Multiple Boiler Sequencer Screens - Burnham Apex APX399 Installation, Operating And Service Instructions

X. Operation
F. Viewing Boiler Status (continued)

3. Multiple Boiler Sequencer Screens

When the Sequence Master is enabled the following screens are available:
The Sequencer Status screen is selected by "pressing" "Status" button from the "Home" screen when Sequence Master is enabled.
Header:
measured header water temperature.
This is the temperature being used to
start, stop and fire boiler when there is
a call-for-heat.
Setpoint:
this is the active setpoint. This
temperature is the result of Outdoor
Air Reset, Setback and Domestic Hot
Water (DHW) selections.
Networked Boiler Status:
Provides connected, start sequence and firing rate status information for all connected boiler addresses. The boiler number is
underlined if the boiler is running and blinks if the boiler has the start sequence in progress. For example the status for boiler
address 1 is provided as follows:
1 - Boiler 1 is connected to the network
1 - "Blinking underline" - boiler 1 is starting
1 - "Solid underline" - boiler 1 is running
The "Networked Boilers" screen is selected by "pressing" the "Detail" button from the "Home" screens and "pressing" Networked
Boilers" from the "Detail" screen.
Boiler Number:
Up to eight (8) boiler's status is
shown
Lead Boiler:
Upon power up the lowest numbered
boiler becomes the lead boiler. The
lead boiler is the first to start and last
to stop. The lead boiler is
automatically rotated after 24 hours of
run time. Additionally, the lead is
rotated if there is a lead boiler fault.
i
Sequencer
132 F
Header
180 F
< Setpoint
100%
Rate
Priority:
Domestic Hot Water
1 ,2 ,3 ,4 ,5 ,6 ,7 ,8
Networked Boilers:
i
Networked Boilers
Boiler 1 Lead 50% Firing
Boiler 2 50% Firing
Boiler 3 0 % Available
Boiler 4 0 % Available
Sequence Status:
Slave boiler status is provide as follows:
Boiler is ready and waiting to be started by the Sequencer Master.
Available:
Add Stage:
Boiler has begun the start sequence but has not yet reached the boiler
running status.
Running:
Boiler is running.
On Leave:
Boiler has left the network to service a DHW demand.
Recovering:
Boiler is in the process of returning to the network. For example, the
slave boiler is in the Postpurge state.
Note: The recovery time is normally 30 seconds. However, if the
slave boiler fails to start the recovery time increases from 30 seconds
to 5, 10 and 15 minutes.
Boiler has a lockout condition and is unable to become available to
Disabled:
the Sequencer Master.
Rate:
The rate % value is equal to the
Sequence Master demand to the
individual boiler. Actual boiler firing
rate is found on the individual boiler
status pages.
>
Priority:
The selected Sequencer Priority is
shown. Available Priorities are:
Standby (no call for heat is present),
Central Heat, Domestic Hot Water,
Frost Protection or Warm Weather
Shutdown.
Firing Rate:
Demanded firing rate is
provided.
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