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915SB: 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.
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• Increase blower speed to reduce temperature rise.
• Decrease blower speed to increase temperature rise.
Change the blower heat taps as required to maintain proper temperature
rise for Heating and Cooling as described above. To change blower
motor speed selections for heating mode, remove blower motor lead
from control HEAT terminal. See
. Select desired blower motor
speed lead from one of the other motor leads and relocate it/them to
HEAT (heating blower tap) terminal(s). Reconnect original lead on
SPARE terminal.
Adjust Blower Off Delay (Heat Mode)
If desired, the main blower off time delay period may be lengthened or
shortened when operating in the heating mode to provide greater
comfort. For position and location of jumpers on control center, see
.
Table 19 – Blower Off Delay Jumper Positions
The blower off delay has four adjustable settings from 90 sec to 180 sec.
See
. The blower off delay jumpers are located on the furnace
control See
and
. To change the blower off delay setting,
move the jumper from one set of pins on the control to the pins used for
the desired blower off delay. Factory blower off delay setting is 120 sec.
WARNING
!
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or death.
Disconnect 115vac electrical power before changing speed tap.
(Read following caution before changing taps).
CAUTION
!
UNIT DAMAGE HAZARD
To avoid operating outside the rise range and avoid component damage:
Refer to the Air Delivery Tables to determine which airflows and
settings are allowed for proper heating airflow. DO NOT use the
highlighted settings for Heating airflow. The highlighted settings are to
be used for Cooling and Continuous Fan ONLY.
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Reinstall manifold pressure tap plug in gas valve to prevent gas leak.
CAUTION
!
FURNACE OVERHEATING HAZARD
Failure to follow this caution may result in reduced furnace life.
Recheck temperature rise. It must be within limits specified on the
rating plate. Recommended operation is at the mid-point of rise range
or slightly above.
PINS
1 AND 2
2 AND 3
3 AND 4
4 AND 5
Time (in sec.)
90
120
150
180
Table 20 – Air Delivery - CFM (With Filter)
UNIT SIZE
WIRE LEAD
COLOR
SPEED
TAPS
2, 3
(Function)
EXTERNAL STATIC PRESSURE (IN.W.C.)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
30026E14
Black
Cooling. Do not use for heating
1045 1010
975
935
895
855
810
760
715
670
Yellow
Alt Cooling or alt Heating
820
770
730
680
630
585
530
480
435
385
Orange
Alt Cooling or alt Heating
655
600
550
495
435
385
335
265
-
-
Blue
7
Heating or alt Cooling
605
545
490
435
375
335
255
-
-
-
Red
7
Alt Cooling. Do not use for heating
480
415
360
305
235
-
-
-
-
-
30040E14
Gray
Cooling. Do not use for heating
1050 1025 1000
975
950
920
895
870
845
820
Yellow
Alt Cooling. Do not use for heating
920
890
860
830
805
775
745
715
690
660
Orange
Alt Cooling or alt Heating
735
700
665
630
595
555
525
490
450
415
Blue
Heating or alt Cooling
695
660
625
590
555
515
480
445
405
370
Red
7
Alt Cooling. Do not use for heating
540
495
455
410
365
320
280
235
-
-
36040E17
Gray
Cooling. Do not use for heating
1180 1140 1100 1055 1010
960
915
860
805
735
Yellow
Alt Cooling. Do not use for heating
880
845
810
780
745
710
675
640
600
570
Blue
Heating or alt Cooling
650
610
560
515
470
435
395
360
325
265
Orange
7
Alt Cooling. Do not use for heating
525
460
405
350
320
275
210
-
-
-
Red
7
Alt Cooling. Do not use for heating
515
420
350
310
270
205
-
-
-
-
36060E14
Gray
Cooling. Do not use for heating
1225 1200 1175 1145 1120 1095 1065 1040 1015
990
Yellow
Alt Cooling. Do not use for heating
1105 1080 1050 1020
990
965
935
905
880
850
Blue
Heating or alt Cooling
940
910
875
845
810
775
745
710
680
645
Orange
Alt Cooling or alt Heating
725
690
650
610
570
530
490
445
405
365
Red
7
Alt Cooling. Do not use for heating
545
495
445
395
345
295
245
-
-
-
42060E17
Gray
Cooling. Do not use for heating
1475 1445 1405 1370 1330 1290 1255 1215 1175 1140
Yellow
Alt Cooling or alt Heating
1230 1190 1155 1120 1085 1050 1005
970
925
885
Orange
Alt Cooling or alt Heating
1070 1030
990
950
920
875
840
800
755
715
Blue
Heating or alt Cooling
1020
975
940
900
860
820
775
740
690
650
Red
Alt Cooling. Do not use for heating
700
590
535
485
460
390
340
300
275
210
48080E17
Gray
5, 6
Cooling. Do not use for heating
1820 1790 1755 1710 1665 1620 1570 1525 1480 1435
Yellow
Alt Cooling or alt Heating
1455 1420 1380 1345 1310 1275 1240 1205 1170 1135
Blue
Heating or alt Cooling
1335 1295 1260 1220 1185 1150 1110 1075 1040 1005
Orange
Alt Cooling or alt Heating
1110 1065 1020
980
935
895
850
810
770
725
Red
7
Alt Cooling. Do not use for heating
425
335
240
-
-
-
-
-
-
-