frio S1 User manual

© Frio 2021 - Rev. 0.3 - Updated 3/2/2021
S1 IoT Heat Trace Controller
Operating Manual

2|© Frio 2021 - Rev. 0.3 - Updated 3/2/2021
A →
B →
C →
D
E
F
G
1DEVICE DIAGRAM
HMI (Human Machine Interface)
A. Screen
B. Buttons
C. LEDs
D. Device Reset
Wiring Area
E. High Voltage Connections
F. Low Voltage Connections
G. Ethernet Connection

3|© Frio 2021 - Rev. 0.3 - Updated 3/2/2021
TABLE OF CONTENTS
1 Device Diagram ...............................................................................................................................................................2
2 Introduction ....................................................................................................................................................................5
2.1 Overview .................................................................................................................................................................5
2.2 Intended Use...........................................................................................................................................................5
2.3 Disclaimer................................................................................................................................................................ 5
2.4 Contact Information................................................................................................................................................5
3 S1 System Overview........................................................................................................................................................6
3.1 Hardware Variants ..................................................................................................................................................6
3.1.1 Frio S1-A: Wi-Fi and Ethernet..........................................................................................................................6
3.1.2 Frio S1-C: Cellular............................................................................................................................................6
3.2 Control Modes ........................................................................................................................................................6
3.2.1 Freeze Protection............................................................................................................................................6
3.2.2 Temperature Maintenance.............................................................................................................................6
3.2.3 Manual Control ...............................................................................................................................................7
3.2.4 Cloud Control ..................................................................................................................................................7
3.3 Ground Fault Equipment Protection (GFEP)...........................................................................................................7
3.3.1 GFEP Overview................................................................................................................................................7
3.3.2 Adjusting the GFEP Trip Level .........................................................................................................................8
3.3.3 Fire Protection Mode......................................................................................................................................8
3.3.4 Testing the GFEP circuit ..................................................................................................................................8
3.4 Communication....................................................................................................................................................... 8
3.4.1 S1-A Internet Connection................................................................................................................................8
3.4.2 S1-C Cellular Internet Connection.................................................................................................................10
3.4.3 BACnet...........................................................................................................................................................11
3.4.4 Dry Contact ...................................................................................................................................................12
3.5 Alarms ...................................................................................................................................................................12
3.5.1 User-settable Alarms.....................................................................................................................................12
3.5.2 Sensor Failure................................................................................................................................................13
3.5.3 GFEP Alarms..................................................................................................................................................13
3.5.4 Active Alarms ................................................................................................................................................13
3.6 Sensors..................................................................................................................................................................13
3.6.1 RTD................................................................................................................................................................13
3.6.2 Thermistor.....................................................................................................................................................13
3.7 Device Info ............................................................................................................................................................14

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3.8 System Ratings......................................................................................................................................................14
3.9 Agency Approvals..................................................................................................................................................15
4 Installation Instructions ................................................................................................................................................16
4.1 Step 1: Initial Inspection and Planning..................................................................................................................16
4.2 Step 2: Assembly and Mounting ...........................................................................................................................16
4.3 Step 3: Low Voltage Connections .........................................................................................................................17
4.4 Step 4: Heat Trace and Power Connection...........................................................................................................17
4.5 Step 5: Start Up and Configuration.......................................................................................................................17
4.6 Step 6: Internet Connection (BlinkUp)..................................................................................................................18
4.7 Step 7: Ground Fault Test .....................................................................................................................................18
4.8 GFEP TEST FORM...................................................................................................................................................19
5 Menus, Navigation and Operation................................................................................................................................20
5.1 LEDS.......................................................................................................................................................................20
5.2 Main Screen ..........................................................................................................................................................20
5.3 Main Menu............................................................................................................................................................20
5.4 Settings..................................................................................................................................................................21
5.4.1 Advanced Settings.........................................................................................................................................21
5.4.2 Alarm Settings...............................................................................................................................................21
5.5 Start Up .................................................................................................................................................................22
5.6 Power Loss ............................................................................................................................................................22
5.7 Rebooting the Device............................................................................................................................................23
5.8 Clearing Device Settings........................................................................................................................................23
5.8.1 Restore Factory Default Settings ..................................................................................................................23
5.8.2 Clear Network Credentials............................................................................................................................23
5.9 Offline Devices ......................................................................................................................................................23
6 Firmware Upgrades.......................................................................................................................................................24

