heat-timer SQ-Elite-8T Service manual

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SQ-Elite-8T & SQ-Elite-EXT
HYDRONIC SEQUENCING CONTROL
FOR HYDRONIC SYSTEMS
WARNING
The SQ-Elite is strictly an operating control. It CANNOT be used as a limit control. All boilers must have all
safety and limit controls required by code. It is the responsibility of the installer to verify that all the safety and
limits are working properly before the SQ-Elite is installed.
This control must be installed by a licensed electrician.
SQ-Elite-8T
SEQUENCING CONTROL
SYSTEM
DHW PUMP
PWR
L N
1 2
SYSTEM
3
DHW
PUMP
5
Stage A
7
Stage B
9
Stage C
11 13
Stage E
15
Stage F
17
Stage D
6 8 10 12 14 16 18
RS485
SYS=144F OD=35F
<AB >DE GH JK
HI LO -- OFF
4
Stage G
19
Stage H
21
OUTDOOR
TEMP
27 29 31
DHW
33 35
RETURN
TEMP
20 22 28 30 32 34 36
STAGE MENU
Stage E
Stage F
Stage G
Stage H
Stage A
Stage B
Stage C
Stage D
25 26 37 38
PROVE
SYSTEM
TEMP
PROGRAM RUN
23 24
COMB.
AIR
COMB. AIR
ENCLOSED
ENERGY
MANAGEMENT
EQUIPMENT
LISTED
99RA
C US
INPUT RATINGS: 120VAC 60Hz, 12VA MAX
Use Copper Conductors Only.
CAUTION: Risk of Electric Shock.
SENSORS MUST BE GOLD SERIES
OUTPUT RATING: 2A, 120VAC.
MAXIMUM 15A TOTAL FOR ALL CIRCUITS
DO NOT APPLY ANY VOLTAGE
TO INPUT TERMINALS
SHUTDOWN
/TSTAT
/SETBACK



2 Heat-Timer Corp.
SQ-ELITE-8T LAYOUT . . . . . . . . . . . . . . . . 3
SQ-ELITE-8T OVERVIEW . . . . . . . . . . . . . . . 4
 . . . . . 5
Reset Ratio/Outdoor Reset . . . . . . . . . . . . . . . . 5
PID Operation . . . . . . . . . . . . . . . . . . . . . . . 6
OSS Operation . . . . . . . . . . . . . . . . . . . . . . 6
Make Sure You Have the Right Control . . . . . . . . . . 7
 . . . . . . . . . . . . . . . . . . . . 7
Selecting the System Features . . . . . . . . . . . . . . 7
INSTALLATION . . . . . . . . . . . . . . . . . . . . 8
Mounting the Enclosure . . . . . . . . . . . . . . . . . . 8
Install the Sensors . . . . . . . . . . . . . . . . . . . . . 9
System Sensor Installation . . . . . . . . . . . . . . . . 9
Outdoor Sensor Installation . . . . . . . . . . . . . . . . 9
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Wiring the Power (Terminals 1, 2) . . . . . . . . . . . . 10
Wiring the Sensors . . . . . . . . . . . . . . . . . . . 10
Wiring the Domestic Hot Water (DHW) Sensor (Terminals 33,
34) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Wiring the Shutdown (Terminals 35, 36) . . . . . . . . 11
Wiring the T-STAT (Terminals 35, 36) . . . . . . . . . . 11
Wiring the Setback (Terminals 35, 36) . . . . . . . . . 11
Wiring the Prove (Terminals 37, 38) . . . . . . . . . . . 11
Wiring the System Output (Terminals 19, 20) . . . . . . 12
Wiring the DHW Pump (Terminals 21, 22) . . . . . . . 12
Wiring the Combustion Air Damper (Terminals 23, 24) . 12
Wiring the Stages (Terminals 3 to 17) . . . . . . . . . . 12
Connecting to the SQ-Elite-EXT Panels and 4-20mA EMS
Interface . . . . . . . . . . . . . . . . . . . . . . . . . 13
Selecting the SQ-Elite-EXT Panel Letter . . . . . . . . 13
INSTALLER MENU SEQUENCE . . . . . . . . . . . 14
Startup Settings . . . . . . . . . . . . . . . . . . . . . 17
Program Change Settings. . . . . . . . . . . . . . . . 17
Startup Sequence . . . . . . . . . . . . . . . . . . . . 17
Control Mode . . . . . . . . . . . . . . . . . . . . . . 17
Display Unit . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the 4mA and 20mA Set Points (Available in 4-20mA
EMS only) . . . . . . . . . . . . . . . . . . . . . . . . 17
Application. . . . . . . . . . . . . . . . . . . . . . . . 18
DHW Piping (Available with Heating Only) . . . . . . . 18
DHW Pump Output . . . . . . . . . . . . . . . . . . . 18
Combustion Air Damper Output . . . . . . . . . . . . . 18
External Input Mode . . . . . . . . . . . . . . . . . . . 18
Burner Type . . . . . . . . . . . . . . . . . . . . . . . 19
Boiler Output . . . . . . . . . . . . . . . . . . . . . . 19
Total Boilers . . . . . . . . . . . . . . . . . . . . . . . 19
Staging . . . . . . . . . . . . . . . . . . . . . . . . . 19
Sequence . . . . . . . . . . . . . . . . . . . . . . . . 19
Control Logic . . . . . . . . . . . . . . . . . . . . . . 20
Sensor Fault. . . . . . . . . . . . . . . . . . . . . . . 20
Setting the Control to Factory Defaults. . . . . . . . . 20
Operating Settings . . . . . . . . . . . . . . . . . . . . 21
Program Change Settings. . . . . . . . . . . . . . . . 21
Season . . . . . . . . . . . . . . . . . . . . . . . . . 21
Reset Ratio . . . . . . . . . . . . . . . . . . . . . . . 21
Customized Reset Ratio. . . . . . . . . . . . . . . . . 21
Set Point (Not Adjustable in EMS Mode) . . . . . . . . 22
Outdoor Cutoff Temperature. . . . . . . . . . . . . . . 22
Target Offset. . . . . . . . . . . . . . . . . . . . . . . 22
Minimum Target . . . . . . . . . . . . . . . . . . . . . 23
Maximum Target. . . . . . . . . . . . . . . . . . . . . 23
Boiler Minimum Return . . . . . . . . . . . . . . . . . 23
Minimum Return. . . . . . . . . . . . . . . . . . . . . 23
Return Lag. . . . . . . . . . . . . . . . . . . . . . . . 24
System Settings . . . . . . . . . . . . . . . . . . . . . 24
Program Change Settings. . . . . . . . . . . . . . . . 24
Stage Settings . . . . . . . . . . . . . . . . . . . . . . 24
Reaction Time . . . . . . . . . . . . . . . . . . . . . . 24
Purge Delay . . . . . . . . . . . . . . . . . . . . . . . 24
Minimum Runtime . . . . . . . . . . . . . . . . . . . . 24
Standby Delay. . . . . . . . . . . . . . . . . . . . . . 25
Last Stage Hold . . . . . . . . . . . . . . . . . . . . . 25
Throttle Range. . . . . . . . . . . . . . . . . . . . . . 25
Lead Settings . . . . . . . . . . . . . . . . . . . . . . . 26
Lead Boiler . . . . . . . . . . . . . . . . . . . . . . . 26
Rotate Mode. . . . . . . . . . . . . . . . . . . . . . . 26
Setback Schedule . . . . . . . . . . . . . . . . . . . . 26
Setback . . . . . . . . . . . . . . . . . . . . . . . . . 26
Boost . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Boost Period. . . . . . . . . . . . . . . . . . . . . . . 27
Day/Night Schedules . . . . . . . . . . . . . . . . . . 27
Set Present Time . . . . . . . . . . . . . . . . . . . . 28
DHW Settings . . . . . . . . . . . . . . . . . . . . . . . 28
DHW Priority Timer (Available with Parallel DHW Piping)2 8
DHW Set Point (Requires an Optional DHW Temperature
Sensor) . . . . . . . . . . . . . . . . . . . . . . . . . 28
 29
Run-On . . . . . . . . . . . . . . . . . . . . . . . . . 29
Pump Exercise . . . . . . . . . . . . . . . . . . . . . 29
Maintenance . . . . . . . . . . . . . . . . . . . . . . . 30
System & Outdoor Sensor Trim . . . . . . . . . . . . . 30
History. . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Conguration . . . . . . . . . . . . . . . . . . . . . . 30
Display and Buttons . . . . . . . . . . . . . . . . . . . 30
Boiler/C.Unit Settings . . . . . . . . . . . . . . . . . . 32
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 32
RunTime. . . . . . . . . . . . . . . . . . . . . . . . . 32
TROUBLESHOOTING. . . . . . . . . . . . . . . . . 33

DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . 34
USER MENU SEQUENCE. . . . . . . . . . . . . . . 35
Program Change Settings. . . . . . . . . . . . . . . . 35
Season . . . . . . . . . . . . . . . . . . . . . . . . . 35
Set Point (Not Adjustable in EMS Mode) . . . . . . . . 36
Reset Ratio . . . . . . . . . . . . . . . . . . . . . . . 36
Customized Reset Ratio. . . . . . . . . . . . . . . . . 36
Outdoor Cutoff Temperature. . . . . . . . . . . . . . . 37
Setback . . . . . . . . . . . . . . . . . . . . . . . . . 37
Day/Night Schedules . . . . . . . . . . . . . . . . . . 37
 . . . . . . . . . . . . . . . . . . 40
Contents

SQ-Elite-8T & SQ-Elite-EXT Installation Manual 3
SQ-Elite-8T
SEQUENCING CONTROL
SYSTEM
DHW PUMP
PWR
L N
1 2
SYSTEM
3
DHW
PUMP
5
Stage A
7
Stage B
9
Stage C
11 13
Stage E
15
Stage F
17
Stage D
6 8 10 12 14 16 18
RS485
SYS=144F OD=35F
<AB >DE GH JK
HI LO -- OFF
4
Stage G
19
Stage H
21
OUTDOOR
TEMP
27 29 31
DHW
33 35
RETURN
TEMP
20 22 28 30 32 34 36
STAGE MENU
Stage E
Stage F
Stage G
Stage H
Stage A
Stage B
Stage C
Stage D
25 26 37 38
PROVE
SYSTEM
TEMP
PROGRAM RUN
23 24
COMB.
AIR
COMB. AIR
Connect to Extension panels to
add additional stages or connect
to 4-20mA EMS Interface for
external set point.
When connecting Temperature Sensors, no
Polarity is observed. Prove terminals
must be connected for SQ-Elite to
operate stages.
Button function is presented on
bottom row of the display.
LEDs indicate
associated relay’s status
Program Switch to restrict access
to function changes. This Switch is
covered with Enclosure Wiring Cover.
System Output controls pumps,
valves, or other system components.
DHW Pump and Comb. Air relays are
controlled when configured.
Output Relays to manage the stages.
SHUTDOWN
/TSTAT
/SETBACK
ENCLOSED
ENERGY
MANAGEMENT
EQUIPMENT
LISTED
99RA
C US
INPUT RATINGS: 120VAC 60Hz, 12VA MAX
Use Copper Conductors Only.
CAUTION: Risk of Electric Shock.
OUTPUT RATING: 2A, 120VAC.
MAXIMUM 15A TOTAL FOR ALL CIRCUITS
DO NOT APPLY ANY VOLTAGE
TO INPUT TERMINALS
SQ-ELITE-8T LAYOUT

4 Heat-Timer Corp.
SQ-ELITE-8T OVERVIEW

The SQ-Elite-8T is the perfect control whenever multiple boiler or chiller stages are required for hydronic heating or cooling applications.
The SQ-Elite-8T controls the stages and their pumps or valves to maintain a precise system set point.

The SQ-Elite’s control algorithm allows it to look at the rate of change in the system. If the load is changing quickly, the SQ-Elite can
be set to OSS sequencing where it will react based on load changes. If the system oscillation is minimal as in heating applications, the
SQ-Elite will make slow and gradual output adjustments. Therefore, the SQ-Elite adapts to specic system requirements and minimizes
oscillation around the set point.

The SQ-Elite’s alphanumeric digital display names each system parameter in simple English and shows its precise value. The easy to
follow menu system allows users to quickly make changes to any system setting without having to learn any specialized codes or key
commands.
AUTOMATIC ROTATION AMONG STAGES
Rotating the rst stage to be activated on a call for output promotes even wear on each unit. The SQ-Elite has three modes of rotation:
Manual, First-On/First-Off (FOFO), or Time. The Time rotates the lead stage every selected period from every hour to every 41 days.

With its Outdoor reset feature, the SQ-Elite-8T is capable of changing its temperature target based on the outdoor temperature. It offers
several parameters that can be used to ne tune the reset curve; Offset, Minimum, and Maximum Targets, and Night Setback Schedule
or Setback using an External Signal. Furthermore, a customizable outdoor reset curve has been incorporated for unique applications
where standard reset ratios will not sufce.

Any of the SQ-Elite-8T heating or cooling units can be congured as a Standby with an adjustable Standby delay. Assigning a specic
unit to work in standby mode will remove it from the rotation. In this mode, the unit will be used for backup in large demand periods
where the primary units will not sufce.

These outputs work with the control logic to operate a primary system pump and a combustion air damper. In addition, a System Prove
input can be wired in to check the status of either of the components energized by the outputs before the stages can be activated.

The SQ-Elite can sequence heating or cooling units as needed. For heating systems where higher efciency is achieved using lower
ring stages, the SQ-Elite offers the Parallel Sequencing option. It sequences all the low ring stages rst before bringing the rest of the
stages on. For other types of heating and cooling units, using the Normal Sequencing option brings the lower operating stage followed
by the higher one of the lead unit. That will be repeated for each of the lag units.

Unlike many boilers where, to re a multi-stage boiler both low and high stage relays must be energized, some of the available cooling
units require that the operation of the higher stages turn off the lower operating stages. This can be achieved by selecting Single from
the Startup Staging menu.

As a stand-alone, the SQ-Elite-8 is designed to control eight stages. However, it has the capability of expanding its control to two extension
panels (SQ-Elite-EXT) each with eight stages. Thus, the SQ-Elite can control a total of up to 24 stages.

Using a smart algorithm, the SQ-Elite-8T can monitor the boiler return temperature using an optional return sensor mounted on the return
line. Then, sequence the boilers to raise the return temperature above an adjustable Minimum Return.

Having a DHW input either as a dry contact to be used with an external aquastat or as a temperature sensor that can be ordered separately,
the SQ-Elite-8T can control a DHW pump using its built-in DHW Pump output relay. The user will have different priority options that
varies based on the DHW piping design.

SQ-Elite-8T & SQ-Elite-EXT Installation Manual 5

The SQ-Elite-8T has multiple operating modes that satisfy most hydronic systems. In heating
when the Outdoor Reset is selected, it can change the System Set Point based on outdoor
temperature. Or, it can be set to Set Point and sequence stages to achieve a manually adjusted
Set Point in either heating or cooling.
In Outdoor Reset, the SQ-Elite-8T controls a hot water heating system to provide a building
with comfortable and even heat levels. The SQ-Elite varies the Target temperature of the
circulating heating water in response to changes in the outdoor temperature.
The SQ-Elite-8T also controls the system circulating pump with an adjustable Outdoor Cutoff.
In heating, when the outdoor temperature is above the Outdoor Cutoff, the System Pump will
be off and no heating water is circulated through the system. When the outdoor temperature
drops below the Outdoor Cutoff, the system pump relay is energized and the heating water
starts to circulate through the system. The temperature of the heating water is controlled by
the Reset Ratio parameters or the Set Point. In cooling applications, the SQ-Eite-8T turns off
the cooling units and System Pump when the outdoor temperature rises above the Outdoor
Cutoff setting.
RESET RATIO/OUTDOOR RESET
When a building is being heated, heat escapes through the walls, doors, and windows to
the colder outside air. The colder the outside temperature, the more heat escapes. If you
can input heat into the building at the same rate that it is lost out of the building, then the
building temperatures will remain constant. The Reset Ratio is an adjustment that lets
you achieve this equilibrium between heat input and heat loss.
The starting point for most systems is the 1.00 (OD):1.00 (SYS) (Outdoor Temperature
: Heating Water Temperature) ratio. This means that for every degree the outdoor
temperature drops, the temperature of the heating water will increase one degree. The
starting point of the curves is adjustable, but comes factory selected at 70°F Outdoor
Temp. and 100°F Water Temp. For example with a 1.00 (OD):1.00 (SYS) ratio, if the
outdoor temperature is 50°F, this means the temperature has fallen 20°from the starting
point of 70°F. Therefore, the heating water temperature will increase 20°to 120°F.
Each building has different heat loss characteristics. A very well insulated building will
not lose much heat to the outside air, and may need a Reset Ratio of 2.00 (OD):1.00
(SYS) (Outdoor:Water). This means the outdoor temperature would have to drop 2
degrees to increase the water temperature 1 degree. On the other hand, a poorly insulated
building with insufcient radiation may need a Reset Ratio of 1.00 (OD):2.00 (SYS).
This means that for each degree the outdoor temperature dropped the water temperature
will increase 2 degrees. The SQ-Elite has a full range of Reset Ratios to match any
buildings heat loss characteristics.
A heating curve that relies not only on Outdoor temperature but also on the type of
radiation will improve heat comfort. The following are suggested initial settings for
different types of radiation based on average building insulation and heat loss. The
contractor can ne tune these adjustments based on the specic building need.
Type of Radiation in Building Reset Ratio Offset
Radiators (Steel & Cast Iron) 1.00 (OD) : 1.00 (SYS) 0˚F
Baseboard (Finned copper tube& Cast Iron) 1.00 (OD) : 1.00 (SYS) 0˚F
Radiant (High Mass/Concrete) 4.00 (OD) : 1.00 (SYS) -10˚F
Radiant (Low Mass/Joists) 2.00 (OD) : 1.00 (SYS) -10˚F
Fan Coils & Air Handlers 1.00 (OD) : 1.00 (SYS) 20˚F
Outdoor Temperature
Water Temperature
70 405060
130
120
110
100
Outdoor Temperature
Water Temperature
70 405060
110
100
90
80
Outdoor Temperature
Water Temperature
70 405060
150
140
130
120
1:4
With a 0° Offset, the
ratio curves begin at
100° Water Temperature.
With a -20° Offset, the
ratio curves begin at
80° Water Temperature.
With a +20° Offset, the
ratio curves begin at
120° Water Temperature.
1:4
1:4 1:1
1:1
1:1
4:1
4:1
4:1
90
100
+20 Offset
-20 Offset
(O) Outdoor Temperature (in °F)
70 60 50 40 20
30 0 -10
10 -20
100
120
11 0
130
140
150
160
180
170
190
200
210
220
1:3 1:2 1:1.5
1:1.25
1:1
1.25:1
1.5:1
2:1
3:1
4:1
(S) Water Temperature (in °F)
Reset Ratio Curves
Reset Ratio is Presented as
Outdoor Temp.(O) : Water Temp.(S) Ratio
1:4
8:1
WARNING
When controlling a non condensing

