INTRODUCTION
HeatNet Control V3 3.x
Page 7
In a stand-alone installation the MEMBER typically
receives its command signals internally and operates based
upon the outlet water temperature and the established
settings in the menu (LOCAL SETPOINT) to start/stop the
burner, and/or to modulate the firing rate. If the operating
limit is exceeded, or if an interlock trips, the boiler is shut
down. As in a multi-boiler system, a stand-alone MEMBER
boiler is also capable of receiving inputs from an external
control system.
When using the H-Net network cable in a
MASTER/MEMBER system, the system setpoint is sent
from the MASTER as a digital signal, along with the
modulation value to control firing rate. It also receives its
command to start or stop over the H-Net cable. Also, the
SYSTEM CLOCK only needs to be set on the MASTER.
The MASTER will then set the time on all MEMBER
boilers.
If not using the H-Net protocol (cable), an external control
can send a 4-20mA signal along with a 4-20mA enable
signal to control the firing rate or setpoint. The boiler may
also be treated as a 2-stage boiler or an ON-OFF boiler
using the dedicated T-inputs.