24
Heat-Timer Corp.
seQ and MoV MInIMuM target
Adjustable 70
º
F/21
º
C - 180
º
F/82
º
C
Default: 80
º
F/27
º
C
Hold Button:
MENU/<SEQ Settings>/<Outdoor Reset>/Min. Target
SEQ
Hold Button:
MENU/<MOV Settings>/<Outdoor Reset>/Min. Target
MOV
• For the boiler system loop (SEQ), the Minimum Target must be set to the boiler
manufacturer’s specification. The SQ-Elite-MV will calculate the Set Point based on the
---- MIN TARGET ----
80 F
[
]
BACK SAVE
Outdoor temperature, the Reset Ratio, and the Offset value. The SQ-Elite-MV will control all boilers and the motorized valve to
hold the higher of either the Set Point temperature or the Minimum Target.
• In radiant and air handler applications, this setting should be adjusted to the minimum system design water temperature.
• The SQ-Elite-MV will not allow the calculated water temperature to drop below this setting.
• The Minimum Target must be at least 20°F lower than the Maximum Target. (See next setting).
seQ and MoV MaXIMuM target
Adjustable 90
º
F/32
º
C - 240
º
F/116
º
C
Default: 240
º
F/116
º
C
Hold Button:
MENU/<SEQ Settings>/<Outdoor Reset>/Max. Target
SEQ
Hold Button:
MENU/<MOV Settings>/<Outdoor Reset>/Max. Target
MOV
• This is the highest
heating water temperature the SQ-Elite-MV will circulate.
---- MAX TARGET ----
240 F
[
]
BACK SAVE
• When using a radiation system, it should be set according to the tubing or floor manufacturer’s specification.
• The SQ-Elite-MV will not allow the calculated water temperature to rise above this setting.
• The Maximum Target must be at least 20°F higher than the Minimum Target (See previous setting).
seQ and MoV set poInt settIngs
(not adjustaBle In eMs Mode)
Adjustable -10
º
F/-23
º
C - 230
º
F/110
ºC
Default: 70
º
F/21
º
C
Hold Button:
MENU/<SEQ Settings>/Set Point
SEQ Set Point or EMS 4-20mA
Hold Button:
MENU/<MOV Settings>/Set Point
MOV
• The Set point is the temperature value the SQ-Elite-MV will use to control the system.
----- SET POINT -----
70 F
[
]
BACK SAVE
• The system can be expected to fluctuate around the set point. The amount of fluctuation depends on the control Settings.
• The SQ-Elite-MV will add, subtract, or hold the stages to maintain the SEQ System temperature around the SEQ Set point.
• If the EMS Mode was Enabled, the Set Point will be set by the EMS/BMS system and will be available as a read only.
• 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.
• The SQ-Elite-MV will modulate the motorized valve to maintain the MOV System temperature around the MOV Set point.
• If an Outdoor Sensor was connected, pressing the SAVE button will switch to the Outdoor Cutoff setting option.
BoIler MInIMuM return
When a return sensor is connected to the SQ-Elite-MV, it will be used to monitor and control the boiler return. It does that by
monitoring the Target temperature (SEQ TGT), System temperature (SEQ SYS), Minimum Return, and actual return. (RTN). When
the SQ-Elite-MV predicts that a low return will occur, it will increase the SEQ Target automatically.
MInIMuM return
Adjustable Off, 80
º
F/27
º
C - 140
º
F/60
º
C
Default: 120
º
F/49
º
C
Hold Button:
MENU/<SEQ Settings>/Min. Return
• It is the critical temperature at which the return sensor should be above. Normally, this
setting is provided by the boiler manufacturer or the system engineer.
---- MIN RETURN ----
120 F
[
]
BACK SAVE
• The SQ-Elite-MV will use that value as a guide. It will start to add additional stages if it foresees that the RTN temperature will
drop below the Min. Return. During that period, it will display "
Hold Return at 120 F
" in the Display Message Line
to indicate that the SQ-Elite-MV is sequencing boilers to protect the return from dropping below the Minimum Return.
• Most condensing boilers will run more efficient with cooler return temperatures. In this case, select the
Off
option on the
Minimum Return to allow the monitoring of the return on the display without affecting the
stage sequencing.
return lag
Adjustable 0 - 30 minutes
Default: 2 minutes
Hold Button:
MENU/<SEQ Settings>/Min. Return/Return Lag
• It is the time it takes for the added stages to have an effect on the return temperature.
• To get this time, start with a warm stable system and add a stage manually. Calculate the
---- RETURN LAG ----
2min
[
]
BACK SAVE
amount of time it took to get the return warmer from the start of the stage. That should be your Return Lag.