temperature must be set to the boiler


go below such temperature.

6 Heat-Timer Corp.
The SQ-Elite-8T has multiple operating modes that satisfy most hydronic systems. It can sequence stages to achieve an adjustable Set
Point or an Outdoor Reset Ratio (in heating applications only). Moreover, when used with the 4-20mA EMS Interface (HT# 926741-00)
it can accept a 4-20mA signal as a set point. The 4-20mA EMS Interface must be purchased separately. This gives the SQ-Elite-8T the
capability of being controlled remotely.

PID control logic is primarily used for building heating or cooling. The logic will utilize two primary settings to add or subtract stages.
The Reaction Time is used to turn on/energize stages. On the other hand, the Minimum Runtime is used to turn off/de-energize stages. In
heating applications, a call for heat, by either closing the TSTAT input or opening the SHUTDOWN input, and when the outdoor temperature
is below the Outdoor Cutoff, the SQ-Elite-8T will turn on/energize the lowest ring stage of the Lead Boiler to start the Purge Delay.
After the elapse of the purge period, the SQ-Elite-8T will start calculating the Reaction Period. If after a full Reaction Time the control
logic foresee additional stages are needed, the SQ-Elite-8T will energize the following stage. If that stage was another boiler, that boiler
has to go through a full Purge Delay before starting to calculate the Reaction Time for that stage. Otherwise, if the next stage was the
higher ring stage on the same boiler, the Reaction Time will start from the moment the higher ring stage relay is energized.
When the SQ-Elite-8T PID logic foresees that the system will overshoot, regardless of the current system and target values, it will make
sure that the last stage turned on/energized has elapsed a full Minimum Runtime before it is turned off/de-energized. Except for the
lead stage, no additional stages will be turned off/de-energized until another full Minimum Runtime is elapsed. On the other hand, if
the last stage is a lead stage, it will remain energized until the system reading exceeds the target set point by the Last Stage Hold value
in addition to satisfying the Minimum Runtime condition. That is, if the Set Point was 150°F and the Last Stage Hold was set to 10°F,
the lead stage will remain energized until the system reaches 160°F and a full Minimum Runtime elapses. This is useful in protecting
the lead stages from short cycling.

OSS is used in fast reacting application as in process applications, where maintaining a set point is critical. The OSS utilizes the Throttle
setting, as a mean to calculate the number of stages the SQ-Elite-8T shall have on at any point. For every Throttle Range below the set
point an additional stage shall be turned on/energized. That is, if the set point was 180°F and the Throttle setting was 5°F, if the System
dropped below 175°F (180°F - 5°F), the lead stage will energize. With further decrease in the system value to 170°F (180°F - 5°F - 5°F),
the second stage will energize.
As the system temperature rises towards the set point, stages will turn off. Using the previous example, when the system rise to 175°F
boiler B will de-energize leaving only boiler A on. Boiler A will remain on until the system rises a one full Throttle range above the set
point. This will leave the lead boiler A on until the temperature rises to 185°F then turn off/de-energize.
Throttling Example in Heating Mode
°F °F 
Falling Temperature Rising Temperature
Temperature Calculation Stage Turned On Stages On Stage Turned Off Stages On
185°F180 + (1)THR --- None A None
180°F 180 - (0)THR --- None --- A
175°F 180 - (1)THR A A B A
171 to 174°F --- --- A --- A,B
170°F 180 - (2)THR B A,B C A,B
166 to 169°F --- --- A,B --- A,B,C
165°F 180 - (3)THR C A,B,C D A,B,C
161 to 165°F --- --- A,B,C --- A,B,C,D
160°F 180 - (4)THR D A,B,C,D --- A,B,C,D

SQ-Elite-8T & SQ-Elite-EXT Installation Manual 7
MAKE SURE YOU HAVE THE RIGHT CONTROL
If you need the SQ-Elite to do additional tasks that either are not listed or do not know how to congure them, contact Heat-Timer
Corp. Sales Department either by Phone [phone], Fax [phone], or by E-mail [e-mail].

Having an Initial Setup Program will ease the conguration of the SQ-Elite-8T and will provide the opportunity to utilize many of the
energy saving features and give more comfortable heat when needed.
The program should consist of the following:
• Selecting the features that your system can utilize
• Installation: Install the Control, switches and sensors
• Setting the System Startup
• Setting the System Settings
• Setting the Stages
• Adjusting Reset Ratio and Water Offset (In Reset Mode Only)
SELECTING THE SYSTEM FEATURES
The SQ-Elite-8T has been designed with Hydronic heating and cooling as the primary purpose. With this in mind, many of the SQ-Elite-
8T features can be utilized to ease, enhance, and improve your system performance. Some of these features are listed in this section.

• The SQ-Elite-8T is equipped to control multiple multi-stage boilers or chillers with or without pumps or valves for heating or cooling
application.
• That, combined with the capability of energizing only a single stage of a multi-stage cooling unit when in high demand, makes the
SQ-Elite-8T versatile for many industries.

• The SQ-Elite-8T can control the System Temperature either by adjusting the target according to the Outdoor Temperature (Outdoor
Reset) or by maintaining an adjustable Set Point. The Outdoor Reset option, available in heating only, uses an Outdoor Sensor
(supplied with the control) and achieves better fuel savings in addition to better comfort.
• Using the optional 4-20mA EMS Interface (HTC# 926741-00), the SQ-Elite-8T can receive an external set point through an EMS
system.

• The SQ-Elite PID can be used for applications where system reaction is slow and requires a long period to achieve or measure the
results. However, OSS, can be used for applications where the load changes frequently and the sequencing must match the load and
its immediate change.
NUMBER OF STAGES
• The SQ-Elite can be congured to control up to eight stages. It can control up to 24 stages using a maximum of two SQ-Elite-EXT
Extension Panels, each with eight stages.

• The SQ-Elite-8T can control multiple stages in addition to unit pumps or valves.

• The control of the DHW is based on either a temperature sensor, can be purchased separately, on the DHW source or using a dry
contact from an aquastat. The SQ-Elite-8T provides multiple DHW Priority options based on the DHW piping. The Combustion Air
Damper output can be used in conjunction with the PROVE input to check the status of the Combustion Air Damper's End Switch,
System Pump's Flow Switch, or any other operating device before any stage is energized.
MONITOR BOILER RETURN
• The optional return line sensor, can be purchased separately, can be connected in heating applications to monitor and help protect
the boilers from thermal shock and condensation caused by cool returns.

