly.

Section 7. Professional Maintenance

and Service

7.1

Heat Pump Design

The Jandy heat pump is one of the most efficient
ways to heat a pool or spa. The heat pump transfers heat
from the outside air to the pool or spa water by means
of an internal heat exchanger.
When the fan is turned on, warm air is drawn
through the refrigerant charged evaporator, turning
the cold liquid refrigerant to a warm gas. The gas then
flows through the compressor where it is compressed
resulting in a much higher temperature.
The hot gas enters the heat exchanger where the
water extracts the heat. The pump pulls in cool pool
water, which in turn converts the hot gas back into a
liquid refrigerant and starts the cycle over again.
The EE-Ti heat pump uses a refrigerant called
R-410A. It is a non-ozone depleting refrigerant that
is accepted by the EPA. R-410A has higher operating
pressures and cooling capabilities than R-22, which is
the refrigerant used in the AE-Ti heat pump. Therefore,
R-410A should NEVER be used in any of the AE-Ti
heat pumps.
The EPA does not require certification to purchase
or use R-410A. It is recommended that service
personnel be trained in installation, service, brazing, and
maintenance procedures. They are similar to what the
industry has used for the R-22 system, however, they
should be redefined for the higher operating pressures.
NOTE The maximum heat output and effi ciency of
a heat pump is dependent upon the quality
and performance of the major components
used. Equally important are the environmental
conditions (for example, air temperature,
humidity, water temperature, and wind).
7.2 Heat Pump Components and
Operation
Evaporator - As air passes through the evaporator, the
refrigerant in the evaporator absorbs heat from the
ambient air. The warmer the ambient air and the
larger the surface area of the evaporator the more
heat it can collect.
Fan - The heat pump fan produces high volume airfl ow.
Adequate airfl ow is required to move warm air
through the large evaporator.
Compressor - The compressor compresses the
refrigerant gas to a higher pressure, increasing the
temperature.
Heat Exchanger - As the fi nal step to the heating
process, the heat exchanger transfers the heat
from the hot gas to the water. (Also known as a
condenser.)
Reversing Valve - (For Hybrid Units with Optional
Chiller and Hot Gas Defrost) The reversing valve
reverses the fl ow of the refrigerant, which results
in transferring cold gas to the water, thus lowering
the temperature.
COLD AIR OUT
WATER
WATER
OUTLET
INLET

Figure 17. Heat Pump Operation Overview

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FAN
EVAPORATOR
COIL
WARM AIR IN
TITANIUM HEAT
EXCHANGER
COMPRESSOR