Alfa Laval Mini City
Installation and operating
12
Installing the outdoor temperature sensor
2.12
Connect the outdoor temperature sensor to the connection box.
With a conductor area of 0.6 mm
2
the maximum cable length is 50 metres, maximum
5Ω/conductor.
If the outdoor temperature sensor is connected at a later time, for example in a
construction period, the room thermostat must be restarted.
Control mode 2 and 3 requires an outdoor temperature sensor.
Starting up sequence for AL Mini City with component check
2.13
Note:
The substation must be filled with water before starting the room thermostat, if not
the pump can be damage.
The room thermostat controls the supply temperature to the heating system. The room
thermostat is pre-set to use control mode 2, Outside Temperature Control (OTC control).
1)
Put the electrical cable from the control panel into a wall outlet.
2)
We recommend using an earth fault breaker.
3)
A check of the actuator and pump function starts.
During start-up sequence, the components manoeuvres by the following schedule:
•
10s actuator closes
•
10s actuator opens
•
10s actuator closes
•
10s pump runs
•
150s actuator closes.
The valve is completely closed; it will be closed for the run time. The pump is
switched on and for the next 5 minutes a supply temperature of 37°C is
controlled.
4)
When start-up sequence is completed the room thermostat returns to last set control
mode.
Note
: If there is no heat demand the pump stops after the start-up sequence.