Automatic Snow/Ice Melting System Control Panel

Automatic Snow/Ice Melting System Control Panel
We Manage Heat ®
FEATURES & BENEFITS
•
•
•
•
Automatic snow/ice melting control
Satellite contactor interface for larger systems
Energy management computer (EMC) interface
Accomodates MI, constant wattage and self-limiting
heaters
• Multiple sensor capability
• Advanced patented and patent pending ground fault
protection
• Heater hold-on and test capabilities
• C-UL-US
• Simple to install and operate
• Low system costs
• Minimum energy costs
CL
1.3125"
(33mm)
1 x 1-1/16" (27mm) Conduit Entry
RESET
2.3125"
(59mm)
9.125"
(232mm)
TEST
GFEP
TEST
2.00"
(51mm)
11.500"
(292mm)
DESCRIPTION
The APS–4C Snow Switch when
used with one, or more, compatible
sensors automatically controls snow/ice
melting heaters for minimum energy
costs. Applications include pavement,
sidewalk, loading dock, roof, gutter
and down spout snow/ice melting in
commercial and industrial environments.
The APS–4C is interchangeable with the
earlier APS–4.
The adjustable hold-on timer
continues heater operation for up to
10 hours after snow stops to ensure
complete melting. The RCU–4 Remote
Control Unit supplied is located where
system operation can be conveniently
observed. It duplicates many of the
APS–4C front panel functions.
The APS–4C provides advanced
patented and patent pending ground
22688
05/07
(800) 234-4239
2 x 1-11/16" (43mm)
Conduit Entry
2.00"
(51mm)
6.562"
(167mm)
CL
fault equipment protection (GFEP) as
required by the USA and Canadian
National Electric Codes. The GFEP
automatically tests itself every time the
heater contactors operate and once
every 24 hours. The trip current can
be set at 60 or 120 mA via an internal
switch or retained at the 30 ma default
value. As an aid to troubleshooting
heater ground faults, the APS–4C
provides an output that can indicate the
ground current on a service person’s
portable DVM.
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.
http://www.networketi.com
The APS–4C provides a complete
interface for use in environments
supervised by an energy management
computer (EMC). This feature can also
be used for general purpose remote
control and annunciation.
All sensor and communications
wiring is NEC Class 2. This simplifies
installation while enhancing fire and
shock safety. The APS–4C 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–4C is an exceptionally
capable deicing controller. For complete
information describing its application,
installation and features, please contact
Customer Service or check on the web
at www.networketi.com.
Environmental Technology, Inc.
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DATA SHEET
Automatic Snow/Ice Melting System Control Panel
MODEL APS–4C SNOW SWITCH®
®
Model APS–4C
SPECIFICATIONS
General
Area of use
Approvals
Nonhazardous locations
Type 873
Temperature Regulating Equipment
109R
Enclosure
Protection
Cover attachment
Entries
Material
Mounting
Control
Supply
Load
Contact type
Maximum Ratings
Heater hold-on timer
System test
NEMA 3R
Hinged polycarbonate cover, lockable
1 × 1-1/16" entry (top) for NEC Class 2 connections
2 × 1-11/16" entries (bottom) for supply and load power, except 277 VAC single phase
2 × 1-1/16" entries (bottom) for supply and load power, 277 VAC single phase only
Polycarbonate
Wall mounted
ETI PN 22472: 208-240 VAC, 35 VA, three phase 50/60 Hz
ETI PN 22473: 277 VAC, 45 VA, single phase 50/60 Hz
ETI PN 22475: 277/480 VAC, 45 VA, three phase 50/60 Hz
ETI PN 22476: 600 VAC, 50 VA, three phase 50/60 Hz
ETI PN 22472: 208-240 VAC, 50 amp max. resistive
ETI PN 22473: 277 VAC, 40 amp max. resistive
ETI PN 22475: 277/480 VAC, 50 amp max. resistive
ETI PN 22476: 600 VAC, 50 amp max. resistive
3 Form A
Voltage: 600 VAC
Current: 50 amps
0 to 10 hours; actuated by snow stopping or toggle switch
Switch toggles the heater contact on and off. If temperature exceeds high limit, heater
cycles to prevent damage.
Ground Fault Equipment Protection (GFEP)
Set point
30 mA (default); 60 mA and 120 mA selectable by DIP switch
Automatic self-test
Mode A: Verifies GFEP function before contactors operate
Mode B: Verifies GFEP and heaters every 24 hours
Manual test/reset
Toggle switch provided for this function
Maintenance facility
DC output proportional to ground current provided for troubleshooting the heater
system
Snow/Ice Sensors
Sensor type
Circuit type
Lead length
High Limit Thermostat
Adjustment range
Dead band
Circuit type
Sensor interface
Lead length
2 of 3
Up to 6 sensors from the CIT–1 product family
NEC Class 2
Up to 500' (152m) using 18 AWG 3-wire jacketed cable
Up to 2,000' (609m) using 12 AWG 3-wire jacketed cable
40°F to 90°F (4°C to 32°C)
1°F (0.6°C)
Thermistor network
NEC Class 2
Up to 500' (152m) using 18 AWG 2-wire jacketed cable
Up to 1,000' (304m) using 12 AWG 2-wire jacketed cable
Environmental Technology, Inc.
http://www.networketi.com
(800) 234-4239
22688
05/07
Model APS–4C
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
Storage temperature
–40°F to 160°F (–40°C to 71°C)
–50°F to 180°F (–45°C to 82°C)
ORDERING INFORMATION
Order Number
22472
22473
22475
22476
Description
APS–4C Control Panel, 208-240 VAC 50/60 Hz Three Phase
APS–4C Control Panel, 277 VAC 50/60 Hz Single Phase
APS–4C Control Panel, 277/480 VAC 50/60 Hz Three Phase
APS–4C Control Panel, 600 VAC 50/60 Hz Three Phase
Accessories
21358
19272
22690
RCU–4 Remote Control (Qty 1 included)
High Temperature Sensor w/ 20' (6m) lead (Qty 1 included)
PTS–100 Embedded Temperature Sensor (Optional)
Snow/Ice Sensors (Not Included)
10001
CIT–1 Aerial Snow Sensor
11351
GIT–1 Gutter Ice Sensor
20756
SIT–6E Pavement Mounted Snow/Ice Sensor
Satellite Contactors (Not Included)
22477
SC–40C Satellite Contactor, 208-240 VAC 50/60 Hz Three Phase
22478
SC–40C Satellite Contactor, 277 VAC 50/60 Hz Single Phase
22480
SC–40C Satellite Contactor, 277/480 VAC 50/60 Hz Three Phase
22481
SC–40C Satellite Contactor, 600 VAC 50/60 Hz Three Phase
LIMITED WARRANTY
ETI’s two year limited warranty covering defects in workmanship and materials applies. Contact Customer Service for complete
warranty information.
DISCLAIMER
Environmental Technology, Inc. makes no representations or warranties, either expressed or implied, with respect to the contents
of this publication or the products that it describes, and specifically disclaims any implied warranties of merchantability or
fitness for any particular purpose. Environmental Technology, Inc. reserves the right to revise this publication, and to make
changes and improvements to the products described in this publication, without the obligation of Environmental Technology,
Inc. to notify any person or organization of such revisions, changes or improvements.
The ETI logo, Snow Switch, Floorstat, Tracon, We Manage Heat, APS, SC, RCU, CIT, GIT, SIT are registered trademarks of Environmental Technology, Inc.
Copyright © 2006 Environmental Technology, Inc. All rights reserved.
22688
05/07
(800) 234-4239
http://www.networketi.com
Environmental Technology, Inc.
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