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START-UP,
ADJUSTMENT,
AND SAFETY
CHECK
li
Step 1 mGeneral
FIRE HAZARD
Failure
to follow
this warning
could
result
in personal
iniury,
death and/or property
damage.
This furnace is equipped
with manual
reset limit switches
in
the gas control
area. The switches
open and shut off power
to the gas valve
if a flame rollout or overheating
condition
occurs
in
the
gas
control
area.
DO
NOT
bypass
the
switches.
Correct
inadequate
combustion
air
supply
problem
before resetting
the switches.
CUT HAZARD
Failure
to follow
this caution
may result in personal
injury.
Sheet metal parts may have sharp edges or burrs.
Use care and wear
appropriate
protective
clothing,
safety
glasses,
and
gloves
when
handling
parts
and
servicing
furnaces.
1. Maintain 115-v wiring and ground. Improper polarity will
result in rapid flashing LED and no furnace operation,
2. Make thermostat wire connections
at the 24-v terminal
block on the furnace control. Failure to make proper con-
nections will result in improper operation, (See Fig. 26,)
3, Gas supply pressure to the furnace must be greater than
4,5-In, W,C, (0,16 psig ) but not exceed 14-In, W,C, (0,5
psig).
4. Check all manual-reset
switches for continuity.
5. Install blower compartment door. Door must be in place to
operate furnace.
6. Replace outer door.
Step 2 reStart-Up
Procedures
FIRE AND EXPLOSION
HAZARD
Failure
to follow
this warning
could
result
in personal
iniury,
death and or property
damage.
Never
test
for gas
leaks
with
an
open
flame.
Use
a
commercially
available
soap solution
made
specifically
for
the detection
of leaks to check
all connections.
A fire or
explosion
may
result
causing
property
damage,
personal
iniury or loss of life.
1. Purge gas lines after all connections
have been made.
2. Check gas lines for leaks.
ELECTRICALSHOCK
HAZARD
Failure
to follow
this warning
could
result
in personal
iniury,
or death.
Blower
access door switch
opens
l15-v
power
to control.
No component
operation
can occur
unless switch
is closed.
Caution
must be taken
when
manually
closing
this switch
for service purposes.
3. To Begin
Component
Self-Test:
Remove
blower
access
door.
Disconnect
the thermostat
R lead from
the furnace
control
board.
Manually
close
the blower
door
switch.
Short
(jumper)
the COM-24v
terminal
on control
to the
TEST/TWIN
3/16-inch
quick connect
terminal
on control
until LED
goes out (approximately
2 sec). Gas valve
and
humidifier
will not be turned on. (See Fig. 25.)
NOTE:
The furnace
control
allows
all components,
except
the
gas valve,
to be run for short period
of time. This
feature
helps
diagnose
a system
problem
in case
of a component
failure.
Component
test feature will not operate
if any thermostat
signal is
present
at the control.
Component
test sequence
is as follows:
Refer to service label attached
to furnace or see Fig. 45.
a. LED will display
previous
status code 4 times.
b. Inducer
motor starts and continues
to run until Step f
of component
test sequence.
c. Hot surface igniter
is energized
for 15 sec., then off.
d. Blower
motor operates
on HEAT speed for 10 sec.
e. Blower
motor operates
on COOL speed for 10 sec.
f. Inducer
motor stops.
g. Reconnect
R lead to furnace
control
board, release
blower
door switch
and re-install
blower
door.
4. Operate
furnace
per instruction
on door.
5. Verify furnace
shut down
by lowering
thermostat
setting
below room temperature.
6. Verify furnace
restarts
by raising
thermostat
setting
above
room temperature.
Step 3 --Adjustments
Table
10--Altitude
Derate
Multiplier
for U.S.A.
ALTITUDE
PERCENT
DERATE MULTIPLIER
FT.(M)
OF DERATE
FACTOR*
0-2000
0
1.00
(0-610)
2001-3000
8-12
0.90
(610-914
/
3001-4000
12-16
0.86
(914-1219)
4001-5000
16-20
0.82
(1219-1524)
5001-6000
20-24
0.78
1524-1829)
6001-7000
24-28
0.74
(1829-2134)
7001-8000
28-32
0.70
(2134-2438)
32
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