tekmar 664 Snow Detector & Melting Control Installation - Manual (Page 14)

14 of 36 © 2009 D 664 - 07/09
Section F: Idling Operation
Section F1
General Idling
Operation
Section F1: General Idling Operation
When the snow melting system starts from a cold temperature, the time required for the zone(s) to reach its melting temperature may
be excessive. To decrease this start up time, the 664 has an idling feature which can maintain the zone(s) at a lower temperature. This
feature is also useful for preventing frost and light ice formation. The IDLE 1 and the IDLE 2 settings in the ADJUST menu sets the slab
surface temperatures of zone 1 and zone 2 respectively while the control is in the Idling mode. When in the Idling mode, IDLE 1 and / or
IDLE 2 is displayed in the STATUS item of the appropriate zone while in the VIEW menu. If idling is not desirable, the IDLE 1 and / or
IDLE 2 settings may be set to OFF.
IDLING WITHOUT PRIORITY
If the PRIORITY item is set to NONE, both zone 1 and zone 2 can utilize the idling feature.
IDLING WITH PRIORITY
If the PRIORITY item is set to COND or FULL, only zone 1 can utilize the idling feature. Therefore, the IDLE 2 item in the ADJUST
menu is not available.
The temporary idle allows the control to enter the idle state for a set amount of time. If the snow ice detector does not detect snow
during the temporary idle period, the control then leaves the idle state and returns to the OFF state. This is useful in applications
where there is the possibility of snow and the slab can be pre-heated in order to have a short heat up time if snow is detected.
To enable a temporary idle, the Temporary Idle setting in the ADJUST menu must be set from OFF to the length of the temporary idle.
The DIP Switch must be set to IDLE DEMAND and the IDLE 1 or IDLE 2 settings must be set to a temperature. To activate a temporary
idle, a voltage between 24 and 240 V (ac) must be applied across the Melt/Idle Demand terminals for at least 4 seconds.
When a Temporary Idle time is selected, the control has three available states: OFF, Temporary Idle, and Melting. The table below
describes the action of the control:
Control State Action Result
OFF External Idle Demand Temporary Idle
OFF Manual or Auto Melt Start Melting
Melting External Idle Demand Melting
Melting Manual or Auto Melt Start Melting
Melting Manual or Auto Melt Stop OFF
Temporary Idle Temporary Idle Expires OFF
Temporary Idle Manual or Auto Melt Start Melting
Temporary Idle Manual Melt Stop OFF
Section F2
Temporary
Idle
Section F2: Temporary Idle (TMPY IDL)