5|© Frio 2021 - Rev. 0.3 - Updated 3/2/2021
2INTRODUCTION
This operating manual provides a complete overview of the S1 IoT Heat Trace Controller, including an installation
guide and all relevant information required to use the controller. The Frio S1 shall only be used for the purposes
described in this manual and must be installed by a trained service professional in compliance with all applicable local
electrical codes, according to the instructions contained herein. For more information, including device terms and
conditions and limited warranty information, please visit www.frio.co.
2.1 OVERVIEW
The S1 is a single-circuit IoT heat trace controller for snow melting, freeze protection, and temperature maintenance
applications. The device can drive up to a 30A resistive load to control electric heat trace systems operating between
100 VAC and 277 VAC. The S1 comes in an outdoor-rated enclosure tested to IP67 standards.
Wi-Fi, Ethernet, and Cellular (available on the S1-C) capability allow the S1 to connect to the Frio cloud platform via
the internet, enabling smart, cloud-based control. When connected to the cloud, the S1 will upload system status and
receive operational commands. The Frio cloud platform integrates weather data, system feedback, and proprietary
control algorithms to automatically maximize system effectiveness and efficiency. Multiple S1 devices can be joined
together in the Frio cloud platform, allowing centralized control of multiple heat tracing systems.
The cloud connection enables advanced monitoring and notificationof your heating system. Data on key performance
characteristics are monitored over time, and anomalies or excursions are flagged and reported. The Frio cloud
platform offers customizable SMS and email notifications so that the user can be alerted immediately if there are any
issues with the system. Users can access their S1 device remotely via the Frio cloud platform to check status, activate
the system, or run a diagnostic test, eliminating the need to physically check the heater control system. If an internet
connection is not available, the S1 can operate in an offline configuration.
2.2 INTENDED USE
NOTE: THE FRIO S1 HEAT TRACE CONTROLLER MAY ONLY BE USED TO CONTROL SELF-REGULATING HEAT TRACE,
MINERAL INSULATED (MI) HEAT TRACE, OR OTHER TYPES OF UL RECOGNIZED HEAT TRACE THAT ARE DESIGNED TO
OPERATE CONTINUOUSLY. THE CONTROLLER MAY BE USED FOR FREEZE PROTECTION, TEMPERATURE MAINTENANCE, AND
SNOW MELTING SYSTEMS. THE CONTROLLER MUST BE INSTALLED BY A LICENSED ELECTRICIAN OR QUALIFIED PROFESSIONAL
IN ACCORDANCE WITH LOCAL AND NATIONAL ELECTRICAL CODES. THE CONTROLLER MUST BE CONNECTED TO A CERTIFIED
CIRCUIT BREAKER RATED FOR 30 A OR LESS, WITH NO OTHER DEVICES ON THE CIRCUIT BREAKER.
2.3 DISCLAIMER
Frio makes absolutely no representations or warranties, either expressed or implied, with respect to the contents of
this manual or the products describe herein. Frio specifically disclaims any implied warranties of merchantability or
fitness for a particular purpose. Frio does not warrant the products described herein will meet the user’s requirements
nor does it give any warranty about the results that may be obtained by using the products. Frio reserves the right to
make changes or improvements to the products described in this manual and to revise this publication at any time.
Frio is under no obligation to notify any person or organization of such changes, improvements, or revisions.
2.4 CONTACT INFORMATION
Please send all inquiries to [email protected] or to the address below:
Frio Controls
PO Box 295
Mamaroneck, NY 10543

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3S1 SYSTEM OVERVIEW
The following sections describe the features available on the Frio S1 when operating with Firmware Version v1.0. For
Frio S1 devices operating with different firmware versions, please visit www.frio.co to download the appropriate
operating manual. You may check the device firmware under Device Info on the Main Menu.
3.1 HARDWARE VARIANTS
The Frio S1 device is available in two different configurations, the S1-A with Wi-Fi and Ethernet communication, and
the S1-C with Cellular communication. To check which device you have, look at the model number located on the
product label.
3.1.1 Frio S1-A: Wi-Fi and Ethernet
The Frio S1-A can connect to the Frio cloud platform via Wi-Fi 802.11 Dual Band 2.4GHz & 5GHz or wired ethernet
connection using a Cat 5 or Cat 6 cable. The device uses an FCC certified Wi-Fi Module and has been tested to the
requirements laid out in FCC Part 15 Subpart B.
3.1.2 Frio S1-C: Cellular
The Frio S1-A can connect to the Frio cloud platform via cellular connection via multiple carriers. The device uses an
FCC certified cellular module and has been tested to the requirements laid out in FCC Part 15 Subpart B.
3.2 CONTROL MODES
The S1 device operating on firmware version v1.0.0 has four available control modes; Freeze Protection, Temperature
Maintenance, Manual Control, and Cloud Control. Future firmware versions will include additional control modes. If
your device is operating on a firmware version other than v1.0.0, please visit www.frio.co for the appropriate
operating manual.
3.2.1 Freeze Protection
Freeze protection mode can be used to prevent water in pipe systems from freezing. In freeze protection mode, the
S1 will activate the heat trace circuit when the active temperature sensor reads a value below the temperature set
point. The S1 will then turn off the heat tracing circuit when the active temperature sensor reads a value above the
temperature setpoint plus the dead-band. The dead-band is used to prevent the system from turning on and off
rapidly if the temperature hovers near the setpoint. The user may set either the RTD or Thermistor as the active
temperature sensor to be used for control. Both the temperature setpoint and the dead-band of the system can be
set by the user. The dead-band is added to the temperature setpoint such that the system will turn on when the
temperature falls below the setpoint and will turn off again once the temperature rises above the setpoint plus the
dead-band. Freeze protection mode can be used in either an Ambient sensing configuration or a Pipe sensing
configuration. In the Ambient configuration, the active temperature sensor must be placed in a location such that it
will accurately detect the lowest ambient temperature the system will see. Do not place the temperature sensor in
direct sunlight or near a source of artificial heat such as a vent. In the Pipe sensing configuration, the active
temperature sensor should be placed on the pipe on the opposite side from the heat trace.
3.2.2 Temperature Maintenance
Temperature maintenance mode can be used to control a heat tracing system within a set temperature range. In
temperature maintenance mode, the S1 will activate the heat trace circuit when the active temperature sensor reads
a value below the temperature set point. The S1 will then turn off the heat tracing circuit when the active temperature
sensor reads a value above the temperature setpoint plus the dead-band. The dead-band is used to prevent the

