Lennox DVR5-CMNS User Manual

TROUBLESHOOTING
THE
ELECTRONIC
IGNITION
SYSTEM
MODELS
_DVR5-CENS,
_DVR5-CEPS,
_DVR5-RENS
AND
_DVR5-REPS
Note:
Before
troubleshooting,
be
sure
that
the
appliance
main
line
gas shut-off
valve,
the
gas
control
valve
and
the
wall
switch
are
inthe
“ON”
position.
Important:
Valve
system
troubleshooting
should
only
be
accomplished
by
a
qualified
service
technician.
iy
* Assure Valve Swlish Is in ON Position
(See Insert A). Voltage Should Be 24V RO
SYMPTOM
POSSIBLE
CAUSES
CORRECTIVE
ACTION
4,
Burner
will
not
light.
A.
Faulty
Valve
System.
See
Below.
B.
Faulty
door
switch.
Remove
wire
nut
from
red
and
blue
leads
attached
to
the
door
switch
and
check
for
continuity.
If
no
continuity,
replace
door
switch.
C.
“OFF/ON”
or
wall
switch
Disconnect
the
two
black
wires
from
the
wire
nuts.
Test
switch(s)
for
defective.
continuity
with
a
multimeter.
If
continuity
is
not
indicated,
switch(s)
is
defective
and
must
be
replaced.
Noite:
Before
replacing
“OFF/ON”
switch,
be
sure
to
check
wiring
for
loose
connections
or
broken
wires
and
repair
as
needed.
2.
Burners
come
“ON”
but
|
A.
Burner
orifice
plugged.
Check
main
burner
orifice(s)
for
stoppage.
Clean
or
replace.
go
“OFF.”
B.
Obstructed
vent
system.
Check
vent
system
for
obstructions.
START
CHECK
Turn
Of
Gas
Suppl
*
Check
For
Proper
Voltage
At
Control
Harness
*
Ling
Voltage
Power
© Low Voltage Transformer
* Disconnect Control Harness
* Set Thermostat To Call For Heat
Between Thermostat Or Pressure Switch
And 24¥ Common And 24¥ Hot.
insert A End View Of
Control Haraess
24 Volt Thermostat «Connector
Door Switch
ol D
24 Volt aD Lo Volt
Common Hot
Cheek For Damaged Or Missing Terminals
In Connector
lasest B
igniter Terminals
igniter Will Cyele Off Aad Back On Once During
The 90 Second ignition Trial. All Voltage
Measurements Must Be Taken White The igniter
ts Powered.
A
YES
Plug Control Harness into Valve. Wait For
internat Check Delay.
© Ipniter Warms Up And Glows Red.
A YES
i NO © Check That Pilot Gas Is Flawing. Wait Tc
© Tum On Gas Supply, © Pllot Burner Lights. Assie Plot Gas Tubing 's Purged. Recytle
Call For Heat if Necessary.
Limit Controfter
© Thermostat
2 Wiring
° With Pilot Burner Cable Connected, Measure
p> Voltage At Vaive HSI Element Output. 24¥
Nominal. (See Insert B) A Ay
Replace Igniter/Flame Rad Assembly.
fis
yrs
RO
Replace Valve.
+ Measure Voltage Between 24V Hot And 24V Common
Leads To Valve Control. Must Measure At Least 19.5
VAG With Igniter Powered (See Insert A). To identify
Proper Lead, This Check Must Be Done With The
Valve Contral Connected And Igniter Powered.
YES
| YES
= Replace Pilot Assembly.
© Main Valve Opens And Main Burner Lights, | #0.
YES
* Check That Pilot Flame Makes Good Contact With
Pilot Burner Flame Rod.
» Check For Good Electrical Connection Through The
Pilot Tubing,
# Tf Both Of The Above Are Good, Replace Igniter/Flame
Rod Assembly.
NO} Cheek Transformer And
Line Volt Sugply.
© System Is Dkay. |
ys
[=cut ‘Thermastat Of And Back On.
A ‘When Measured Voltage At Connections, Use
Care
To Assure Terminals Are Nat Damaged.
«Main Burner Lights.
* Replace Valve.
29
f i r e - p a r t s . c o m

Lennox DVR5-CMNS Specifications

General

Brand	Lennox
Model	DVR5-CMNS
Category	Fireplace Accessories
Language	English