Carlin 201CRD User manual

CARLIN

"CRD"

OIL

BURNERS

MODEL

200CRD

2.00

5.00

GPH

Totally

new

design

and

performance.

Compact,

versatile

3450

rpm

models

using

No.

oil

the

2.00-5.50

gph

range

feature

unique

com¬

bustion

head

which

assures

positive

flame

retention

under

wide

variety

operating

conditions.

MODEL

201CRD

4.00

5.50

GPH

Listed

Underwriters'

Laboratories,

inc

IMPORTANT:

Models

200CRD

and

201CRD

are

identical

all

respects

except

for

the

diameter

the

blower

wheel

(fan)

which

larger

Model

201CRD

provide

adequate

air

for

the

higher

firing

range.

All

other

parts

are

interchangeable,

significant

advantage

servicing

and

keeping

parts

in¬

ventories

the

lowest

possible

level.

Fig.

Flange

mounted.

Fig.

Pedestal

mounted.

Pedestal

flange

mounting

and

Sundstrand

Webster

fuel

unit

are

optional

both

models.

Carlin

"CRD"

oil

burners

feature

adjustable

com¬

bustion

head

assembly

which

permits

regulation

the

air

pattern

the

flame

front

area

for

optimum

velocity

with

symmetrical

distribution

whether

the

firing

rate

the

low,

intermediate,

high

portion

the

firing

range.

The

usual

lack

turbulence

the

lower

firing

range

other

burners

has

been

overcome

and

the

adjustment

feature

"tunes

out"

instabilities

and

rough

starts

inherent

fixed-head

designs.

Significant

advantages

offered

"CRD"

burners

include:

•

Smooth

operation,

relatively

low

noise

level.

•

Clean

combustion;

zero

trace

smoke.

•

Instantaneous

cut-off

assured

solenoid

oil

valve.

•

Higher

CO?

for

optimum

efficiency.

•

Excellent

performance

tested

units

without

refractory

combustion

chamber.

•

Positive

ignition

and

stable

operation.

•

Flame

narrow

and

compact.

•

Insensitive

draft

back

pressure.

•

Can

operate

forced

draft

burner.

•

Highly

resistant

pulsation.

•

Same

air

handling

parts

over

entire

firing

range

each

burner.

•

Compact

design

using

standard

components.

•

Easy

install,

adjust,

and

service.

THE

CARLIN

COMPANY

Wethersfiel

-MKITTTiM'Iÿ

GARUN

III

BURNERS

SPECIFICATIONS

—

DIMENSIONS

STANDARD

MODELS

—

7",

9",

and

air

tube,

flange

ped¬

estal

mounting.

CAPACITIES

—

Model

200CRD,

2.00

5.00

GPH.

Model

CRD,

4.00

5.50

GPH.

(GPH

ratings

are

based

sea

level

2,000

ft.

elevation.

For

every

1,000

ft.

rise

over

2,000

ft.,

reduce

the

maximum

GPH

rating

percent.)

MOTOR

—

3450

RPM,

115-volt,

60-Hz,

l-phasc.

H.P.

with

thermal

overload

protection.

48-frame

with

"N"

flange

per

NEMA

specifications.

TRANSFORMER—

120V/

10,000V.

milliampcrcs,

Hz.

Shielded

against

radio

and

interference.

listed

for

continuous

duty;

interchangeable.

FUEL

UNIT

—

Standard

style

with

7/ic"

shaft

diameter.

3450

RPM.

Designed

for

quick

cut-off.

Single-stage

with

built-in

strainer

and

pressure

regulating

valve.

Strainer

and

nozzle

capacities

exceed

the

maximum

rating

the

burner.

Equipped

with

easy-flow

bleed

valve.

OIL

VALVE

—

Standard

burner

equipped

with

quick

opening

and

instantaneous

closing

magnetic

solenoid

valve

for

smooth,

clean

starts

and

sharp,

clean

cut-offs.

COMBUSTION

HEAD

and

ELECTRODE

ASSEMBLY

—

Unique

CRD

"controlled

flame

retention"

design

provides

adjustable

aerodynamics

that

air

pattern

and

velocities

can

op¬

timized

for

any

nozzle

size

within

the

entire

range

the

burner

without

change

parts.

High-chromium

stainless

steel

electrodes

with

porcelain

insulators

fully

glazed

and

counterbored

for

maximum

clean-

ability

and

safety.

Stainless

steel

heat

shield

air

tube

pre¬

vents

overheating

combustion

head

and

nozzle.

