Protective Function - Fujitsu NEORE B User Manual Installation Instruction

14. PROTECTIVE FUNCTION

Protective
function
Freeze Static (output water
protection temperature lower than 5°C)
During operation (adjustable
in service access)
Flow control Flow monitoring by outdoor
unit power
Critical flow monitoring
200 l / hr
Flow change during defrost
and cooling
Water pressure Heating / cooling water
control pressure control
(adjustable in service access)
Description
If the indoor unit is connected to power
supply, output water temperature
is monitored. When it is lower then 5°C,
so circulator and first stage of bivalent
(2 kW) are switched ON. When temperature
exceeds 5°C, protection is switched OFF.
This protection is active also when heating /
cooling is not switched ON. Protection is solid
and works only when indoor unit is connected
to power supply and breaker of technology
is switched ON. Outdoor unit is not used.
When during heating temperature become
lower than set temperature (15°C default),
outdoor unit is shut down. Output water
heating takes over bivalent source. After
exceeded output water temperature of 15°C,
bivalent source continues in heating for
another 30 minutes. Then heating control
continues in the usual manner. This protection
is mostly activated when defrost and water
flow is insufficient (eventually when is low
energy accumulated inside of system).
For compliance declared effectivity
and ensuring safe operation sufficient water
flow is necessary. Minimal water flow
is defined by relationship among outdoor unit
power and required power of circulator.
Values of minimal water flow are in graph
of minimal water flow for different types of
units on page 32.
If during circulator operation water flow falls
below 200 l/hr (fixed value), critical error
is signalized and automatic circulator bleeding
program is started. Bleeding occurs
cyclically,10 seconds stop, 10 seconds 100%
of power until water flow is restored.
During defrost is water flow automatically
increased to 100%. When cooling, circulator
is not controlled proportionally, but always
running at full capacity 100%.
If water pressure falls below defined level,
critical error is signalized and heat pump
operating is stoped.
34
Note /
variable
T freeze
protect
- service
access
Error autoreset
max. 5 times
Outdoor unit
power
- service
access
Error autoreset
max. 5 times
Min. water
pressure
- service
access
Error autoreset
max. 5 times