N80ESN/N80ESL(Series A): Installation, Start–Up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
30
7. Adjust blower off delay The blower off delay has 4 adjustable
settings from 90 sec to 180 sec. The blower off delay jumpers are
located on the furnace control board (see
).
To change the blower off delay setting, move the jumper from one
set of pins on the control to the pins used for the selected blower off
delay. Factory off delay setting is 120 sec.
8. Set airflow CFM for cooling
Select the desired blower motor speed lead for cooling airflow. See
-Air Delivery-CFM (With Filter) for lead color
identification.
Check Safety Controls
The flame sensor, gas valve, and pressure switch were all checked in the
Start-up procedure section as part of normal operation.
1. Check Main Limit Switch(es)
This control shuts off combustion control system and energizes
air-circulating blower motor, if furnace overheats. By using this
method to check limit control, it can be established that limit is
functioning properly and will operate if there is a restricted duct
system or motor failure. If limit control does not function during
this test, cause must be determined and corrected.
a. Run furnace for at least 5 minutes.
b. Gradually block off return air with a piece of cardboard or sheet
metal until the limit trips.
c. Unblock return air to permit normal circulation.
d. Burners will re-light when furnace cools down.
2. Check draft safeguard switch.
The purpose of this control is to cause the safe shutdown of the
furnace during certain blocked vent conditions.
a. Verify vent pipe is cool to the touch.
b. Disconnect power to furnace and remove vent connector from
furnace vent elbow.
c. Restore power to furnace and set room thermostat above room
temperature.
d. After normal start-up, allow furnace to operate for 2 minutes,
then block vent elbow in furnace 80 percent of vent area with a
piece of flat sheet metal.
e. Furnace should cycle off within 2 minutes. If gas does not shut
off within 2 minutes, determine reason draft safeguard switch did
not function properly and correct condition.
f. Remove blockage from furnace vent elbow.
g. Switch will auto-reset when it cools.
h. Re-install vent connector.
NOTE:
Should switch remain open longer than 3 minutes, furnace
control board will lockout the furnace for 3 hours. To reset furnace
control board, turn thermostat below room temperature or from HEAT to
OFF and turn 115v power OFF, then back ON.
3. Check Pressure Switch
This control proves operation of the draft inducer blower.
a. Turn off 115-v power to furnace.
b. Disconnect inducer motor lead wires from wire harness.
c. Turn on 115-v power to furnace.
d. Set thermostat to “call for heat” and wait 1 minute. When
pressure switch is functioning properly, hot surface igniter
should NOT glow and control flashes a status code 3. If hot
surface igniter glows when inducer motor is disconnected, shut
down furnace immediately.
e. Determine reason pressure switch did not function properly and
correct condition.
f. Turn off 115-v power to furnace.
g. Reconnect inducer motor wires, replace outer door, and turn on
115-v power.
h. Blower will run for 90 sec and flash status code 1+2 before
beginning the call for heat again.
i. Furnace should ignite normally.
Checklist
1. Put away tools and instruments. Clean up debris.
2. Verify that blower OFF-DELAY time is selected as desired.
3. Verify that blower and burner access doors are properly installed.
4. Cycle test furnace with room thermostat.
5. Check operation of accessories per manufacturer’s instructions.
6. Review User’s Guide with owner.
7. Attach literature packet to furnace.
SERVICE AND MAINTENANCE PROCEDURES
Untrained personnel can perform basic maintenance functions such as
cleaning and replacing air filters. All other operations must be performed
by trained service personnel. A qualified service person should inspect
the furnace once a year.
30
120 240 600
80
45
90
225
31
116 232 581
82
44
88
220
32
113 225 563
84
43
86
214
33
109 218 545
86
42
84
209
34
106 212 529
88
41
82
205
35
103 206 514
90
40
80
200
36
100 200 500
92
39
78
196
37
97 195 486
94
38
76
192
38
95 189 474
96
38
75
188
39
92 185 462
98
37
74
184
40
90 180 450
100
36
72
180
41
88 176 439
102
35
71
178
42
86 172 429
104
35
69
173
43
84 167 419
106
34
68
170
44
82 164 409
108
33
67
167
45
80 160 400
110
33
65
164
46
78 157 391
112
32
64
161
47
76 153 383
116
31
62
155
48
75 150 375
120
30
60
150
49
73 147 367
Table 13 – Gas Rate (Cu Ft./Hr.) (Continued)
SECONDS
FOR 1
REVOLUTION
SIZE OF TEST
DIAL
SECONDS
FOR 1
REVOLUTION
SIZE OF TEST
DIAL
1 Cu
Ft.
2 Cu
Ft.
5 Cu
Ft.
1 Cu
Ft.
2 Cu
Ft.
5 Cu
Ft.
WARNING
!
FIRE, INJURY, OR DEATH HAZARD
Failure to follow this warning could result in personal injury, death
and/or property damage.
The ability to properly perform maintenance on this equipment requires
certain knowledge, mechanical skills, tools, and equipment. If you do
not possess these, do not attempt to perform any maintenance on this
equipment other than those procedures recommended in the User’s
Manual.
