4
Provide disconnecting means of sufficient rating within sight of the boiler. These heaters require
an 115V 60hz supply. Depending on the pump used, a 15-amp breaker is usually sufficient.
Electrical connections must be made so that the circulator will operate before the gas valve can
open. At no time may the control system allow the burner to fire without water flowing in the
system.
Use minimum 18-gauge conductor for 24-volt field wiring to boiler. Splicing of wires is not
recommended.
Use sealed tight conduit suitable for outdoor use for outdoor installations.
Use terminal strip provided inside control panel for low water cut-off and remote controller
Refer to wiring diagram provided with boiler.
5. STAGING OPERATION
Staging of the MicoFlame series 2 is dependent on the number of burners supplied. Models
800 and 1000 are supplied with a single burner and are available as on/off and two stages.
Models 1200 through 2000 are supplied with two burners and are available as on/off, 2-stage, 3-
stage and 4-stage.
Each burner is supplied with a dedicated airflow proving signal and separate proved pilot
ignition system. All fans must be running in order for the appliance to proceed to trial for ignition.
MicoFlame series 2 is supplied with more than one burner may use burners that are not of
identical size in order to accommodate fans within the space allocated. In case where burners
are not identical, the right side burner will be the one with the higher input.
Each MicoFlame series 2 is supplied with the appropriate wiring diagram showing the actual
staging sequence provided as well as any special controls or options requested.
When converting multiple MicoFlame series 2 appliances to an external sequencing control it is
absolutely necessary to program the sequencer properly by entering the number of stages
provided on the appliance. In this way the sequencer will lead/lag or rotate the boilers properly.
A full diagnostics panel is provided on the MicoFlame series 2. On a call for heat, status lights
will light up if the particular safety is working properly. Once all safeties have been proved, the
boiler will proceed to trial for ignition and will then sequentially bring on the burner stages (and
the corresponding lights). If the safety proving sequence does not proceed to completion, the
first safety light to remain off will indicate the cause of the problem. All other lights below the
problem indicator light will also remain off.
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