heat-timer SQ-Elite-8T Installation And Operation Manual Download Page 50

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059063–00 REV. C

HEAT-TIMER CORP.

INSTALLER MENU SEQUENCE

SET POINT

(NOT ADJUSTABLE IN EMS MODE)

Adjustable -10ºF/-23ºC - 230ºF/110ºC

Default:

70ºF/21ºC

Button:

MENU/Set Point

In Set Point or EMS 4–20mA

•

The Set point is the temperature value the SQ-Elite-8T will use to control the system.

•

The SQ-Elite-8T will add, subtract, or hold the stages of the heating or cooling units to
maintain the system temperature around the Set point.

•

The system temperature can be expected to fluctuate around the set point. The amount
of fluctuation depends on the System Settings and Stage Settings.

•

If the EMS Mode was Enabled, the Set Point will be set by the EMS/BMS system and will
be available to be only read.

•

The range of Set Point in the EMS is set in the Startup menu at 4mA and 20mA.

•

Any reading below the 2mA or above 22mA will indicate a “

Shutdown by EMS

”

message on the Message Line.

RESET RATIO

Custom, 1(8.00ºOD : 1.00ºSys) to 12 (4.00ºOD : 1.00ºSys)

Default:

1(1.00ºOD : 1.00ºSys)

Button:

MENU/Outdoor Reset/Reset Ratio

In Outdoor Reset Only

•

The Reset Ratio applies only to Heating applications.

•

The Reset Ratio determines how the System water temperature will vary with the outside
temperature. With any of the ratios, the colder it becomes outside, the hotter the
temperature of the system water. (See Understanding Operation Concept on page 6).

•

With a 1.00 (OD):4.00 (SYS) ratio, the System water temperature (SYS) will increase
rapidly as the outside temperature falls, hitting the Maximum of 240°F at 35°F outside
temperature. With a 4.00 (OD):1.00 (SYS) ratio, the System water temperature (SYS) will
increase slowly as the outside temperature falls. Even at -30°F, the system water will only
be 125°F, and at 22°F outside, the system water will be 112°F. Such a low Reset Ratio
might be used with radiant floor heating applications.

•

With most baseboard heating applications, a 1.00 (OD):1.00 (SYS) setting is a good place
to start. With a 1.00 (OD):1.00 (SYS) ratio, for every degree the outside temperature falls,
the system water temperature is increased one degree.

•

If required:

Adjust the Reset Ratio in cold weather

. If the ambient building Warmer

temperatures are too cold in cold weather, move the ratio to a higher selection. That is, if
1.00 (OD):1.00 (SYS) was initially selected, change the selection to 1.00 (OD):1.25 (SYS).
If the building temperatures are too warm in cold weather, move the ratio to a lower
selection. That is, if 1.00 (OD):1.00 (SYS) was initially selected, change the selection to
1.25 (OD):1.00 (SYS).

----- SET POINT -----

70 F

[

]

BACK

SAVE

---- 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