Swimming Pool Combination Control; Flexible Water Pumps Control; Other Optional Functions - Hitachi RWM-(H)FSN3E Technical Catalogue

2 Features and benefits

2.5.3 Swimming pool combination control

The swimming pool operation has the lowest priority of the system and only will be possible when space heating/cooling
and DHWT are not required.
When the swimming pool operation is required, the swimming pool pump starts to operate giving the swimming pool
pump feedback. In this situation, the 3-way valve of the DHWT is not activated and the 3-way valve for the swimming pool
changes its normal position diverting to the swimming pool heat exchanger, allowing to heat the swimming pool water to
a confortable value.
N O T E
For more information, please refer to the section Installation

2.5.4 Flexible water pumps control

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Two different water pump modes
The pump control can be set to standard or economic mode.
• Standard mode: Pump will always be in operation when space heating/cooling is enabled, but when space heating/
cooling is disabled using LCD user's interface or Thermostat OFF (intelligent thermostat only), pump must be swit-
ched OFF and only will be switched ON by DHW heating request.
• Economic mode: When the system has reached the required temperature, or the system is stopped, the water pump
will be stopped (using the thermostat; no other operation is required).
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Pump and motorized valve seizure protection (Optional function)
This function helps to prevent these components from sticking during long periods of inactivity by running every week the
components during a short period.

2.5.5 Other optional functions

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EJP input (Electrical tariff input)
This function allows an external tariff switch device to switch OFF the heat pump during peak electricity demand period.
Depending on the setting, the heat pump or DHWT will be blocked when signal is open/closed.
Additionally, it's possible to set that the boiler or the DHWT heater will be enabled instead heat pump when EJP Mode ON.
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Automatic summer switch-OFF
The system will switch OFF the heating mode when the daily average outdoor temperature of the previous day rises above
certain value at the summer switch-OFF activation temperature.
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2nd. outdoor temperature sensor (Accessory)
In the cases where the outdoor unit is installed into a location where its own outdoor ambient temperature sensor can not
give a suitable temperature measurement to the system, it is available the 2nd. outdoor ambient temperature sensor as
an accessory.
So, the 2nd. outdoor ambient temperature sensor shall be located in a proper place for getting most representative outdoor
ambient temperature.
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Available four external outputs signals for optional functions
There are available four output optional signals that provide four optional functions of the system, programmed on the
indoor unit PCB.
N O T E
In order to make easy the electrical connection works, HITACHI offers (as accessory) a relay board for the addi-
tional output signals.
For more information about the Optional functions, please refer to the Service Manual (SMXX0070).
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TCGB0070 rev.3 - 04/2012
configurations.