8 Heat-Timer Corp.
AUTOMATIC ROTATION AMONG BOILERS
• Rotating the lead unit to be activated on a call for output promotes even wear on all units. The SQ-Elite has three modes of rotation:
Manual, First-On-First-Off, or Timed Rotation. This option automatically rotates the units every selected period from one hour to
every 41 days (999 hours).
SETBACK/BOOST OR DAY/NIGHT SCHEDULING
Two Setback modes are available for the SQ-Elite:
• The Day/Night Scheduling provides an adjustable time-based schedule for the Setback. It will be available when Shutdown or Tstat
is selected from the External Input Startup menu options. See page 18.
• When Setback is selected from the External Input Startup menu options, an external signal can be used to switch the operation of
the SQ-Elite-8T in and out of setback mode. See page 18.
• The Boost can be used to bring the building to comfortable temperature settings after a Night or Setback period. It does that by increasing
the target temperature in heating or decreasing it in cooling application for an adjustable period that follows the setback.
INSTALLATION
Each of the SQ-Elite and SQ-Elite-EXT consists of three primary enclosure
components.
• TheEnclosureDisplayModule: contains the display, buttons, LEDs,
and electric wiring terminals. It has two screws to hold it to the base. A
program conguration switch, used to adjust SQ-Elite settings, is placed
above the terminals. This switch is enclosed with the Enclosure Wiring
Cover for security. The wiring terminals are of the plug-in type to ease
installation and removal.
• TheEnclosureBase: contains the holes to mount and hold the control
against the wall or any at surface. All other enclosure components mount
on the base. The bottom section of the Enclosure Base contains the wiring
chamber with knockouts on the bottom to ease installation.
• TheEnclosureWiringCover: seals the wires from the external
environment. It has two screws to hold it to the base and a hole to secure
a lock on the wiring enclosure. A plastic web that separates the wiring
chamber into high and low volt sections has been provided.
MOUNTING THE ENCLOSURE
• Select a location near the equipment to be controlled.
• The surface should be at and sufciently wide and strong to hold the SQ-
Elite or SQ-Elite-EXT.
• Keep the control away from extreme heat, cold, or humidity. Ambient
operating temperature is from 20 to 120°F.
• Remove the Enclosure Wiring Cover from the control enclosure by
removing the two bottom screws.
• Remove the Enclosure Display Module by removing the middle screws.
• Screw the Enclosure Base to the surface through the upper and lower
mounting holes on the back of the enclosure.
• Replace the Enclosure Display Module and replace the middle screws.
• Do not replace the enclosure wiring cover until all wiring is done.
• When purchasing a padlock for the enclosure, the maximum shank diameter
should not exceed ¼"
Mounting Base
Display Mounting Screws Wiring Cover Mounting Screws
Enclosure Display Module
Enclosure Wiring Cover Enclosure Base
Hole for optional
Padlock (not supplied)

SQ-Elite-8T & SQ-Elite-EXT Installation Manual 9
INSTALL THE SENSORS
SYSTEM SENSOR INSTALLATION
LOCATING THE SYSTEM SENSOR
• Put the System sensor approximately 10' feet past the last heating/cooling unit
on the common supply header but before any takeoffs.
• The sensor must be located where it sees the output of all the stages. If a unit
is piped so that the sensor does not see its output, the SQ-Elite-8T will not
sequence the units correctly.
• Only use a Standard Brass Tube sensor (HTC #904250-00).
• The sensor wires can be extended up to 500' using a shielded 2-conductor
cable (Belden #8760 or equivalent (#18/2)). Do not ground the shield at the
sensor but at the panel using one of the terminals marked with an “O”.
• Do not run sensor wires in conduit with line voltage wiring.

• Install a 3/8"ID immersion well (HT #350147-00 or 904011-00).
• Insert the sensor probe of the supplied sensor into the well.

• Strap the sensor to the pipe using metal clamps. Do not over tighten the
clamp. The sensors's concave surface must be facing the pipe for better
temperature reading.
• Strap pipe insulation around the sensor and pipe.
Immersion Well
3/8" ID 1/2" NPT
Heating System
Sensor
Common Supply Pipe
Sensor Probe
Immersion Heating System Sensor
Shield
Common Supply Pipe
Sensor Probe
Strap-On Heating System Sensor
Shield
Pipe Insulation
ALERT
If the System Sensor can not sense the
correct system water temperature being
supplied to the building, the SQ-Elite
will not provide comfortable heat/cool
levels. Be sure that it is located on the
main supply pipe which can not easily be
isolated from the system.
OUTDOOR SENSOR INSTALLATION
• Only use the Heat-Timer sensor included with the unit (HT# 904220-00).
• Locate the sensor in the shade on the north side of the building. The sensor
should never be in direct sunlight.
• Be sure the location is away from doors, windows, exhaust fans, vents, or
other possible heat sources.
• The sensor should be mounted approximately 10' feet above ground level.
• Adhere the Outdoor Label provided to the back of the sensor base.
• Use the Enclosure Base bottom knockout for the conduit. Use the locknut to
hold the conduit and enclosure base together. Screw the cover to the base.
• If screws are used to afx the enclosure to the wall, make sure to seal around
the sensor and wall except from the bottom.
• The sensor wires can be extended up to 500' using shielded 2-conductor cable
(#18/2). Do not ground the shield at the sensor but at the control using the
terminal marked with an “O”.
• Do not run sensor wires in conduit with line voltage wiring.
WARNING
The SQ-Elite is an operating control only. All equipment must have
all safety and limit controls required by code. It is the responsibility
of the installer to verify that all the safety limits are working properly
before the SQ-Elite is installed.
Outdoor
Sensor
snap-in
location
Shield
not connected
Conduit
Outdoor Label
on back of Sensor
Outdoor Sensor
Mounting
screws
location
Seal around
sensor and wall
Outdoor
drip-hole
ALERT
Determining the proper location for the Outdoor Sensor is very important. The SQ-Elite will base its operation



10 Heat-Timer Corp.
WIRING

• Bring the 120VAC 60Hz power wires through the bottom Knockout of the enclosure.
• Class 1 voltage wiring must enter the enclosure through a different opening from any Class 2 voltage wiring.
• Connect the hot line to the terminal marked L.
• Connect the neutral line to the terminal marked N.
WARNING
Class 1 voltage wiring must enter the enclosure through a different opening from any Class 2 voltage
wiring. Heat-Timer recommends installing a surge suppressor on the power source to the SQ-Elite.
Line
Neutral
120VAC
Power Source
PWR
L N
1 2
WARNING
Connect the Temperature sensor shield at the control to the sensor terminal marked "O".
Do not connect the Shield at the sensor end.
27 2928 3025 26
TEMP
Sensor Shiled
System Sensor
OUTDOOR
TEMP
WIRING THE SENSORS

• The SQ-Elite is designed to be connected to a temperature sensor (HT #904250-00) for immersion in a
3/8ID well (HT #350147-00 or 904011-00) located on the common header. Contact the factory for additional
temperature sensor options.
• Temperature sensor wires can be extended up to 500’ by splicing shielded 2-conductor cable (Belden #8760 or
equivalent (#18/2)).
• Temperature sensors have no polarity. Connect the two wires from the sensor to the SQ-Elite-8T terminals
marked SYSTEM TEMP 27, 28.
• Connect the shield to the circled terminal 28 with one of the sensor wires. Do not connect the shield at the
sensor end.

• When Outdoor Reset is selected, the SQ-Elite-8T will vary the system target based on the outdoor temperature.
• Whether in Set Point or Outdoor Reset modes, the outdoor sensor can be used as an Outdoor Cutoff. In heating,
the SQ-Elite-8T will disable all Boilers when the outdoor temperature is above the adjustable Outdoor Cutoff
temperature. However, in cooling it will disable the units when the outdoor temperature is below the Outdoor
Cutoff. This feature will automatically be activated when an outdoor sensor is connected.
• For an outdoor sensor, use a Heat-Timer outdoor sensor (HT #904220-00).
• The sensor wires can be extended up to 500’ using shielded 2-conductor cable (Belden #8760 or equivalent
(#18/2)).
• Temperature sensors have no polarity. Connect the wires from the outdoor sensor to the SQ-Elite-8T terminals
marked OUTDOOR TEMP - 29, 30. Connect the shield to the circled terminal 30 with one of the sensor wires.
Do not connect the shield at the sensor end.
Sensor Shiled
Outdoor Sensor
27 29 31
DHW
3328 30 32
TEMP
OUTDOOR
TEMP
RETURN
TEMP

• If the Return Sensor is connected, must be purchased separately, the SQ-Elite-8T will recognize it and alternate
its temperature on the display with the Target temperature. If the Return temperature is below the Minimum
Return, the SQ-Elite-8T will sequence stages based on the Return Sensor, Minimum Return, Calculated Target,
and the actual System Temperature.
• The Return on the SQ-Elite-8T is designed to be connected to a temperature sensor that can be purchased
separately (HT #904250-00) for immersion in a 3/8ID well (HT #350147-00 or 904011-00).
• The sensor wires can be extended up to 500’ using shielded 2-conductor cable (Belden #8760 or equivalent
(#18/2)).
• Temperature sensors have no polarity. Connect the wires from the outdoor sensor to the SQ-Elite-8T terminals
marked OUTDOOR TEMP - 31, 32.
• Connect the shield to the circled terminal 32 with one of the sensor wires. Do not connect it to the sensor.
29 31
DHW
3330 32 34
Sensor Shiled
Return Sensor
OUTDOOR
TEMP
RETURN
TEMP

