Control Features; Flexible Space Heating/Cooling Configuration And Control - Hitachi RWM-(H)FSN3E Technical Catalogue

2 Features and benefits

2.5 Control features

2.5.1 Flexible space heating/cooling configuration and control

N O T E
• The air to water heat pump is pre-configured to work only in heating mode. In order to allow the cooling mode,
it is necessary to perform a dip-switch setting and install the drain pan accessory. In the case, all the cooling
mode uses for the unit will be permitted and the LCD user's interface cooling configuration will appear.
• For the detailed information, please refer to the Service Manual (SMXX0070).
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Many available system configurations
As mentioned before, the new air to water heat pump allows the control of a large variety of configurations.
N O T E
For the detailed information, please refer to the section Installation
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Second water temperature control
New air to water heat pump allows the water temperature control of two zones with different required temperatures (radia-
tors + heating floor for example) by means of the 2nd Temperature Room Thermostat (as accessory).
The mixing valve is controlled to maintain the second supply temperature at the second temperature set-point. The system
control then decides how much to open or close the mixing valve to achieve the desired position for the valve.
N O T E
High temperature must be the direct circuit and low temperature must be the second circuit.
44
TCGB0070 rev.3 - 04/2012
Second temperature
control
To heat pump system
control
Zone 1
system
Hydraulic
separator
To heat pump
configurations.
Zone 2: Low temperature
Secondary
water pump
Motorized
3-way valve