FLAME SAFEGUARn CONTRULS phần 6 potx

R4138C,D INDUSTRIAL FLAME SAFEGUARD

CONTROLS (FIG. 65)

These controls directly replece older R4138A and B

models to meet the lates! rElQJirements. They are espe￾cially Suitable where Icng petilXi3 01 burner operation with·

out s/'lulc:bwn are normal, such as in heat-treating ovens

and kilns. The R4138D is (he same as the R4138Cwl!hthe

adc:lilion 01 a jXl'I'Ver failure override circuit 10 prevent shut￾down during very short;power outages (,oower line switch￾Ing of. 1 Second or less). The A4138C is available in 120,

220, and.24O volt rtlOdeIS; the A4138D Is available only in a

120 vol'model.

SAFETY FEATURES

The A4138C and D provide a Safe Start Check for a

flame, or a condition simulating a flame, at startup. If the

flame"relay 2K is pulled in before the STAAT button is

pressed• .2K.2 is open, preventing the load relay 1K from

pulling in. The system cannol be started until the condition

Is corrected and 2K drops PUt.

They also prOVide safety shutdown on­

- failure to Ignite the pilor. (lockout will occur t1the

START button is held in IClIlg9f than the 10ckPUt

switch liming.)

-loss 01 flame during the rUl"l period.

-failure in the flame detectiCfl system, If e sell·

cheCking system is' used-see Table II. (L.ockoul

will occur it lhe START b...rIlon is held in longer

than the lockout switch timinQ.)

On safety shutdown. the pilot and main fuel valve(s) are

de-energized. 11 used, the exlernal alarm is energized. The

STAAT bulton must be manu8JJy pressed to restart the

system. "the lockout switch trips. the load relay 1K drq:>s

Oul and the lockout switch must be manually reset to rEt￾start the system.

OTHER FEATURES

" A plu~in $4.27D Purge Timer is available as an ac·

cessory (0 provide e timed purge period prior to the

manual startup.

" An optionei remole reset assembly allows resetting

the lockout switch from a remote location.

" Irlcandescent indicator lamps (FLAME OFF,

PURGE COMPLETE, FLAME ON) prOVide a visual

check: 011he system condl1ion.

• The R4138C or D plugs into a subbase or cabinet

ElQJiA?OO with quick-connect C'-ontacts.

• All field wirinQ (except for the optional remote reset

assembly) is connected to a terminal strip on the

subbase or In the cabinet. The R4138 can be re￾moved easily withoul disconnecting any w·lring.

" Clear plastic relay covers help prevent conlamina￾tion, damage, end lamperinQ.

" An ALARM terminal Is available to operate an exler￾nalline voltage alarm on salety shutdown.

" A zinc-dichromate finish resists the corrosive ef￾fects 01 most induslrial atmospheres.

KEYED IIECEPTA(L[

FOR PlUG·IN

AMPliFIER SPRI",!> CL'P

01'1 CHASSI~ PlUG·I", INCANDESCENT

FlAME SIGNAl INDICATOR

~,,"PlIFIEpR lAMPS(J)I\•••_~--\

,_ '\C<'" .....--.s'!

FLAME 5IGI\IAL \ METER JACK RELAY ZK

THREADED fl.ELAY11( ""OU",TI,,,G

STUD

RELAY JI(

RECEP'TACLE: FOR

PVRGE TIMER

FIG. 55-COMPONENTS OF THE R4138C OR O.

186

------------- --- -- - --- ------------

SEOUENCE OF OPERATION FOR THE R4138C

OR D (FIG. 66)

The cperalion orlhe 120voll models oflhe R4138Cand

D win be described. Theseq.Jel1ceofoperalion for a 220 or

240 volt model ot the R4138C is the same; it just has an

aci:jitionaltransformer 10 provide 120 volts tor the sMutler

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on a C7012E or F Purple Peeper Ultraviolel Flame

Deteclor.

The lad:ler diagram (Fig. 66) shows all relay contaclf; In

the d&energized position. Refer to the S8QJence of 0p￾eration on the following 4 pages.

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FIG. 66- SIMPLIFIED SCHEMATIC DIAGRAM OF TME 120 VOLT MODELS OF THE R4138C AND D

SHOWING TYPICAL FIELD WIRING FOR A GAS OR OIL CUTOFF SYSTEM.

'87 71-97sss..1

SEQUENCE OF OPERATION FOR THE R4138C, D

NOTE: Italics denote special 8HJlications.

