heat-timer SQ-Elite-8S Service manual

R










SQ-Elite-8S
SEQUENCING CONTROL
SYS
AUX OUT
PWR
L N
1 2
SYS
3
AUX
OUT
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
13PSI 35F
<AB> CD EF GH
HI LO -- OFF
4
Stage G
19
Stage H
21
Aux liary
Input2
27 29 31 33 35
Outdoor
Temp
20 22 28 30 32 34 36
Stage E
Stage F
Stage G
Stage H
Stage A
Stage B
Stage C
Stage D
25 26
System
4 20mA
+
37 38
PROVE
PROGRAM RUN
23 24
COMB
AIR
COMB. AIR
ENCLOSED
ENERGY
MANAGEMENT
EQU PMENT
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
Auxiliary
Input1
Aux liary
Input3

2 Heat-Timer Corp.

               3
             4
    5
PID Operation . . . . . . . . . . . . . . . . . . . 5
OSS Operation. . . . . . . . . . . . . . . . . . . 5
                   6
Selecting the System Features . . . . . . . . . . . 6
                   7
Mounting the Enclosure . . . . . . . . . . . . . . . 7
Install the Sensors . . . . . . . . . . . . . . . . . . 8
System Pressure Sensor Installation . . . . . . . 8
Outdoor Sensor Installation . . . . . . . . . . . . 8
Wiring . . . . . . . . . . . . . . . . . . . . . . . . 9
Wiring the Power (Terminals 1, 2) . . . . . . . . . 9
Wiring the Inputs . . . . . . . . . . . . . . . . . . . 9
System Pressure Sensor Wiring (Terminals 25, 26) 9
Outdoor Sensor Wiring (Terminals 29, 30). . . . . 9
Wiring the Shutdown (Terminals 35, 36) . . . . . . 9
Wiring the T-STAT (Terminals 35, 36) . . . . . . . 10
Wiring the Setback (Terminals 35, 36) . . . . . . . 10
Wiring the Prove (Terminals 37, 38) . . . . . . . . 10
Wiring the Outputs . . . . . . . . . . . . . . . . . . 10
Wiring the System Output (Terminals 19, 20) . . . 10
Wiring the Combustion Air Damper (Terminals 23, 24) .
10
Wiring the Stages (Terminals 3 to 17) . . . . . . . 11
Connecting to the SQ-Elite-EXT Panels and 4-20mA
EMS Interface . . . . . . . . . . . . . . . . . . . 11
Selecting the SQ-Elite-EXT Panel Letter . . . . . 11
         12
              14
Program Change Settings . . . . . . . . . . . . . 14
Startup Sequence . . . . . . . . . . . . . . . . . 14
Control Mode . . . . . . . . . . . . . . . . . . . 14
Sensor Type . . . . . . . . . . . . . . . . . . . . 14
Display Standard. . . . . . . . . . . . . . . . . . 14
Setting the 4mA and 20mA Set Points (Available in
4-20mA EMS only) . . . . . . . . . . . . . . . . . 14
Combustion Air Damper Output . . . . . . . . . . 15
External Input Mode . . . . . . . . . . . . . . . . 15
Burner Type . . . . . . . . . . . . . . . . . . . . 15
Total Boilers . . . . . . . . . . . . . . . . . . . . 15
Staging. . . . . . . . . . . . . . . . . . . . . . . 15
Sequence . . . . . . . . . . . . . . . . . . . . . 16
Control Logic. . . . . . . . . . . . . . . . . . . . 16
Sensor Fault . . . . . . . . . . . . . . . . . . . . 16
Setting the Control to Factory Defaults . . . . . . . 16
Operating Settings . . . . . . . . . . . . . . . . . . 17
Program Change Settings . . . . . . . . . . . . . 17
Season. . . . . . . . . . . . . . . . . . . . . . . 17
Set Point (Not Adjustable in EMS Mode) . . . . . 17
Outdoor Cutoff Temperature . . . . . . . . . . . . 17
System Settings . . . . . . . . . . . . . . . . . . . 17
Program Change Settings . . . . . . . . . . . . . 18
Stage Settings . . . . . . . . . . . . . . . . . . . . 18
Reaction Time . . . . . . . . . . . . . . . . . . . 18
Purge Delay . . . . . . . . . . . . . . . . . . . . 18
Minimum Runtime . . . . . . . . . . . . . . . . . 18
Standby Delay . . . . . . . . . . . . . . . . . . . 18
Last Stage Hold . . . . . . . . . . . . . . . . . . 19
Lead Settings . . . . . . . . . . . . . . . . . . . . 19
Lead Boiler. . . . . . . . . . . . . . . . . . . . . 20
Rotate Mode . . . . . . . . . . . . . . . . . . . . 20
Setback Schedule . . . . . . . . . . . . . . . . . . 20
Setback . . . . . . . . . . . . . . . . . . . . . . 20
Day/Night Schedules . . . . . . . . . . . . . . . 21
Set Present Time . . . . . . . . . . . . . . . . . 21
Combustion Air Damper Operation . . . . . . . . . 21
Run-On . . . . . . . . . . . . . . . . . . . . . . 21
System Exercise . . . . . . . . . . . . . . . . . . 21
Maintenance . . . . . . . . . . . . . . . . . . . . . 21
System & Outdoor Sensor Trim . . . . . . . . . . 22
History . . . . . . . . . . . . . . . . . . . . . . . . 22
Conguration. . . . . . . . . . . . . . . . . . . . 22
Display . . . . . . . . . . . . . . . . . . . . . . . 22
Boiler Settings . . . . . . . . . . . . . . . . . . . . 23
Mode . . . . . . . . . . . . . . . . . . . . . . . . 23
Runtime . . . . . . . . . . . . . . . . . . . . . . 24
Pressure Transducer Default Settings and Ranges2 4
              25
            26
Program Change Settings . . . . . . . . . . . . . 26
Season. . . . . . . . . . . . . . . . . . . . . . . 26
Set Point (Not Adjustable in EMS Mode) . . . . . 27
Outdoor Cutoff Temperature . . . . . . . . . . . . 27
Setback . . . . . . . . . . . . . . . . . . . . . . 27
Day/Night Schedules . . . . . . . . . . . . . . . 27
                2

