IBC V-10, Operating Instructions Manual

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OPERATING INSTRUCTIONS
V-10 TOUCH SCREEN BOILER CONTROLLER
1.6.6 Error Code
The controller continually checks sensors to see that they are operating within
normal parameters. If sensors indicate the boiler is operating outside it limits, it
will declare an error condition.
Two types of error conditions can occur:
•
Minor Errors: result when an abnormal condition exists which does not
present an immediate safety hazard. The boiler shuts off the fuel and enters
an extended purge, followed by the error cycle of 5 minutes for all conditions
other than maximum ignition trials (a modified Major error which locks out for
1 hour after 3 unsuccessful ignition attempts). Following the purge, the fan
and pump are stopped until the end of the error cycle. Normal operation then
resumes.
•
Major Errors: result when a condition exists that may be a safety hazard.
The boiler enters an extended purge then the fan and pump are stopped.
The boiler is in a lockout, and must be checked and restarted by a service
technician.
See the Troubleshooting section 5.3.1 of the boiler’s Installation and Operating
Instructions for a list of errors and their likely causes. Note that other problems
such as disconnected wires or defective sensors may be the cause of the error.
Always check connections and wiring first.
OTHER OPERATING FEATURES
1.7.1 Priority
The control module hosts a scheduling routine to manage the boiler’s operation
when more than one load has been defined. Typically, loads declared as DHW
receive significant - but not absolute - priority. Multiple heating loads - with varying
temperature targets - are run sequentially as opposed to simultaneously (with
a mixing valve). The objective is to serve each load at the minimum possible
temperature, as opposed to running hot then mixing down – with hardware, saving
the related hardware and fuel cost. The approach optimizes the low temperature
combustion benefits of direct cool running of a radiant floor. The large throttle
turndown range coupled with outdoor reset means that several loads can receive
heat in-turn, with less on/ off duty cycling than would occur with other heat sources.
The boiler is shipped with default values for each type of declarable load (e.g.
DHW, radiant floor). The preset variables for DHW (a value of 85-87 on a 20-
90 scale) give it substantial priority, which declines over time if another load is
calling. Spacing heating loads (with Outdoor Reset) are given default values
starting at a low of 28, while other Set Point loads start with 62. Over time, such
points are transferred between the loads in accordance with the system rules.
The boiler will automatically shift between loads once the points totals reach an
upset value. Upon a load transfer, the burner will modulate down to its base level
and will then throttle up as required for the new load. If competing loads have not
been satisfied at the load switch stage, the control will register the firing rate and
will return rapidly to such rate on the next rotation.
1.7