Lead Boiler; Rotate Mode; Setback Schedule; Setback - heat-timer SQ-Elite-8S Installation And Operation Instruction Manual

20 Heat-Timer Corp.

lead boIler

Depending on the number 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)

rotate Mode

Adjustable Time (from 1 hr to 999 hrs), Manual, FOFO
Hold Button: MENU/<System Settings>/<Stage Settings>/<Lead Setting>/Rotate Mode
• The Lead Boiler is the first 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 first 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.

setback scHedule

Button: MENU/<System Settings>/<Stage Settings>/<Setback Schedule>

setback

See pressure Transducer Default Settings and Ranges Table
Button: MENU/<System Settings>/<Setback Schedule>/Setback in Day/Night Schedule
Button: MENU/<System Settings>/Setback
• 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.
• 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.
avoiding conflicting boiler limits
• 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
Default: The first set of stages
Default: Time (24Hours)
in External Signal
-- LEAD BOILER --
AB
CD
EF
BACK SELECT
-- LEAD ROTATION --
Time
Manual
FOFO
BACK SELECT
If Time Rotation is selected
AUTO ROTATE PERIOD
24hrs
[
BACK
SETBACK SCHEDULE
Setback
Present Time **:**
Day Schdule 7:00Am
Night Schdul 7:00Pm
BACK SELECT
------ SETBACK -------
0psi
[
BACK
WarnIng
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.
]
SAVE
0psi
]
SAVE