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Output Mode Table
Output Mode
1-On/Off+1-Pump
One On/Off boiler and a System pump
One On/Off boiler, a System pump and
1-On/Off+2-Pump
2-On/Off+1-Pump Two On/Off boilers and a System pump Sys Pump
1-Lo/Hi+1-Pump
One Lo/Hi boiler and a System pump
Three On/Off boilers and NO pumps
3-On/Off
Wiring the Boiler Output
Single-Stage (On/Off) Boiler Wiring
•
If any of the "1-On/Off" Output Modes is selected, wire the two Blue wires to the boiler circuit.
•
If more than one On/Off boiler is to be controlled by the SEQ-3, follow the wiring colors as per
the Output Mode Table above.
•
The SEQ-3 does not source any output power to the boiler. The relay makes when energized.
Two-Stage (Lo/Hi) Boiler wiring
•
Wire the two Blue wires to the boiler control circuit initiating the Low Fire signal.
•
Then, wire the two White wires to the High fire circuit.
•
The SEQ-3 does not source any output power to the boiler. The relay makes when energized.
Wiring the System and DHW Pump Outputs
System Pump Wiring (Not Available With "3-On/Off" Output Mode)
•
The SEQ-3 will control the System Pump relay (Maximum of 1/8 HP) in all Output Modes
except (3-On/Off), as all outputs will be used by boiler stages. In this scenario, the system pump
can be controlled independently using a switch or left to run constantly.
•
Wire the two Yellow wires to the System Pump circuit.
•
The SEQ-3 does not source any output power to the pump. The relay makes when energized to
switch the power to the pump on.
DHW Pump Wiring (Available Only With "1-On/Off+2-Pumps" Output Mode)
•
The SEQ-3 will control the DHW Pump relay (Maximum of 1/8 HP) only in (1-On/Off+2-Pump)
Output Mode. In the other modes, the DHW pump can be controlled using an external DHW
aquastat.
•
If the SEQ-3 is controlling the DHW pump, wire the two White wires to the DHW Pump circuit.
•
The SEQ-3 does not source any output power to the pump. The relay makes when energized to
switch the power to the pump on.
Description
a Domestic Hot Water Pump
SEQ-3 Digi-Elite Operation Manual
5
Output A
Output B
(Yellow
(Blue
Wires)
Wires)
Sys Pump
Boiler
Sys Pump
Boiler
Boiler 1
Sys Pump
Boiler Lo
Boiler 1
Boiler 2
Output C
(White
Notes
Wires)
Not used
DHW
Pump
DHW Pump
controlled by DHW
Boiler 2
Aquastat
DHW Pump
controlled by DHW
Boiler Hi
Aquastat
Sys Pump controlled
using other controls
Boiler 3
or run constantly.
On/Off Boiler
Output Wiring
Blue
Two-Stage Boiler
Output Wiring
Blue (Lo Fire)
White (Hi Fire)
System Pump
Output Wiring
YELLOW
L N
120VAC
DHW Pump
Output Wiring
WHITE
L N
120VAC
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