Crown Boiler 24-07 - Manual (Page 75)

75
A3. 3-way RTC in Primary/Secondary – Heating and DHW using Indirect W
ater Heater; with/without Outdoor Reset
(ELECTRICAL)
NOTES: 1)
Refer to the I&O to determine correct valve orientation and actuator wiring.
2)
120 V
AC supplying the R
TC should be separate from the burner/boiler circuit.
3)
Heat demand can be any electrical signal consisting of 24 – 240 V
AC.
4)
The Outdoor Sensor (S3) and the Mix Supply Sensor (S2) are required if the Outdoor Reset feature is selected.
5)
Use isolation relays for circulators greater than 1/3 HP
. Use motor starters for 3 phase circulators.
6)
System Pump (P3) to be operated by zone relay or other installer supplied device.
This diagram is for reference only
. The installer or designer is responsible for the proper selection and design of the
system.