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Advanced manual
21
3.5.8. SETTINGS
WATER HEATER
Pump start temp
– setting for the temperature limit, that
forces the pump to continuous operation for initial freezing
protection
Range: -10..20
Default: 5
Pump kick
– timer that forces the circulation pump to
run for short period of time (30s) in speci
fi
ed intervals.
That prevents the mechanical sealings from sticking and
damage.
Range:
No - function disabled
Day - function activated daily
Week - weekly
Month - monthly
Back water setp
– setpoint for back water temperature
regulator. Special PI regulator works in two operating
modes. First is normal heating mode, when the AHU is
working. Regulator prevents the back water from dropping
below the temperature limit.
Note!
Main temperature has got lower priority than back-
water control!
Second mode is anti-freezing protection, when the AHU
is stopped in Off mode. The regulator maintains the back
water temperature equal to the setpoint value, in order to
prevent returning too hot water to the boiler system.
Note!
Back-water control functionality is optional and must
be enabled in Configuration mode of the controller.
HMI ADVANCED
WATER HEATER
Pump start temp
5,0°C
Pump kick
Day
Back-water setp
40,0°C
3.5.9. SETTINGS
INIT HEATING
T
1
– lower scaling external temperature
T
2
– upper scaling external temperature
Y
1
– heating rate at T1 temperature
Y
2
– heating rate at T2 temperature
t_a
- time to force the valve to 100% opening, regardless to
the external temperature, in order to
fi
ll the pipeline with the
hot water
t_b
– time the unit stays with calculated heating rate
Note!
Total time is t_a + t_b . These settings are common
for initial heating of pre-heater and secondary heater, if both
are present in the AHU.
HMI ADVANCED
INIT HEATING HW
Y2 75%
Y1 25%
T1 -25°C
T2 5°C
t_a 30s
t_b 60s
