Hitachi RHUE-3AVHN, Руководство по обслуживанию

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Controller pack
Service Manual
80
System configuration, settings and control system
SMGB0066 rev.0 - 12/2009
4.1.11. Bi-Valent System - Parallel operation - Mixing loop (Conf 4)
Summary •
This is a bivalent system where the boiler is configured in parallel with the heat pump. A hydraulic separator or buffer
tank has to be used to ensure proper hydraulic balancing. This system is recommended for retrofit (upgrade) applications
where an existing gas/oil boiler will be retained to provide the full heating requirements on the coldest days of the year.
Important Parameter Settings •
CONF = 4
P4 = heating curve according to building and system characteristics.
DHW tank control is not possible with this system.
It is also recommended to review all parameter settings, and make modifications as required by the installation.
• Example
Bi-Valent System with DHW & mixed heating loop.
Hydraulic separator or buffer tank.
CONF=4 Bi-valent Parallel system
4.1.12. Bi-Valent System - Serial operation (Conf 5)
Summary •
This is a bivalent system where the boiler is configured in series with the heat pump. A hydraulic separator or buffer tank
has to be used to ensure proper hydraulic balancing. This system is also used for retrofit (upgrade) applications, but
operates like the mono-energetic system using the gas/oil boiler, similarly to the electric heater, in series with the heat-
pump. The boiler only needs to provide the additional peak load capacity
Important Parameter Settings •
CONF = 5
P1 = 0,1,2 according to DHW system type.
P4 = heating curve according to building and system characteristics.
It is also recommended to review all parameter settings, and make modifications as required by the installation.
• Example
Bi-Valent System with DHW.
Serial operation with bypass/mixing valve.
DHW controlled by diverting valve
Hydraulic separator or buffer tank.
CONF=5 Bi-valent Parallel system
P1=1 DHW valve