Proliphix NT10e User manual

Proliphix
NT10e & NT20e
Configuration Guide

Rev 2.0 Page i of iii
TABLE OF CONTENTS
INTRODUCTION.........................................................................................................................................5
QUICK SETUP ...............................................................................................................................................5
Real Time Clock....................................................................................................................................5
IP Addressability ...................................................................................................................................5
Remote Management...........................................................................................................................6
RESET ACTUATION.......................................................................................................................................6
Software Reset......................................................................................................................................7
Factory Reset........................................................................................................................................7
FAILSAFE FEATURE ......................................................................................................................................7
THERMOSTAT DEVICE INTERFACE....................................................................................................8
BUTTONS AND SCREENS...............................................................................................................................8
LCD SCREENS..............................................................................................................................................9
Thermostat Screen...............................................................................................................................9
HVAC Screen......................................................................................................................................12
Sensor Status Screen ........................................................................................................................15
Status & Control Screen ....................................................................................................................16
Thermostat Control Screen ............................................................................................................................17
Thermostat Status Screen..............................................................................................................................19
Alarm Status Screen........................................................................................................................................19
Network Status Screen ...................................................................................................................................20
NETWORK INTERCONNECT ................................................................................................................22
THERMOSTAT MANAGEMENT INTERFACE (TMI)........................................................................23
HTML INTERFACE.....................................................................................................................................23
STATUS &CONTROL PAGE.......................................................................................................................24
Temperature Status............................................................................................................................25
Zone Temperature...............................................................................................................................................25
Local (Temperature)...........................................................................................................................................25
RS #1..................................................................................................................................................................25
RS #2..................................................................................................................................................................25
Override..............................................................................................................................................................25
Cool Setting........................................................................................................................................................25
Heat Setting........................................................................................................................................................25
Hold Mode..........................................................................................................................................................26
Schedule Settings...............................................................................................................................26
Day Class / Period ..............................................................................................................................................26
Cool....................................................................................................................................................................26
Heat ....................................................................................................................................................................26
HVAC Settings.....................................................................................................................................26
HVAC State........................................................................................................................................................26
HVAC Mode ......................................................................................................................................................26
Fan Mode............................................................................................................................................................27
Alarm Status........................................................................................................................................27
Low Temperature ...............................................................................................................................................27
High Temperature...............................................................................................................................................27
Filter Change......................................................................................................................................................27
GENERAL SETTINGS PAGE........................................................................................................................28
Zone Name..........................................................................................................................................28
Name ..................................................................................................................................................................28
Serial Number.....................................................................................................................................................28
SW Ver / HW Rev..............................................................................................................................................29
Display Contrast.................................................................................................................................................29
Alarms...................................................................................................................................................29

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iii
Low Temp(erature) Limit...................................................................................................................................29
High Temp(erature) Limit ..................................................................................................................................29
Filter (change) Reminder....................................................................................................................................29
Filter Last Replaced............................................................................................................................................30
Reminder Pending ..............................................................................................................................................30
Date and Time.....................................................................................................................................31
Set Date and Time ..............................................................................................................................................31
U.S. Daylight Savings Time...............................................................................................................................31
SETBACK SCHEDULE PAGE.......................................................................................................................32
Proliphix Scheduling...........................................................................................................................32
Day Class Schedules......................................................................................................................................32
Default Weekly Schedule................................................................................................................................32
Calendar View..................................................................................................................................................32
Home Class Schedule Page .............................................................................................................34
Period .................................................................................................................................................................34
Time ...................................................................................................................................................................34
Heat (Temp)........................................................................................................................................................34
Cool (Temp) .......................................................................................................................................................34
Out Class Setback Page....................................................................................................................35
Period .................................................................................................................................................................35
Time ...................................................................................................................................................................35
Heat (Temp)........................................................................................................................................................35
Cool (Temp) .......................................................................................................................................................35
Away Class Setback Page ................................................................................................................36
Period .................................................................................................................................................................36
Time ...................................................................................................................................................................36
Heat (Temp)........................................................................................................................................................36
Cool (Temp) .......................................................................................................................................................36
Default Weekly Schedule...................................................................................................................37
Day.....................................................................................................................................................................37
Class...................................................................................................................................................................37
Special Days Table.............................................................................................................................38
Special Days Examples..................................................................................................................................39
NETWORK SETTINGS PAGE.......................................................................................................................42
Addressing...........................................................................................................................................42
MAC Address.....................................................................................................................................................42
IP Address Method.............................................................................................................................................42
IP Address ..........................................................................................................................................................43
Subnet Mask.......................................................................................................................................................43
Gateway Address................................................................................................................................................43
Web Server..........................................................................................................................................43
HTTP Port ..........................................................................................................................................................43
ADVANCED SETTINGS PAGE .....................................................................................................................44
Thermostat Configuration..................................................................................................................44
HVAC System Type...........................................................................................................................................44
Heat Control .......................................................................................................................................................45
Cool Control.......................................................................................................................................................45
Compressor Delay ..............................................................................................................................................45
Heat Control .......................................................................................................................................................46
Aux Heat Offset..................................................................................................................................................46
Cool Control.......................................................................................................................................................46
Compressor Delay ..............................................................................................................................................46
Reset on Submit..................................................................................................................................................46
SENSOR SETTINGS PAGE..........................................................................................................................47
Local Sensor........................................................................................................................................47
State....................................................................................................................................................................47
Sensor Averaging ...............................................................................................................................................48
Remote Sensor 1 / 2...........................................................................................................................48
Name ..................................................................................................................................................................48
State....................................................................................................................................................................48
Sensor Type........................................................................................................................................................48

