Flame Safeguard System

diagnostics.

c

Flame safeguard system cabinet shall house overcurrent protective

devices, and motor starters for the combustion air fan motor,

burner damper motor and electric oil heater. Control transformers

and an RS-232C serial communication port shall also be included.

d.

Flame scanner shall not require a separate purge air supply. Flame

scanner output signal shall be connected to flame amplifier module

in microprocessor based unit. Within four seconds after loss of

flame, flame safeguard controller shall shut the automatic safety

shut-off fuel valve[s] [and open the gas automatic vent valve].

Flame failure signal shall be displayed on flame safeguard display

or burner control panel.

e.

Logic provided with flame safeguard system shall:

1. Prevent introduction of ignitor flame (pilot) or main fuel

flame to furnace until furnace, boiler passes, breeching and stack

have been purged of combustible gases.

2. Prevent opening of automatic fuel shut-off valves in main fuel

line until ignitor flame is proven.

3. Limit trial for main fuel ignition to ten (10) seconds from

time ignitor flame is proven.

4. In event of burner failure, operator intervention shall be

required to manually reset flame safeguard controller prior to

restart.

f.

First-out annunciation shall be provided by an expansion module.

Alarms and flame-outs shall be individually annunciated at panel

front and transmitted along with other process points monitored by

the panel to [Central Monitoring System (CMS)] [Supervisory

Computer Workstation[s]] for graphic display. Following points,

at a minimum, shall be individually annunciated by flame safeguard

system:

1.

Low water level.

2.

Low water cutoff.

3.

High water level.

4.

High steam pressure.

5.

Low atomizing [steam pressure] [or] [air pressure].

6.

Low fuel oil pressure.

7.

Low fuel oil temperature.

8.

High natural gas pressure.

9.

Low oxygen concentration.

g.

Flame safeguard system cabinet shall be provided with [natural

gas] [No. 6] [No. 4] [and] [No. 2] oil fuel selector. Selector

SECTION 15561A

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