7|© Frio 2021 - Rev. 0.3 - Updated 3/2/2021
system from turning on and off rapidly if the temperature hovers near the setpoint. The user may set either the RTD
or Thermistor as the active temperature sensor to be used for control. Both the temperature setpoint and the dead-
band of the system can be set by the user. The dead-band is added to the temperature setpoint such that the system
will turn on when the temperature falls below the setpoint and will turn off again once the temperature rises above
the setpoint plus the dead-band. The active temperature sensor must be placed in a location where it can accurately
read the temperature of the system.
3.2.3 Manual Control
Manual control is available in two options, Always On, or Always Off. In always on mode, the device will remain on
indefinitely. In always off mode, the device will not turn on unless the user activates the manual override feature. To
manually activate the device using the Force On feature, select Force On from the Main Menu, then choose the time
that you would like the device to be on. The device may be forced on for 5 minutes, 1 hour, or 24 hours. To cancel
the Force On command, select Cancel Force On from the Main Menu. The Force On feature may also be used with
any of the other control modes selected. Users may also force the device on or off via the Frio Cloud platform as
described below. Future firmware versions will allow for manual remote activation via a local network over RS485.
3.2.4 Cloud Control
Frio S1 devices that are connected to the internet can take advantage of the Frio cloud platform, including cloud-
based control. The cloud platform allows users to view device information remotely including connection status,
heater status, and alarm information. Users can also view and adjust select device settings from the cloud platform.
Alarms can be viewed via the cloud platform but must be cleared via the HMI on the physical device.
Users can control devices from the cloud platform by setting an override which will hold the device ON or OFF for a
user-specified period. Overrides can be set for a maximum of 21 days. If a device loses power during the override
period, then subsequently regains power, the override will continue until the end of the set override period. An
override that was set from the HMI will reset on power loss. An override set from the cloud will survive power loss
once the device reconnects and will continue as an override until the end time set by the user is reached.
Snow-melting systems may be controlled automatically via the cloud platform using weather data. For more
information on cloud-based snow-melting control please see the Frio Cloud platform. Additional cloud-based control
modes will be available on future firmware versions.
3.3 GROUND FAULT EQUIPMENT PROTECTION (GFEP)
The Frio S1 device includes integrated Ground Fault Equipment Protection (GFEP) and had been tested to the UL 1053
end product standard. Ground Fault Equipment Protection is designed to shut off power to the heater in the event of
leakage current in excess of the GFEP threshold.
3.3.1 GFEP Overview
The GFEP circuit measures the sum of the current on the two conductors feeding the heater and compares this value
to a set trip level. If the value exceeds the set trip level, the controller will open the relay, shutting off the heating
circuit. Since the current flowing out to the heater should equal current flowing back from the heater, measured
ground fault current should be near 0 mA. If the value is greater than 0 mA, that is an indication that leakage current
is flowing to some other part of the system. Some leakage current can be expected with heat trace; however, systems
with high leakage current are dangerous and should not be used. The default setting for the GFEP Trip Level is 30 mA.

8|© Frio 2021 - Rev. 0.3 - Updated 3/2/2021
3.3.2 Adjusting the GFEP Trip Level
The GFEP Trip Level on the Frio S1 controller is adjustable from 30 mA to 300mA. Frio does not recommend setting
the GFEP threshold above 30 mA. In limited circumstances and always under the guidance of a licensed electrician,
the GFEP threshold may be set to a value above 30 mA. To do this, select Settings from the Main Menu, then select
Advanced Settings from the Settings Menu. Select Ground Fault Protection from the Advanced Settings Menu, then
select GFEP Trip Level. Enter the desired trip level, then confirm to set the GFEP Trip Level.
NOTE: FRIO DOES NOT RECOMMEND SETTING THE GFEP THRESHOLD ABOVE 30 mA.
3.3.3 Fire Protection Mode
Fire protection mode disables the GFEP circuit such that, in the event of a ground fault condition, the system WILL
NOT turn off the heating circuit but will still send an alarm via the dry contact. Fire protection mode is intended to be
used only in situations where the user would prefer to damage the heat trace system instead of risking turning off the
heating system due to a ground fault condition.
NOTE: FRIO DOES NOT RECOMMEND USING FIRE PROTECTION MODE TO DISABLE THE GROUND FAULT
EQUIPMENT PROTECTION CIRCUIT.
To enable Fire Protection Mode, select Settings from the Main Menu, then select Advanced Settings from the Settings
Menu. Select Ground Fault Protection from the Advanced Settings Menu, then select Fire Protection Mode. When
Fire Protection Mode is turned on, the GFEP circuit is disabled.
3.3.4 Testing the GFEP circuit
To test the GFEP circuit, follow the step-by-step instructions in section 4.7 of this manual.
Periodic testing of the GFEP circuit is required in most settings. The results of the test are to be recorded on a test
form such as the one provided with the S1 Installation Instructions in Section 4. The tester shall record on the form
the date the test was performed and the results and shall ensure the form is retained by those in charge of the
building's electrical installation to be available to the authority having jurisdiction.
3.4 COMMUNICATION
The Frio S1 device is capable of communication with the Frio cloud platform when an internet connection is available.
Future firmware versions will support connection to other systems such as a BMS via BACnet MS/TP using three-wire
TIA/EIA 485 (RS-485) connection. The network connection may be disabled via the HMI.
To disable the network connection, select Settings from the Main Menu, then select Advanced Settings from the
Settings Menu. Select Network Settings from the Advanced Settings Menu, then select Network Connection. You
will be asked if you want to Disable Networking? Select Yes to disable the network. To reenable the network
connection, follow the same directions and select Yes when asked if you want to Connect to Network.
3.4.1 S1-A Internet Connection
The Frio S1-A connects securely to the internet via a Wi-Fi connection or a wired ethernet connection, as described in
sections 3.4.1.1 and 3.4.1.2.
3.4.1.1 Ethernet
The S1-A can connect to the Frio cloud platform via an ethernet connection and supports 10Mbps and 100Mbps
operation. For firewall requirements, please review section 3.4.1.3 below. Use the Frio Mobile App to configure a
Frio S1-A device connected to ethernet via the BlinkUp process.