SQ-Elite-8S & SQ-Elite-EXT Installation Manual 3
SEQUENCING CONTROL
SYS
AUX OUT
PWR
L N
1 2
SYS
3
AUX
OUT
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
4
Stage G
19
Stage H
21
Auxiliary
Input2
27 29 31 33 35
Outdoor
Temp
20 22 28 30 32 34 36
Stage E
Stage F
Stage G
Stage H
Stage A
Stage B
Stage C
Stage D
25 26
System
4 20mA
+
37 38
PROVE
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
Auxiliary
Input1
Auxiliary
Input3
Connect to Extension panels to
add additional stages or connect
to 4-20mA EMS Interface for
external set point.
When connecting Pressure Sensors,
Polarity is observed. However, when connecting
Temperature Sensors, no Polarity is observed.
Prove terminals must be connected for
SQ-Elite-8S 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 system components.
Comb. Air relay is
controlled when configured.
Output Relays to manage the stages.
13PSI 35F
<AB> CD EF GH
HI LO -- OFF
SQ-Elite-8S


4 Heat-Timer Corp.


The SQ-Elite-8S is the perfect control whenever multiple boilers are required for steam heating applications. The SQ-Elite-8S controls
the stages to maintain a precise system set point.

The SQ-Elite-8S’s control PID algorithm allows it to look at the rate of change in the system. If the system oscillation is minimal, the SQ-
Elite-8S will make slow and gradual output adjustments. If the load is changing quickly, the SQ-Elite-8S can be set to OSS sequencing
where it will react based on load changes. Therefore, the SQ-Elite adapts to specic system requirements and minimizes oscillation
around the set point.

The SQ-Elite-8S’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.

Rotating the lead stage on a call for output promotes even wear on each boiler. The SQ-Elite has three modes of rotation: Manual, FOFO
(First-On/First-Off), or Time. The Time option rotates the lead stage every selected, period from every hour to every 41 days.

Any of the SQ-Elite-8S heating boilers can be set as a Standby boiler with an adjustable Standby delay. Assigning a specic boiler to
work in standby mode will remove it from the rotation sequence. In this mode, the boiler will be used as a backup in large demand
periods where the primary boilers will not sufce.

These outputs work with the control logic to operate system and a combustion air damper relays. 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-8S can sequence boilers as needed. For boilers where higher efciency is achieved using lower ring stages, the SQ-Elite-
8S offers the Parallel Sequencing option. It sequences all the low ring stages of all boilers set to Auto before bringing on the higher
ring stages. For other types of heating boilers, using the Normal Sequencing option brings on the lower ring stage followed by the
higher one of the same boiler. That will be repeated for each of the lag boilers.

Unlike many boilers where, to re a multi-stage boiler both low and high stage relays must be energized, some other equipment 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-8S is designed to control eight stages. However, it has the capability of expanding its control to two SQ-
Elite-EXT extension panels each with eight stages. Thus, the SQ-Elite-8S can control a total of up to 24 stages.

Regardless of the type of applications, Setback is an energy saving feature. The SQ-Elite-8S offers a built-in day/night schedule for the
setback period. On the other hand, if external scheduling is to be used, the Setback can be activated using an external signal by shorting
the SETBACK input terminals.

SQ-Elite-8S & SQ-Elite-EXT Installation Manual 5

The SQ-Elite-8S has multiple operating modes that satisfy most steam systems. It can sequence stages to achieve an adjustable Set Point.
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-8S the capability of being controlled remotely.

PID control logic is primarily used for building heating. 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. On 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-8S will turn on/energize the Lead Boiler's lowest ring stage to start the Purge Delay. After the elapse of the purge
period, the SQ-Elite-8S will start calculating the Reaction Period. If after a full Reaction Time the control logic foresees additional stages
are needed, the SQ-Elite-8S 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-8S 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 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 10 PSI and the Last Stage Hold was set to 2 PSI,
the lead stage will remain energized until the system reaches 12 PSI 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-8S 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 50 Psi and the Throttle setting was 5 Psi, if the System
dropped below 45 Psi (50 Psi - 5 Psi), the lead stage will energize. With further decrease in the system value to 40 Psi (50 Psi - 5 Psi - 5
Psi), the second stage will energize.
As the system pressure rises towards the set point, stages will turn off. Using the previous example, when the system rise to 45 Psi 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 pressure rises to 55 Psi then turn off/de-energize.
    
 



    
55 Psi -1 ---- None A None
50 Psi 0 ---- None ---- A
45 Psi 1 A A B A
41 - 44 Psi 1 ---- A ---- A + B
40 Psi 2 B A + B C A + B
35 Psi 3 C A + B +C D A + B +C
30 Psi 4 D A + B +C + D E A + B +C + D
25 Psi 5 E A + B +C + D + E F A + B +C + D + E
20 Psi 6 F A + B +C + D + E + F ---- A + B +C + D + E + F
15 Psi 7 ---- A + B +C + D + E + F ---- A + B +C + D + E + F

6 Heat-Timer Corp.

If you need the SQ-Elite to do additional tasks that either are not listed or do not know how to set 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 setting of the SQ-Elite-8S and will provide the opportunity to utilize many of the energy
saving features available in the control 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 and sensors and its components
• Setting the System Startup
• Setting the System Settings
• Setting the Stages

The SQ-Elite-8S has been designed with Steam heating as the primary purpose. With this in mind, many of the SQ-Elite-8S features can
be utilized to ease, enhance, and improve your system performance. Some of these features are listed in this section.

