103448-02 - 6/13
97
X. Operation
F. Viewing Boiler Status (continued)
F.
Viewing Boiler Status
1.
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.
Data Logging
Real time graphic trends allow users to observe process
changes over time providing valuable diagnostic information.
For example, flame current performance over start up
periods and varying loads can be an indication of gas supply
issues. Additionally, supply and return temperature dual
pen trends brings a focused look at heat exchanger and
pump performance. For example, studying a differential
temperature trend may indicate pump speed settings need
to be changed.
Flame
2.5 hour trend
Flame
5 minute trend
Firing Rate
Supply / Return
>
<
Trends
Cycles and Hours
Boiler cycles and hours are used to monitor the boilers
overall compatibility to the heating load. Excessive
cycling compared to run time hours may be an
indication of pumping, boiler sizing or adjustment
issues.
2000
800
Boiler Cycles
Boiler Cycles/Hours
>
<
i
Run Time Hours
Flame
2.5 hour trend
Flame
5 minute trend
Firing Rate
Supply / Return
>
<
Trends
i
>
<
Status
147
F
160
F
Supply
180
F
Rate
40
%
Stack
Return
Supply 180 F
180 F
Rate
0%
Status: Standby
Setpoint
Boiler 1
>
<
Priority:
Central Heat
i
2000
800
Boiler Cycles
Boiler Cycles/Hours
>
<
i
Run Time Hours
Pump Status/Cycles
>
<
i
System
On
98
Boiler
On
23
DHW Off 0
Heat Demand
>
<
i
Central Heat
On
Domestic Hot Water Off
Sequence Master Off
Frost Protection Off
Frost Protection
On
Exercise
On
Figure 54: Status Screens
Rate:
The rate % value is equal to the actual fan speed
divided by the maximum fan speed.
Setpoint:
this is the active setpoint. This temperature is the
result of Outdoor Air Reset, Setback and Domestic
Hot Water (DHW) selections.
Status:
Information found at the
bottom of the Status screen
and on the Home screen.
Table 31 shows each status
and the action the control
takes during the condition.
Supply
180 F
180 F
Rate
0%
Status: Standby
Setpoint
Boiler 1
>
<
Priority: Central Heat
i
Active
Fault
Rate Limit:
The “
”
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 and light-off
requirements. When a rate limit is the
result of boiler protection logic the
“ ” symbol blinks and becomes a
screen link
Supply:
measured supply water temperature. This is the
temperature being used to start/stop and fire boiler
when there is a call-for- heat.
Priority:
The selected Priority is shown. Available Priorities
are: Standby (no call for heat is present), Sequencer
Control, Central Heat, Domestic HW, Frost
Protection or Warm Weather Shutdown.
Active fault:
A hard lockout will cause the active
fault indication to appear. When
visible the text becomes a screen link
to the “Help” Menu.
Содержание ALP080B
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