46
BLOWER SPEED SELECTIONS
The UT Electronic Controls control boards have four quick con-
nect terminals for connecting the motor speed leads. These are:
1. FAN SPEED* — motor runs on this speed when the thermo-
stat is in the “FAN” position.
2. COOL — connect desired cooling speed.
3. HEAT — connect desired heating speed.
4. HEAT/COOL* — connect desired speed when heating and
cooling speed are the same.
5. If heating and continuous speed are the same, jump across
“FAN” and “HEAT” terminals.
See Table 10 for instructions for setting the blower “OFF” timings.
GAS FURNACE (DIRECT DRIVE)
INSTRUCTIONS FOR CHANGING
BLOWER SPEED
The blower motor is wired for blower speeds required for normal
operation as shown.
If additional blower speed taps are available (leads connected to
“M1” and “M2” on the electronic control), speeds may be changed
if necessary to fit requirements of the particular installation. Re-
connect the unused motor leads to “M1” or “M2.” Check motor
lead color for speed designation.
Heating speeds should not be reduced where it could cause the
furnace air temperature to rise to exceed the maximum outlet air
temperature specified for the unit.
!
CAUTION
DO NOT CONNECT ANY MOTOR SPEEDS TO “HEAT” OR
“COOL” IF YOU USE THE “HEAT/COOL” TERMINAL. DOING
SO WILL DAMAGE THE BLOWER MOTOR. UNUSED
MOTOR WIRE TAPS MUST BE CONNECTED TO PARKING
TERMINALS M1 AND M2 OF THE IFC, OR PROPERLY IN-
SULATED.
!
WARNING
DISCONNECT THE ELECTRICAL SUPPLY TO THE FUR-
NACE BEFORE ATTEMPTING TO CHANGE THE BLOWER
SPEED. FAILURE TO DO SO CAN CAUSE ELECTRICAL
SHOCK RESULTING IN SEVERE PERSONAL INJURY OR
DEATH.
Low 823 803 787 732 718 691 651 593
Med. Lo 1030 1018 1006 976 929 897 850 808
Med. Hi 1129 1132 1112 1087 1054 1028 971 919
High 1361 1353 1331 1297 1264 1232 1164 1117
Low 1229 1200 1181 1155 1120 1078 1013 970
Med. Lo 1308 1267 1266 1233 1204 1176 1113 1062
Med. Hi 1553 1542 1516 1491 1451 1417 1358 1306
High 1969 1924 1893 1840 1803 1728 1657 1570
Low 1209 1182 1131 1112 1051 976 929 867
Med. Lo 1438 1420 1386 1350 1320 1293 1248 1186
Med. Hi 1902 1883 1844 1817 1753 1700 1636 1547
High 2071 2037 2001 1962 1905 1856 1807 1709
Low 1358 1354 1331 13091 1250 1224 1154 1089
Med. Lo 1541 1517 1476 1453 1416 1371 1339 1277
Med. Hi 1799 1774 1746 1712 1691 1629 1554 1495
High 2015 1989 1929 1902 1862 1815 1742 1665
Low 1411 1395 1370 1334 1310 1252 1220 1150
Med. Lo 1606 1579 1569 1537 1499 1468 1407 1346
Med. Hi 1889 1891 1849 1828 1764 1717 1659 1609
High 2178 2160 2105 2067 2024 1976 1916 1832
TABLE 12
AIR FLOW PERFORMANCE – (-)801S/(-)801P & (-)(-)80MSS/(-)(-)80MSP SERIES MODELS
Model
Motor HP
Blower Size,
IN.
CFM Air Delivery
External Static Pressure, ” W.C.
Speed Tap
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
(-)801SA050314MSA
(-)801PA050314MSA
(-)(-)80MSS050A30A
(-)(-)80MSP050A30A
1/3
11 x 6
(-)801SA075417MSA
(-)801PA075417MSA
(-)(-)80MSS075B30A
(-)(-)80MSP075B30A
(-)801SA100521MSA
(-)801PA100521MSA
(-)(-)80MSS100C40A
(-)(-)80MSP100C40A
(-)801SA125524MSA
(-)801PA125524MSA
(-)(-)80MSS125D50A
(-)(-)80MSP125D50A
1/2
11 x 7
1/2
11 x 10
3/4
11 x 10
(-)801SA150524MSA
(-)801SA150524MSA
(-)(-)80MSS150D50A
(-)(-)80MSP150D50A
3/4
11 x 10
NOTE: Shaded data is factory heating tap.
Ai
rfl
ow
Summary of Contents for 801P SERIES
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