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Sensor Averaging ...............................................................................................................................................48
Sensor Correction...............................................................................................................................................48
REMOTE ACCESS PAGE............................................................................................................................49
Remote Discovery...............................................................................................................................49
State....................................................................................................................................................................49
Site Name...........................................................................................................................................................49
Address...............................................................................................................................................................50
Outgoing Port .....................................................................................................................................................50
Interval................................................................................................................................................................50
Last Attempt.......................................................................................................................................................50
Last Success .......................................................................................................................................................50
Customer Information.........................................................................................................................51
Customer ID .......................................................................................................................................................51
REMOTE DISCOVERY STATUS PAGE ........................................................................................................52
WARRANTY INFORMATION.................................................................................................................53

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Introduction
Congratulations! You have purchased the most advanced and technically sophisticated thermostat
available today. The NT10e and NT20e are powered by Proliphix Network Power and are identical in
features with one exception; the NT20e supports two remote thermal sensors and the NT10e does not
support external thermal sensors.
Once the physical installation of the thermostat is complete you will perform much of the configuration
operations from the Proliphix Thermostat Management Interface (TMI) with your web browser. The Proliphix
TMI provides a sophisticated management capability to manage and control your Proliphix thermostats.
The Proliphix Network Thermostat also provides you the ability to perform many of the traditional functions
using the buttons located on the front of the unit. These buttons allow you to modify the temperature, enable
some basic HVAC functions and to view the thermostat’s network configuration and status. Please review
the section entitled “Thermostat Device Interface” for more information on these functions.
This manual is organized into the following sections;
1. Thermostat Device Interface – Management and control capability at the thermostat.
2. Network Interconnect – Connecting your thermostat to your local network.
3. Thermostat Management Interface – Management and control capability through the web browser.
4. Warranty Information
Quick Setup
The remaining sections of this document describe in detail which settings and parameters must be
configured to access and control your Proliphix Network Thermostat through either the Thermostat Device
Interface or more comprehensively through the browser-based Thermostat Management Interface.
Proliphix recommends the following basic actions to ensure reliable operation of your thermostat. Please
refer to the above sections for a detailed understanding of how to perform these basic steps to enable these
functions.
Real Time Clock
Your Proliphix Network Thermostat comes directly from the factory with the real time clock disabled to
ensure longer battery life. You must enable the real time clock to provide you years of accurate
timekeeping on your thermostat. Please perform the following steps to enable your real time clock;
1. Proceed directly to the General Settings TMI page.
2. Without changing any parameters, press Submit.
IP Addressability
Your Proliphix Network Thermostat comes directly from the factory set to support the DHCP mode for
assigning an IP address to your thermostat. See the DHCP Assigned IP Addresses section in the Network
Interconnect chapter. Proliphix recommends that immediately after retrieving the IP address and port
number from your thermostat (Thermostat Device Interface – Status & Control Screen – Network Status
Screen) you should;