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3.4.1.2 Wi-Fi
The Frio S1-A is designed to use 802.11n Wi-Fi operating in the 2.4GHz band or the 5GHz band. It is also compatible
with older 2.4GHz 802.11b, 802.11g, and 802.11a networks.
To connect a Frio S1-A device to a Wi-Fi Network use the Frio Mobile App. The mobile app will allow you to configure
the device via the BlinkUp process and connect to a Wi-Fi network. To clear the Wi-Fi credentials from the device,
select Settings from the Main Menu, then select Advanced Settings from the Settings Menu. Select Network Settings
from the Advanced Settings Menu, then select Wi-Fi Credentials. You will be asked if you want to Clear Wi-Fi
Credentials? Select Yes to clear the Wi-Fi credentials and restart the BlinkUp process.
For security reasons, Frio S1-A devices cannot be configured to operate as a Wi-Fi hotspot (access point). The Frio S1-
A is capable of determining what kind of security —WEP, WPA, or WPA2 —is being used by the network it is
attempting to connect to. It supports all of these ‘consumer’ security mechanisms.
If you configure a Frio S1-A device to connect to your password-protected Wi-Fi network but subsequently downgrade
the security of the network by removing the password, the device will no longer connect to the network. To re-
connect, the device must be reconfigured with a blank password. This is by design. It is intended to prevent your
device (and other devices on the network) from being ‘captured’ by a rogue Wi-Fi access point masquerading as your
network router. It can do this by transmitting the same SSID as your network but at a higher signal strength, but
without the password, which the assailant does not know.
The Frio S1-A does not currently support enterprise-level Wi-Fi authentication, 802.1x, which requires that you log in
with a username and password as well as the customary SSID. An end-user will not be able to connect a Frio S1-A
device in such an environment at this time. There are ways to use the Frio S1-A in enterprise environments, however.
Many enterprises provide WPA2 Personal-based networks for guest access and to support other devices, such as
network printers, which do not support WPA2 Enterprise. Please check with your IT department.
The Frio S1-A does not support networks that present an HTML form in which the user enters login details before
network access is granted. Some consumer routers use this approach, but it is most commonly encountered with
public hotspots and some guest networks in corporate environments.
3.4.1.3 Firewall Requirements
The Frio S1-A is a Wi-Fi and Ethernet compatible device that only makes outbound connections. Firewall configuration
is required if the firewall stops outbound connections. This is rarely the case in consumer routers but commonplace
in corporate environments. The device communication makes use of the following ports, which need to be open
through a firewall:
Port
TCP
UDP
Usage
31314
✓
Initial device-server connection
993
✓
Fallback device-server connection #1
443
✓
Fallback device-server connection #2
80
✓
Fetch device firmware
53
✓
Allow DNS look-ups —Systems with non-default DNS settings

10 |© Frio 2021 - Rev. 0.3 - Updated 3/2/2021
The S1-A will attempt to connect via TCP port 31314. If this fails, it will attempt to use TCP port 993, which is typically
open by default for email traffic. Should both 31314 and 993 be closed, it will try 443. The S1-A does not use UDP.
Port 80 is used to request and transfer impOS™ updates. This port is typically open by default for HTTP/HTTPS
communications.
Future firmware versions will allow Frio S1-A devices to support static network configurations and access through
proxy servers.
3.4.1.4 S1-A BlinkUp Codes
The Frio S1-A provides users with information on the internet connection via the BlinkUp LED. The table below
includes status codes that can be shown via the BlinkUp LED.
Ready for activation
500ms
500ms
Repeat
BlinkUp Successful
For three seconds
Device waiting for Ethernet
500ms
500ms
250ms
250ms
Repeat
Searching for Wi-Fi network
500ms
500ms
500ms
250ms
250ms
250ms
Repeat
Joining Wi-Fi network
500ms
500ms
500ms
250ms
250ms
250ms
250ms
250ms
Repeat
Getting IP address
500ms
250ms
250ms
Repeat
Resolving server name
500ms
250ms
250ms
Repeat
Connecting to server
500ms
500ms
500ms
250ms
Repeat
Connected to server
500ms
500ms
Repeat
Proxy address or port incorrect
500ms
500ms
250ms
250ms
250ms
250ms
Repeat
Proxy credentials rejected
500ms
500ms
250ms
250ms
250ms
250ms
250ms
Device lost connection
500ms
500ms
Repeat
Device deliberately offline
500ms
250ms
250ms
250ms
Repeat
Updating Firmware
Continuous for duration of update
Normal operation
LED not illuminated
3.4.2 S1-C Cellular Internet Connection
The Frio S1-C connects to the internet via cellular connection as described in the following section. Use the Frio Mobile
App to configure a Frio S1-C device via the BlinkUp process. After device activation via BlinkUp, the Frio S1-C will
automatically connect to a cellular network via LTE bands 2, 4, 5, 12. The Frio S1-C device also has 3G fallback on
UMTS bands 5, 4, 2. Typically, the device will take 30 seconds or longer to boot the modem and connect to the cellular
network (there is a 120-second timeout in place). If you are using the Frio S1-C for the first time or in a new country,
it may take longer. The BlinkUp LED will stop flashing after 180 seconds, which means the status is not visible after
this point. Please be patient, especially on first connect, and allow the device several minutes for a first connection. If

