Emerson SA-1 manual Operation Instructions, Electrical Specifications

Automatic Snow/Ice Melting Controller — Installation & Operation Instructions sa-1 3

OPERATION INSTRUCTIONS

The SA-1 snow melting control is designed to energise the heating cable only when snow or ice conditions exist and there is risk of freezing. If the temperature is below 3°C (38°F) and snow is falling, the controller will apply power to heating cable. The cable remains energised until 2.75 hours after the snow stops. The delay is necessary to ensure the heated area dries. If at any time the snow starts falling again the controller restarts the heating cycle.

In spring or fall when the snow conditions are not very heavy, the controller may switch on the heated area. For this situation we recommend having a manual switch connected in series with the SA-1 to turn it off.

In wintertime the wind may cover the heated area with snow. The SA-1 can not sense this situations and will not energise the heating cable. Putting snow on the sensor surface can energise the SA-1.

The SA-1 may be tested for functionality if the outside temperature is below 25°C (77°F), Submerge the temperature sensor into a glass with ice water for 5 to 10 minutes, wet the surface of the moisture sensor, the SA-1 should energise the heating cable. After this test, dry off the sensor, disconnect the power for one minute and then reconnect it back. The cables should remain deenergised.

Every year, in the fall the SA-1 must be inspected for physical damage and to clean up the snow sensor surface. To clean the snow sensor surface:

1.Disconnect SA-1 from the power supply.

2.With a clean, soft bristle tooth brush clean up the surface of the snow sensor.

3.Reconnect SA-1 to the power supply.

2" (50.80mm) min.

Roof

SA-1 1" (25.40mm)

Gutter

.5" (12.70mm) Tubing

Electrical Junction Box

Figure 4a

ELECTRICAL SPECIFICATIONS			Figure 4b
Functional			Supply requirements
Operating temperature		+3°C (38°F +/-1°F)	Power supply voltage		120VAC
Power switch OFF temperature		+45°C (112°F)	Frequency		50/60 Hz
Power switch ON temperature		+30°C (86°F)	Maximum power consumption		60W
Environmental			Output characteristics
Working temperature	-40°C (-40°F) to 65°C (150°F)		Output type		relay (dry contact)
Storage temperature	-45°C (-49°F) to 70°C (160°F)		Contact output	N.O. max. 16 Amps @ 120VAC
Humidity environment		0 to 100 %
			Mounting connector		.5" (12.70mm) NPT
			Power wire length		3 feet

US	T. (800) 537-4732 / F. (888) 324-2440
CAN	T. (800) 794-3766 / F. (800) 361-4574

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