SQ-Elite-8T & SQ-Elite-EXT Installation Manual 11

• The DHW input can be used to raise system Set Point to 200°F or Maximum Target, whichever is lower. The
DHW Piping on page 18 must be selected from the Startup Menu to determine the DHW Priority options.
• DHW Call terminals can be connected to either a dry-contact or a temperature sensor that can be purchased
separately (HT #904250-00) for immersion in a 3/8ID well (HT #350147-00 or 904011-00)
• If using a dry contact, wire an aquastat or other controls to provide dry-contact closure on the DHW terminals.
• If using a sensor, the sensor wires can be extended up to 500’ using shielded 2-conductor cable (Belden #8760 or
equivalent (#18/2)).
• Temperature sensors have no polarity. Connect the wires from the DHW sensor to the SQ-Elite-8T terminals
marked DHW - 33, 34. Connect the sensor shield to the circled terminal 34 with one of the sensor wires. Do not
connect the shield to the sensor.
• If Shutdown was selected as the External Input, any DHW call will be ignored when the Shutdown is active.
Sensor Shiled
DHW Sensor
DHW
33 35
32 34 36 37
PROVE
SHUTDOWN
/TSTAT
/SETBACK
RETURN
TEMP

• This feature will only be available when Shutdown is selected as the External Input Mode option from the
Startup menu on page 18.
• This feature can be used whenever it is desirable to turn off the SQ-Elite-8T stage outputs from a remote location
or another controller (i.e. EMS input).
• When the Shutdown is enabled, all active stages will immediately turn off. The System Pump, Combustion Air,
and unit pumps' or valves' relays will remain energized for the Run-On delay period and then turn off.
• The Shutdown signal must be a dry contact input. No voltage can be placed across the SHUTDOWN terminals.
• Bring the two wires from the dry contact to the SHUTDOWN- 35,36 terminals.
• When Shutdown is selected, Setback will be available using the programmed Day/Night schedule.
DHW
33 35
34 36 37 38
PROVE
Sensor Shiled
Shutdown
Dry Contact
SHUTDOWN
/TSTAT
/SETBACK

• This feature can be used whenever it is desirable to switch the SQ-Elite-8T to operate from a remote location
(i.e. EMS input or thermostat). It will only be available when Tstat is selected as the External Input Mode option
from the Startup menu on page 18.
• When the Tstat is enabled by closing a dry contact, the SQ-Elite-8T will activate the heating/cooling logic.
• The Tstat signal must be a dry contact only. No voltage can be placed across the TSTAT terminals.
• Bring the two wires from the dry contact to the TSTAT- 35,36 terminals.
• When Tstat is selected from the Startup External Input mode, Setback will be available using the programmed
Day/Night schedule.
33 3532 34 36 37 38
Auxiliary
PROVE
SHUTDOWN
/TSTAT
/SETBACK
Auxiliary
Input3
T-Stat
Dry Contact

• This feature can be used whenever it is desirable to switch the SQ-Elite to operate in Setback from a remote
location (i.e. EMS input or external time clock). It will only be available when Setback is selected as the
External Input Mode option from the Startup menu. See page 18.
• When the Setback is enabled by closing a dry contact, the Target will change by the Setback value. That is, in
Heating, the Target will be reduced by the Setback value. On the other hand, in Cooling, the Setback will be
added to the Set Point.
• The Setback signal must be a dry contact only. No voltage can be placed across the SETBACK terminals.
• Bring the two wires from the dry contact to the SETBACK- 35,36 terminals.
• When Setback is selected, No Day/Night Scheduling will be available.
DHW
33
SHUTDOWN
/TSTAT
/SETBACK
3534 36 37 38
PROVE
Setback
Dry Contact

• The Prove feature is provided to check system component operation before energizing the stages. It can be
used to check on the Combustion Air Damper by connecting it to the end switch of the damper. In this case, the
Comb. Air Output option must be activated from the Startup Menu on page 18.
• If the Comb. Air Damper Output option was not activated, the PROVE input can be used to check on the System
Output. A typical use of this feature is to check for system pump ow before energizing any stage.
• If the PROVE input is open on a call, the SQ-Elite will enable only the System Output. All stage outputs will be
off when the PROVE input is open.
• A factory-installed jumper provides the System Prove signal. Do not remove the jumper unless it will be
replaced by a System Prove signal.
• Bring the two wires from the dry contact to the PROVE - 37, 38 terminals. No voltage can be placed across the
PROVE terminals
Prove
Dry Contact
RS485
35 36 37 38
PROVE
SHUTDOWN
/TSTAT
/SETBACK

12 Heat-Timer Corp.
WARNING
The PROVE input cannot be used as a safety limit. All equipment must have its own certied limit and safety
controls as required by local codes. No boiler stage will start unless the Prove terminals are shorted. DO NOT
remove the PROVE jumper supplied unless replacing it with a Prove signal.

• The System output has a Normally Open (N.O.) relay that acts as a dry-contact. It does not source any power.
• Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.
SystemOutputOperationinSetPointMode
• In Heating, the System output relay will energize whenever the outdoor temperature drops below the Outdoor
Cutoff or whenever a stage output is active. If no outdoor sensor is connected and the last boiler relay has de-
energized, the System relay will remain energized for a period set by the Run-On and then de-energize.
• If the PROVE input is Open, the System relay will remain energized however, all stages will be de-energized.
If a Prove is not required, the factory-installed jumper must remain connected for proper operation.
System
Pump
SYSTEM
DHW
PUMP
15 17
16 18
Stage G
19
Stage H
21
20 22
L
N
• In Cooling applications, the system relay will energize when the outdoor temperature is above the Outdoor Cutoff setting.
• A typical use of the System output is to activate a system pump or its starter. The pump can run whenever there is a call for
heat/cool. When stages are no longer required, the pump will stay active for an adjustable Run-On delay and then de-energize.
SystemOutputOperationinResetMode
• The System output relay will energize whenever the outdoor temperature is below the Outdoor Cutoff.
• When the outdoor temperature rises 2°F above the Outdoor Cutoff, the System output will remain energized for the period set
by the System Run-On and then de-energize.

The SQ-Elite-8T can control the DHW Pump when the DHW Pump Output option is activated from the Startup
Menu. See page 18.
• The SQ-Elite-8T will energize the DHW Pump whenever there is a call for DHW using a dry contact or when
the DHW temperature falls below the DHW Set Point and DHW Differential when using a DHW sensor.
• The DHW Pump output relay is a Normally Open (N.O.) dry contact. It does not source any power.
• Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.
• If Shutdown was selected as the External Input (page 18), The Sq-Elite-8T will ignore a DHW call when the
Shutdown is active.
DHW
Pump
DHW
PUMP
17 18 19
Stage H
2120 22 23 24
COMB.
AIR
SYSTEM
L
N

The SQ-Elite-8T can control the Combustion Air Damper when the Comb. Air Output option is activated in the
Startup Menu (Page 18). In addition, the PROVE input will function as the Combustion Air Damper status checker.
• The SQ-Elite will energize the Combustion Air Damper relay whenever there is a call to energize any of the
unit stages.
• The Combustion Air output relay is a Normally Open (N.O.) dry contact. It does not source any power.
• Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.
DHW
PUMP
2120 22 23 24
COMB.
AIR
SYSTEM
Comb.
Air
Damper
L
N

The SQ-Elite can be congured to operate the stages of the heating or cooling units. Moreover, it can
be congured to operate the unit pumps or valves in addition to the unit stages.
• The relays are N.O. dry contacts only. They do not source any voltage.
• Wire the N.O. relay contacts in series with the unit’s limit circuit.
• Class 1 voltages must enter the enclosure through a different knockout from any Class 2 voltage
wiring.

• Each Stage output (A through H) has one (N.O.) relay.
• When wiring several multi-stage units, start with the lower stage of the rst unit and wire it to
Output A, followed by the higher stage of the same unit and wire it to Stage B.
3 5
Stage A
7
Stage B
9
Stage C
11
Stage E
Stage D
6 8 10 12
4
Lo Hi
Unit1
Stages
Lo Hi
Unit2
Stages

SQ-Elite-8T & SQ-Elite-EXT Installation Manual 13

• If the SQ-Elite-8T is congured to operate Stage Pumps or Valves. They, must be wired to the
stage output after the highest stage for that unit. That is, the low stage for the rst unit must be
connected to A and the higher stage of the same unit must be connected to Stage B. The unit
valve or pump for the same unit must be connected to Stage C.
PWR
N
23 5
Stage A
7
Stage B
9
Stage C
11 13
Stage E Stage F
Stage D
6 8 10 12 14
4
Lo Hi
Unit1
Stages
Unit1
Pump
Lo Hi
Unit2
Stages
Unit2
Pump
L
N

• The SQ-Elite is equipped with a phone socket (RS485) to connect to the SQ-Elite-EXT Extension panels or the 4-20mA EMS
Interface using the provided 6-pin phone cable.
• Each SQ-Elite-EXT Extension has two RS485 communication ports. Use one to connect to the SQ-Elite. Use the other port to
connect to the second extension or the 4-20mA EMS Interface.
• Additional compatible devices can utilize the second RS485 connection on the second SQ-Elite-EXT Extension. An example
would be to use the 4-20mA EMS Interface (HT# 926741-00) to provide a 4-20mA set point signal to the SQ-Elite.

