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5594752-UIM-B-0419
Table 13: Blower Performance CFM - Any Position (without filter) (Continued)
Models
100C16
100C20
120C16
120C20
130D20
NOTES:
1. Airflow expressed in standard cubic feet per minute (SCFM).
2. Motor voltage at 115 V.
3. Not all speeds are recommended for use as heating speeds.
SECTION VIII: SAFETY CONTROLS
CONTROL CIRCUIT FUSE
A 3-amp fuse is provided on the control circuit board to protect the 24-
volt 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
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.
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 properly positioned.
22
Speed
0.1
High
1795
Medium High
1464
Medium
1217
Medium Low
1062
Low
905
High
2219
Medium High
1994
Medium
1727
Medium Low
1618
Low
1410
High
1765
Medium High
1429
Medium
1207
Medium Low
1055
Low
885
High
2235
Medium High
1960
Medium
1693
Medium Low
1580
Low
1417
High
2229
Medium High
2009
Medium
1818
Medium Low
1569
Low
1448
Airflow Data
Ext. Static Pressure (in. H2O)
0.2
0.3
0.4
1755
1715
1673
1417
1364
1325
1171
1120
1072
1011
956
910
847
784
732
2179
2136
2095
1951
1911
1872
1687
1648
1595
1574
1528
1480
1364
1316
1255
1721
1684
1635
1384
1340
1292
1169
1119
1077
1018
955
907
834
783
733
2199
2148
2108
1901
1860
1819
1640
1593
1557
1533
1488
1444
1362
1313
1269
2182
2133
2088
1968
1925
1881
1765
1729
1675
1520
1472
1427
1394
1341
1275
ROLLOUT SWITCH CONTROLS
These controls are mounted on the burner assembly. If the temperature
in the area surrounding the burner exceeds its set point, the gas valve
is de-energized. The operation of this control indicates a malfunction in
the combustion air blower, 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 SWITCHES
This furnace is supplied with a pressure switch, which monitors the flow
through the combustion air/vent piping system. This switch de-ener-
gizes the gas valve if any of the following conditions are present.
1. Blockage of vent piping or terminal.
2. Failure of combustion air blower motor.
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:
1. A dirty filter.
2. If the indoor fan motor should fail.
3. Too many supply or return registers closed or blocked off.
The control module will lockout if the limit trips 5 consecutive times. If
this occurs, control will reset & try ignition again after 1 hour.
1, 2
(SCFM)
0.5
0.6
0.7
1631
1587
1533
1290
1227
1188
1021
978
924
858
801
738
668
601
540
2044
2001
1952
1820
1774
1733
1558
1502
1456
1432
1383
1337
1206
1164
1109
1606
1542
1503
1256
1209
1164
1028
977
930
862
810
761
675
618
544
2066
2034
1984
1776
1723
1682
1504
1455
1413
1394
1342
1296
1223
1169
1120
2047
1996
1946
1829
1778
1737
1616
1580
1540
1376
1329
1281
1221
1183
1131
Johnson Controls Ducted Systems
0.8
1479
1138
869
669
465
1912
1678
1406
1288
1042
1442
1114
888
705
500
1932
1642
1365
1244
1079
1893
1679
1480
1237
1085
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