507769C05Page 46 of 55
Blower Speeds
Follow the steps below to change the blower speeds.
1. Turn o electrical power to furnace.
2. Remove blower compartment access panel.
3. Disconnect existing speed tap at control board speed
terminal.
NOTE: Termination of any unused motor leads must
be insulated.
4. Place unused blower speed tap on integrated control
“PARK” terminal or insulate.
5. Refer to blower speed selection chart on unit wiring
diagram for desired heating or cooling speed. See
Blower performance data beginning on the next page.
See Table 21 for allowable heating speeds.
6. Connect selected speed tap at control board speed
terminal.
7. Re-secure blower access panel.
8. Turn on electrical power to furnace.
9. Recheck temperature rise.
Electronic Ignition
The integrated control has an added feature of an internal
Watchguard control. The feature serves as an automatic
reset device for integrated control lockout caused by
ignition failure. This type of lockout is usually due to low
gas line pressure. After one hour of continuous thermostat
demand for heat, the Watchguard will break and remake
thermostat demand to the furnace and automatically reset
the integrated control to begin the ignition sequence.
Blower Performance Data
MGD96SE045B3XA Performance (Less Filter)
External
Static
Pressure
in. w.c.
Air Volume / Watts at Dierent Blower Speeds
High Medium-High Medium Medium-Low Low
cfm watts cfm watts cfm watts cfm watts cfm watts
0.00 1455 370 1275 255 1175 190 920 90 865 85
0.10 1425 375 1250 260 1145 200 885 100 830 90
0.20 1395 380 1225 265 1115 210 850 110 795 95
0.30 1365 385 1195 275 1085 220 815 115 750 105
0.40 1325 385 1170 290 1045 230 770 130 700 110
0.50 1245 370 1130 300 1010 240 720 135 660 120
0.60 1180 360 1095 305 970 245 675 140 605 125
0.70 1100 330 1045 310 935 255 615 150 560 130
0.80 980 295 1000 290 895 260 580 155 505 135
MGD96SE070B4XA Performance (Less Filter)
External
Static
Pressure
in. w.c.
Air Volume / Watts at Dierent Blower Speeds
High Medium-High Medium Medium-Low Low
cfm watts cfm watts cfm watts cfm watts cfm watts
0.00 1720 510 1545 355 1340 235 1240 190 1020 95
0.10 1700 530 1505 360 1310 245 1195 200 955 110
0.20 1675 545 1465 370 1275 255 1155 205 895 115
0.30 1640 555 1420 380 1230 270 1120 215 835 125
0.40 1600 565 1380 395 1180 280 1060 225 785 135
0.50 1560 570 1340 400 1140 290 1015 235 715 145
0.60 1500 565 1300 420 1095 305 965 245 640 150
0.70 1405 540 1255 430 1040 315 910 255 585 160
0.80 1325 515 1215 445 990 320 865 265 525 170
NOTE: All air data is measured external to unit without lter (not furnished - eld provided)
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