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1. Access the Network Settings Page in the Thermostat Management Interface.
2. Disable the DHCP function by selecting Static IP addressing.
3. Select a unique IP address, Subnet Mask, Gateway address and HTTP port number.
4. Press the “Submit” button.
Remote Management
The Basic Series of Proliphix Network Thermostats can be managed with a web browser on a local area
network (LAN) or remotely though the Internet after proper authentication at the Proliphix web site
(www.proliphix.com).
Note: If a VPN is used to access your thermostats remotely, they will appear to reside on your “local”
network. You will therefore not need to control them through the Proliphix Remote Management Service via
the Proliphix web site. However, email notification due to alarm conditions will NOT be available with VPN
use.
A more complete explanation for remotely managing a Network Thermostat is available in both the Proliphix
Remote Management Setup Guide and the Proliphix Remote Management User Guide. A short hand
procedure to establish the identity of the thermostat for Remote Management capability is described below.
Using the TMI locally, take the following actions;
1. Access the General Settings Page through the TMI.
2. Enter a meaningful Zone Name.
3. Press Submit.
4. Access the Network Settings Page through the TMI.
5. Set the IP Address Method to Static.
6. Select a unique IP address, Subnet Mask, Gateway address and HTTP port number.
7. Press Submit.
8. Access the Remote Access Page through the TMI.
9. Enter a meaningful Site Name (could be the name or location of the property).
10. Press Submit.
You must consult the Proliphix Remote Management Setup Guide to complete the configuration of your
thermostat for Remote Management. After completing the remote Management Setup, the thermostat will
attempt to communicate with the Proliphix Web Site and identify itself as an authorized thermostat.
Reset Actuation
The Proliphix Network Thermostats are sophisticated network enabled electronic devices. The technology
used in the NT10e or NT20e can automatically retrieve an Internet address from the network router, serve
easy-to-use HTML pages to any web browser, provide secure management capability from anywhere in the
Internet as well as perform advanced thermostat functions. This capability is provided by highly integrated
processor technology.
Although it is highly unlikely that the Proliphix Network Thermostats will be unable to perform correctly
against unsolicited and unwanted network activity, at some time a reset may be necessary to bring the
Network Thermostat back into proper operation. If this is necessary, there are two types of resets which can
be performed on the thermostat. Either type should only be initiated after instruction from a qualified
Proliphix customer support representative. See Customer Assistance section at the end of this guide.

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Software Reset
A software reset is a non destructive reset which reboots the network processor yet retains the
programming and thermostat setback schedules. This reset can be performed at the thermostat;
1. Proceed directly to the Status & Control LCD Screen.
2. Select Thermostat Control
3. Press Reset for longer than 3 seconds
Factory Reset
A factory reset is a memory destructive reset which will reset the thermostat and clear the internal memory
which will return the thermostat to the state prior to shipment from Proliphix manufacturing. The setback
scheduling and other programmed parameters will be lost and unrecoverable. In addition, the IP addressing
mode will revert back to DHCP, the current IP address will be lost and the thermostat will become
unreachable (until the thermostat retrieves a new address from the local DHCP server).
It is recommended that this factory reset be used only when advised by a Proliphix
customer support representative.
This reset can be performed at the thermostat;
1. Remove the thermostat cover from the base which attached to the wall. (See NT10e and NT20e
Installation Guide)
2. Attach top of cover to top of base as a hinge. (See NT10e and NT20e Installation Guide)
3. Depress middle button of thermostat while closing the cover into the base.
4. Continue to press the middle button for at least 5 seconds after the cover is inserted into the base.
Failsafe Feature
The Proliphix Network Thermostats include an integral low temperature failsafe switch. The switch operates
in parallel with the thermostat and ensures that the heating system will be activated if the temperature falls
below 45oF (nominal) even in the absence of thermostat power. If the heating system retains power, yet the
thermostat loses power, the heating system will be cycled to maintain an above freezing temperature in the
property. The range on operation of the failsafe switch is between 39oF and 52oF.

