snow switch APS-3C

Automatic Snow and Ice Melting System Control

The APS-3C Snow Switch when used with compatible sensors automatically controls snow/ice melting heaters, ensuring minimum operating costs. Typical applications include pavement, sidewalk, loading dock, roof, gutter and down spout snow/ice melting. The APS-3C is interchangeable with earlier APS–3 models. The adjustable hold-on timer continues heater operation for up to 10 hours after snow stops to ensure complete melting. The optional RCU–3 Remote Control Unit can be located where system operation can be conveniently observed. It duplicates many of the controls and indicators on the APS-3C front panel. It is used to clear tracked and drifting snow that may not land on a sensor.
  • High limit thermostat
  • Relay closure interface

APS-3C Data Sheet

  C Series Manual

  Snow and Ice Sensor Data Sheet

FEATURES

  • Automatic snow/ice melting control
  • Operates electrically- and mechanically held contactors
  • Energy management computer (EMC) interface
  • Accommodates MI, constant wattage and self-limiting heaters
  • Multiple sensor capability
  • Heater hold-on and test capability
  • C-UL-US
  • Simple to install and operate
  • Low energy costs
  • Minimum energy costs

APS-3C  |  SPECIFICATIONS

General
Area of use Nonhazardous locations
Approvals
Enclosure
Protection NEMA 3R
Cover attachment Hinged polycarbonate cover, lockable
Entries 3 × 1-1/16″ entries
Material Polycarbonate
Mounting Wall mounted
Control
Supply ETI PN 22470: 120 VAC, 50/60 Hz, 35 VA
ETI PN 22471: 208-240 VAC, 50/60 Hz, 35 VA
Load ETI PN 22470: 120 VAC, 24 amp max. inductive
ETI PN 22471: 240 VAC, 24 amp max. inductive
Contact type Form C
Maximum Ratings Voltage: 240 VAC
Current: 24 amps
Heater hold-on timer 0 to 10 hours; actuated by snow stopping or toggle switch
System test Switch toggles the heater contact on and off. If temperature exceeds high limit, heater cycles to prevent damage.
Snow/Ice Sensors
Sensor type Up to 6 sensor from the CIT–1 product family
Circuit type NEC Class 2
Lead length Up to 500′ (152m) using 18 AWG 3-wire jacketed cable
Up to 2,000′ (609m) using 12 AWG 3-wire jacketed cable
High Limit Thermostat
Adjustment range 40°F to 90°F (4°C to 32°C)
Dead band 1°F (0.6°C)
Sensor type Thermistor network
Circuit type NEC Class 2
Lead length Up to 500′ (152m) using 18 AWG 2-wire jacketed cable
Up to 1,000′ (504m) using 12 AWG 2-wire jacketed cable
Energy Management Computer (EMC) Interface
Inputs OVERRIDE ON (10 ma dry switch contact)
OVERRIDE OFF (10 ma dry switch contact)
Outputs SUPPLY (10 ma dry switch contact)
SNOW (10 ma dry switch contact)
HEAT (10 ma dry switch contact)
HIGH TEMP (10 ma dry switch contact)
ALARM (10 ma dry switch contact)
Environmental
Operating temperature −40°F to 160°F (−40°C to 71°C)
Storage temperature −50°F to 180°F (−45°C to 82°C)

ORDERING INFORMATION

Order Number Description
22470 APS–3C Control Panel, 120 VAC
22471 APS–3C Control Panel, 208/240 VAC
Accessories
21357 RCU–3 Remote Control (Optional)
19272 High Temperature Sensor w/ 20′ (6m) lead (Qty 1 included)
22690 PTS–100 Embedded Temperature Sensor (Optional)

We're dedicated to our customers

From the front office to the production floor, we go above and beyond to help make your project successful.

We're dedicated to our customers

From the front office to the production floor, we go above and beyond to help make your project successful.