11 |© Frio 2021 - Rev. 0.3 - Updated 3/2/2021
the first connection does not work, press the device reset button or power cycle the device. If you cannot get the
device to connect, try moving the device to an area with a better signal.
3.4.2.1 S1-C BlinkUp Codes
The Frio S1-C provides users with information on the cellular connection via the BlinkUp LED. The table below includes
status codes that can be shown via the BlinkUp LED.
Ready for activation
500ms
500ms
Repeat
BlinkUp Successful
For three seconds
Waiting for modem
500ms
500ms
500ms
250ms
Repeat
Waiting for SIM
500ms
500ms
500ms
250ms
500ms
250ms
500ms
250ms
Repeat
Registering with a cell
500ms
500ms
500ms
250ms
250ms
250ms
500ms
Repeat
Cell Registration Denied
500ms
500ms
500ms
500ms
500ms
500ms
Repeat
Connecting via PPP
500ms
500ms
500ms
250ms
Repeat
Checking PPP connection
500ms
500ms
500ms
250ms
250ms
250ms
250ms
250ms
500ms
Repeat
Connected to server
500ms
500ms
Repeat
Device lost connection
500ms
500ms
Repeat
Device deliberately offline
500ms
250ms
250ms
250ms
Repeat
Updating Firmware
Continuous for duration of update
Normal operation
LED not illuminated
3.4.3 BACnet
The following table includes the BACnet Points List that will be available on future firmware versions. The points list
is included to aid in the design of systems that will communicate with the Frio S1 via BACnet. For the latest information
on BACnet compatibility, please contact Frio at [email protected].
Object
Name
Units
R/W
Description
DO1
S1 Controller
-
R
Contains device status information and object list.
AI1
Current
Amperes
R
Current consumption of connected heat trace.
AI2
Voltage
Volts AC
R
Voltage measurement from power supply to controller.
AI3
RTD Reading
°F/°C
R
Temperature reading from RTD, if connected.
AI4
Thermistor Reading
°F/°C
R
Temperature reading from thermistor, if connected.
BO1
Heater Relay
Off/On
R/W
Power supply to heat trace. Allows override.
BO2
Alarm Contact
Open/Closed
R
Dry contact that signals device alarm status.
MV1
Temperature Units
Text
R
Set temperature units to Fahrenheit or Celsius.
MV2
Controller mode
Text
R
Operational mode of S1 when not overridden.

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3.4.4 Dry Contact
The Frio S1 is equipped with a dry contact to provide users with a low voltage alarm output option. The dry contact
is normally closed and opens when the Frio S1 has an alarm signal. The contacts are rated for 2 A maximum at 250
VAC and are compatible with 14-24 AWG wires. Users can set which alarms are enabled as described in the following
section. All enabled alarms will activate the dry contact.
3.5 ALARMS
The Frio S1 may be configured to alarm under the various conditions described in this section. Alarms are divided into
two categories, critical (High Current, Sensor Failure, and GFEP) and non-critical (Low Current,High Temperature, and
Low Temperature). The sensor failure and GFEP alarms are hard-coded and cannot be disabled. All other alarms are
user-settable and may be enabled or disabled via the HMI. All enabled alarms will activate the dry contact, and the
alarm LED. Critical alarms will either shut the system off or put the device into the failure state, which can be set by
the user via the HMI. Non-critical alarms will cause the alarm LED to light up and will activate the dry contact but will
not disrupt operation. Critical alarms are latching, meaning that if an alarm condition occurs, the alarm will be present
until the user resets the alarm from the HMI, even if the alarm condition is resolved. Non-critical alarms may be set
to be all latching or all non-latching. Non-latching alarms are dismissed when the alarm condition is resolved.
Online systems may be configured to notify users of alarm conditions through the Frio cloud platform. Users may also
use the cloud platform to view information about each alarm and, in some cases, to clear the alarm. Alarms on offline
systems can be viewed and resolved at the device via the HMI.
A summary of the available alarms is shown in the table below.
Alarm
Type
Critical
Default
Threshold
Range
Increment
Delay
Default
Delay
Low Current
User-Settable
No
0 A
0-30 A
0.1 A
0-500 s
5 s
High Current
User-Settable
Yes (Shuts Off)
30 A
0-30 A
0.1 A
0-500 s
300 s
Low Temperature
User-Settable
No
35 °F
0-300 °F
1 °F
0-500 s
300 s
High Temperature
User-Settable
No
140 °F
64-300 °F
1 °F
0-500 s
300 s
Sensor Failure
Hard-coded
Yes (Failure State)
False
-
-
No
-
GFEP Trip
Hard-coded
Yes (Shuts Off)
30 mA
30-300 mA
5 mA
No
-
GFEP (Fire protection mode)
Hard-coded
Yes
30 mA
30-300 mA
5 mA
No
-
3.5.1 User-settable Alarms
User-settable alarms are designed to provide the user with a method to monitor their system and to understand if the
system is operating outside of normal bounds. These alarms may be enabled or disabled via the HMI and include High
Current,Low Current,High Temperature, and Low Temperature. Enabled alarms will activate the dry contact. With
the exception of high current, user settable alarms are not enabled by default and must be enabled by the user. To
configure user-settable alarms, select Settings from the Main Menu, then select Advanced Settings from the Settings
Menu. Select Alarms from the Advanced Settings Menu, then select the alarm you would like to adjust.
For each user-settable alarm, you will be able to: enable the alarm, set the threshold, and set the delay. The delay is
provided to reduce nuisance alarms. When using the high current alarm with self-regulating heat trace, it is highly
recommended to use a delay of at least 300s to avoid alarming due to inrush current when the heat trace is activated.
The high current alarm is a critical alarm and will shut off the system automatically if the alarm is enabled. It is also a
latching alarm and must be reset via the HMI. Non-critical user-settable alarms may be set to Latching or Non-latching
in the alarm settings. This setting will apply to all enabled non-critical alarms.