NOZZLE

—

Stainless

steel

with

fine-mesh

strainer.

Spray

angle

and

spray

pattern

specified

for

optimum

combustion.

BLOWER

WHEEL

(FAN)

—

Precision

balanced.

Mounted

directly

motor

shaft.

Dimensions:

Model

200CRD,

5Va"

3Vi"

width.

Model

201

CRD,

5%"

width.

HOUSING

—

Rugged

grey

iron

casting

line-bored

for

accurate

alignment

motor

and

pump

shaft

centerlines.

Streamlined

fan-scroll

for

positive

and

quieter

air

delivery.

COUPLING

—

Flexible-type,

oil-resistant,

short

length

with

slip-

end

fittings

for

easy

service.

CONTROLS

—

Thermostat

and

limit

control.

120-volt,

60-Hz

burner-mounted

primary

relay

with

cadmium

cell

flame

de¬

tector.

Complies

with

requirements.

SHIPPING

WEIGHT

—

Approximately

lbs.

DIMENSIONS

ARE

APPROXIMATE

MOUNTING

PLATE

TYPICAL

FLANGE

APPLICATIONS

EFFECT

BACK

PRESSURE

MAXIMUM

FIRING

RATES

The

maximum

firing

rates

5.00

gph

for

Model

200CRD

and

5.50

gph

for

Model

201CRD

are

based

operation

with

zero

slightly

negative

pressure

such

0.01"

0.03"

W.C.

draft

over

the

fire

normally

encountered

natural

draft

unit.

When

unit

designed

for

forced

draft

operation

with

positive

pressure

(back

pressure)

over

the

fire,

the

maximum

air

capacity

the

burner

reduced

proportion

the

amount

pressure.

result,

the

maximum

firing

rate

also

reduced.

The

graph,

right,

shows

the

maximum

firing

rate

gph

each

model

with

various

amounts

pressure

the

combustion

chamber.

example,

the

Model

200CRD

has

maximum

firing

rate

just

over

gph

when

fired

against

back

pressure

0.20"

W.C.

Note:

Installation

Models

200CRD

and

201CRD

trailers

furnaces

with

than

0.1"

back

pressure

with

undersized

breechlngs

(See

Table

chimneys

(See

Table

not

recommended

unless

the

unit

has

been

pre-tested

with

these

burners

under

these

conditions.

Table

Max.

Firing

Rate

GPH

Min.

Diameter

Smoke

Pipe

(Ins.)

1.80

2.50

3.10

4.50

7.00

RECTANGULAR

ROUND

Max.

Firing

Rate

Chimney

Size

Liner

Size

Max.

Firing

Rate

Uner

Size

GPH

Nom.

(Ins.)

GPH

(Ins.)

2.10

8x8

63/4

1.30

3.50

6i/2

101/2

1.80

5.30

93/4

2.50

7.70

12x16

91/2

131/2

4.50

5.60

Add

height

when

two

units

are

connected

one

chimney.

DRILL

TAP

HOLES

3/fl

FLANGE

UNIVERSAL

FLANGE

MOUNTING

PLATE

OPENING

REFRACTORY

HIGH

TEMP

INSULATION

MODEL

ZOO

CRD

MODEL

0.0

0.40

0.60

0.80

LOO

PRESSURE

COMBUSTION

CHAMBER

(INS

)

INSTALLATION

and

OPERATINQ

INSTRUCTIONS

For

Use

Qualified

Service

Technicians

Only

CARLIN

OIL

BURNERS

Models

200CRD

and

201

CRD

(60-Hz)

FLANGE

MOUNTED

PEDESTAL

MOUNTED

(Pedestal

flange

mounting

optional

both

models.)

DESCRIPTION

"CRD"

burners

feature

combustion

head

incorporating

new

design

concept

which

provides

means

control

the

air

pattern

match

the

nozzle

requirements.

The

aerodynamics

for

optimum

combustion

are

easily

adjusted

for

the

nozzle

size

without

changing

the

air-handling

hard¬

ware.

The

flame

front

initiated

inside

the

air

tube

that

erratic

recirculating

gasses

from

the

main

chamber

area

can

quench

the

flame

the

retention

ring.

The

letters

"CRD"

stand

for

"Controlled

Retention

—

Double

Speed."

Use

small

blower

wheel

(fan)

operating

3450

rpm

provides

positive,

yet

quiet,

air

flow

which

does

not

yield

normal

draft

variations

and

therefore

assures

constant

air-fuel

ratio

for

dependably

clean

combus¬

tion

day

after

day.