• The SQ-Elite-8S can control the System Pressure either by maintaining an adjustable Set Point or by using an optional 4-20mA EMS
Interface (HT# 926741-00). The SQ-Elite-8S can receive an external Set Point as a 4 - 20mA signal from an EMS system using the
4-20mA EMS Interface.

• The SQ-Elite-8S's 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.

• The SQ-Elite-8S can be congured to control up to eight stages. It can control up to 24 stages by adding a maximum of two SQ-
Elite-EXT Extension Panels, each with eight stages.

•
The Combustion Air Damper output can control the equipment while utilizing the PROVE input to check the status on the Combustion
Air Damper End Switch or any other device before any stage is energized.

• Rotating the lead boiler to be activated on a call for output promotes even wear on all boilers. The SQ-Elite-8S has three modes of
rotation: Manual, First-On-First-Off, or Timed Rotation. This option automatically rotates boilers every selected period from one
hour to every 41(999 hours) days.

Two Setback modes are available for the SQ-Elite-8S:
• The Day/Night Scheduling provides an adjustable time-based schedule for the Setback.
• The Setback mode uses an external signal to switch the operation of the SQ-Elite in and out of setback mode.

SQ-Elite-8S & SQ-Elite-EXT Installation Manual 7

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.

• 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 the 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)

8 Heat-Timer Corp.



• Install the System Pressure/Vacuum transducer approximately 10' feet past the
last boiler on the common supply header but before any takeoffs.
• When installing the pressure transducer, use a threaded Brass Isolation Tube
(¼" Brass Pigtail) to attach to the steam header.
• The Red and Black wires can be extended up to 500' using shielded
2-conductor cable. The ground, shield, and reference tube on the transducer
are not used.
• Do not run sensor wires in conduit with line voltage wiring. Class 1 voltage
must use a different knockout and conduit from class 2 voltage.
27 29 31 3328 30 3225 26
Auxiliary
Input2
Outdoor
Temp
System
4 20mA
+
Auxi iary
Input1
Au
In
Cut the Green,
White, and Clear
Tube
Connect
to 1/4" pigtail
BLACK
RED
Transducer
4-20mA

If the System Sensor cannot sense the correct system pressure being supplied to the building, the SQ-Elite-8S will
not provide comfortable heat levels. Be sure that it is located on the main supply header before any takeoffs.

• Only use the Heat-Timer sensor (purchased separately 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.









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

SQ-Elite-8S & SQ-Elite-EXT Installation Manual 9


• Bring the 120VAC 60Hz power wires through the bottom Knockout of the enclosure.
• Class 1 voltage wiring must use a different knockout and conduit from any Class 2 voltage wiring.
• Connect the hot line to terminal marked L.
• Connect the neutral line to the terminal marked N.



Line
Neutral
120VAC
Power Source
PWR
L N
1 2
27 29 31 328 30 3225 26
Aux liary
Input2
Outdoo
Temp
Sys em
4 20mA
+
Auxiliary
Inpu 1
Cut the Green,
White, and Clear
Tube
Connect
to 1/4" pigtail
BLACK
RED
Transducer
4-20mA


• The SQ-Elite-8S is designed to be connected to a Heat-Timer Pressure or Vacuum sensor
located on the common header. Contact the factory for pressure sensor options.
• Pressure sensor wires can be extended up to 500’ by splicing shielded
2-conductor cable (Belden #8760 or equivalent).
• Connect the Red wire to terminal 25 (+) and connect the Black wire to terminal 26 (-).




• Whether in Set Point or EMS 4-20mA modes, the outdoor sensor can be used as an Outdoor Cutoff. The
SQ-Elite will disable all boilers when the outdoor temperature is above the adjustable Outdoor Cutoff
temperature. 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).
• Temperature sensors have no polarity. Connect the wires from the outdoor sensor
to the SQ-Elite 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 3128 30 32
Aux liary
Input2
Outdoo
Temp
Auxiliary
Inpu 1

• This feature will only be available when Shutdown is selected as the External Input Mode option from the
Startup menu on page 15.
• This feature can be used whenever it is desirable to turn off the SQ-Elite-8S stage outputs from a remote
location, another controller (i.e. EMS input), or a switch.
• When the Shutdown is enabled by closing a dry contact, all active stages will immediately turn off. The System
and Comb. Air 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 terminals marked SHUTDOWN- 35,36.
• When Shutdown is selected, Setback will be available using the programmed Day/Night schedule.
Shutdown
Dry Contact
33 3534 36 37 38
PROVE
SHUTDOWN
/TSTAT
SETBACK
Auxiliary
Input3

10 Heat-Timer Corp.

• This feature can be used whenever it is desirable to switch the SQ-Elite-8S 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 15.
• When the Tstat is enabled by closing a dry contact, the SQ-Elite 8S will activate the heating 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 terminals marked TSTAT- 35,36.
• When Tstat is selected, Setback will be available using the programmed Day/Night schedule.
33 352 34 36 37 38
y
PROVE
SHUTDOWN
TSTAT
/SETBACK
Auxiliary
Input3
T-Stat
Dry Contact

• This feature will only be available when Setback is selected as the External Input Mode option from the Startup
menu on page 15.
• It can be used when it is desirable to switch the SQ-Elite-8S to operate in Setback from a remote location (i.e.
EMS input or external time clock). No Day/Night scheduling options will be available with this feature.
• When the Setback is enabled by closing a dry contact, the Target will be reduced by the Setback value.
• 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 terminals marked SETBACK- 35,36.
33 352 34 36 37 38
y
PROVE
SHUTDOWN
TSTAT
/SETBACK
Auxiliary
Input3
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 15.
• 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 components before energizing any stage.
• If the PROVE input is open on a call, the SQ-Elite-8S will enable only the System and Comb. Air Output relays.
All stage outputs will be off.
• A factory-installed jumper provides the System Prove signal. Do not remove the jumper unless it will be
replaced by a Prove signal.
• Bring the two wires from the prove dry contact source to the terminals marked PROVE - 37 38 No voltage can
be placed across the PROVE terminals
Prove
Dry Contact
RS485
36 37 38
PROVE
DOWN
AT
BACK

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 Prove terminals are shorted. DO NOT remove
the PROVE jumper supplied unless replacing it with a Prove signal.


