tekmar Snow Melting Control 650

Control Description The Snow Melting Control 650 is a microprocessor-based manual start / stop control that maintains a set temperature in a snow melting slab. The 650 uses pulse width modulation (PWM) to operate an on / off injection valve, pump, boiler or contactor for electric cables. Other 650 features include Slab Outdoor Reset, Warm Weather Cut Off, Cold Weather Cut Off, Snow Melting Setpoint and Snow Idling Setpoint. The control also has a built-in timer for timed melting events.

Literature	—	D 650, A 650's, D 001, D 070, D 079
Control	—	Microprocessor PI control; This is not a safety (limit) control
Packaged Weight	—	1.3 lb. (600 g), Enclosure C, white PVC plastic
Dimensions	—	4-3/4" H x 2-7/8" W x 7/8" D (120 x 74 x 22 mm)
Approvals	—	CSA C US, meets ICES & FCC regulations for EMI/RFI
Ambient Conditions	—	Indoor use only, -20 to 120°F (-30 to 50°C), < 90% RH non-condensing
Power Supply	—	Class 2, 24 V (ac) ±10% 50/60 Hz 2 VA or 32 V (dc) ±20% 0.04 A
Relays	—	240 V (ac) 10 A 1/3 hp, pilot duty 240 VA 2 A
Sensors Included	—	NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 Outdoor Sensor 070 and Slab Sensor 072
On Time	—	0:30 to 19:50 hours to 'Infinite'
Melting	—	34 to 45°F (1 to 7°C)
Idling	—	Off, 23 to 34°F (Off, -5 to 1vC)
CWCO	—	Off, -22 to 23°F (Off, -30 to -5°C)
Temperature Display	—	Fahrenheit / Celsius

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Literature

Control

Packaged Weight

Dimensions

Approvals

Ambient Conditions

Power Supply

Relays

Sensors Included

On Time

Melting

Idling

CWCO

Temperature Display