Models

200CRD

and

201

CRD

are

identical

design

except

that

the

201

CRD

has

larger

diameter

blower

wheel

and

higher

firing

range.

Model

No.

Blower

Wheel

(Fan)

Size

Firing

Range

200CRD

5Va

dia.

wide

2.00-

5.00

GPH

201CRD

dia.

wide

4.00-

5.50

GPH

ASSEMBLING

THE

BURNER

(TWO-PAK)

Remove

the

air

tube

and

nozzle

line

assembly

from

the

smaller

carton.

nozzle

not

installed,

see

instruc¬

tions

under

(

)

page

(Continued,

page

important

that

the

installation

the

oil

burner,

piping

and

fittings,

safety

devices,

controls,

electrical

wiring

and

equipment

done

accordance

with

national

and/or

local

regulations

the

authorities

having

jurisdiction

over

such

installation.

Fig.

TYPICAL

FLANGE

APPLICATIONS

UNIVERSAL

FLANGE

MOUNTING

PLATE

OPENING

REFRACTORY

HIGH

TEMP

INSULATION

53/4—

DRILL

tap

HOLES

3/8

FLANGE

MOUNTING

PLATE

ASSEMBLING

THE

BURNER

(Cont.)

Remove

the

main

housing

assembly

from

the

larger

carton.

Install

the

nozzle.

Loosen

the

clamping

screw

the

retention

ring

assembly

and

slide

the

retention

ring

off

the

adapter.

Install

and

tighten

the

proper

nozzle

(45°

S-S

Hago)

the

adapter.

careful

not

damage

the

elec¬

trode

insulators

bend

the

wires.

Replace

the

retention

ring

assembly,

slipping

one

the

riveted

arms

through

the

-inch

gap

between

the

electrode

ends.

This

top

arm

should

straight

up.

Also

sure

that

the

retention

ring

clamp

tight

against

the

shoulder

the

adapter.

Then

tighten

the

clamping

screw.

Check

the

electrode

settings

specified

follows:

-inch

gap,

-inch

above

the

nozzle

centerline,

and

14-

5/16-inch

ahead

the

nozzle

tip.

See

Fig.

Swing

open

the

transformer,

and

slide

the

nozzle

line

assembly

into

the

air

tube.

not

force

it.

The

flame

retention

ring

must

lifted

and

guided

through

the

throttle

ring

reduced

diameter)

the

end

the

air

tube.

Place

the

nozzle

line

yoke

the

groove

the

adjusting

screw.

Swing

the

transformer

the

closed

position

and

fasten.

Connect

the

flared

fitting

the

copper

oil

line

the

nozzle

line

and

tighten.

ABOUT

COMBUSTION

CHAMBERS

Models

200CRD

and

201

CRD

operate

with

superior

effi¬

ciency

and

cleanliness

properly

designed

refractory-type

combustion

chambers.

Very

wide

tolerance

burner

adjustments

and

other

variables

found

when

these

cham¬

bers

are

used.

Noise

levels

are

also

reduced.

Table

page

shows

the

recommended

minimum

in¬

side

dimensions

for

refractory

brick,

refractory

pre-cast,

and

pre-formed

refractory

fiber

chambers.

Due

their

quick

warm-up

properties,

the

lightweight

insulating-type

materials

are

slightly

preferable

although

these

burners

show

less

dependence

upon

refractory

temperature

than

models.

Refractory

materials

boilers

and

fur¬

naces

should

capable

withstanding

2600°F

(

1427°C).

The

notes

accompanying

Table

provide

further

details

relative

variations

dimensions

and

geometry.

Refer

Figs.

and

page

FIRING

BOILERS

WITHOUT

REFRACTORY

CHAMBERS

Depending

upon

the

geometry

the

combustion

space

some

units

perform

better

than

others

without

refractory.

When

the

back

wall

the

unit

coincides

approximately

with

the

end

the

flame,

target

refractory

material

essential.

Zero

smoke

readings

are

made

easier

refrac¬

tory

fiber

"rug"

fill

material

used

the

base

under

the

flame.

Table

together

with

its

footnotes,

gives

the

essential

dimensions

and

information

needed

provide

conditions

for

satisfactory

operation

without

complete

chambers.

Refer

Figs.

and

page

INSTALLING

THE

BURNER:

FLANGE

MOUNTED

Measure,

the

burner

opening,

the

distance

from

the

inside

the

combustion

chamber

the

outside

the

mounting

plate

find

the

insertion

length

air

tube

needed.

