U.S. Boiler Company Alpine ALP500C, Installation, Operating And Service Instructions

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86
X. Operation
E. Boiler Sequence Of Operation (continued)
3. Status Screens
Boiler Status screens are the primary boiler monitoring screens. The user may simply “walk” though boiler
operation by repeatedly selecting the right or left “arrow” symbol. These screens are accessed by selected the
“Status” button from the “Home” screen.
Figure 53: Status Screen Overview
nOTE
Only visible if Zone Panel is con -
nected. Zone Panel 1 and 2 shown
typical for 1 through 4.
active fault:
A hard lockout will cause the active
fault indication to appear. When vis -
ible the text becomes a screen link to
the “Help” Menu.
rate Limit:
The “
6
” symbol appears to the
right of the Rate % when firing rate
is limited or overridden in any way.
During the start-up and shutdown
sequence it is normal for the rate to
be overridden by the purge, light-
off and low fire hold requirements.
When a rate limit is the result of
boiler protection logic the “
6
” symbol
blinks and becomes a screen link.
rate:
The rate % value is equal to the actual kbtu/hr input
divided by the boiler rated input.
Priority:
The selected Priority is shown. Available Priorities
are: Standby (no call for heat is present), Sequencer
Control, Central Heat, Auxiliary Heat, Domestic Hot
Water, Frost Protection or Warm Weather Shutdown.
Setpoint:
This is the active setpoint. This temperature set -
point determined based on active priority; Central
Heat, Auxiliary Heat or Domestic Hot Water. The
setpoint may be the result of Outdoor Air Reset
and Setback selections.
Supply:
Measured supply water temperature. This is the
temperature being used to start/stop and fire boiler
when there is a call-for- heat. Header temperature is
shown when selected.
Status:
Information found at the bot -
tom of the Status screen and
on the Home screen. Table
44 shows each status and the
action the control takes during
the condition.
Figure 54: Boiler Status Screen Definitions