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4
Heat-Timer Corp.
SQ-ELITE-8T OVERVIEW
sequences up to 8 stages wIth puMps or ValVes.
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.
pId or oVer-sIzed-systeM (oss) logIc
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 specific system requirements and minimizes
oscillation around the set point.
dIgItal dIsplay of all systeM settIngs
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 first 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.
outdoor reset wIth custoMIzaBle curVe
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 fine 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 suffice.
standBy unIt optIon
Any of the SQ-Elite-8T heating or cooling units can be configured as a Standby with an adjustable Standby delay. Assigning a specific
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 suffice.
systeM and coMBustIon aIr daMper outputs wIth proVe Input
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.
norMal (lo/hI/lo/hI) or parallel (lo/lo/hI/hI) sequencIng
The SQ-Elite can sequence heating or cooling units as needed. For heating systems where higher efficiency is achieved using lower
firing stages, the SQ-Elite offers the Parallel Sequencing option. It sequences all the low firing stages first 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.
MultIple or sIngle stagIng
Unlike many boilers where, to fire 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.
add up to 16 stages
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.
MonItor systeM return teMperature
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.
dhw puMp control wIth MultIple prIorIty optIons
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.
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