Sequence Of Operation - RBI Futera XLF Series Manual

Figure 17
HeatNet Control Panel
FTXLF-IOM-HN-1-110308 Copyright 2008 Mestek, Inc.
Finned copper tube gas boilers & water heaters – Boiler manual

seQUence oF operAtion

1. The boiler is idle with no interlocks in the fault condition.
1. The blower operates at purge RPM. The water flow interlock must
'make' within 15 seconds after the demand signal is initiated.
2. The Honeywell 7800 starts a 10 second purge delay once the air
1. The blower operates at minimum ignition setting. See the calibra-
2. The ignition transformer is energized. The pilot solenoid valve
1. The main gas valve opens.
2. The ignition transformer is de-energized.
3. The pilot solenoid valve closes.
4. The blower stays at the minimum input setting for
3 seconds then operates at demand % input. See the calibration
1. The main gas valve closes.
2. The blower operates at purge RPM for 10 seconds.
3. The boiler is idle with no interlocks in the fault condition.
no DemAnD
standby
DemAnD
pre-purge
prove switch contacts close.
pilot run - %Input
tion section in the "HeatNet Control-IOM" to enter the calibra-
tion menus.
opens for the 10 second pilot ignition trial.
Main run %Input
section in the "HeatNet Control IOM" to enter the calibration
menus.
no DemAnD
post-purge
25