• The SQ-Elite is capable of communicating to two SQ-Elite-EXT Extensions. However, each
extension must be identied as either A or B using the switch on each extension to avoid having
communication problem.
• Extension A (Switch is set to "A") will operate stages "I" through "P". While Extension B
(Switch is set to "B") will operate stages "Q" through "X".
Ext A Ext B
Connecting SQ-Elite to Two Extension Panels
and 4-20mA EMS Interface using RS485
SQ-Elite
SQ-Elite-8
SEQUENCING CONTROL
SYSTEM
DHW PUMP
INPUT RATINGS:
115VAC 60Hz, 12VA MAX
Use Copper Conductors Only.
CAUTION: Risk of Electric Shock.
PWR
L N
1 2
SENSORS MUST BE GOLD SERIES
SYSTEM
3
DHW
PUMP
5
Stage A
7
Stage B
9
Stage C
11 13
Stage E
15
Stage F
17
Stage D
6 8 10 12 14 16 18
RS485
SYS=144F OD=35F
<AB >DE GH JK
HI LO -- OFF
4
Stage G
19
Stage H
21
OUTDOOR
TEMP
27 29 31
DHW
33
SHUTDOWN
/TSTAT
/SETBACK
35
RETURN
TEMP
20 22 28 30 32 34 36
STAGE MENU
Stage E
Stage F
Stage G
Stage H
Stage A
Stage B
Stage C
Stage D
25 26 37 38
PROVE
SYSTEM
TEMP
PROGRAM RUN
23 24
COMB.
AIR
DO NOT APPLY ANY VOLTAGE TO INPUT TERMINALS
COMB. AIR
SQ-Elite-EXT
SEQUENCING CONTROL EXTENSION
O
P
Power
CAUTION: Risk of Electric Shock.
PWR
L N
1 2
I
3 4
J
5 6
K
7 8
L
9 10
M
11 12
EXTENSION
MODULE
RS-485
Ext A
INPUT RATINGS:
115VAC 60Hz, 12VA MAX
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL
FOR ALL CIRCUITS
Ext B
L
M
N
Comm
T
U
V
W
X
N
13 14
Q S UR T V
SQ-Elite-EXT A
Use Copper Conductors Only.
I
J
K
Q
R
S
O
15 16
P
17 18
W X
O
P
Power
CAUTION: Risk of Electric Shock.
PWR
L N
1 2
I
3 4
J
5 6
K
7 8
L
9 10
M
11 12
EXTENSION
MODULE
RS-485
Ext A
INPUT RATINGS:
115VAC 60Hz, 12VA MAX
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL
FOR ALL CIRCUITS
Ext B
L
M
N
Comm
T
U
V
W
X
N
13 14
Q S UR T V
SQ-Elite-EXT B
Use Copper Conductors Only.
I
J
K
Q
R
S
O
15 16
P
17 18
W X
4-20 mA EMS
4-20mA INPUT
+Signal GND
123
RS485
EXTENSION
CONNECTORS
4-20mA EMS Interface
4-20mA
EMS Signal
(+)
(-)
6 Pin Phone Cable (provided with Extension)
6 Pin Phone Cable (provided with 4-20mA EMS Interface)
SQ-Elite-EXT
SEQUENCING CONTROL EXTENSION

14 Heat-Timer Corp.
------ SETTINGS ------
Season Winter
<Outdoor Rst> 135 F
Set Point 135 F
EMS Set Point135 F
Min Return 110 F
<System Settings>
<Maintenance>
<System Startup>
BACK SELECT
INSTALLER MENU SEQUENCE
SYS=168 F OD=45 F
TGT=172 F
ABC <EFG >
---- LO
BOILER MENU
---- CONTROL MODE ---
Outdoor Reset
Set Point
EMS 4-20mA
BACK SAVE
---- DISPLAY UNIT ---
F
C
BACK SAVE
EMS 4mA SET POINT
100 F
[ ]
BACK SAVE
---- APPLICATION ---
Heat-BreakOnRise
Cool-MakeOnRise
BACK SAVE
EMS 20mA SET POINT
170 F
[ ]
BACK SAVE
---- DHW PIPING ---
Parallel
Primary/Secondary
BACK SAVE
--DHW PUMP OUTPUT--
N o
Yes
BACK SAVE
--COMB. AIR OUTPUT--
N o
Yes
BACK SAVE
--- BURNER TYPE ----
On/Off
2-Stage
3-Stage
4-Stage
BACK SAVE
-- BOILER OUTPUT --
None
Pump
Valve
BACK SAVE
-- TOTAL BOILERS --
8
[ ]
BACK SAVE
------ STAGING ------
Multiple Outputs
Single Output
BACK SAVE
------ SEQUENCE -------
Lo/Hi/Lo/Hi
Lo/Lo/Hi/Hi
BACK SAVE
--- CONTROL LOGIC---
PID
OSS
BACK SAVE
--- SENSOR FAULT ---
Stages On
Stages Off
BACK SAVE
ARE YOU SURE?
N o
Yes
BACK SAVE

---- MAINTENANCE ----
Unit F
Present Time12:30P
<Sensor Trim>
<Histories>
<Configuration>
BACK SELECT
--- SENSOR TRIM ----
System Trim +0 F
Outdoor Trim +0 F
Return Trim +0 F
DHW Trim +0 F
BACK SELECT
Sys=120 F 10:00AM
BACK NEXT
SQ-ELITE-8T V1.00
Outdoor reset
Heating-BreakOnRise
Day/Night Schedule
DHW Parallel
BACK SELECT
ALERT
• To access Installer Menu, hold
down the Menu button for over
three seconds.
• To be able to change the SQ-
Elite settings the Program/Run
Switch must be set to Program.

MAINTENANCE
-- EXTERNAL INPUT -
Shutdown
Tstat
Setback
BACK SAVE

SQ-Elite-8T & SQ-Elite-EXT Installation Manual 15
----- SETTINGS ------
Season Winter
<Outdoor Rst> 135 F
Set Point 135 F
EMS Set Point135 F
Min Return 110 F
<System Settings>
<Maintenance>
<System Startup>
BACK SELECT
---- SEASON ---
Winter
Summer
BACK SAVE
-- OUTDOOR RESET -
Reset Ratio 7
Target Offset +0 F
Outdoor Cutoff 65 F
Min.Target 120 F
Max.Target 120 F
BACK SELECT
---- RESET RATIO ---
Custom
1(8.00 OD:1.00 SYS)
2(4.00 OD:1.00 SYS)
3(3.00 OD:1.00 SYS)
4(2.00 OD:1.00 SYS)
5(1.50 OD:1.00 SYS)
6(1.25 OD:1.00 SYS)
7(1.00 OD:1.00 SYS)
8(1.00 OD:1.25 SYS)
9(1.00 OD:1.50 SYS)
10(1.00 OD:2.00 SYS)
11(1.00 OD:3.00 SYS)
12(1.00 OD:4.00 SYS)
BACK SAVE
-- SET SYS TEMP.1 -
100 F
[
]
BACK SAVE
-- AT OD TEMP.1 ---
70 F
[
]
BACK SAVE
-- SET SYS TEMP.2 -
170 F
[ ]
BACK SAVE
-- AT OD TEMP.2 ---
0 F
[ ]
BACK SAVE
-- TARGET OFFSET ---
+0 F
[ ]
BACK SAVE
-- OUTDOOR CUTOFF --
70 F
[ ]
BACK SAVE
---- MIN TARGET ----
70 F
[ ]
BACK SAVE
---- MAX TARGET ----
240 F
[ ]
BACK SAVE
----- SET POINT -----
70 F
[ ]
BACK SAVE
-- EMS SET POINT --
140 F
BACK SAVE
- SYSTEM SETTINGS -
<Stage Settings>
<Setback Schedule>
<DHW Settings>
Setback 0 F
Run-On 2min
Pump Exercise Off
BACK SELECT
---- MIN RETURN ----
120 F
[ ]
BACK SAVE
---- RETURN LAG ----
2min
[ ]
BACK SAVE
--- PUMP EXERCISE --
Off
On
BACK SAVE
------- RUN-ON -------
2min
[ ]
BACK SAVE
------ SETBACK -------
0 F
[ ]
BACK SAVE
-- DHW SETTINGS ---
DHW Temp. 120 F
DHW Prior Tmr 60min
DHW Set Point120 F
DHW Diff. 5 F
BACK SELECT
DHW PRIORITY TIMER
30min
[ ]
BACK SAVE
-- DHW SET POINT --
120 F
[ ]
BACK SAVE
DHW DIFFERENTIAL
10 F
[
]
BACK SAVE
SYS=168 F OD=45 F
TGT=172 F
ABC <EFG >
---- LO
BOILER MENU
DHW SETTINGS
RESET RATIO