Position

flange

air

tube

point

from

end

burner

corresponding

this

measurement.

Tighten

set

screws

anchor

flange.

The

flange

now

located

that

the

end

the

burner

will

flush,

almost

flush,

with

the

inside

the

combustion

chamber.

See

Fig.

(side

view)

page

and

Fig.

page

Slide

the

end

the

air

tube

into

the

opening

and

secure

the

flange

the

front

plate

using

three

%-16

cap

screws

(or

studs

and

nuts)

provided.

(Continued,

page

Fig.

Brick

combustion

chamber,

side

view.

REFRACTORY

Fig.

Brick

combustion

chamber,

front

view.

INSULATION

Table

RECOMMENDED

MINIMUM

INSIDE

DIMENSIONS

REFRACTORY-TYPE

COMBUSTION

CHAMBERS

(Inches)

Firing

Rate

(GPH)

Length

(L)

Width

(W)

Dimension

(C)

Suggested

Height

(H)

Minimum

Dia.

Vertical

Cyl.

2.00

5.5

2.50

6.0

3.00

6.0

3.50

6.5

4.00

6.5

4.50

7.0

5.00

7.5

5.50

8.0

Flame

lengths

are

approximately

shown

column

(2).

Often,

tested

boilers

furnaces

will

operate

well

with

chambers

shorter

than

the

lengths

shown

column

(2).

general

practice

any

these

dimensions

can

exceeded

without

much

effect

combustion.

Chambers

the

form

horizontal

cylinders

should

least

large

diameter

the

dimen¬

sion

column

(3).

Horizontal

stainless

steel

cylindrical

chambers

should

inches

larger

diameter

than

the

figures

column

(3).

Wing

walls

are

not

recommended.

Corbels

are

not

necessary

although

they

might

benefit

good

heat

distribution

certain

boiler

furnace

designs.

Table

MINIMUM

DIMENSIONS

RECOMMENDED

BOILERS

FIRED

WITHOUT

REFRACTORY

CHAMBERS

(Inches)

Firing

Rate

(GPH)

Length

(L)

With

Target

Length

(L)

Without

Target

Width

(W)

Dimension

(C)

Dimension

(D)

2.00

5.5

6.5

2.50

6.0

7.0

3.00

6.0

7.5

3.50

6.5

8.0

4.00

6.5

8.0

4.50

7.0

8.5

5.00

7.5

8.5

5.50

8.0

9.0

general

practice

any

these

dimensions

can

exceeded

without

much

effect

combustion.

fiber-type

refractory

"rug"

fill

material

cover

the

floor

area

the

combustion

space

recommended

for

cleaner

combustion

and

protect

the

base.

When

refractory

fiber

target

used,

the

lengths

column

(2)

apply.

the

lengths

are

equal

longer

than

column

(3)

target

material

needed

unless

recommended

the

boiler

manufacturer.

REFRACTORY

Fig.

Scotch

Marine

boiler.

combustion

chamber.

()

C) C)

REFRACTORY

•

Fig-

Wet

leg

boiler.

combustion

chamber,

side

view.

»t

V»

•>

**»**

*—

Fig.

Wet

leg

boiler.

combustion

chamber,

end

view.

Fig.

Wet

leg

boiler,

end

view,

with

low

"crown

sheet."

Semi-brick

chamber

construction

provide

adequate

"C"

and

"D"

dimensions.

Fig.

•«v

<•

•>

Fig.

INSTALLING

THE

BURNER:

PEDESTAL

MOUNTED

Adjust

the

pedestal

that

the

height

the

air

tube

matches

the

location

the

burner

opening.

Slide

the

end

the

air

tube

into

the

opening

that

flush

nearly

flush

with

the

inside

the

combus¬

tion

chamber.

See

Fig.

10.

From

the

outside

the

unit,

seal

the

space

around

the

air

tube

with

asbestos

cement

equivalent.

WIRING

When

the

burner

furnished

with

burner-mounted

primary

control,

field

connections

are

made

the

junction

box

under

the

control.

The

motor,

trans-

SEAL

WITH

ASBESTOS

CEMENT

WIRING

(Cont.)

former,

oil

valve,

and

flame

detector

are

pre-wired.

High

limit,

low

water

cut-off,

fusible

link

switch,

emergency

and

service

switches

are

wired

series

between

the

hot

supply

lead

and

the

unwired

black

lead

the

control.

The

ther¬

mostat

operating

control,

used,

wired

"T"

and

"T."

