Pump, Valve, And Combustion Air Damper Operation; Run-On; Pump Exercise - heat-timer SQ-Elite-8T Installation And Operation Instruction Manual

• The second option will be connecting a Heat-Timer temperature sensor (HT #904250-00) for immersion in a 3/8ID well (HT
#350147-00 or 904011-00) will offer the capability of adjusting the DHW Set Point and Differential through the SQ-Elite-8T
easy to follow menu (See page 29). In addition to being able to view and log DHW temperature history.
DHW DIFFERENTIAL
Adjustable 5°F/3°C to 80°F/44°C
Hold Button: MENU/<System Settings>/<DHW Settings>/DHW Diff.
• This represents the number of degrees the DHW temperature can drop from the DHW
Set Point before a DHW call can be recognized and the DHW Pump relay energized.
• A large DHW Differential will result in oscillation in the DHW temperature. However, a
small DHW Differential will have a tighter control over the DHW temperature but might
result in boilers coming on frequently for short periods to satisfy the DHW Set Point and
Differential settings.

puMp, ValVe, and coMBustIon aIr daMper operatIon

• The SQ-Elite-8T controls multiple relays each controlling different types of equipment. In addition to the control of the boilers
or cooling units, it can control, the primary system pump, unit pumps or valves, a DHW pump, and a combustion air damper.
The operation of those relays depends on the Startup and System Settings.

RUN-ON

Adjustable 0 to 60 minutes
Hold Button: MENU/<System Settings>/Run-On
• The Run-On applies to all pumps, valves and dampers. It is the additional time a
pump, valve, or a combustion air damper relay will run after the output unit relays has
de-energized. For pumps and valves, it is used to dissipate the excess energy from the
heating or cooling system into the building. For a combustion air damper, it brings in
enough fresh air for the next boiler fire up.
• The Run-On time should be set based on the size and type of the equipment. A boiler with low water content will need a longer
Run-On than a boiler with more water content.

puMp exercIse

Adjustable Off, On
Hold Button: MENU/<System Settings>/Pump Exercise
• The SQ-Elite-8T provides an option to exercise pumps for 10 seconds when not used for
seven days. This option reduces pumps' impellers locking after a long off-season period.
SQ-Elite-8T & SQ-Elite-EXT Installation Manual
Default: 10°F/6°C
Default: 2 minutes
DHW DIFFERENTIAL
[
BACK
------- RUN-ON -------
[
BACK
--- PUMP EXERCISE --
Default: Off
Off
On
BACK
29
10 F
]
SAVE
2min
]
SAVE
SAVE