16 Heat-Timer Corp.
----- SETTINGS ------
Season Winter
<Outdoor Rst> 135 F
Set Point 135 F
EMS Set Point 135 F
Min Return 110 F
<System Settings>
<Maintenance>
<System Startup>
BACK SELECT
- SYSTEM SETTINGS -
<Stage Settings>
<Setback Schedule>
<DHW Settings>
Setback 0 F
Run-On 2min
Pump Exercise Off
BACK SELECT
-- STAGE SETTINGS --
Reaction Time 1min
Purge Delay 0.0min
Min Runtime 2min
Standby Delay 10min
Last Stage Hold 5 F
Throttle 2 F
<Lead Settings>
BACK SELECT
-- LEAD SETTINGS --
Lead Boiler AB
Rotate Mode Time
BACK SELECT
-- REACTION TIME --
2min
[
]
BACK SAVE
--- PURGE DELAY ----
0.0min
[ ]
BACK SAVE
- MINIMUM RUNTIME -
2min
[
]
BACK SAVE
-- STANDBY DELAY --
10min
[
]
BACK SAVE
LAST STAGE HOLD
0 F
[ ]
BACK SAVE
SYS=168 F OD=45 F
TGT=172 F
ABC <EFG >
---- LO
BOILER MENU
----- BOILER AB -----
Mode Auto
Runtime 58Hrs
<Prev Boiler>
<Next Boiler>
BACK SAVE
-- BOILER AB MODE -
Auto
Standby
Off
On
BACK SAVE
BOILER AB RUNTIME
58hrs
BACK CLEAR OK
SETBACK SCHEDULE
Setback 0 F
Present Time **:**
Day Schdul 7:00Am
Night Schdul 7:00Pm
BACK SELECT
------ SETBACK -------
0 F
[ ]
BACK SAVE
-- NIGHT SCHEDULE --
07:**Pm
BACK SAVE
-- DAY SCHEDULE ----
07:**Am
BACK SAVE
- SET PRESENT TIME
**:**
BACK SAVE
-- LEAD BOILER --
A B
CD
BACK SELECT
-- LEAD ROTATION --
Time
Manual
FOFO
BACK SELECT
AUTO ROTATE PERIOD
24hrs
[ ]
BACK SAVE
-------- BOOST ---------
0 F
[ ]
BACK SAVE
------ BOOST PERIOD---
30min
[
]
BACK SAVE
-- THROTTLE RANGE --
2 F
[ ]
BACK SAVE
STAGE SETTINGS
SCHEDULES
Not Available when Setback is
Selected from Startup Menu.
STAGE MENU

SQ-Elite-8T & SQ-Elite-EXT Installation Manual 17

Can be accessed by holding down the Menu
button for over three seconds.

To be able to change the SQ-Elite settings the Program/Run Switch must be set to Program.
The switch is located under the Enclosure Wiring Cover for security. The Enclosure Wiring
Cover can be securely closed using a padlock.
PROGRAM RUN

Hold Button: MENU/<System Startup>
• When powered, the SQ-Elite performs a self-test on its components. After the self-test
diagnostics have been successfully completed, the SQ-Elite will initialize the panel.
• On the rst power up, the System Startup screen will appear after the initialization is
complete. If it doesn’t, the SQ-Elite has already been congured.
ARE YOU SURE?
N o
Yes
BACK SAVE
• The System Startup menu sets the main parameters as the type of sensor, the type of output whether heating or cooling, the
sequencing mode, and many other parameters described in this section.
• Before entering the Startup menu, several warnings will alert you to the consequences of making Startup changes.
CONTROL MODE
OutdoorReset,SetPoint,EMS4-20mA Default:OutdoorReset
Hold Button: MENU/<System Startup>/..../Control Mode
• Outdoor Reset provides a variable set point based on outdoor temperature. Available for
Heating applications only.
• Outdoor Reset mode requires the use of an outdoor sensor. DO NOT select Outdoor
Reset without an outdoor sensor.
---- CONTROL MODE ---
Outdoor Reset
Set Point
EMS 4-20mA
BACK SAVE
• Set Point mode does not require an outdoor sensor. If an outdoor sensor is connected in Set Point mode it will be used only as
an Outdoor Cutoff point. That is, to turn the stages, system, and Comb. Air relays off.
• The EMS 4-20mA allows the SQ-Elite-8T to receive an external set point from an EMS/BMS system. This option requires the
use of the 4-20mA EMS Interface (HT# 926741-00).
• You must select the 4mA (min) and 20 mA (max) Set Point values in the following screens.
• Connect the 4-20mA EMS Interface to the SQ-Elite-8T RS485 connection using the phone cable provided with the 4-20mA
EMS interface.

ºF,ºC Default:ºF
Hold Button: MENU/<System Startup>/..../Display Unit
• The SQ-Elite-8T can control boilers and chillers in hydronic environment where the
temperature is the critical factor. It allows the user to display temperature information
and settings in either ºF (Fahrenheit) or ºC (Celsius). Select the display unit that is best
suited for your application.
---- DISPLAY UNIT ---
F
C
BACK SAVE

4mAfrom-10ºF/-23ºCto240ºF/116ºC Default:100ºF/38ºC
20mAfrom-10ºF/-23ºCto240ºF/116ºC Default:170ºF/77ºC
Hold Button: MENU/<System Startup>/..../EMS 4mA Set Point/EMS 20mA Set Point
• If EMS 4-20mA is selected from the Control Mode menu as the temperature set point
source, the user must purchase a Heat-Timer 4-20mA EMS Interface (HT# 926741-00) to
accept the 4-20mA signal and transmit it to the SQ-Elite-8T.
EMS 4mA SET POINT
100 F
[ ]
BACK SAVE
• In addition, the user will need to set the temperature range parameters. First, set the 4mA
temperature set point, then the 20mA temperature set point.
• To shutdown the control using the EMS signal, send a signal that is above or below the
2-22mA range. The display will show the message "Shutdown by EMS" and all
stages will de-energize. However, the System, Comb. Air, and Unit Pumps and Valves
will continue for the Run-On delay period and then de-energize.
EMS 20mA SET POINT
170 F
[ ]
BACK SAVE
ALERT
A good practice after performing any Startup menu modications is to
check all operating settings and adjustments to match the new settings.

18 Heat-Timer Corp.

Heating-BreakOnRise,Cooling-MakeOnRise Default:Heating-BreakOnRise
Hold Button: MENU/<System Startup>/..../Application
• The SQ-Elite-8T offers two application modes, Heating and Cooling. In Heating, the
SQ-Elite will sequence stages and when the system temperature is below the set point. In
addition, the system relay will energize when the outdoor temperature is at or below the
Outdoor Cutoff setting.
---- APPLICATION ---
Heat-BreakOnRise
Cool-MakeOnRise
BACK SAVE
• In Cooling, the SQ-Elite-8T will sequence stages and when the system temperature is above the set point. In addition, the
system relay will energize when the outdoor temperature is at or above the Outdoor Cutoff setting.
• No Return Temperature monitoring or DHW options will be available in cooling applications.

Parallel,Primary/Secondary Default:Parallel
Hold Button: MENU/<System Startup>/..../DHW Piping
• When Parallel is selected, the SQ-Elite-8T will offer a DHW Priority Timer. The DHW
priority will only take place during heating periods. See the DHW Priority Timer on
page 28.
---- DHW PIPING ---
Parallel
Primary/Secondary
BACK SAVE
• The priority will allow the DHW Pump relay to energize while de-energizing the System relay when there is a DHW call during
heating. However, during Summer, only the DHW Pump relay will energize on a DHW call.
• Selecting the Primary/Secondary option will energize the System relay with the DHW Pump relay whenever there is a call for
DHW even during the Summer or when outdoor temperature is above the Outdoor Cutoff. No priority will be available.
ALERT
A DHW call can be initiated by either a dry contact or using a Heat-Timer Sensor (HT #904220-00
or 904250-00) for immersion in a 3/8ID well (HT #350147-00 or 904011-00). The use of a sensor
will allow the adjustment of the DHW Set Point and DHW Differential.

