KJM MANDÍK
–
Detailed operating instructions
M&C KJMPNO 07/2022
MANDÍK, a.s.,
36
preferably via an open contact. When the emergency frost protection is activated, the fans are
switched off, mixing damper is opened to 100%, pump is switched on, three-way valve is opened
to 100%, and a fault is signalled.
Operational frost protection
is performed based on return water temperature, outdoor
temperature, and supply air temperature in the following cases:
1.
When the unit is switched on, the heating water temperature drops below´6 °C (
TempWtr
)
–
pump switches on, and the three-way valve opens to 100%. The frost protection stops if the
temperature rises above 7 °C.
2.
When the unit is switched on, the supply air temperature falls below 6 °C (
SplyTemp
)
–
pump switches on, and the three-way valve opens 100%. The frost protection stops if the
temperature rises above 7 °C.
3.
When the unit is switched off, the heating water temperature falls below 10 °C (
TempWtr
)
–
pump switches on, and the three-way valve opens. The three-way valve opens fully at 4 °C.
Between 4 °C and 10 °C, the valve position is linearly dependent on the temperature of the
discharged water. The frost protection stops if the temperature rises above 10 °C.
4.
Based on the
PumpOn
selection, the pump can be switched on at a low outside air
temperature with the unit switched off or on (
TempOut
)
.
´Frost protection is indicated as
AuxilieryMode
–
ProtectWaterHeating
on the controller display in
the main menu.
Any failure of the water heating will open the three-way valve to 100% and turn on the
pump. If the unit is running during a water heating fault, then the fan speed may be reduced
when
ComponentsMachine
Fans
HeatErr
=
Compensation
is set. This condition is indicated
as
AuxilieryMode
–
CompenssationSpeed
on the controller display in the main menu.
Additionally, the water heating fault counts are displayed after user login.
State
– displays information about the water heater operation.
Ready
– water heating is switched off.
Heat
– water heater is heating.
Humidity
– water heater is heating to reheat dehumidified air.
TempOut
– heating water temperature is low, pump is on.
TempSup
– supply air temperature low, heater is on.
