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5. Multiple Boiler Sequencer Screens
When the Sequence Master is enabled the following screens are available:
X. Operation
E. Boiler Sequence Of Operation (continued)
Sequence Status:
Slave boiler status is provide as follows:
Available:
Add Stage:
Running:
On Leave:
Recovering:
Disabled:
Boiler is ready and waiting to be started by the Sequencer
Master.
Boiler has begun the start sequence but has not yet
reached the boiler running status.
Boiler is running.
Boiler has left the network to service a DHW demand.
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 the Sequencer Master.
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.
Firing Rate:
Demanded firing rate is
provided.
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
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, Auxiliary Heat,
Domestic Hot Water, Frost Protection
or Warm Weather Shutdown.
Summary of Contents for Alpine ALP080B
Page 76: ...76 103448 10 6 18 VIII Electrical continued...
Page 77: ...103448 10 6 18 77 VIII Electrical continued Figure 27 Wiring Connection Diagram...
Page 78: ...78 103448 10 6 18 Figure 28 Ladder Diagram VIII Electrical continued...
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Page 147: ...103448 10 6 18 147...