• 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 then de-energize.
• No stage outputs will be activated until the PROVE input is shorted.
• The System output has one Normally Open (N.O.) dry contact relay. 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
21 22 23 24
COMB
AIR
Comb.
Air
Damper
L
N

• The SQ-Elite can control the Combustion Air Damper when the Comb. Air Output option is activated in the
Startup Menu on page 15. In this scenario, the PROVE input will be used to check on the Combustion Air
Damper status.
• The SQ-Elite will energize the Combustion Air Damper relay whenever there is a call to energize any of the
boiler stages.
• The Combustion Air output has one Normally Open (N.O.) dry contact relay. It does not source any power.
• Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.

SQ-Elite-8S & SQ-Elite-EXT Installation Manual 11

• The SQ-Elite-8S can be congured to operate the stages of On/Off or multi-stage boilers.
• The relays are N.O. dry contacts only. They do not source any voltage.
• Wire the N.O. relay contacts in series with the boiler’s limit circuit.
• When wiring several multi-stage boilers, start with the lower stage of the rst boiler and wire it to
Output A followed by the higher stage of the same boiler and wire it to Stage B.
3 5
Stage A
7
Stage B
9
Stage C
11
Stag
Stage D
6 8 10
4
Lo Hi
Unit1
Stages
Lo Hi
Unit2
Stages


• 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-8S 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-8S
SEQUENCING CONTROL
PWR
L N
1 2 3 5
S age A
7
S age B
9
S age C
11 13
S age E
15
S age F
17
Stage D
6 8 10 12 14 16 8
RS485
4
Stage G
9
S age H
21 27 29 31 33 3520 22 28 30 32 34 36
Stage E
Stage F
Stage G
Stage H
Stage A
Stage B
Stage C
Stage D
25 26 37 38
PROVE
PROGRAM RUN
23 24
ENCLOSED
ENERGY
MANAGEMENT
EQU PMENT
L STED
99RA
C US
SQ-Elite-EXT
SEQUENCING CONTROL EXTENSION
O
P
Power
CAUTION: Risk of Electr c 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
NPUT RATINGS
115VAC 60Hz 12VA MAX
OUTPUT RAT NGS
120VAC 6A RES STIVE
1A PILOT DUTY 15A TOTAL
FOR ALL CIRCUITS
Ext B
L
M
N
Comm
T
U
V
W
X
N
13 4
Q S UR T V
SQ-Elite-EXT A
Use Copper Conductors On y
I
J
K
Q
R
S
O
15 16
P
17 18
W X
O
P
Power
CAUTION: Risk of Electr c 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
NPUT RATINGS
115VAC 60Hz 12VA MAX
OUTPUT RAT NGS
120VAC 6A RES STIVE
1A PILOT DUTY 15A TOTAL
FOR ALL CIRCUITS
Ext B
L
M
N
Comm
T
U
V
W
X
N
13 4
Q S UR T V
SQ-Elite-EXT B
Use Copper Conductors On y
I
J
K
Q
R
S
O
15 16
P
17 18
W X
4-20 mA EMS
4-20mA NPUT
+Signa 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
7 0PSI 35F
TGT=8 0psi
AB> CD EF GH
HI O OFF
SYS
AUX OUT
COMB AIR
NPUT RATINGS 120VAC 60Hz 12VA MAX
Use Copper Conductors On y
CAUTION: Risk of E ectric Shock
SENSORS MUST BE GOLD SERIES
OUTPUT RATING 2A 120VAC
MAX MUM 15A TOTAL FOR ALL CIRCU TS
DO NOT APPLY ANY VOLTAGE
TO INPUT TERMINALS
SYS AUX
OUT
Au i i ry
Inpu 2
Outdoor
Temp
Sys em
4 20mA
+ -
COMB
AIR
HUT OWN
TS AT
SET ACK
Aux l ary
nput1
Au i i ry
Inpu 3

12 Heat-Timer Corp.
---- MAINTENANCE ----
Unit F
Present Time12:30P
<Sensor Trim>
<Histories>
<Configuration>
BACK SELECT
------ SETTINGS ------
Season Winter
Set Point 9 psi
EMS SetPoint 9 psi
<System Settings>
<Maintenance>
<System Startup>
BACK SELECT

-- CONTROL MODE ---
Set Point
EMS 4-20mA
BACK SAVE
-DISPLAY STANDARD -
English
Metric
BACK SAVE
EMS 4mA SET POINT
0 psi
[ ]
BACK SAVE
EMS 20mA SET POINT
30 psi
[ ]
BACK SAVE
-COMB. AIR OUTPUT-
N o
Yes
BACK SAVE
-- EXTERNAL INPUT -
Shutdown
Tstat
Setback
BACK SAVE
--- BURNER TYPE ----
On/Off
2-Stage
3-Stage
4-Stage
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

--- SENSOR TRIM ----
Sys Trim +0.0 psi
Outdoor Trim +0 F
BACK SELECT
Sys=10 psi 10:00AM
BACK NEXT

• 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.


