SETUP & OPERATION
HeatNet Control REV 1.38-1
Page 18
qualifier; Modulation to 40% or a low fire rate will shut the
Base Load boiler off and allow the (3) smaller boilers to
modulate up again (short cycle of the Base Load boiler; Use
the Delay Timer and Min OFF timer). The Stop qualifier;
OA T > xxF may also be used if the system design
temperature is known. Then let the Base Load boiler cycle
off its limits, whether a 2 stage, Hi/Lo, or modulating boiler.
The default setting is for the Base Load boiler to stop first
once the water temperature exceeds the top of the heating
band.
Figure 14
Base Load Relay Wiring
Base Load RIB Relay
24 VAC
24 VAC Return, or
Chassis Ground
Enable Input on
Base Load Boiler
Base Load Relay
1. First ensure that the ADVANCED
SETUP:SYSTEM:OPTION: is set to BASE
LOAD. The Base Load Relay (K8) will not be
enabled/used unless this is selected.
2. Now, The ADVANCED SETUP:BASE
LOAD:BASE LOAD BOILERS: must be set to 1.
3. When the START condition in the BASE
LOAD BOILERS menu is met, the K8 relay will
close. But, only when the DELAY TIME under
the BASE LOAD BOILERS menu expires.
