87
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 54: 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, 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.
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.
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.
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 29 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.
Summary of Contents for Apex APX399
Page 65: ...65 VIII Electrical continued Figure 43 Ladder Diagram ...
Page 66: ...66 VIII Electrical continued ...
Page 67: ...67 Figure 44 Wiring Connections Diagram VIII Electrical continued ...
Page 110: ...110 1P 3 1P 2 1P 1 XIII Repair Parts continued 1C 1D 1E ...
Page 116: ...116 XIII Repair Parts continued ...
Page 118: ...118 XIII Repair Parts continued ...
Page 129: ...129 SERVICE RECORD DATE SERVICE PERFORMED ...
Page 130: ...130 SERVICE RECORD DATE SERVICE PERFORMED ...