5894307-UIM-B-0920
28
Johnson Controls Ducted Systems
Notes:
Airflow expressed in standard cubic feet per minute (SCFM).
Motor voltage at 115 V.
SECTION IX: SAFETY CONTROLS
CONTROL CIRCUIT FUSE
A 3-A fuse is provided on the control circuit board to protect the 24-V
transformer from overload caused by control circuit wiring errors. This is
an ATO 3, automotive type fuse and is located on the control board.
BLOWER DOOR SAFETY SWITCH
This unit is equipped with an electrical interlock switch mounted in the
burner compartment. This switch interrupts all power at the unit when
the panel covering the blower compartment is removed.
Electrical supply to this unit is dependent upon the panel that covers the
blower compartment being in place and correctly positioned.
AUXILIARY LIMIT SWITCH
These controls are mounted on the burner assembly. If the temperature
in the area surrounding burner exceeds its setpoint, the gas valve is de-
energized. The operation of this control indicates a malfunction in the
combustion air blower or heat exchanger or a blocked vent pipe con-
nection. Corrective action is required. These are manual reset controls
that must be reset before operation can continue.
PRESSURE SENSOR
This furnace is supplied with a pressure sensor, which monitors the flow
through the combustion air/vent piping and condensate drain system.
LIMIT CONTROLS
There is a high temperature limit control located on the furnace vesti-
bule panel near the gas valve. This is an automatic reset control that
provides over temperature protection due to reduced airflow. This may
be caused by the following:
• A dirty filter
• Indoor fan motor failure
• Too many supply or return registers closed or blocked off
The control module locks out if the limit trips five consecutive times. If
this occurs, the control resets and attempts ignition again after 1 h.
Table 15:
Blower Performance CFM - Any Position (Without Filter)
Models
Speed
Airflow Data
(SCFM)
External Static Pressure (in. H
2
O)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
TL9E060B12
High
1319
1287
1265
1232
1204
1171
1134
1098
Medium High
1128
1100
1073
1039
997
958
919
871
Medium
952
918
882
846
801
762
717
681
Medium Low
771
734
694
643
601
559
513
461
Low
710
675
632
584
540
491
445
397
TL9E080C16
High
1745
1711
1679
1642
1607
1569
1529
1486
Medium High
1569
1527
1493
1458
1422
1380
1342
1299
Medium
1355
1324
1285
1247
1209
1177
1133
1083
Medium Low
1132
1090
1053
1011
977
923
887
825
Low
968
925
875
832
790
722
650
607
TL9E100C20
High
2171
2123
2092
2038
1995
1944
1893
1853
Medium High
1815
1766
1721
1676
1632
1583
1535
1499
Medium
1596
1555
1501
1453
1412
1384
1335
1288
Medium Low
1377
1316
1276
1223
1170
1131
1076
1029
Low
1256
1204
1149
1102
1058
1008
953
856
CAUTION
Main power to the unit must still be interrupted at the main power dis-
connect switch before any service or repair work is to be done to the
unit. Do not rely upon the interlock switch as a main power discon-
nect.
Blower and burner must never be operated without the blower panel
in place.
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