SQ-Elite-8S V1.00
Pressure 30psi
EMS 4-20mA, Shtdown
0psi - 30psi
BACK NEXT
--- SENSOR TYPE ---
Pressure 15psi
Pressure 30psi
Pressure 100psi
Pressure 200psi
Pressure 300psi
Pressure 0.250MPa
Pressure 0.600MPa
Pressure 1.000MPa
Pressure 1.600MPa
Vacuum 3in/762mm
BACK SAVE
----- 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

8.5 psi 45 F
TGT=9.0 psi
ABC <DEF>
---- LO
Boiler Menu

SQ-Elite-8S & SQ-Elite-EXT Installation Manual 13
----- SETTINGS ------
Season Winter
Set Point 9.0psi
EMS Set Point 9.0psi
<System Settings>
<Maintenance>
<System Startup>
BACK SELECT
---- SEASON ---
Winter
Summer
BACK SAVE
----- SET POINT -----
10.0 psi
[ ]
BACK SAVE
-- EMS SET POINT --
10.0 psi
BACK SAVE
- SYSTEM EXERCISE -
Off
On
BACK SAVE

------- RUN-ON -------
2min
[ ]
BACK SAVE
- STAGE SETTINGS -
Reaction Time 1min
Purge Delay 0.0min
Min Runtime 2min
Standby Delay 10min
Lst Stge Hold 5.0psi
Throttle 2.0psi
<Lead Settings>
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
0.0 psi
[ ]
BACK SAVE
-- LEAD BOILER --
A B
CD
BACK SELECT
AUTO ROTATE PERIOD
24hrs
[ ]
BACK SAVE
- THROTTLE RANGE -
2.0 psi
[ ]
BACK SAVE

SETBACK SCHEDULE
Setback 0.0psi
Present Time **:**
Day Schdul 7:00Am
Night Schdul 7:00Pm
------ SETBACK -------
0.0 psi
[ ]
BACK SAVE
- NIGHT SCHEDULE --
07:**Pm
BACK SAVE
-- DAY SCHEDULE ----
07:**Am
BACK SAVE
- SET PRESENT TIME
**:**
BACK SAVE

BACK SELECT
- OUTDOOR CUTOFF -
70 F
[ ]
BACK SAVE
-- LEAD ROTATION --
Time
Manual
FOFO
BACK SELECT
-- LEAD SETTINGS --
Lead Boiler AB
Rotate Mode Time
BACK SELECT

8.5 psi 45 F
TGT=9.0 psi
ABC <EFG>
---- LO
Boiler Menu
- SYSTEM SETTINGS -
<Stage Settings>
<Setback Schedule>
Setback 0.0psi
Run-On 2min
Sys Exercise Off
BACK SELECT


14 Heat-Timer Corp.

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 does not, 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 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.

SetPoint,EMS4-20mA Default:SetPoint
Hold Button: MENU/<System Startup>/..../Control Mode
• 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 option allows the SQ-Elite-8S 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 Points in the following screens.
--- CONTROL MODE ---
Set Point
EMS 4-20mA
BACK SAVE
--- SENSOR TYPE ---
Pressure 15psi
Pressure 30psi
Pressure 100psi
Pressure 200psi
Pressure 300psi
Pressure 0.250MPa
Pressure 0.600MPa
Pressure 1.000MPa
Pressure 1.600MPa
Vacuum 3in/762mm
BACK SAVE

Pressure15Psi,30Psi,100Psi,200Psi,300Psi,0.25MPa,0.6Mpa,1MPa,1.6MPa,
Vacuum3in,762mm Default:30psi
Hold Button: MENU/<System Startup>/..../Sensor Type
• The SQ-Elite-8S can accept a variety of pressure or vacuum transducers. This option
will allow the SQ-Elite-8S to utilize the proper sensor data based on the Sensor Type
selected.

English,metric Default:English
Hold Button: MENU/<System Startup>/..../Display Standard
• The SQ-Elite-8S can control boilers in steam heating environment. It gives the user the
capability of displaying pressure and temperature information in either of the standards.
-DISPLAY STANDARD-
English
Metric
BACK SAVE

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 pressure 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-8S.
• In addition, the user will need to set the pressure range parameters in the Startup Menu.
First, set the pressure reading at 4mA, then the set it at 20mA.
• The SQ-Elite-8S will only read the pressure range between 2.4mA and 21.6mA based on
the 4mA and 20mA settings entered.
• 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 and Comb. Air relays will continue for the
Run-On delay period then de-energize.
EMS 4mA SET POINT
0psi
[ ]
BACK SAVE
EMS 20mA SET POINT
100psi
[]
BACK SAVE

A good practice after performing any Startup menu
modications is to check all operating settings and
adjustments to match the new settings.

SQ-Elite-8S & SQ-Elite-EXT Installation Manual 15

No,Yes Default:Yes
Hold Button: MENU/<System Startup>/..../Comb. Air Output
• If Yes is selected, the SQ-Elite-8S 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 then de-energize.
- COMB. AIR OUTPUT-
N o
Yes
BACK SAVE
• In a prove failure situation, the message "Wait for Comb. Prove" will display when there is a call for a boiler until
the PROVE terminals are 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.
• When not using the PROVE input, leave the supplied prove jumper in place on terminals 37 and 38.

