UHA S
TANDARD
U
NIT
H
EATER
I
NSTALLATION
O
PERATION
AND
S
ERVICE
M
ANUAL
38 of 49
14.3 Troubleshootin
g
for Flame Supervision System
NOTE:
Minim
u
m flame pro
b
e c
u
rrent 1 μA DC. Typical flame pro
b
e c
u
rrent 3-5 μA DC.
Repair or replace as
necessary.
If problems persist, contact
Addison at
www.addison-h
v
ac.com
Replace ignition control.
Use General
Troubleshooting section to
trace the fault.
Heater Operating
TROUBLESHOOT ENDS.
N
o
Repair or replace as
necessary.
Is inlet burner gas pressure
correct? Is li
v
e and neutral
polarity correct? Is
flame probe circuit correct?
Is there a current flowing in
the flame probe circuit with
no flame present?
Yes
N
o
Does “lockout” occur when
there is a flame present?
Yes
Is the connecting lead
damaged? Is the flame probe
damaged or touching earthed
components?
N
o
Is the flame present and
at least 1
μ
A DC flame
current?
Connect a DC ammeter in
series with the flame probe.
Yes
N
o
Yes
Yes
N
o
START
To meas
u
re flame c
u
rrent, connect a 0 - 50 μA DC meter in series
w
ith the flame pro
b
e. If the meter
reads negative val
u
es, then reverse the test leads.
Summary of Contents for UHA 150
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Page 44: ...UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 36 of 49 14 1 General...
Page 55: ...SECTION 16 SPECIFICATIONS 47 of 49 SECTION 16 SPECIFICATIONS 16 1 Dimension Data...
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