heat-timer DIGI-Elite SEQ-3 Assembly, Installation And Operation Instructions page 15

Piping 1 On/Off Boiler +
System Pump + DHW Pump
NOTES:
• The SEQ-3 does not source any output power to any of its
relays. A power source must supply pumps with power and
the control can break the hot leg.
• Heat-Timer recommends using a separate power source
to the control from any pumps, boilers, heavy electric
equipment.
• When wiring a sensor to the SEQ-3, connect the Shield to
the COM terminal on the SEQ-3 end. DO NOT connect
the Shield at the sensor end.
• H eat-Timer is aware that each installation is unique.
Thus, any wiring or piping diagrams in this document
are to represent control operation concept only.
Building
Heat
Boiler1
15
SEQ-3 Plumbing Diagrams
System
Building
Heat
® Outdoor
SYSTEM = 147F
TARGET = 150F Sensor
SYS DHW
Boiler Pump Pump
A B C
SET
R
C O R P O R A T I O N
System
Pump
System
Sensor
Boiler2 Boiler3
SEQ-3 Digi-Elite Operation Manual
®
Outdoor
SYSTEM =
TARGET =
Sensor
SYS
Boiler A Pump B
SET
Pump
System
Sensor
Boiler
Piping 3 On/Off Boilers
Aquastat
DHW
Indirect
DHW
Pump
147F
150F
DHW
Pump C
R
C O R P O R A T I O N
Aquastat
Indirect
DHW Pump
DHW