42
Heat-Timer Corp.
seQ and MoV custoMIzed reset ratIo
Button:
MENU/<SEQ Setting>/Outdoor Reset/Custom
SEQ
Button:
MENU/<MOV Setting>/Outdoor Reset/Custom
MOV
• For situations where the available reset ratios do not provide the perfect building heat-loss equilibrium, the customized option can
be used. It provides the user with the capability of assigning two points on the reset ratio diagram and use the line that connects
those two points as the customized reset ratio curve. Each of the two points will need a specific System and Outdoor Temperature
to identify it on the diagram.
• To Set the first point, specify Sys Temp 1, and OD Temp 1. Then, specify Sys Temp 2, and OD Temp 2, to set the second point on
the curve. The two points can be anywhere on the line, not necessarily at the ends.
• The chart shows an example of a customized curve 6(OD):5(SYS) that does not exist in the standard curve options. If the outdoor
temperature reaches 30ºF, the system target will be 145ºF.
• Remember that the Min Target, Max Target, and Offset apply to all reset ratios including the customized reset ratio ones.
-- SET SYS TEMP.1 -
120 F
[
]
BACK SAVE
-- SET SYS TEMP.2 -
170 F
[
]
BACK SAVE
-- AT OD TEMP.1 ---
60 F
[
]
BACK SAVE
-- AT OD TEMP.2 ---
0 F
[ ]
BACK SAVE
Outdoor Temperature (in °F)
70
60
50
40
20
30
0
-10
10
-20
120
140
130
150
160
170
180
100
110
W
ater
T
emperature (in °F)
Custom Reset Ratio
Point1: System=120°F
Oudoor=60°F
Point2: System=170°F
Oudoor=0°F
Point1
Point2
Customized Reset Ratio
Max Target
Min Target
seQ and MoV target offset
Adjustable from 40
º
F/22
º
C - (-40
º
F/-22
º
C)
Default: 0
º
F/0
º
C
Button:
MENU/<SEQ Setting>/Offset
SEQ
Button:
MENU/<MOV Setting>/Offset
MOV
• The Offset setting lets you adjust the starting points of the Reset Ratio curves. This means
that, regardless of the Outdoor temperature, or the Reset Ratio that has been selected,
when the Offset setting is changed, that change is directly added to or subtracted from the
calculated temperature. For example, if the Set Point temperature was 130°F and the Offset
was changed from 0° to 10° (an increase of 10°), then the Set Point temperature would
increase to 140°F.
-- TARGET OFFSET ---
+0 F
[
]
BACK SAVE
• The Offset setting does not change the ratio selection. For instance, with 1.00 (OD):1.00
(SYS) Reset Ratio, the System water temperature will always increase one degree for
each degree change in the Outdoor temperature. What the Offset does is add or subtract a
constant temperature value. (See Understanding Operation Concept on page
• The Minimum and Maximum Target (available in Installer Menus only) will take
precedence over the Offset. That is, if the Max Target was set to 180°F and the Offset was
set to 20°F. If the set point was 170°F, the new calculated set point based with the Offset
will not exceed 180°F.
• If required:
Adjust the Water Offset in mild weather
. If the ambient building
temperatures are too warm in the mild weather, decrease the Target Offset. If the ambient
building temperatures are too cold in the mild weather, increase the Target Offset. The
rule of thumb for baseboard radiation is to change the Offset 4°F for every 1°F you wish to
change the building temperatures. In radiant heat applications, change the Offset 1°F or 2°F
for every 1°F you wish to change the building temperature.
Outdoor Temperature (in °F)
70
60
50
40
20
30
0
-10
10
-20
120
140
130
150
160
170
180
100
110
W
ater
T
emperature (in °F)
Target Offset
Offset=10°F
Reset Ratio=1.5 : 1.0
Reset Ratio
Max Target
Min Target
Reset Ratio + 10F Offset
Min Target=120°F
Max Target=170°F
seQ and MoV outdoor cutoff
Adjustable 20
º
F/-7
º
C - 100
º
F/38
º
C, On
Default: 70ºF/21ºC
Button:
MENU/<SEQ Setting>/Outdoor Cutoff
SEQ
Button:
MENU/<MOV Setting>/Outdoor Cutoff
MOV
• In Outdoor Reset mode, Outdoor Cutoff will always exist. However, in Set Point mode, if
the outdoor sensor is installed, the Outdoor Cutoff menu option will automatically appear.
• When the outdoor temperature falls to the adjustable Outdoor Cutoff temperature, the
SQ-Elite-MV will control the outputs, whether those outputs are multiple boiler stages or a
motorized valve, to hold the calculated temperature.
-- OUTDOOR CUTOFF -
70 F
[
]
BACK SAVE
