hajdu HPT300, Installation, Operating And Maintenance Manual, Page: 74 / 156

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HPT 300 • HPT 300C
fluid and the free source, an aluminium pipe heat exchanger is placed outside the
HPT300(C) heat pump water heater, which enables to heat sanitary water up to a tem-
perature of max. 60°C in normal usage conditions. As the HPT300(C) heat pump wa-
ter heater has been equipped with a supplementary pipe radiator providing further
options: quicker achievement of full capacity operation by combining the heat pump
mode and pipe radiator mode up to a temperature of max. 60°C. This may be utilised
in the course of antibacterial protection cycles even. In order to ensure sensible energy
use during the operation of the hot water tank, visual signals warn the user, if the ap-
pliance is not operating in the most efficient way, e.g. when the pipe radiator is active.
3.3. Water heating methods
The appliance operates using two types of power source. As a standalone heat pump
and/or using the electrical pipe radiator. Models HPT300 C and C1 incorporate a heat
exchanger pipe coil (for model HPT300C). Hot water tank of type HPT300C can be used
with multiple energy sources: indirectly from solar energy, or gas-based, coal-based or
other energy carriers; furthermore, the auxiliary electric heating provided by appliances
of type HPT300(C) is controlled by the heat pump unit. All of the three heating functions
can be used simultaneously.
This appliance has two temperature sensors that are placed in the upper flare located
on the closing cover and in the lower flare. The sensor placed in the upper pocket tube
measures the upper temperature, and this number is displayed by the Water temp in-
dicator, while the sensor placed in the lower pocket tube monitors the lower tempera-
ture, which serves as input data for switch on/ off, but is not displayed.
1.) Economy mode (ECO):
In this mode, only the heat pump operates, as a result of pre-set water tempera-
ture, and the electric heater is not enabled. (The water temperature is 38 to 60 °C at
the outlet, while the temperature of the operating environment is -4 to 43 °C)
2.) Hybrid Mode:
In this mode, the equipment splits its operation capabilities to electric heating and
heat pumping, based on the temperature of the water tank. (The water temperature
is 38 to 60 °C at the outlet, while the temperature of the operating environment is -20 to
43 °C)
3.) E-heater Mode:
In this mode, the motors of the compressor and the fan do not work, only the elec-
tric heater operates. In this case, only water located in the upper part of the tank is
heated, which means approximately 100 l. (The water temperature is 38 to 60 °C at
the outlet, while the temperature of the operating environment is -20 to 43 °C)
4.) Defreezing through water heating:
In case of Economy Mode and Hybrid Mode, if the evaporating steam freezes in
cold environments, the appliance defreezes it automatically to ensure efficient per -
formance (3 to 10 min).