SQ-Elite-MV & SQ-Elite-EXT Installation Manual
9
wIrIng Inputs
wIrIng tHe power
(terMInals 1, 2)
• Bring the 120VAC 60Hz power wires through the left bottom Knockout of the enclosure.
• Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.
• Connect the hot line to terminal marked L.
• Connect the neutral line to the terminal marked N.
warnIng
• class 1 voltages must enter the enclosure through a different opening from any class 2 voltage wiring.
• Heat-timer recommends installing a surge suppressor on the power source to the sQ-elite.
PWR
L N
1 2
Line
Neutral
120VAC
Power Source
warnIng
connect the shield at the control terminal end and cut the shield wire at the sensor end.
27
29
31
MOV
Temp
33
35
28
30
32
34
36
25
26
SEQ
Temp
Outdoor
TEMP
SHUTDOWN
/TSTAT
/SETBACK
Return
Temp
DHW
Sensor Shiled
MOV SYS Sensor
Sensor Shiled
SEQ SYS Sensor
wIrIng tHe sensors
seQ and MoV systeM teMperature sensor wIrIng
seQ systeM (terMInals 27, 28)
MoV systeM (terMInals 33, 34)
• The SQ-Elite-MV must be connected to a SEQ temperature sensor located in the boilers'
common header.
• In addition, it must be connected to a MOV temperature sensor located after the 3-way motorized valve.
• Each of the System sensors must be inserted in 3/8ID wells (HT #904011-00).
• Temperature sensor wires can be extended up to 500’ by splicing it to a shielded 2-conductor cable (Belden
#8760 or equivalent).
• Temperature sensors have no polarity. Connect the sensor shield to the circled terminal with one of the
sensor wires. The shield MUST NOT be connected at the sensor end.
outdoor sensor wIrIng
(terMInals 29, 30)
• When Outdoor Reset is selected, the SQ-Elite-MV will vary the system Set Point based on outdoor temperature.
• Whether in Set Point or Outdoor Reset modes, the outdoor sensor can be used as an Outdoor Cutoff. The SQ-Elite-
MV will disable all Boilers and close the motorized valve when the outdoor temperature is above the adjustable
Outdoor Cutoff temperature. This feature will automatically be activated when an outdoor sensor is connected.
• For an outdoor sensor, use a Heat-Timer outdoor sensor with the enclosure (HT #904220-00).
• The sensor wires can be extended up to 500’ using shielded 2-conductor cable (Belden #8760 or equivalent).
• Temperature sensors have no polarity. Connect the wires from the outdoor sensor to the SQ-Elite-MV terminals
marked
OUTDOOR TEMP - 29, 30.
• Connect the shield to the circled terminal
30
with one of the sensor wires.
The shield MUST NOT be connected at
the sensor end.
27
29
31
MOV
Temp
33
28
30
32
26
SEQ
Temp
Outdoor
TEMP
Return
Temp
DHW
Sensor Shiled
Outdoor Sensor
return sensor wIrIng
(terMInals 31, 32) optIonal
• If the Return Sensor is connected, must be purchased separately, the SQ-Elite-MV will recognize it and show its
temperature on the display. If the Return is below the Minimum Return, the SQ-Elite-MV will sequence stages
based on the Return Sensor, Minimum Return, SEQ Target, and the actual SEQ System Temperature.
• The Return on the SQ-Elite-MV is designed to be connected to a temperature sensor that can be purchased
separately (HT #904220-00) for immersion in a 3/8ID well (HT #904011-00).
• The sensor wires can be extended up to 500’ using shielded 2-conductor cable (Belden #8760 or equivalent).
• Temperature sensors have no polarity. Connect the wires from the outdoor sensor to the SQ-Elite-MV terminals
marked
OUTDOOR TEMP - 31, 32.
• Connect the shield to the circled terminal
32
with one of the sensor wires.
The shield MUST NOT be connected at
the sensor end.
29
31
MOV
Temp
33
35
28
30
32
34
36
Outdoor
TEMP
SHUTDOWN
/TSTAT
/SETBACK
Return
Temp
Sensor Shiled
Return Sensor