No,Yes Default:Yes
Hold Button: MENU/<System Startup>/..../DHW Pump Output
• The SQ-Elite-8T can control the operation of the DHW Pump. This option allows the
user to select if the SQ-Elite-8T should be controlling the DHW Pump or not.
--DHW PUMP OUTPUT--
N o
Yes
BACK SAVE

No,Yes Default:Yes
Hold Button: MENU/<System Startup>/..../Comb. Air Output
• The SQ-Elite can control the operation of the Combustion Air Damper. This option
allows the user to select if the SQ-Elite should be controlling the Combustion Air
Damper or not.
- COMB. AIR OUTPUT-
N o
Yes
BACK SAVE
• If Yes is selected, the SQ-Elite will energize the Comb. Air relay whenever there is a call for a boiler and will use the PROVE
input to check on the status of the Combustion Air Damper. When the last stage is de-energized, the Comb. Air relay will
remain energized for the Run-On period and then de-energize.
• On a prove failure situation, the message "Wait for Comb. Prove". No boiler stages will be active until the Prove
input is Shorted.
• If Prove fails after the boiler stages where energized, the stages will de-energize and the message "Comb. Prove
Failure" will display until the situation is rectied.
• If No is selected, the PROVE input will be used to check System status instead of the Combustion Air Damper.

Shutdown,Tstat,Setback Default:Shutdown
Hold Button: MENU/<System Startup>/..../External Input
• The Shutdown function allows the SQ-Elite-8T to receive a remote Shutdown signal to
terminals 35 and 36 to turn off all relays including all boilers stages.
• When Shutdown is selected, DHW calls will be ignored unless the control is out of
Shutdown.
-- EXTERNAL INPUT -
Shutdown
Tstat
Setback
BACK SAVE

SQ-Elite-8T & SQ-Elite-EXT Installation Manual 19
• The Tstat option gives terminals 35 and 36 the capability of functioning as a heat-call. That is, when terminals 35 and 36 are
shorted, the SQ-Elite-8T will sequence the stages. However, when they are opened, all stages will turn off.
• Setback is used to lower the set point when less load is required during nights and weekends.
• For setback operation, the SQ-Elite-8T can either utilize its built-in night schedule, available when Shutdown or Tstat is selected
as the External Input, or an external dry contact signal to switch to setback by selecting Setback from this menu.

On/Off,2-Stage,3-Stage,4-Stage Default:On/Off
Hold Button: MENU/<System Startup>/..../Burner Type
• The SQ-Elite can sequence from a single stage and up to four stages per heating or
cooling unit. Select the option based on your boiler or cooling number of stages.
--- BURNER TYPE ----
On/Off
2-Stage
3-Stage
4-Stage
BACK SAVE

None,Pump,Valve Default:None
Hold Button: MENU/<System Startup>/..../Boiler Output
• When None is selected, the SQ-Elite-8T will sequence multiple heating or cooling units
without any additional unit pumps or valves.
• The Pump option allows the SQ-Elite-8T to control the cooling or heating unit stages in
addition to the unit pumps. The pump stage will run for the Run-On delay after the lower
stage of that unit has de-energized.
-- BOILER OUTPUT --
None
Pump
Valve
BACK SAVE
• The Valve option functions similar to the pump option except that when all stages are off and after the Run-On delay has
elapsed, the Lead unit's valve relay will remain energized to allow for pump ow across the system. The lead unit's valve will
remain energized until the Outdoor temperature rises above the Outdoor Cutoff or when the Shutdown or Summer is activated.
TOTAL BOILERS
from1to24 Default:variesbasedonBurnerTypeandBoilerOutput
Hold Button: MENU/<System Startup>/..../Boiler Output
• This option in combination with Burner Type and Boiler Output Startup options will
determine the total number of outputs the SQ-Elite will need to control.
• If the total number of stages selected, including unit pumps or valves, is more than the
control and extension stages, the additional units containing these stages will have CE as
their status and will seize to operate.
-- TOTAL BOILERS --
8
[ ]
BACK SAVE
STAGING
MultipleOutputs,SingleOutput Default:MultipleOutputs
Hold Button: MENU/<System Startup>/..../Staging
• Most units will require that the higher output stages be energized after the lower output
stages. These units will need to select the Multiple Output option. That means, both
Low and High Output stages must be energized to achieve the unit's maximum output.
• Some units require that when the higher output stages are required, the lower stages must
de-energize. To operate these units, the user must select the Single Output option.
------ STAGING ------
Multiple Outputs
Single Output
BACK SAVE
SEQUENCE
Lo/Hi/Lo/Hi,Lo/Lo/Hi/Hi Default:Lo/Hi/Lo/Hi
Hold Button: MENU/<System Startup>/..../Sequencing
• Some units run more efcient when the lower stages are energized alone than with the
higher stages. These types of units should select Lo/Lo/Hi/Hi. Then, the SQ-Elite will
sequence the lower stages of all Automatic units before sequencing the higher stages.
------ SEQUENCE -------
Lo/Hi/Lo/Hi
Lo/Lo/Hi/Hi
BACK SAVE
• For the rest of the unit types, the Lo/Hi/Lo/Hi should allow the staging of the lower stage of the lead unit followed by the higher
stage of the same unit. Then when more stages are needed, it will re the lower stage of the lag unit followed by the higher
stage of the lag unit.

20 Heat-Timer Corp.
CONTROL LOGIC
PID,OSS(Over-Sized-System) Default:PID
Hold Button: MENU/<System Startup>/..../Sequencing
• The PID option allows the SQ-Elite to sequence stages based on the Reaction Time and
the Boiler Minimum Run Time. The PID relies on the rate of change in the System
Temperature. The PID logarithmic calculations foresee changes and sequence stages
based on those changes. It is the most efcient operation for most heating and cooling
applications.
--- CONTROL LOGIC---
PID
OSS
BACK SAVE
• The Oversize option sequence stages based on how many Throttling ranges (differentials) is the system temperature away
from the Target Temperature. In Heating and at one Throttling range below the Set Point, only one stage will be on. For
each additional Throttling range below the Set Point, an additional stage will be activated. The last stage on will be allowed
to exceed the Set Point by one Throttling range before turning off that stage. This helps to prevent the last stage from short
cycling.
When PID is Selected, the following are the settings that directly affects this modes operation:
• Reaction Time (pg 24) SELECT Settings/System Settings/Stage Settings/Reaction Time
• Purge Delay (pg 24) SELECT Settings/System Settings/Stage Settings/Purge Delay
• Minimum Run Time (pg 24) SELECT Settings/System Settings/Stage Settings/Min Runtime
• Standby Delay (pg 25) SELECT Settings/System Settings/Stage Settings/Standby Delay
• Last Stage Hold (pg 25) SELECT Settings/System Settings/Stage Settings/Last Stage Hold
When Oversize (OSS) is Selected, the following are the settings that directly affects this modes operation:
• Throttle (pg 25) SELECT Settings/System Settings/Stage Settings/Throttle
SENSOR FAULT
StagesOn,StagesOff Default:StagesOn
Hold Button: MENU/<System Startup>/..../Sensor Fault
• The Sensor Fault will determine the operating status of all output stages set to Auto or
Standby when a sensor reads Short or Open.
--- SENSOR FAULT ---
Stages On
Stages Off
BACK SAVE
• The Shutdown or Tstat activation will take precedence over the Sensor Fault status. That means, if Stages On is selected and
the Shutdown was active, all stages will be Off on a sensor fault.
RESET MODE
• When Stages-On is selected, the SQ-Elite-8T will turn all unit stages On when the System reads Short or Open and the
Outdoor is below the Outdoor Cutoff. When the Outdoor reads Short or Open, the SQ-Elite-8T will change the Target to
the Maximum Target.
• When Stages-Off is selected, the SQ-Elite-8T will turn all stages Off when the System reads Short or Open. However,
when the Outdoor reads Short or Open, the SQ-Elite-8T will change the Target to the Minimum Target.

• When Stages-On is selected, the SQ-Elite-8T will turn all stages On when the System sensor reads Short or Open.
• When Stages-Off is selected, the SQ-Elite-8T will turn all stages Off when the System sensor reads Short or Open.
• The Outdoor Sensor Short or Open status will not affect the control operation in Set Point mode.
SETTING THE CONTROL TO FACTORY DEFAULTS
To Reset the SQ-Elite control to its original factory defaults, power down the control. Hold
down the two right most buttons while powering the control back up until the Total
Clear Started screen appears. The Display will direct you to the Startup menu to
program the control after the defaults are loaded.
TOTAL CLEAR STARTED
Release buttons
and
Please Wait
NOTE: When resetting the control to original factory defaults all control settings will be overwritten and will no longer exist.
ALERT
Do not turn off power to control until all Startup settings have been made. Otherwise, the next
power-up will be set to many Startup factory settings that might not t your application.