Chromalox APS-3C Catalog Page
APS-3C
Automatic Snow/Ice
Melting System
Controller
• Automatic Snow/Ice Melting
Control
• Operates ElectricallyAnd Mechanically- Held
Contactors for Pilot Duty
Applications
• Energy Management
Computer (EMC) Interface
• Accommodates MI, Constant
Wattage and Self-Regulating
Heaters
• Multiple Sensor Capability
• Heater Hold-On and Test
Capabilities
• C-UL-US
• Simple to Install and Operate
• Low System Costs
• Minimum Energy Costs
Heating Cable
Description
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.
The calibrated 40°F to 90°F (4°C to 32°C)
high limit thermostat prevents excessive
temperatures when using constant wattage
and MI heaters. It also permits safe testing at
outdoor temperatures too high for continuous
heater operation. The temperature sensor is
included.
The APS–3C provides a relay closure
interface for use with energy management
computers (EMC). This feature can also be
used for general purpose remote control and
annunciation and other advanced applications.
All sensor and communications wiring is
NEC Class 2. This simplifies installation while
enhancing fire and shock safety. The APS–3C
can interface up to six sensors from the
CIT–1 product family. Using more sensors
provides superior performance by better
matching the controller to site performance
requirements.
The APS–3C is an exceptionally capable
deicing controller. For complete information
describing its application, installation and
features, please contact your local Chromalox
sales office.
CONTROLS
SNOW MELTING
The ETI logo is a registered trademark of Environmental Technology, Inc. SIT is a trademark of
Environmental Technology, Inc. Copyright 2000, All rights reserved.
G-55
APS-3C
Automatic Snow/Ice
Melting System
Controller
(cont’d.)
Heating Cable
Specifications
General
Area of use Nonhazardous locations
Enclosure
Protection NEMA 3R
Cover attachment Hinged polycarbonate cover, lockable
Entries 3 × 1-1/16" entries
Material Polycarbonate
Mounting Wall mounted
Control
Supply PCN 389837 120 VAC, 50/60 Hz, 35 VA
PCN 389829 208-240 VAC, 50/60 Hz, 35 VA
Load PCN 389837 120 VAC, 24 amp max. inductive
PCN 389829 240 VAC, 24 amp max. inductive
Contact type Form C (NO-C-NC)
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 sensors from the CIT–1 product family
Circuit type NEC Class 2
Lead length Up to 500' (152m) using 18 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
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)
Up to 2,000' (609m) using 12 AWG 3-wire jacketed cable
Up to 1,000' (304m) using 12 AWG 2-wire jacketed cable
G-56
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