L.B. White AW250(Smart Box controller) User Manual

Page 21

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21

Problem

Red LED

not on

during a call

for heat.

Is heat

er

connect

ed t

o

its

po

w

er supply?

Connect it t

o

the

po

w

er supply

.

Ye

s

No

Ye

s

Is

pr

oper

v

oltage supplied

to

heat

er po

w

er cor

d

and thr

ough

po

w

er cor

d?

Check dataplat

e f

o

r

electrical supply

req

uirements. Pr

o

vide

pr

oper v

oltage. Check

cir

cuit break

er

s. Check

po

w

er cor

d f

or continuity

.

Is

Smar

t

Bo

x

calling f

or heat?

Pr

ogram the

building contr

oller

and Smar

tBo

x

so

bo

th are calling f

o

r

the same

te

m

perature.

No

No

No

Ye

s

Are

2

4

v

olts supplied

to

ignition

module?

P

oor electrical connection

or br

ok

en wire present.

R

epair or replace.

Ye

s

LED in contr

ol module is

def

ectiv

e. R

eplace ignition

module.

Is

pr

oper

v

oltage supplied

to

transf

ormer?

Check electrical

connections and

po

w

er supply t

o

transf

ormer

.

R

epair as necessar

y.

No

Ye

s

Ye

s

Is

building contr

oller

calling f

or heat?

Set contr

oller t

o

call f

or heat.

No

Are 2

4

v

olts

supplied fr

om

transf

ormer?

R

eplace

transf

ormer

No

Ye

s

Heater does not

cycle from

minimum heat

output.

Is t

e

m

perature

setting aligned

betw

een building

contr

ol and

Smar

tBo

x

No

Is pr

oper gas

pressure supplied

to

heat

er?

Ye

s

Pr

o

vide pr

oper

pressure t

o

heat

er and

check with a gauge.

No

Ensure t

e

m

perature

settings are aligned

betw

een the building

contr

oller and the

Smar

tBo

x

™ . R

eset if

needed.

Is v

ariable rat

e

solenoid on gas

contr

ol v

alv

e

receiving DC v

olts

fr

o

m

Smar

tBo

x

™?

No

Ye

s

Problem

Measure acr

oss t

erminals of

modulating gas contr

ol v

alv

e f

o

r

an

ywhere fr

om 1-1

5 v

olts DC.

If absent, check all wiring. If wiring is

good, the

Smar

t Bo

x

must be

inspect

ed f

or pr

oper operation.

Def

ectiv

e v

ariable rat

e gas contr

ol

solenoid v

alv

e. R

eplace gas

contr

ol.

Ye

s

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