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Thermostat Device Interface
The Proliphix thermostat features a convenient method of manually modifying certain parameters directly at
the thermostat. The thermostat’s front panel includes up and down arrows and several buttons located at
the bottom of the LCD to select the desired configuration settings. The following sections detail the
operation of the thermostat from the thermostat’s buttons and LCD screens.
Buttons and Screens
The basic layout of all thermostat buttons and a typical LCD screen are shown below in Figure 1.
LCD Screen
U
D
1
3
2
LMR
Figure 1 - Thermostat Interface
Button Definitions
U – Up Arrow (multiple uses, screen sensitive)
- Increases the setpoint temperature settings
- Scrolls up one field in multi-field screens
D – Down Arrow (multiple uses, screen sensitive)
- Decreases the setpoint temperature settings
- Scrolls down one field in multi-field screens
L – Left Button (multiple uses, screen sensitive)
- Selects the function as defined in the Button Field above it.
M – Middle Button (multiple uses, screen sensitive)
- Selects the function as defined in the Button Field above it.
R – Right Button (multiple uses, screen sensitive)
- Selects the function as defined in the Button Field above it.
Field Definitions
1 – Left Button Field
- Defines the function to be controlled by the Left button. In many screens this is labeled “Prev”
and allows for access back to the previous screen.
2 – Middle Button Field
- Defines the function to be controlled by the Middle button. In many secondary screens this is
labeled “Select” and allows for slection of the currently highlighted field on the screen.
3 – Right Button Field
- Defines the function to be controlled by the Right button. In many screens this is labeled
“Next” and allows for access to the next screen.
.

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LCD Screens
The content displayed on the LCD screens is organized into both Primary and Secondary Screens. There
are two Primary Screens on the NT10e and three Primary Screens on the NT20e thermostats. Both
Primary and Secondary Screens are defined below and in the following sections.
Primary & Secondary LCD Screens
1. Thermostat Screen (both NT10e and NT20e)
1.1. HVAC Screen
2. Sensor Status Screen (NT20e only)
3. Status & Control Screen (both NT10e and NT20e)
3.1. Thermostat Control
3.2. Thermostat Status
3.3. Alarm Status
3.4. Network Status
Thermostat Screen
The default LCD view displayed on the thermostat is the Thermostat Screen as shown in Figure 2 below.
This screen is constantly displayed with a minimal ambient backlight. The backlight will intensify after any
button is pressed. The LCD will revert back to Thermostat Screen sixteen seconds after the last button is
pressed.
Kitchen
Hold HVAC Next
72
73o
F68 Cool
Heat
Cool Day
10:45 am
1
4
5
23
6
Screen 1.0
Figure 2 – Thermostat Screen
The thermostat display will revert back to this Primary Screen after 16 seconds of keypad inactivity.

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Field Definitions – Thermostat Screen
1 – Zone Name (network host name)
- Initially this is set to the last six hex digits of the network MAC address (e.g. 00-00-6A). This
can be set by the user on the General Settings Page in the TMI.
2 – Alarm Indication
- When visible, indicates that an alarm condition exists within the thermostat.
Alarm conditions include, Low and High Temperature and Filter Change notifications.
3 – Network Connectivity
- When visible, indicates that the thermostat is connected to an active Ethernet network.
4 – Zone Temperature
- Indicates the current zone temperature in degrees Fahrenheit. If remote sensors are installed,
enabled and configured to average with the local thermostat sensor, this field will indicate the
average temperature of the aggregate sensors. (See Sensor Settings Page in the TMI chapter)
5 – Heat Setpoint Temperature
- Indicates the current heat setpoint temperature as defined by the thermostat schedule. This
will be grayed-out if only Cool is selected in HVAC mode. This will not be visible if the
thermostat is configured as a Cool only thermostat.
6 – Cool Setpoint Temperature
- Indicates the current cool setpoint temperature as defined by the thermostat schedule. This
will be grayed-out if only Heat is selected in HVAC mode. This will not be visible if the
thermostat is configured as a Heat only thermostat.
Screen 1.0
Kitchen
Hold HVAC Next
72
73o
F68 Cool
Heat
Cool Day
10:45 am
7
109
12
11
8
Figure 3 – Thermostat Screen (cont’d)

