UTICA BOILERS JE Installation Manual download pdf (Page 8)

Gas Valve Sensing

If either or both the pilot and main gas valves are sensed

to be on when commanded to be off, or if no voltage

appears at gas valve output which was commanded on,

control will shut off all outputs and enter either “soft” or

“hard” lockout state. Main valve is interlocked with the pilot

valve and voltage can only be detected on main valve when

pilot valve is energized. Control locks out the rst time

as “soft” lockout, then retries after 5 minutes and enters

“hard” lockout state. Lockout should be manually reset as

described in “Lockout.”

Flame Present With Gas Off

If ame is sensed for longer than 2 seconds during a period

when gas valve should be closed, control will enter lockout.

Power Interruptions

Power interruptions less than 0.15 seconds will not

cause control to interrupt heat sequence while power

interruptions over 0.25 seconds will cause the control

to reset lockout and ignition trial counters. Power

interruptions of any duration will not cause a lockout or any

other operation requiring manual intervention.

Lockout

Controller automatically resets from rst lockout in 5

minutes. If second lockout occurs before call for heat is

satised, it will require manually resetting by depressing

red button on CSD-1 daughter board. This can be reached

with a pencil through the vent holes. A red LED will also

indicate lockout and can be seen through the vent holes.

SEQUENCE OF OPERATION

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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UTICA BOILERS JE Installation Manual Page 8