© RESOL 09005 HMK2.monen.ind
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HKM2
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3.1.16 Manual operation
The heating circuit and the heating circuit pump can be
switched on or off manually with the manual control
switch. In order to operate the HKM module at full ca-
pacity the manual control switch should be set to “Auto”.
With the help of parameter MM the relays can be switched
in different states:
MM0 = R1 on, R3 on
MM1 = R1 on, R2 on
MM2 = R1 on
Adjustment range: “0”, “Auto”, “I”
Factory setting: “Auto”
3.1.17 Operating control lamp - flashing codes
Constantly green: OK
Flashing red:
Error
Sensor fault
5. Tips for fault localisation
4. Commissioning
Please connect the power supply at first. The HKM2 mod-
ule passes through an initialisation phase during which the
operating control lamp is flashing.
Afterwards the module switches back to the normal mode
and indicates the flow temperature FL and the flow set
temperature FS.
If the heating circuit module does not work faultlessly, please
check the following points:
1. Power supply
If the operating control lamp is off, please check the power
supply of the controller.
The HKM2 is protected by a can fuse T4A which is accessible
and can be replaced by opening the cover of the housing
(spare fuse is enclosed in the accessory bag).
2. Manual control switch
For faultless use of the control of the HKM2 module the
manual control switch should be set to “Auto”.
3. Sensor faults
If there is a malfunction caused by a sensor defect, it is
signalled by the operating control lamp flashing red and the
symbol
being displayed. An error code for the affected
sensor is shown on the display. For checking the 3rd tempe-
rature sensor the pushbutton 1 must be pressed once.
Short-circuit:
Short-circuit of a sensor cable with
indicaton of the respective temperature
sensor. The error code -888.8 is shown
in the display.
Broken cable:
Broken sensor cable with indication
of the respective temperature sensor.
The error code 888.8 is shown in the
display.
Disconnected PT1000 temperature sensors can be checked
with an ohmmeter. Please check the resistance values cor-
respond with the table to the left.
Resistance values of
the Pt1000-sensors