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Field Definitions – Thermostat Screen (cont’d)
7 – Time
- Time of day displayed in Daylight Savings Time if chosen.
8 – Temperature Hold
- Holds current temperature indefinitely. The Hold button toggles between Hold and Return.
Pressing the Return button disables the hold feature and returns to the temperature settings
which are set in the schedule.
(See Day Class Settings in the TMI chapter)
9 – HVAC Activity
- Displays the current state of the HVAC system. For either Fuel Burner or Heat Pump the
following are displayed;
Heat – Single stage heat is active.
Aux Heat - Auxiliary heat is active (Heat Pump).
Cool - Single stage cooling is active.
10 – HVAC Mode Control
- Enables the HVAC Secondary Screen whereby HVAC and Fan settings can be modified. (See
HVAC Screen below)
11 – Next
- Displays of the next thermostat screen, either Status & Control Screen or the Sensor Satus
Screen if remote sensors are installed and enabled.
12 – Period State
- Displays the current scheduled Period. The four schedule Periods are “Morn”(ing), “Day”,
“Eve”(ning) and “Sleep”.

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HVAC Screen
The HVAC screen is the first Secondary Screen and is a sub-screen of the default Thermostat Screen.
Most of the content on the HVAC screen is identical to the Thermostat Screen with the exception of the
HVAC and Fan mode controls. See Figure 4 below.
1
Kitchen
Fan Mode Back
73o
FCool Day
Auto 72
68 Cool
Heat
3
4
2
Screen 1.1
Figure 4 – HVAC Screen
Field Definitions – HVAC Screen
1 – Fan Setting
- Displays the current state of the fan.
Auto - The fan is controlled by either the Heat or A/C systems (or both).
On - Forces the fan to the on state independent of the Heat or A/C systems.
Kitchen
Select Cancel
72
73o
F68 Cool
Heat
Day
Auto
Off
Screen 1.1
Figure 5 – Fan Settings
2 – Fan Control
- Displays the options for changing the state of the fan. See Fan Settings.
3 – HVAC Mode
- Displays the options for changing the state of the HVAC System.

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Auto - Automatic changeover between the Heat or A/C systems.
Heat - Enables the Heating system only. The A/C system is disabled.
Cool - Enables the A/C system only. The Heating system is disabled.
Off - Disables the Heating and A/C systems.
Kitchen
Select Cancel
72
73o
F68 Cool
Heat
Cool Day
Auto
Heat
Cool
Off
Screen 1.1
Figure 6 – HVAC Settings
4 – Back
- Returns to the default Thermostat Screen.
5 – Cancel
- Clears the current active menu.

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The following image (Figure 7) displays an example of how the user could make HVAC setting changes at the
thermostat.
Figure 7 – HVAC Settings Change

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Sensor Status Screen
The Second Primary Screen is viewable in the NT20e model only if remote sensors are installed and
enabled. Because the NT10e does not support external thermal sensors, this page is NOT shown on
the NT10e Network Thermostat.
Sensor Status
Prev Next
Cool
Zone Average 72.6
Local Temp 72.3
Family Room 71.6
Dining Room 73.9
Screen 2.0
Figure 8 - Sensor Status Screen
Field Definitions – Sensor Status
Zone Average
- Average temperature of any combination of Local, Remote Sensor #1 (e.g. Family Room), and
Remote Sensor #2 (e.g. Dining Room). See TMI
Local Temp
- Current temperature of the sensor within the thermostat.
Remote Sensor #1 (e.g. Family Room)
- Current temperature of Remote Sensor #1.
Remote Sensor #2 (e.g. Dining Room)
- Current temperature of Remote Sensor #2.

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Status & Control Screen
The third Primary Screen is the Status & Control Screen. (This is the second Primary Screen on the NT10e
or NT20e if remote sensors are disabled.) Each status field is highlighted as the user navigates up or down
by pressing the Up or Down arrows. Selecting the desired status field is made by pressing the Select
button.
Status & Control
Prev Select Next
Thermostat Status
Alarm Status
Network Status
Screen 3.0
Thermostat Control
Figure 9 – Status & Control Screen
Field Definitions – Status & Control
Thermostat Control
- When highlighted and selected, takes the user to the Thermostat Control Secondary Screen
below.
Thermostat Status
- When highlighted and selected, takes the user to the Thermostat Status Secondary Screen
below.
Alarm Status
- When highlighted and selected, takes the user to the Alarm Status Secondary Screen below.
Network Status
- When highlighted and selected, takes the user to the Network Status Secondary Screen
below.

