Sequence Of Operation - RBI FUTERA XLF Series Installation And Operation Instructions Manual

Figure 17 HeatNet Control Panel
F F Finned copper tube gas boilers & water heaters – Boiler Manual F d b b l

SEQUENCE OF OPERATION

1. Th e boiler is idle with no interlocks in the fault condition.
1. Th e blower operates at purge RPM. Th e water fl ow interlock must
'make' within 15 seconds aft er the demand signal is initiated.
2. Th e Honeywell 7800 starts a 10 second purge delay once the air
1. The blower operates at minimum ignition setting. See the
2. Th e ignition transformer is energized. Th e pilot solenoid valve
1. Th e main gas valve opens.
2. Th e ignition transformer is de-energized.
3. Th e 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. Th e main gas valve closes.
2. Th e blower operates at purge RPM for 10 seconds.
3. Th e boiler is idle with no interlocks in the fault condition.
& h B l M
NO DEMAND
Standby
DEMAND
Pre-Purge
prove switch contacts close.
Pilot Run - %Input
calibration section in the "HeatNet Control-IOM" to enter the
calibration 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
l
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