Shutdown,Tstat,Setback Default:Shutdown
Hold Button: MENU/<System Startup>/..../External Input
• The Shutdown function allows the SQ-Elite-8S to receive a remote Shutdown signal to
terminals 35 and 36 to turn off all relays including all boiler stages.
• The Tstat option gives terminals 35 and 36 the capability of functioning as a heat-call.
That is, when the terminals are shorted, the SQ-Elite-8S will sequence the stages to
maintain the set point. However, when the terminals 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-8S 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.
-- EXTERNAL INPUT -
Shutdown
Tstat
Setback
BACK SAVE

On/Off,2-Stage,3-Stage,4-Stage Default:On/Off
Hold Button: MENU/<System Startup>/..../Burner Type
• The SQ-Elite-8S can sequence from a single stage and up to four stages per boiler.
--- BURNER TYPE ----
On/Off
2-Stage
3-Stage
4-Stage
BACK SAVE

1to24 Default:variesbasedonBurnerType
Hold Button: MENU/<System Startup>/..../Total Boilers
• This option in combination with Burner Type Startup options will determine the total
number of outputs the SQ-Elite-8S is to control.
• Use an SQ-Elite-EXT for any additional stages required more than the SQ-Elite-8S has.
• If the total number of stages selected 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

MultipleOutputs,SingleOutput Default:MultipleOutputs
Hold Button: MENU/<System Startup>/..../Staging
• Most boilers will require that the higher output stages to be energized after the lower
output stages. These boilers will need to select the Multiple Output option. That means
both Low and High Output stages must be energized for the boiler to function.
• Some units require that when the higher output stages are needed, 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

16 Heat-Timer Corp.

Lo/Hi/Lo/Hi,Lo/Lo/Hi/Hi Default:Lo/Hi/Lo/Hi
Hold Button: MENU/<System Startup>/..../Sequencing
• During low load conditions, some boilers run more efcient when the lower stages are
energized alone than with the higher stages. These types of boilers should select Lo/Lo/
Hi/Hi. Then, the SQ-Elite-8S will sequence the lower stages of all Automatic boilers
before sequencing the higher stages.
------ SEQUENCE -------
Lo/Hi/Lo/Hi
Lo/Lo/Hi/Hi
BACK SAVE
• For the rest of the boiler types, the Lo/Hi/Lo/Hi should allow the staging of the lower stage of the lead boiler followed by the
higher stage of the same boiler. Then when more stages are needed, it will re the lower stage of the lag boiler followed by the
higher stage of the lag boiler.

PID,OSS(Over-Sized-System) Default:PID
Hold Button: MENU/<System Startup>/..../Sequencing
• The PID option allows the SQ-Elite-8S 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
pressure. The PID logarithmic calculations foresee changes and sequence stages based
on those changes. It is the most efcient operation for most heating applications.
--- CONTROL LOGIC---
PID
OSS
BACK SAVE
• The Oversize option sequence stages based on how many Throttling ranges (differentials) is the system pressure away from
the set point. 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 full
Throttling range before turning off that stage. This helps to prevent the last stage from short cycling. See Throttle Range.
When PID is selected, the following are the settings that directly affect this mode of operation:
• Reaction Time SELECT Settings/System Settings/Stage Settings/Reaction Time
• Purge Delay SELECT Settings/System Settings/Stage Settings/Purge Delay
• Minimum Run Time SELECT Settings/System Settings/Stage Settings/Min Runtime
• Standby Delay SELECT Settings/System Settings/Stage Settings/Standby Delay
• Last Stage Hold SELECT Settings/System Settings/Stage Settings/Last Stage Hold
When Oversize (OSS) is selected, the following is the setting that directly affects this mode of operation:
• Throttle SELECT Settings/System Settings/Stage Settings/Throttle

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 that are 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.
• When Stages-On is selected, the SQ-Elite-8S will turn all stages On when the System sensor reads Short or Open.
• When Stages-Off is selected, the SQ-Elite-8S will turn all stages Off when the System sensor reads Short or Open.
• The Outdoor Sensor Short or Open status will not affect the stages operation.

To Reset the SQ-Elite-8S control to its original factory defaults, follow the following steps:
• Power down the control.
• Hold down the two right most buttons while powering the control back up until the To-
tal Clear Started screen appears. The Display will direct you to the Startup
menu after the defaults are loaded to program the control.
TOTAL CLEAR STARTED
Release buttons
and
Please Wait
NOTE: After resetting the control to the original factory defaults, the user must go through all control settings.

After performing a total reset, do not turn off power to the 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.

SQ-Elite-8S & 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-8S 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

Winter,Summer Default:Winter
Button: MENU/Season
• The SQ-Elite-8S will turn all boiler relays off when it is in Summer setting. The
Message Display Line will read Summer to show status.
• When in Winter, the SQ-Elite-8S will activate the System relay whenever the Outdoor
temperature falls to or below the Outdoor Cutoff setting. In addition, it will begin
heating whenever the System pressure falls below the Set Point. The Message Display
Line will not display any season information.
• When the season is over, it is a good practice to switch the SQ-Elite-8S Season setting to
Summer to turn off all heating instead of turning off the control. This will preserve the
battery life.

DO NOT turn power off to the
SQ-Elite when in off-season. If
you do so, the battery will run
down and have to be replaced.
Instead, switch to Summer.
---- SEASON ---
Winter
Summer
BACK SAVE

SeepressureTransducerDefaultSettingsandRangesTable
Button: MENU/Set Point InSetPointorEMS4-20mA
• The Set point is the pressure value the SQ-Elite-8S will use to control the system.
• The SQ-Elite-8S will add, subtract, or hold the stages of the heating boilers to maintain
the system pressure around the Set point.
----- SET POINT -----
12.0psi
[ ]
BACK SAVE
• The system can be expected to oscillate around the set point. The amount of oscillation depends on the System Settings and
Stage Settings.
• If an Outdoor Sensor was connected, pressing the SAVE button will switch to the Outdoor Cutoff setting option.
• If the EMS Mode was Enabled, the Set Point will be set by the EMS/BMS system and will be available as read only.
• Any value below the 2mA or above 22mA will indicate a "Shutdown by EMS" message on the Message Line.

