7/17/2019 bo prot

http://slidepdf.com/reader/full/bo-prot 1/1

BOILER PROTECTION

1  NO POWER AVAILABLE

Any of the boiler protection panel power supply (! "P# VA$% &' V$% )*

+olt% ,1 +olts- is lost.

I.. /AN# O"0 O/ OPERA0ION

When both I fans are inicate out of ser+ice2 /.. /AN# O"0 O/ OPERA0ION

When both / fans are inicate out of ser+ice

&  NO $O3B"#0ION AIR /LOW

Airflow to boiler is less than *4 of a no5inal 5easure +alue of %!!!

6N57% which e8uates to &*!%!!! N579hr.

*  NO #0EA3 E:;A"#0

•  both ;P #V not open < ;P bypass close

• ;P #V close < ;P =V close

• ;P #V not open < 2 out of & ;P =V close

•

 both IP =V close < LP bypass close < R; +ent +al+e close• at start up> furnace probe in ser+ice% furnace ?as te5perature @ **! $%

B$P heaer te5perature 1C! $

C RE=ENERA0IVE AIR ;EA0ER# O"0 O/ OPERA0ION

When both air heaters are reco?niDe as bein? out of ser+ice

R"3 LEVEL LOW LOW

less than )C!! 55 L0:F!*A9B% iscrepancy between the le+el trans5itter

+alues ?reater than 2!4 (harwire to boiler protection panel-

' /"RNA$E PRE##"RE LOW LOW

less than )1.1* 5bar% out of 2 /0OFP#LLF!!1A9B9$

G $ON0ROL AIR PRE##"RE LOW LOW

instru5ent air supply reuces to * bar% out of 2 Press #witches1! /"RNA$E PRE##"RE ;I=; ;I=;

eHcees ,1&.* 5bar% any of /0OFP#;;F!!1A9B9$

11 #$ANNER $OOLIN= AIR PRE##"RE LOW LOW

 below *! 5bar( !.!* bar- for 5ore than 5in /ARFP#LLF!!1A9B

1 /LA3E E0E$0ION /AIL"RE

when one or 5ore coal firin? le+els fail to etect two fla5es on any coal firin?

le+el a fireball etection failure will occur

12 R9BA$6 WI0; A0 L#0 1 3ILL IN 3AN9#03 /LW @ C! 4

R9bacJ initiate with 1 out of 2 5ills in 3AN < not #EL to trip% #/@11&! t9hr 

1& BOILER #0EA3 PRE##"RE ;I=; ;I=;

eHcees 1G* bar ?a?e for 5ore than * sec% /#RFP0F!*!A9B

1*  NO BOILER $IR$"LA0ION P"3P# IN OPERA0ION

 No B$P in ser+ice for 5ore than * sec

1C #0EA3 /LOW @*!4% LE## 0;AN $IR$. P"3P# IN OPER.

#/ @ G*! t9hr < only 1 B$P in ser+ice% 0K1! sec

1 $$R E3ER=EN$ #0OP OPERA0ION

Location> operatorMs esJ or bacJ panel

1' R9BA$6 WI0; /"RN PRE##9AIR /LW 3EA# /A"L0

R9bacJ initiate with out of 2 /0OFP0F!*A9B9$ fault or

3ill A9B9$9 /0F!A9B% /$A9BF/0F!*1 airflow 5easure5ent fault