18-CE18D1-1B-EN
67
General Start-up and Adjustment
The following sections give instructions for the general
start-up and adjustment of the gas furnaces.
Preliminary Inspections
With gas and electrical power "OFF", ensure:
1.
Duct connections are properly sealed.
2.
Filters are in place.
3.
Venting is properly assembled.
4.
Blower vestibule panel is in place and all screws in place.
Turn knob on main gas valve within the unit to the "
OFF
" position.
Turn the external gas valve to "ON". Purge the air from the gas lines.
After purging, check all gas connections for leaks with a soapy
solution.
—
DO NOT CHECK WITH AN OPEN FLAME.
Allow 5 minutes for any
gas that might have escaped to dissipate. Turn the gas valve in the
unit to the "ON" position.
Propane Gas being heavier than air may require forced ventilation.
Turn the toggle switch on the Gas Valve in the unit to the “ON”
position.
Lighting Instructions
Lighting instructions appear on each unit. Each installation must be
checked out at the time of initial start up to ensure proper operation of
all components. Check out should include putting the unit through one
complete cycle as outlined below.
Turn on the main electrical supply and set the comfort control above
the indicated temperature. The igniter will automatically heat, then
the gas valve is energized to permit the flow of gas to the burners.
After ignition and flame is established, the flame control module
monitors the flame and supplies power to the gas valve until the
comfort control is satisfied.
W
WA
AR
RN
NIIN
NG
G
F
FIIR
RE
E O
OR
R E
EX
XP
PL
LO
OS
SIIO
ON
N H
HA
AZ
ZA
AR
RD
D!!
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Fa
aiillu
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e tto
o ffo
ollllo
ow
w tth
hiiss W
Wa
arrn
niin
ng
g cco
ou
ulld
d rre
essu
ulltt iin
n
p
prro
op
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errtty
y d
da
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e,, sse
ev
ve
erre
e p
pe
errsso
on
na
all iin
njju
urry
y,, o
orr d
de
ea
atth
h..
D
Do
o N
NO
OT
T a
atttte
em
mp
ptt tto
o m
ma
an
nu
ua
alllly
y lliig
gh
htt tth
he
e ffu
urrn
na
acce
e..
To shut off
For complete shutdown: Turn the toggle or control switch located on
the main gas valve inside the unit to the "OFF" position and the
external main gas shutoff valve to the "OFF" position. Disconnect the
electrical supply to the unit.
Whenever your house is to be vacant, arrange to have someone
inspect your house for proper temperature. This is very important
during freezing weather. If for any reason your furnace should fail to
operate damage could result, such as frozen water pipes.
C
CA
AU
UT
TIIO
ON
N
F
FR
RE
EE
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ZE
E C
CA
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UT
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ON
N!!
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aiillu
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o ffo
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ow
w tth
hiiss C
Ca
au
uttiio
on
n cco
ou
ulld
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n
p
prro
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errtty
y d
da
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e o
orr p
pe
errsso
on
na
all iin
njju
urry
y..
IIff cco
om
mp
plle
ette
e ffu
urrn
na
acce
e ssh
hu
uttd
do
ow
wn
n iiss d
do
on
ne
e d
du
urriin
ng
g tth
he
e
cco
olld
d w
we
ea
atth
he
err m
mo
on
ntth
hss,, p
prro
ov
viissiio
on
nss m
mu
usstt b
be
e tta
akke
en
n tto
o
p
prre
ev
ve
en
ntt ffrre
ee
ezze
e--u
up
p o
off a
allll w
wa
atte
err p
piip
pe
ess a
an
nd
d w
wa
atte
err
rre
ecce
ep
ptta
acclle
ess..
Control and Safety Switch
Adjustment
LIMIT SWITCH CHECK OUT
The limit switch is a safety device designed to close the gas valve
should the furnace become overheated. Since proper operation of this
switch is important to the safety of the unit, it
must be checked out
on initial start up by the installer
.
To check for proper operation of the limit switches, set the thermostat
to a temperature higher than the indicated temperature to bring on
the gas valve. Restrict the airflow by blocking the return air to the
blower. When the furnace reaches the maximum outlet temperature
as shown on the rating plate, the burners must shut off. If they do not
shut off after a reasonable time and overheating is evident, a faulty
limit switch is probable and the limit switch must be replaced. After
checking the operation of the limit control, be sure to remove the
paper or cardboard from the return air inlet, or reconnect the blower.
