AHRI APEX, Installation, Operating And Service Instructions

Page: 81 / 124

81
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.
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 37: Status Screens
Flame
2.5 hour trend
Flame
5 minute trend
Firing Rate
Supply / Return
> <
Trends
2000
800
Boiler Cycles
Boiler Cycles/Hours
> <
i
Run Time Hours
Data Logging
Real time graphic trends allow users to observe process
changes over time providing valuable diagnostic
information. For example, fl ame 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.
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.
<
Supply:
measured supply water temperature. This is the
temperature being used to start/stop and fire boiler
when there is a call-for- heat.
Setpoint:
i
this is the active setpoint. This temperature is the
Boiler 1
Supply
180 F
Active
Fault
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.
Rate Limit:
The “ ” symbol appears to the right
result of Outdoor Air Reset, Setback and Domestic
Setpoint
180 F
>
of the Rate % when firing rate is
Hot Water (DHW) selections.
Rate:
The rate % value is equal to the actual fan speed
divided by the maximum fan speed.
Status:
Rate
0%
Priority: Central Heat
Status: Standby
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
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.
Information found at the
bottom of the Status screen
and on the Home screen.
Table 26 shows each status
and the action the control
takes during the condition.
“ ” symbol blinks and becomes a
screen link