Boiler Bivalent Control - Panasonic WH-MXC16J9E8 Service Manual

13.20.2 Solar Operation Control

Solar function can only be activate if the solar function selection "YES" from remote control. To achieve hot water
from solar panel, indoor need to control the solar pump and circulate hot water from solar panel.
Under normal case:
Solar pump start condition:
o
 Solar panel temperature > Delta T turn on setting temp (R/C) + Tank temperature (depend on selection,
DHW or Buffer) AND
 Tank temperature (DHW or Buffer) < Solar HI Limit Temp (R/C) AND
 Operation ON with heat mode (apply to solar connect to "Buffer Tank" case)
* Condition c) ignore if the solar system is connect to DHW tank (control active under operation OFF time for
Tank connection case)
Solar pump stop condition:
o
 Solar panel temperature < Delta T turn OFF setting temp (R/C) + Tank temperature (depend on selection,
DHW or Buffer) OR
 Tank hot water temp >= Solar HI Limit Temp (R/C) + [2]°C
Under solar Anti-freeze protection control:
Solar pump start condition:
o
Outdoor temp < Outdoor temp setting for Anti-Freeze (R/C)

Solar pump stop condition:
o
 Outdoor temp > Outdoor temp setting for Anti-Freeze + [2]°C
**However, During Cool mode this function cannot activate if Tank selection is "Buffer Tank".
**Solar pump can operate even if Heat pump is under error stop.

Solar operation during error:
During Tank sensor (DHW or Buffer depend on selection) abnormal, Solar operation will not able to function.
o
During Solar Panel sensor detect OPEN (not include SHORT), Solar operation will not able to function too.
o

13.21 Boiler Bivalent Control


Boiler is an additional or alternative heat source to heat up the room when necessary.

Purpose of this control is to turn ON and turn OFF the Boiler output signal when boiler heating capacity needed in
the system.

Boiler is possible to connect to DHW Tank and Buffer Tank depends on the installer.

Boiler operation parameter need to be set on Boiler itself, indoor do not control the boiler operation direction and
operation.

There is two option of control pattern can be set by remote controller : AUTO OR SG ready Mode
AUTO Control Mode:

There are Alternative mode, Parallel mode, & Advance Parallel mode available to select by installer to fit to the
total system.
Bivalent control selection by remote controller
Remote control setting value:
1 Outdoor Ambient Set = (Range: -15°C ~ 15°C)

Alternative Mode
Only one heat source operates at one time, either heat pump or boiler depends on condition.
o
External pump will turn ON when the external pump selection is ON when boiler is ON even heat pump is
o
OFF.
Control detail:
During Operation ON at Heat mode or Tank mode or Heat + Tank Mode
Boiler signal turn ON and heat pump and water pump turn OFF when:
o
 Outdoor ambient < Outdoor Ambient Set AND
 Boiler prohibit flag = 0
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