Flexible Domestic Hot Water (Dhw) Control - Hitachi RWM-(H)FSN3E Technical Catalogue

2 Features and benefits
• Boiler combination: When the unit is not able to provide the necessary heating capacity in low ambient temperature
conditions, it will be stopped and the boiler starts to operate providing the necessary heating capacity. The unit should
be sized in order to operate mainly with the air to water heat pump, and boiler will be only activated in low ambient
temperature conditions.
Boiler for emergency mode (Optional function): In case of outdoor unit malfunction, the heating required can be
-
provided by the boiler.
• Boiler + electric heater: The unit will normally operate with air to water heat pump and the supplementary heating
required will be supplied by the electric heater. The boiler will only operate when the air to water heat pump + electric
heater cannot reach the required heating capacity in conditions of very low ambient temperature.

2.5.2 Flexible Domestic Hot Water (DHW) control

An optional Domestic Hot Water Tank (DHWT accessory) can be connected to the air to water heat pump in order to pro-
vide the Domestic Hot Water operation. The DHWT is available in four models 200/300 liters enamelled/stainless, with an
integrated electric heater of 2.5 kW.
N O T E
Fore more details, please refer to the Installation and Operation manual (PMML0198A).
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TCGB0070 rev.3 - 04/2012
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Air to water
heat pump
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