AdjustableOff,20ºF/-7ºC-100ºF/38ºC,On Default:70ºF/21ºC
Button: MENU/Set Point/Outdoor Cutoff inSetPoint
• In Set Point mode, if the outdoor sensor is installed, the Outdoor Cutoff screen will
automatically appear after the pressure Set Point has been selected.
- OUTDOOR CUTOFF --
70 F
[ ]
BACK SAVE
• When the outdoor temperature falls to the adjustable Outdoor Cutoff temperature, the SQ-Elite-8S will control and sequence the
boiler stages to hold the set point.
• When the outdoor temperature rises to the Outdoor Cutoff plus a 2°F differential, the SQ-Elite-8S will turn all boilers off. The
System and Comb. Air relays that were energized will remain energized for the Run-On delay then de-energize.
• The Outdoor Cutoff can be set to ON or OFF. In the ON position, the System Relay will run regardless of the Outdoor
temperature and the burner stages will be active to hold the set point.
• In the OFF position, the System Relay will always be off and all stages will be off as well.

Hold Button: MENU/<System Settings>
The System Settings menu provides access to adjusting and ne-tuning the heating system for
enhanced comfort and better fuel savings. The SQ-Elite-8S behaves differently based on the
selected Control Modes (see Startup Settings on page 14).
- SYSTEM SETTINGS -
<Stage Settings>
<Setback Schedule>
Setback 0.0Psi
Run-On 2min
System Exercise Off
BACK SELECT

18 Heat-Timer Corp.

To be able to change the SQ-Elite-8S 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 Settings>/<Stage Settings>
-- STAGE SETTINGS --
Reaction Time 1min
Purge Delay 0.0min
Min Runtime 2min
Standby Delay 10min
Lst Stge Hld 5.0psi
Throttle 2psi
<Lead Settings>
BACK SELECT
-- REACTION TIME --
2min
[
BACK SAVE

Adjustablefrom1to10minutes Default:2minutes
Hold Button: MENU/<System Settings>/<Stage Settings>/Reaction TimeinPIDLogiconly
• Available in PID Control Logic only (See PID Operation on page 5).
• It is the amount of time it takes a single stage to affect the system.
• After the SQ-Elite turns on a stage trying to meet a set point, it will not turn on another
stage until the Reaction Time has elapsed. Then, it will recalculate if a stage is need.
• To determine the optimum time, in a heating system start with a hot system. Then, turn
on a single stage and calculate how long it takes until the system begins to respond to
that stage. That period should be set as the Reaction Time.

Adjustablefrom0.0to10.0minutes Default:2.0minutes
Hold Button: MENU/<System Settings>/<Stage Settings>/Purge DelayinPIDLogiconly
• Available in PID Control Logic only (See PID Operation on page 5).
• Most large boilers must go through a purge cycle before they are brought on line.
--- PURGE DELAY ----
0.0min
[ ]
BACK SAVE
• When the SQ-Elite-8S activates a stage (the lowest stage on a boiler), it does not start to calculate its output until the Purge
Delay is over. This allows the boiler to fully come on line and to begin producing output.
• The Purge Delay helps prevent short cycling of a newly activated boiler. Once the lowest boiler stage is activated, it MUST run
through the entire Purge Delay period.
• The minimum Purge Delay setting MUST be set to the time required by the boiler's manufacturer specication.

Adjustablefrom1to60minutes Default:2minutes
Hold Button: MENU/<System Settings>/<Stage Settings>/Min RuntimeinPIDLogiconly
• Available in PID Control Logic only (See PID Operation on page 5).
• This is the minimum amount of time any stage will run.
• For the lowest stage of a boiler, the Minimum Runtime starts after the purge cycle.
- MINIMUM Runtime -
2min
[
BACK SAVE
• This timer does not apply to the last stage online. The Last Stage Hold applies in that case.
• Initially, set the Minimum Runtime to half the Reaction Time.
• If System tends to overshoot, reduce the Minimum Runtime. If boilers tend to short cycle, increase Minimum Runtime.

Adjustablefrom1to60minutes Default:10minutes
Hold Button: MENU/<System Settings>/<Stage Settings>/Standby DelayinPIDLogiconly
• Available in PID Control Logic only (See PID Operation on page 5).
• Standby boilers are used as a backup for extreme load conditions only. A standby boiler
can never be a Lead Stage. The Standby Delay only applies to boilers in Standby Mode.
• A Standby unit can only be activated after all the units in Auto Mode have run at high
re for the full Standby Delay.
-- STANDBY DELAY --
10min
[
BACK SAVE
• The full Standby Delay must always elapse regardless of what happens to system pressure. Therefore, a shorter Standby Delay
will result in smoother set point operation in extreme conditions. However, longer Standby Delays may prevent a Standby
boiler from starting if the other boilers can eventually meet the load, or if the load decreases.
• When more than one boiler is set as a Standby boiler, remember that it will be added to the Reaction Time for the rst stage on
the rst Standby boiler only. The following stages and boiler start time will rely on Pre-Purge and Reaction Time only.

SQ-Elite-8S & SQ-Elite-EXT Installation Manual 19

SeepressureTransducerDefaultSettingsandRangesTable
Hold Button: MENU/<System Settings>/<Stage Settings>/Last Stge HoldinPIDLogiconly
• Available in PID Control Logic only (See PID Operation on page 5).
• The Last Stage Hold prevents short cycling of the Lead Stage during low load conditions
where the system might have a load that is signicantly less than the output of one stage.
LAST STAGE HOLD
0 PSI
[ ]
BACK SAVE
When the SQ-Elite-8S brings on the Lead Stage, the Set Point is quickly exceeded, and the Lead Stage is turned off.
• To prolong the run time during this type of condition, use the Last Stage Hold setting.
• The SQ-Elite will allow the system pressure to exceed the Set Point by the Last-Stage-Hold value, before the Lead Stage is
turned off.
• For example, with a Set Point of 8 Psi and a Last Stage Hold setting of 2 Psi, the Lead Stage boiler will remain on, at low re,
until the system reaches 10 Psi. During that period, the display will show "Hold Until 10 Psi" then, the lead stage
will turn off