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3.5.2 Sensor Failure
The sensor failure alarm is a critical alarm that is enabled if the device is in a control mode that relies on a local
temperature sensor. If the sensor fails, the device will go into the failure state. To configure the failure state, select
Settings from the Main Menu, then select Failure State from the Settings Menu. The failure state may be set to ON
or OFF. The default setting for the failure state is ON. If the sensor returns to normal operation, the system will revert
from the failure state and resume using the sensor for control. However, the sensor failure alarm is latching, so the
alarm will remain present until it is reset via the HMI.
3.5.3 GFEP Alarms
The GFEP system will alarm and activate the dry contact when the ground fault current exceeds the GFEP Trip Level,
which will automatically shut off the heating system. The GFEP alarm is a critical alarm that is latching and must be
reset by the user via the HMI. The device will automatically run a GFEP test and must pass in order to clear a GFEP
alarm.
When this device is in fire protection mode, the system will not turn off the heating system when the ground fault
current exceeds the GFEP Trip Level, but the system will still activate the GFEP alarm and the alarm dry contact. In
this case, the GFEP alarm will be latching and must be cleared via the HMI.
3.5.4 Active Alarms
Active alarms can be viewed from the HMI by selecting Active Alarms from the Main Menu. The active alarm page
on will display all active alarms. The user may select an alarm to view: Duration (the time since the alarm condition
started), Returned? (whether the alarm condition ceased/returned to normal).
To reset the alarms, select Active Alarms from the Main Menu, then select Reset All. You will then be prompted to
Test/Reset Now, select Yes to initiate a GFEP test and reset the alarm conditions. The GFEP test must be successful
in order to reset the alarms.
3.6 SENSORS
The Frio S1 device includes internal sensors that monitor supply voltage, operating current, and ground fault current.
Information from these sensors is used for control of the system, system monitoring, alarms, and GFEP. The Frio S1
also includes two optional external temperature sensors: an RTD and a thermistor.
3.6.1 RTD
The Frio S1 is compatible with all 3 wire pt100 RTDs. RTD lead wires must be 18-24 AWG shielded twisted pair.
3.6.2 Thermistor
The Frio S1 should only be used with the Frio thermistor. The Frio thermistor is a 10k NTC thermistor with ± 1%
accuracy. The Frio thermistor has an operating range of -40°C to 105°C and an international protection rating of IP68.
The Frio thermistor is RoHS Compatible Thermistors. Each Frio thermistor comes with 2m leads, which may be
extended as required using twisted shielded pair 24 AWG wire. The lead wire is black TPE, and the thermistor tip is
encapsulated using black TPE.

