Install Instructions

ManualsBrandsTekmar ManualsHeating SuppliesSnow Melting Control

Warm Weather Shut Down

Cold Weather Cut Out

During warm weather, the slab is warm enough to naturally

melt snow or ice. The control has a Warm Weather Shut

Down (WWSD) setting in the Set Temp menu that prevents

the control from entering Melt, Idle or Storm operation in order

to conserve energy. The control shows WWSD on the display

when WWSD is in effect.

Automatic (Auto)

The control enters WWSD when both the slab temperature

of a zone and the outdoor temperature exceed the Melt

temperature setting by more than 2°F (1°C).

Manual WWSD

The control enters WWSD when the outdoor air temperature

exceeds the WWSD setting by 1°F (0.5°C) and when the

slab temperature exceeds 34°F (1°C). The control exits

WWSD when the outdoor air temperature falls 1°F (0.5°C)

below the WWSD setting or if the slab temperature falls

below 34°F (1°C). This allows the Melt temperature setting

to be set higher than the WWSD. This is useful when high

slab temperatures are required to melt the snow or ice. An

example of this are installations using paving bricks on top

of sand and concrete layers.

Maintaining the melting or idling temperature during extremely

cold temperatures is not only expensive but may be impos-

sible if the heat loss of the slab exceeds the input capacity

of the heating plant or electric cable. When the outdoor air

temperature drops below the Cold Weather Cut Out (CWCO)

temperature and the slab is below freezing, the control does

not operate the boiler but the system pump continues to run.

This is a safety and energy saving measure. The control shows

CWCO on the display when CWCO is in effect. If the snow

melting system is operating, and the outdoor air temperature

falls below the CWCO setting and the slab is above freezing,

then it continues melting and stops once the slab is dry. When

the temperature reaches the CWCO setting in an actively

melting system with an 090 or 094, melting is suspended until

the outdoor temperature rises above the CWCO setting. If an

090 or 094 is not installed, melting is permanently stopped

when CWCO is in effect. Melting does not resume when the

temperature rises above the CWCO setting.

Away Scene

Scenes provide an easy way to save energy while away

on vacation, or override a programmable schedule when

plans change.

Away Key

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This control includes an Away Key to quickly disable the

snow melting system, and when connected to a tekmarNet

system, can also turn down the heating temperature on all

thermostats and suspend heating the domestic hot water

tank to maximize energy savings. To turn on the Away Key,

go to the Scene menu.

To activate the Away scene, touch “Going Away” on the

screen.

Storm

Melt

Away

Press

Away

• Select PERM (permanent) or a number of days using the

or arrow. Range is 1 to 180 days.

• Press the home button to accept the setting or leave the

screen untouched for several seconds.

• “Scene Away” is displayed on the home screen until the

number of days expires.

• Touch “Cancel Away” to cancel at any time.

User Switch

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A User Switch may be used to activate the Away scene.

Additional Scenes

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The snow melting control supports scenes 1 (normal) 2

(away) and 3 (unoccupied). Scene 3 disables the snow

melting system. When the tekmarNet

system is set to

scene 4 through 8, the snow melting control remains in

scene 1.