tekmar 654 Snow Melting Control Installation - Manual (Page 42)

© 2013 654_D - 06/13 42 of 44
Symptom Look For... Corrective Action
LCD display is
off
Power to control
Use electrical meter to measure 24 V (ac) voltage on input power R and C
terminals.
System pump
always on
Display shows Idle
Idle operation requires that the system pump operate continuously while below the
melting temperature setting.
Blue short
Dirt or salt on snow/
ice sensor The snow/ice sensor requires regular cleaning. Avoid using road salt on the snow
melting slab.
Slab is
above melt
temperature
Slab Target The slab is heated to the slab target.
Heat On not shown
Check wiring of the system pump. The system pump operates continously during
melt, idle or storm operation. The heat source must be wired to operate together
with the heat relay.
System running
with no snow
Idle Idling heats the slab when the temperature falls below the Idle temperature.
Melt
During cold weather cut out (CWCO), the system is shut off. If shut off during a
melt cycle, the system resumes melting once the outdoor temperature is above
CWCO.
Timed Melt System manually started.
Sched Melt System started on a programmable schedule.
Snow on slab
but system did
not start
Off System has a programmable schedule and is in event 2 or 4 (unoccupied).
Off
System has been manually Stopped and the automatic snow / ice sensor never
dried, thereby preventing the system to automatically start.
Frequently Asked Questions
Item Setting
EVENT 1
EVENT 2
EVENT 3
EVENT 4
Schedule Menu Settings
Item Setting
SCHEDULE
EVENT PER DAY
24 HOUR / 7 DAY
Job Record
Item Setting
UNITS
Display Menu Settings
Item Setting
BACKLIGHT
Item Setting
SCENES
Scene Menu Settings
Item Setting
AWAY KEY