Relay or analogue output
A relay output can be used when long cycle times are permitted. If fast pulsing is required, the AO1/PWM output
can be used. The output must be connected to an external power solid state relay. The cycle time must be
congured for the relay output in o43 or for analogue output in P82.
Pulse control according to day and night
Various ON periods can be set for day and night operation. A cycle time is set as well as the percentage part of the
period in which the rail heat is ON.
Figure 17: Rail heat control, day/night load
Pulse control according to dewpoint
In order to use this function, a system manager of the type AK-SM is required which can measure ambient
temperature and humidity to calculate dew point and distribute to the appliance controllers. For this the rail heat’s
ON period is controlled according to the distributed dewpoint.
Two dew point values are set in the appliance control:
• One where the eect must be max. i.e. 100%. (o87)
• One where the eect must be min. (o86)
At a dewpoint which is equal to or lower than the value in 086, the eect will be the value indicated in o88. In the
area between the two dew point values, the controller will manage the power to be supplied to the rail heat.
Figure 18: Rail heat control, dew point
Danfoss
84B2729
o88
o86
100%
o87
During defrosting
During defrosting rail heat can be selected to be OFF, ON or run normal control as selected in setting d27.
Fan pulse control
To obtain energy savings, it is possible to pulse control the power supply to the evaporator fans.
Pulse control can be accomplished in one of the following ways:
• during the thermostat’s cut-out period (cold room)
• during night operation and during the thermostat’s cut-out period (appliance with night blinds)
AK-CC55 Multi Coil
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