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Thermostat Control Screen
The Thermostat Control screen is a Secondary Screen which is a sub-screen of the Status & Control
Screen.
Selection of the HVAC system type can be made on this page. Status of the selected type along with the
default settings is also shown prominently. Changing specific parameters for each type can only be
achieved in the TMI (See TMI Advanced Settings page). In addition, a software reset may be applied to the
thermostat by pressing the left button (See Reset Actuations). See Figure 10 below.
Screen 3.1
Thermostat Control
Type Back
HVAC Type: Fuel Burner
Heat Ctrl: Enable
Cool Ctrl: Enable
Reset
1
2
Figure 10 – Thermostat Control Screen
Field Definitions – Thermostat Control
1 - Reset - Holding this button down for three seconds or greater will cause the thermostat to perform a
software reboot.
2 - Type - Provides selection of either Fuel Burner (default) or Heat Pump HVAC systems. When
selecting between either Fuel Burner or Heat Pump or between Heat Pump and Fuel
Burner, the HVAC Mode must be set to OFF prior to selecting the opposite setting.
(See HVAC Screen above or the Status & Control Page in the TMI Section.)
Fuel Burner - Selects fossil fuel systems which includes oil or gas fired boilers or
furnaces.
Heat Pump - Selects electric heat pump HVAC system type.

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Screen 3.1
Thermostat Control
Select Cancel
HVAC Type: Fuel Burner
Heat Ctrl: Enable
Cool Ctrl: Enable
Fuel Burner
Heat Pump
Figure 10b – Thermostat Control Screen
Please refer to the Advanced Settings Page in the TMI Section for further explanation of the following
parameters;
HVAC Type:
- Displays the selected HVAC system type; Fuel Burner or Heat Pump.
If Fuel Burner:
Heat Ctrl:
- Disable – No heating system is present.
- Enable – Heating is enabled.
Cool Ctrl:
- Disable – No cooling system is present.
- Enable – Cooling is enabled.
If Heat Pump:
Heat Ctrl:
- Disable – No heating system is present (i.e. air conditioning only)
- Enable – Heating is enabled.
- Aux Heat – Auxilary heat is enabled to augment the heat pump.
Cool Ctrl:
- Disable – No cooling system is present (i.e. heat only)
- Enable – Air conditioning is enabled.

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Thermostat Status Screen
The Thermostat Status screen is a Secondary Screen which is a sub-screen of the Status & Control Screen.
The content of the Thermostat Status Screen includes the current date, the product model number, the
software version, and the hardware revision. See Figure 11 below.
Screen 3.2
Thermostat Status
Back
Cool
Dec 31, 2004 – 8:30 pm
Model Number NT20
SW Version 1.0.00
HW Revision A.3
Figure 11 – Thermostat Status Screen
Alarm Status Screen
The Alarm Status screen is a Secondary Screen which is a sub-screen of the Status & Control Screen.
The content of the Alarm Status Screen includes the status of Low and High Temperature Limit alerts and
the Filter Reminder alert. (Refer to the TMI section below for further information on setting these
parameters.) See Figure 12 below.
Alarm Status
Back
Low Temp Limit: OK
Filter Change: OK
Screen 3.3
High Temp Limit: OK
Figure 12 – Alarm Status Screen

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Low Temp Limit
- Temperature below which an alarm indication is set by the thermostat.
oOK – Temperature of thermostat has not dropped below that set as Low
Temperature Limit
oNot OK - Temperature of thermostat has dropped below that set as Low
Temperature Limit
High Temp Limit
- Temperature above which an alarm indication is set by the thermostat.
oOK – Temperature of thermostat has not risen above that set as the High
Temperature Limit
oNot OK - Temperature of thermostat has risen above that set as the High
Temperature Limit
Filter Change Alert
- Indicates that the HVAC system requires service or the air handler filter need cleaning of
replacement.
oOK – Maintenance is not required.
oNow – Maintenance is reguired.
Network Status Screen
The Network Status screen is a Secondary Screen which is a sub-screen of the Status & Control Screen.
The content of the Network Status Screen includes the thermostat Host name, the unique Ethernet Media
Access Control (MAC) address, the Internet Protocol (IP) address, and the Web Port number required for
remote management. (Refer to the TMI section below for further information on setting these parameters.)
See Figure 13 below.
Network Status
Back
Cool
Host: Kitchen
Mac: 00:11:49:00:00:81
IP: 192.168.111.200
Web Port: 8200
Screen 3.4
Figure 13 – Network Status Screen