SeepressureTransducerDefaultSettingsandRangesTable
Hold Button: MENU/<System Settings>/<Stage Settings>/Throttle inOSSLogiconly
• Available in OSS Control Logic only (See OSS Operation on page 5).
• The Throttling Range sets a pressure band around the Set Point that controls when stages
will be turned on or off.
-- THROTTLE RANGE --
2PSI
[ ]
BACK SAVE
• For example, in the OSS Control Mode, no stages will be activated until the pressure falls one full Throttling Range below the
Set Point. A second stage will be activated when the pressure falls to two full Throttling Ranges below the Set Point, and so on,
with one extra stage being turned on for every throttling range below the Set Point the System pressure reaches.
• Stages will be turned off as the pressure rises toward the Set Point using one full throttling range as a differential between
stages.
• The last stage to be turned off will be allowed to exceed the Set Point by a full throttling range before it is turned off. This helps
prevent the last stage from short cycling when the load is low or when the stage is oversized.
    
 



    
55 Psi -1 ---- None A None
50 Psi 0 ---- None ---- A
45 Psi 1 A A ---- A
41 - 44 Psi 1 ---- A ---- A
40 Psi 2 B A + B B A + B
35 Psi 3 C A + B +C C A + B +C
30 Psi 4 D A + B +C + D D A + B +C + D
25 Psi 5 E A + B +C + D + E E A + B +C + D + E
20 Psi 6 F A + B +C + D + E + F F A + B +C + D + E + F
15 Psi 7 ---- A + B +C + D + E + F ---- A + B +C + D + E + F

Hold Button: MENU/<System Settings>/<Stage Settings>/<Lead Settings>
The lead menu is to help in selecting the Lead boiler and the type of rotation appropriate for
the system.
-- LEAD SETTINGS --
Lead Boiler AB
Rotate Mode Time
BACK SELECT

20 Heat-Timer Corp.

Dependingonthenumberofstages Default:Therstsetofstages
Hold Button: MENU/<System Settings>/<Stage Settings>/<Lead Setting>/Rotate Mode
• The Lead Boiler’s lowest stage will always be the first stage brought on when there is a
call for output. As more output is needed, additional Stages are added.
• The Lead Boiler is always shown on the main display in brackets.
• In a 2-Stage system (see Burner Type in the Startup section on page 15), the display will
show the two Lead Boiler stages bracketed <AB>. In a 3-Stage system, the display will
show the three Lead Boiler stages bracketed <ABC>, and so on.
• The Lead Boiler can be rotated based on the Rotation Mode selected. (See next setting)
-- LEAD BOILER --
A B
CD
EF
BACK SELECT

AdjustableTime(from1hrto999hrs),Manual,FOFO Default:Time(24Hours)
Hold Button: MENU/<System Settings>/<Stage Settings>/<Lead Setting>/Rotate Mode
• The Lead Boiler is the rst boiler brought on when output is required.
• The Lead Boiler can be rotated automatically, manually, or based on First-On/First-Off
(FOFO). The automatic rotation is recommended for most applications.
• The current Lead Boiler is shown in brackets on the main display.
• Only boilers that are set to Auto Mode can be Lead. Therefore, not all the boilers may
be available when manually selecting a new Lead Boiler.
• If Time is selected, a second screen will allow the adjustment of the Auto Rotate Period.
If 24 Hours (default setting) was selected, the rst rotation will take effect after 12 hours
if the Time was not set. However, if the Time was set, the rotation will always take
place at 2:00AM. The following rotations will take place every 24 hours thereafter.
• If Time Rotation was set to other than 24 hours, the rotation timer will start from the
moment the setting is changed.
• If First-On/First-Off (FOFO) is selected, the concept will follow this example; if A is the
lead, the starting sequence of boilers will be A, B, then C. When the de-energizing of
the stages starts, it will turn off A, B, Then C. Then stage D will be the new lead for the
next load.

Button: MENU/<System Settings>/<Stage Settings>/<Setback Schedule>
-- LEAD ROTATION --
Time
Manual
FOFO
BACK SELECT
If Time Rotation is selected
AUTO ROTATE PERIOD
24hrs
[ ]
BACK SAVE
SETBACK SCHEDULE
Setback 0psi
Present Time **:**
Day Schdule 7:00Am
Night Schdul 7:00Pm
BACK SELECT

SeepressureTransducerDefaultSettingsandRangesTable
Button: MENU/<System Settings>/<Setback Schedule>/Setback inDay/NightSchedule
Button: MENU/<System Settings>/Setback inExternalSignal
• The Setback feature can be used to provide the SQ-Elite-8S with a lower Set Point
when less load is required during the night or on the weekends when the building is not
occupied, but heat is still required.
------ SETBACK -------
0psi
[ ]
BACK SAVE
• The new Set Point will appear on the main display indicating this condition "Setback to 5 Psi".
• For example, if the pressure set point is 8 Psi and the Setback is 3 Psi, then when in Setback, the SQ-Elite-8S will hold a Set
Point of 5 Psi.

• The pressure limits set on the boilers MUST be set considerably higher than the SQ-
Elite’s Set Point for the reasons detailed below.
• The SQ-Elite sensor is located in a common header some distance from the boilers.
• As the pressure rises in the header and before reaching the sensor location, energy is
dissipated. Therefore, the pressure in the header could be lower than that registered by
the boiler sensors.
• In addition to the normal drop experienced between the boiler’s pressure and that read

The temperature limits set on
the boilers must be higher than
the SQ-Elite Set Point. Read
the section at left for details
that will prevent erratic system
operation.