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3.7 DEVICE INFO
Device info can be viewed under Device Info on the Main Menu. Available information includes.
Device Info
Description
FW Version
Device firmware version
P/N
Device part number
S/N
Unique device serial number
Device ID
Unique device ID number
Connection
Connection type, (Wi-Fi, Cellular, Ethernet, or None if not connected )
DHCP
The DHCP server’s IP address (Wi-Fi and Ethernet)
IP
Device IP address (Wi-Fi and Ethernet)
Network
The network the devices is currently connected to (Wi-Fi only)
rssi
Received signal strength indicator, a negative value closer to 0 shows stronger signal (Wi-Fi only)
Channel –
The Wi-Fi channel on the router (Wi-Fi only)
Link
"10M" or "100M". Only present when link detected (Ethernet only)
3.8 SYSTEM RATINGS
Power Ratings
Supply Voltage: 120 to 277 Nominal VAC 50/60 Hz.
Single phase power only (Note: 277 VAC is phase-to-neutral in 480/277 VAC 3- phase)
Double-pole relay is safe for 240 VAC with two hot legs
Maximum Load: 30 A resistive
Wire size: 10-18 AWG
GFEP
Programable from 30 mA to 300 mA (default 30 mA)
Manual and automatic test
Fire protection mode allows user to disable GFEP
Sensor Inputs
Frio Thermistor: 2-Wire shielded pair 24 AWG leads, 10k NTC thermistor with ± 1% accuracy, operating range of -
40°C to 105°C, leads and thermistor tip are black TPE, IP68, and RoHS)
RTD: Compatible with 3-Wire pt100 RTD lead size 14-24 AWG
Low Voltage Outputs
Dry Contact Alarm: Normally Closed, Open on Alarm (contacts rated for 2 A max at 250 VAC, 14-24 AWG)
Connectivity
S1-A: WI-FI 802.11 Dual Band 2.4 GHz & 5 GHz and Ethernet (RJ45, Cat 5 or 6) See operating manual for firewall
information
S1-C: Cellular only
TIA/EIA 485 (RS-485): for BACnet MS/TP and Frio Modus (Isolated 3-wire 2 x Signal w/ GND, 14-24 AWG)
Enclosure/Environment
Enclosure tested to IP67
Operating Temperature -30 °C to 70 °C
Dimensions with mounting feet: H: 6.29 in. D: 3.625 in. W: 7.55 in.
Agency Ratings
UL 1053, CSA Standard C22.2 No. 14 (Ground-Fault Sensing and Relaying Equipment)
Complies with FCC Part 15 Subpart B

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User Interface
2.42 in. OLED display 128 x 64 pixels
Four button interface
Four LEDs with one phototransistor used for BlinkUp process during installation
Menus are in English only
Imperial or Metric units
Warranty
One-year limited warranty –view more warranty information at www.frio.co/legal
3.9 AGENCY APPROVALS
Both the S1-A and S1-C heat trace controllers conform to UL Standard 1053 and are certified to CSA Standard C22.2
No. 14 for Ground-Fault Sensing and Relaying Equipment.
Both the S1-A and S1-C devices comply with part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
NOTE: THE S1-A AND S1-C HAVE BEEN TESTED AND FOUND TO COMPLY WITH THE LIMITS FOR A CLASS A
DIGITAL DEVICE, PURSUANT TO PART 15 OF THE FCC RULES. THESE LIMITS ARE DESIGNED TO PROVIDE
REASONABLE PROTECTION AGAINST HARMFUL INTERFERENCE WHEN THE EQUIPMENT IS OPERATED IN A
COMMERCIAL ENVIRONMENT. THIS EQUIPMENT GENERATES, USES, AND CAN RADIATE RADIO FREQUENCY ENERGY
AND, IF NOT INSTALLED AND USED IN ACCORDANCE WITH THE INSTRUCTION MANUAL, MAY CAUSE HARMFUL
INTERFERENCE TO RADIO COMMUNICATIONS. OPERATION OF THIS EQUIPMENT IN A RESIDENTIAL AREA IS LIKELY
TO CAUSE HARMFUL INTERFERENCE IN WHICH CASE THE USER WILL BE REQUIRED TO CORRECT THE INTERFERENCE
AT HIS OWN EXPENSE.

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4INSTALLATION INSTRUCTIONS
NOTE: THE CONTROLLER MUST BE INSTALLED BY A LICENSED ELECTRICIAN OR QUALIFIED PROFESSIONAL IN
ACCORDANCE WITH LOCAL AND NATIONAL ELECTRICAL CODES. THE CONTROLLER MUST BE CONNECTED
TO A CERTIFIED CIRCUIT BREAKER RATED FOR 30 A OR LESS. NO OTHER TYPES OF DEVICES MAY BE PLACED ON THE
CIRCUIT BREAKER.
4.1 STEP 1: INITIAL INSPECTION AND PLANNING
1. Inspect the Frio S1 controller for any damage that may have occurred during shipping.
2. Layout and plan the heat tracing system, including all sensors, wiring, conduit, and junction boxes.
3. Determine the controller location. The controller should be mounted on a fixed vertical surface. The controller
may be mounted outside but should not be mounted in direct sunlight to reduce the chance of condensation
forming in the controller.
4.2 STEP 2: ASSEMBLY AND MOUNTING
1. Once you have determined the wiring layout and conduit sizes, mark the
bottom face of the controller for power and sensor connections. If the
controller is mounted outside, use only NEMA Type 4X (or higher) liquid-
tight conduit fittings and cable glands.
2. Drill holes on the bottom face of the controller (mount fittings inside of
the dashed line shown in Figure 1) and mount your conduit and cable
fittings. Do not drill holes within 0.5” of the edge of the enclosure. After
drilling the holes, ensure that all plastic shavings have been removed from
the controller.
3. Mark hole locations on the vertical surface where you will mount the controller according to the dimensions
shown in Figure 2. Ensure the mounting surface is flat, permanent, and the controller is protected from damage.
4. Mount the controller to the vertical surface.
Figure 1: Frio S1 controller showing the
bottom side where to drill wiring holes.
5.60 in.
6.95 in.
Screws to remove
Wiring Cover
Figure 2: Top View of the Frio S1 controller showing mounting hole dimensions.