NORMAL OPERATION

OPERATOR ACTION R41J8 OPERATION SYSTEM OPERATION

TO START￾1. RElsel tI111 Ioc~ut switch on tile 1, a. ap~lied " terminal ,. a. The lan(5) s\lIrts

R4138. Reset all limrts. and inter­ ".." • Ihrough thE! il1lerlocks and limits, and

"

'bcks. Close the maste!" SWitch.

to terminal 3 Ihrough the jumper Irom

larminal L1: the plug-in amplifier is 8f\o

ergized.

b. Po- i' applied " terminal b. The alarm 115 energized, bU1 may be

('tHough the alarm silaneing switl:hl,

" - turned off by opening the alarm si!enc￾and ID I8rmineJ 16 ('through 3K1). ing switch (If u~d)

, "'""' • app"ed " terminal 18 , None.

(through 3K3): ltle FlAME OFF (RED)

lamp fights.

2. Open the damper D high fire posi­ 2. a. None. 2. a. The high fil"ll interlock closes Whe!1 the

lion (rt mahually operated). damper Is open. (The damper may

open eu1on'lalicalty.)

b. • appfled " terminal 17 tI. The purge perod belilins: the lan(s)

~gh the high fire irrtBr1ock) and to

Pow"

clean the combustion chamber of un￾lhe mobr ofltle pur~e timer (through bU!l19d fuel and fuel vapor.

PT1): 1he purge timer starts.

c. At the end 01 lhe preset time. PT1 ,. Relay 1R pulls In: 1R1 closes to bypass

opens and ll1e purga timer stops. PT2 the nigh fira jnter10ck end keep power

ctJses, IlPPtyinll power Ie terminal 6 applied Ie the purlle timer. (If power is

(Trom terminal L1); the PURGE COM- removed In:m the pur'ile timer, it will

PLETE (GREEN) lamp li'ilhts. reset, PT2 will open. anll tile system

cannot be started.)

3. When the PURGE COMPLETE 3. Nono. 3. The hl'ilh fire inter10ck opens. and the 'uw

,,,.., (GREEN) I8mp II'ilhts. close tile inler10ck "co "'" damper t:J low fire posi1ion damper Is Closed. (The damper may cbse

manualo/ operated).

(' """" "'"

automatically.)

4. Close the alarm silencing switch (II" , None. ,. The alarm is ener'ilized.

it WIlS opened in step 1).

5. Push In the START button and 5. e. ~er is applied Ie the i'ilniOOn trans· 5. a. Tha i~nrtion transformer Is 9n9r~lZall

t1:Ild it In. former and to terminal 6 tthrou'ilh the

NOTE: To avoid nuisance

low lire start lnlertock and the srART

statkJn). shutcbwns when not using

b. ~er Is applied to tarmir.al 7ln:m te!'­ b. None. a purge liry'let, wait at lea$!' minal 6 (II1rou~h the low lire start InlBr­ 10 seconds after the tan in- lock, START statkJn, intemal jl.M"lper,

terlock closes before push-

STOP staOOn, ,"d alarm silencil\l;l

ing in the START bullon.

,

switch).

RBlIlY 1K pulls In throu'ilh LS1, 2K2,

aNl ... LS HTR (\oCkout ...,h

1'I9lIter1. thus provin'il lhlt continuity of

lhlt heater.

(1l 1K1 ebses. applyin'il power to tur· ,. (1) TI"MI pilot vllive (or 1st sta~e oil

minai'S tro-n terminal 3. valve) • ener~lled. The valve

opens and the pilol: (or 191 sta'ila Oil

burner) Is I~n~ed.

(2) Jt the pilfJl/lnlc lumper wi/1l I'!~s been

clipped fr:T 8 continurxJs (sr~ng)

piJfJl app/iC81ion, the tfame derec￾rion circUit fO the amp/if/Sf is com-­

pleted.

(2l 1K2 closes.

(3) lK3 cbses; the LS HTR (lockoul (3) None.

be'ilins heatin'il

(tty autJtransfonner action of 1K

thf'OU'ilh 1K3 and 21<2).

...,h hea""

d. If 8 C7012E cr F PurpJe Peeper U/tfit-­

pJiffet"Js used, power is applied from ter￾d. If an Rrn7C DpIarric Self ChecJc Am￾vir:itJt FlsmtJ DBtacta (NitI'! seIf-eheck·

rrifllll 7 t!roUgl'! Itle Jumper to trJm"inaJ Ing feature) is used, the shtmer is ener·

13, t!roU¢ the sr:iid "'are swircfl in the gized.

81tfJIiffet" (between ampli~B>' tfJi"trlnaJs

16 fIftd 17), 10 ttrrTinaJ 12.

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