UTICA BOILERS UB90-100, Installation Manual

Page: 42 / 72

42
A. Verify Proper Sequence Of
Operation
The sequence can be followed via the
diagnostic indicator lamps on the Hon-
eywell S9301A integrated boiler control
in
Figure #16.
This is the normal
sequence of operation. A more detailed
sequence of operation containing po-
tential faults can be found in the service
hints section.
seQUeNce oF oPeratioN
“DiaGNostic
iNDicator
laMPs”
“Power ON, boiler standing by. Lamp A is illuminated
indicating 2 Volt power is being supplied to the inte-
grated control.”
A.

B.

C.

D.

E.

Thermostat calls for heat, energizing system circulator
A.

B.

C.

D.

E.

“Integrated boiler control goes through self check of
internal circuitry (1-2 seconds) and energizes draft
inducer”
A.

B.

C.

D.

E.

“Draft inducer comes up to speed and establishes com-
bustion airflow, causing the normally open differential
pressure air proving switch contacts to close. Lamp B is
illuminated indicating that combustion airflow is proved
and the 15 second pre purge cycle”
A.

B.

C.

D.

E.

CHECK OUT PROCEDURE AND ADJUSTMENT
Figure 16 - Indicator Lamps