IBC V-10, Operating Instructions Manual

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OPERATING INSTRUCTIONS
16
V-10 TOUCH SCREEN BOILER CONTROLLER
Heat-apportioning can be altered in the Installer Settings input section. For
instance if Baseboards (set up with Outdoor Reset as Load 3) are not providing
the desired heat, the on-time of the baseboards can be increased by increasing
the Priority value relative to the other declared channels (e.g. moving the Load 3
preset value from 43 to 50 or reducing another load’s value). Temperature targets
for the under-served load could also be raised in this example. The basic function
is that the difference between settings equals the run time (in minutes, for the
initial cycle) of the higher load setting before switch-over to the simultaneously
calling load, e.g. DHW with priority set to 80 will run for approx. 35 min. before
switching to a clashing load set with priority 45. Following such initial cycle, the
competing loads will switch back and forth after further 10 min. intervals pending
satisfaction of one or both loads.
To cause repeated unequal run times (for example, constant 35 vs 5 min. runs) it
is necessary to integrate an external load removing relay or timer on one of the
heat calls (contact the Factory for details). Do not set each load to the top value,
and it is generally better to avoid equal ratings.
NOTE:
the priority scale values
do not need to add up to 100 – they are relative only to each other.
1.7.2 Load Combining
The controller allows two loads of compatible temperature settings to be run
together.
Access to enable the feature and enter the required settings is done by selecting
Load Combining on the Installer Settings screen.
There are 5 parameter settings associated with Load Combining:
PARAMETER DEFAULT MINIMUM MAXIMUM
Primary Load Disabled Load1 Load 4
Secondary Load Disabled Load1 Load 4
Initial Delay 5 2 15
Off Delay 5 2 15
Retry Delay 10 5 60
Maximum Throttle % 75 50 90
1.
Primary Load: Set to the load that will control the boiler operation while
Load Combining is active. This load must have a higher initial priority
than the Secondary Load and should have a higher water temperature
requirement. The Load Combining feature is disabled when this parameter is
set to Disabled .
2.
Secondary Load: Set to the load that will be serviced simultaneously, in
combination with the Primary Load, if the conditions for Load Combining are
met. Load Combining conditions are met;
•
if the supply temperature requirements for the Primary Load are being met,
•
if the supply temperature is within the temperature range requirements of
the Secondary Load and,
•
if the boiler has the capacity to service the Secondary Load as determined
by the Maximum Throttle % setting.
The Load Combining feature is disabled when this parameter is set to
Disabled .