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4.3 STEP 3: LOW VOLTAGE CONNECTIONS
1. Once the controller is mounted, you may remove the clear plastic enclosure cover and the white wiring cover.
Always ensure that the wiring cover is in place before energizing the controller.
2. Connect low voltage sensor and communications wires according to the image in Figure 3.
3. For more information on sensor compatibility and setup, please consult the owner’s manual.
NOTE: THE SYSTEM SHOULD NEVER BE ENERGIZED WHEN THE WIRING COVER IS NOT IN PLACE.
4.4 STEP 4: HEAT TRACE AND POWER CONNECTION
1. Ensure the circuit breaker that will power the controller is turned off.
2. Use a Megger Test device to check the integrity of the heat trace in accordance with the heat trace
manufacturer’s instructions.
3. Connect heat trace leads as shown in Figure 3. The ground sheath of the heat trace must be connected to the
ground terminal on the controller.
4. Connect the power leads as shown in Figure 3. The ground connection on the controller must be properly
connected to ground in accordance with local and national electrical codes.
5. All power connections and wires should be installed in accordance with all local and national electrical codes.
Use crimp connected spade terminals to ensure proper mounting in the power terminal blocks.
4.5 STEP 5: START UP AND CONFIGURATION
1. Close the wiring cover before energizing the system.
2. Energize the system by turning on the circuit breaker for the heat tracing circuit.
3. Press any button to access the Main Menu, then select Settings to configure the device. Refer to section 5.4 of
the S1 Operating Manual for available settings and consult section 3 to determine the control mode and
configuration that will best serve your purpose.
Figure 3: Top view of the Frio S1 controller with the wiring cover removed, showing all possible wiring connections.

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4.6 STEP 6: INTERNET CONNECTION (BLINKUP)
1. Download and Login to the Frio App.
2. Complete App Setup and enter all required information.
3. Connect to the S1 Controller via BlinkUp as directed in the Frio App.
4. Follow the in-app instructions to connect the Frio S1 controller to the internet and the Frio Cloud Platform.
4.7 STEP 7: GROUND FAULT TEST
The Frio S1 controller includes built-in Ground Fault Equipment Protection (GFEP). The GFEP circuit must be tested
during installation. To test the GFEP circuit, follow the instructions below.
1. Press any button on the controller to enter the Main Menu.
2. Select GFEP Test and press enter.
3. You will be prompted to Test GFEP now to test the GFEP circuit, select Yes.
4. The controller will display RUNNING GFEP TEST during the test and TEST SUCCESS for a successful test. If the test
is not successful, the device will display TEST FAILED. If the GFEP test fails, turn off the system at the breaker and
disconnect the heat trace. Rerun the test with nothing connected to the load terminal blocks. If the test is
successful with nothing connected, there is a wiring error or a fault with the heat trace.
5. If the test is successful with heat trace connected, record the test on the GFEP Test Form on the next page, and
ensure that the GFEP Test Form is retained by those in charge of the building's electrical installation in order to
be available to the authority having jurisdiction.

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4.8 GFEP TEST FORM
DATE
GFEP TEST RESULT
TEST PERFORMED BY
COMPANY
NOTE: THIS TEST FORM MUST BE RETAINED BY THOSE IN CHARGE OF THE BUILDING'S ELECTRICAL
INSTALLATION IN ORDER TO BE AVAILABLE TO THE AUTHORITY HAVING JURISDICTION.

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5MENUS,NAVIGATION AND OPERATION
Section 5.1 through 5.4 provide a layout of all available information that can be accessed via the HMI. Press any
button to enter the Main Menu and use the UP, DOWN, ENTER, and BACK buttons to navigate through the menus and
change settings. For more information, please review the relevant section of the Operating Manual.
Sections 5.5 through 5.6 provide information on what the device does on start up or in the event of a power loss.
Sections 5.7, 5.8, and 5.9 cover rebooting the device, clearing device settings and offline devices.
5.1 LEDS
There are 5 LED light pipes on the front faceplate of the Frio S1.
▪Status –LED will be GREEN if the device is operating properly with no alarms.
▪Alarm –LED will be RED when an alarm is present.
▪Heat –LED will light up RED when the device first turns on and when the heater output is active.
▪BlinkUp –See sections 3.4.1 and 3.4.2 for BlinkUp Codes
▪Photo –Used for BlinkUp process only, ensure phone screen covers this area during BlinkUp.
5.2 MAIN SCREEN
The main screen displays information about the device at all times including:
▪Current –Displays the current draw of the heating system
▪Temperature –Displays the temperature of the control temperature sensor
▪Connected –Provides connection status (Yes or No)
5.3 MAIN MENU
Press any button to enter the Main Menu and use the UP, DOWN, ENTER, and BACK buttons to navigate through the
menus. Options on the main menu are:
▪Force System On –Not available if the device is in Alarm
▪Select ON time –Select the force on period (5 min, 1 hour, 24 hours, Cancel)
NOTE: When the device is forced on you will see the following: Cancel Force On
▪Cancel? –Cancel the force on (Yes, No)
▪Run GFEP Test
▪Test GFEP Now? –Select to test the GFEP system (Yes, Cancel)
▪Active Alarms –Shows a list of active alarms, see section 3.5.4 for more details.
▪Rest All –Clears and resets all alarms, select Yes to initiate a GFEP test and reset the alarm
conditions. The GFEP test must be successful in order to reset the alarms.
▪Device Info –See section 3.7 for available device information.
▪Settings –See section 5.4 for available settings.