Advertisement
Table 5 -- Air Delivery (Cfm) at Indicated Temperature
Rise and Rated Heating Input
HEATING
TEMPERATURE
RISE °F
INPUT
(Btuh)
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
40,000
1389
1111
926
794
694
617
556
........
56,000
2083
1667
1389
1190
1042
926
833
758
.......
80,000
2778
2222
1852
1587
1389
1235
1111
1010
926
855
794
....
95,000
3472
2778
2315
1984
1736
1543
1389
1263
1157
1068
992
926
868
--
--
120,000
4167
3333
2778
2381
2083
!852
1667
1515
1389
1282
1190
1111
1042
980
928
136,000
5037
4029
3358
2878
25!8
2238
20!4
1831
1679
1549
1439
1343
!259
1185
!119
NOTE:
Dashed areas do not fall within the approved temperature
rise range of the unit.
P
BURNERFLAME
°°
Fig. 20 -- Monoport Burners
F. Heating
Sequence
of Operation
See Fig.
21-23 and unit
wiring
label.
On a call
for heating,
terminal
"W" of the thermostat
is en-
ergized,
starting
the
induced
draft
motor.
When
the
hall
effect
sensor
on the
induced
draft
motor
senses
that
it has
reached
the
required
speed,
the burner
sequence
begins.
This
flmction
is performed
by the
integrated
gas
control
(IGC).
The
evaporator-fan
motor
is energized
45 seconds
after
flame
is
established.
When
the thermostat
is satisfied
and
"W" is deen
ergized,
tire burners
stop
firing
and
the evaporator
fan motor
shuts
off after" a 45 second
time
off delay.
A LED
(light-emitting
diode)
indicator
is provided
on the
con-
trol board
to monitor
operation.
The
control
board
is located
by removing
the
burner
access
panel.
During
normal
opera
tion,
the
LED
is continuously
on. See Table
6 for error
codes.
Table
6 --
LED Indications
ERROR CODE
LED INDICATION
Normal Operation
On
Hardware
Failure
Off
Fan On/Off Delay Modified
1 Flash
Limit Switch Fault
2 Flashes
Flame Sense Fault
3 Flashes
Four Consecutive
Limit Switch Faults
4 Flashes
Ignition Lockout Fault
5 Flashes
Induced-Draft
Motor Fault
8 Flashes
RolIout Switch Fault
7 Flashes
Internal Control Fault
8 Flashes
NOTES:
1. There is a 3-second pause between error code displays.
2. If more than one error code exists, all applicable error codes will be
displayed
in numerical sequence.
3. This chart is on the wiring diagram located inside the burner access
panel.
G.
Limit
Switches
Normally-closed
limit
switch
(LS) completes
the
control
cir-
cuit
through
the
thermostat
R circuit.
Should
the
leaving-air
temperature
rise
above
the
maximum
allowable
tempera-
ture,
the
limit
switch
opens
and the
R control
circuit
"breaks."
Any
interruption
in the
R control
circuit
instantly
closes
the
gas
valve
and
stops
gas
flow to the
burners
and
pilot.
The
blower
motor
continues
to run
until
LS resets.
When
the
air
temperature
at the
limit
switch
drops
to the
low-temperature
setting
of the
limit
switch,
the
switch
closes
and
completes
tire
R control
circuit.
The
electric-spark
igni
tion
system
cycles
and
the
unit
returns
to normal
heating
operation.
H. Auxiliary
Limit
Switch
--
Rollout
The
function
of the
switch
is to close
the
main
gas
valve
in
the
event
of flame
rollout.
The
switch
is located
above
the
main
burners.
When
the
temperature
at the
auxiliary
switch
reaches
the
maximum
allowable
temperatm'e,
the
R control
circuit
trips,
closing
the
gas
valve
and
stopping
gas
flow
to
the
burners.
The
indoor
(evaporator)
fan
motor
(IFM)
and in
duced
draft
motor
continue
to run
tmtil
switch
is reset.
--19--
Advertisement