Otherwise,

jumper

"T"

and

"T."

When

the

primary

control

mounted

the

boiler

furnace,

the

motor,

transformer,

and

oil

valve

connections

are

joined

the

junction

box

mounted

the

motor.

115-

20V

SUPPLY

THERMOSTAT

operating

CONTROL

LIMITS

WHITE

KEY

YELLOW'

•

FACTORY-

WIRED

CARLIN

FIELO

WIRING

GROUND

IGN.

-0

IGNITION

TRANSFORMER

ELECTRONIC

TIME

DELAY

OIL

VALVE

Fig.

HONEYWELL

TYPE

R8184G

CONSTANT

IGNITION

NOTE:

CONSTANT

IGNITION

Spark

"ON"

during

entire

burning

cycle.

*E.T.D.

not

furnished

standard

equipment.

FLAME

DETECTOR

Fig.

HONEYWELL

TYPE

8185E

INTERMITTENT

IGNITION

NOTE:

INTERMITTENT

IGNITION

Spark

"ON"

only

burner

start.

*E.T.D.

not

furnished

standard

equipment.

15-

120V

SUPPLY

—

thermostat

OPERATING

CONTROL

LIMITS

WHITE

KEY

YELLOW'

•

FACTORY-WIRED

CARLIN

FIELD

WIRING

GROUND

IGN.

IGNITION

TRANSFORMER

ELECTRONIC

TIME

DELAY

OIL

VALVE

FLAME

DETECTOR

HOW

ADJUST

THE

COMBUSTION

HEAD

RETENTION

RING

AND

The

retention

ring

position

ahead

the

throttle

ring

adjustable

from

zero

(flush)

'/a

-inches

(Dimension

"A",

Figs.

and

14).

Turning

the

adjusting

screw

(clockwise)

increases

the

distance

"A"

ahead.

This

dis¬

tance

indicated

reading

the

scale

the

nozzle

line

across

the

corners

sides

the

channel

guiding

the

noz¬

zle

line.

Each

division

1/16-inch.

AIR

SHUTTER

ADJUSTMENTS

(Cont.)

adjusting

the

assembly

further

ahead

and

reducing

the

air

pressure

(closing

the

air

shutter).

this

case

(3.50

gph)

the

maximum

position

would

9/16-inch

ahead;

and

the

air

shutter

would

percent.

This

latter

combina¬

tion

settings

might

require

refractory

chamber

for

clean

combustion.

Tables

and

are

provided

guide.

Fig.

THROTTLE

RING

RETENTION

RING

Fig.

STOP

NUT

NOZZLE

LINE

YOKE

SCALE

ADJUSTING

SCREW

INDICATED

FROM

THIS

POINT

Table

RECOMMENDED

SETTINGS

FOR

MODEL

200CRD

(5V4"

33/4"

Blower

Wheel)

Retention

Ring

Setting,

Air

Shutter

Firing

Rate

Inches

Scale,

Opening

GPH

Dimension

"A"

(Percent)

2.00

2.50

=*=

•

3.00

=*=

=»=

3.50

Vis

=*=

4.00

4.50

13/ig

=*=

5.00

15/i6

=*=

Vis

100

Table

RECOMMENDED

SETTINGS

FOR

MODEL

201CRD

(53,4"

Blower

Wheel)

Firing

Rate

GPH

Retention

Ring

Setting,

Inches

Scale,

Dimension

"A"

Air

Shutter

Opening

(Percent)

4.00

Vis

4.50

5.00

Vis

=*=

5.50

=*=

NOZZLE

SPECIFICATIONS:

45°

S-S

HAGO

Other

makes

nozzles

may

not

prove

satisfactory.

Sufficient

test

data

not

available

make

other

recom¬

mendations.

The

correlation

nozzle

sprays

between

dif¬

ferent

manufacturers

not

consistent.

For

special

applications,

other

specifications

might

pro¬

vide

desirable

pattern.

RETENTION

RING

AND

AIR

SHUTTER

ADJUSTMENTS

Tables

and

show

for

each

firing

rate

the

recommended

positions

the

flame

retention

ring

with

the

corresponding

amounts

air

shutter

opening.

With

the

retention

ring

set

the

minimum

recommended

distance

ahead,

air

pressure

needed,

and

the

fire

intense,

therefore

better

for

operating

without

refractory

chambers.

For

in¬

stance,

3.50

gph

with

the

retention

ring

5/16-inch

ahead

and

the

air

shutter

100

percent

open

very

in¬

tense,

hot

flame

would

developed

that

should

optimum

for

clean

burning

with

chamber.

softer,

quieter

flame

(somewhat

longer,

too)

would

developed

SEE

PAGE

FOR

FUEL

UNIT

AND

OIL

LINE

DATA,

LIGHT-OFF

AND

ADJUST¬

MENT,

AND

EFFECT

BACK

PRES¬

SURE

MAXIMUM

FIRING

RATES.

FUEL

UNITS

AND

OIL

LINES

Standard

burners

are

provided

with

single-stage

3450

rpm

fuel

units

with

the

by-pass

plug

removed

for

single-pipe

installations.

single-pipe

system

recommended

whenever

the

bot¬

tom

the

fuel

tank

above

the

burner

the

same

level

the

burner.

This

includes

outdoor

fuel

tanks

that

are

such

levels.

two-pipe

system

recommended

when

the

fuel

tank

below

the

level

the

burner,

and

the

fuel

unit

must

pull

(lift)

the

fuel

the

burner.

For

two-pipe

installations

the

by-pass

plug

must

installed.

Table

shows,

for

the

standard

single-stage

fuel

unit,

the

allowable

lift

and

lengths

Vi"

and

tubing

for

both

suction

and

return

lines

two-pipe

systems.

Table

SINGLE-STAGE

UNITS

—

TWO-

PIPE

SYSTEMS

(SUNDSTRAND

JA2BB-100)

Lift

Length

Tubing

(feet)

V%"

100

100 100

100

When

using

the

optional

two-stage

fuel

unit

greater

amount

lift

attainable

shown

Table

TWO-STAGE

UNITS

—

TWO-PIPE

SYSTEMS

(SUNDSTRAND

H2PB-100)

Lift

Length

Tubing

(feet)

Vt"

100

CARLIN

COMPANY

912

SILAS

DEANE

HIGHWAY

WETHERSFIELD,

CONNECTICUT

Form

No.

202

sure

that

all

oil

line

connections

are

absolutely

airtight.

Check

all

connections

and

joints.

Flared

fittings

are

recom¬

mended.

not

use

compression

fittings.

Open

the

air-bleed

valve

and

start

the

burner.

For

clean

bleed,

slip

16"

hose

over

the

end

the

bleed

valve

and

bleed

into

container.

Continue

bleed

for

seconds

after

oil

free

air

bubbles.

Stop

the

burner

and

the

bleed

valve.

LIGHT-OFF

AND

ADJUSTMENT

Before

re-starting

the

burner,

preset

the

air

shutter

and

the

retention

ring

position

for

the

particular

firing

rate

ac¬

cording

Table

for

200CRD

Table

page

for

70ICRD.

the

fire

little

too

rich,

open

the

air

shutter

move

the

combustion

head

forward

increasing

dimension

"A,"

Fig.

13,

page

the

lower

inputs,

very

slight

change

usually

enough.

Adjust

draft

0.0

0.03

inches

over

the

fire

for

natural

draft

units.

Run

smoke

test.

Strive

for

zero

trace.

Each

time

further

adjustment

air

retention

ring

made,

reset

the

draft

0.01

0.03

inches

over

the

fire.

Check

CO2.

This

should

over

percent,

and

will

often

over

percent,

well-sealed

unit.

Check

for

good

ignition

and

clean

cut-off.

cut-off

con¬

tinues

poor,

look

for

air

leaks

the

suction

line

and

correct

them.

EFFECT

BACK

PRESSURE

MAXIMUM

FIRING

RATES

The

maximum

firing

range

for

"CRD"

models

(5.00

gph

for

Model

200CRD

and

5.50

gph

for

Model

201CRD)

based

operation

with

zero

slightly

negative

pressure

such

0.01

0.03

inches

draft

over

the

fire

normally

encountered

natural

draft

unit.

When

unit

designed

for

forced

draft

operation

with

positive

pressure

(back

pressure)

over

the

fire,

the

maxi¬

mum

air

capacity

the

burner

reduced

proportion

the

amount

pressure.

result,

the

maximum

firing

rate

also

reduced.

Fig.

shows

the

maximum

firing

rate

gph

each

model

with

various

amounts

pressure

the

combustion

chamber.

example,

the

Model

200CRD

has

maximum

firing

rate

just

over

4.00

gph

when

fired

against

back

pressure

0.20

inches

Fig.

Printed

MODEL

201

CRO

MODEL

200

CRD

PRESSURE

COMBUSTION

CHAMBER

(INS.

W.C.)

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