935CA: 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.
22
1.Nominal 350 CFM/ton cooling airflow is delivered with SW1-5 and SW4-3 set to OFF.
Set SW1-5 to ON for nominal 400 CFM/ton (+15% airflow).
Set SW4-3 to ON for nominal 325 CFM/ton (-7% airflow).
Set both SW1-5 and SW4-3 on ON for nominal 370 CFM/ton (+7% airflow).
The above adjustments in airflow are subject to motor horsepower range/capacity
This applies to Cooling and Low-Cooling airflow, but does not affect continuous fan airflow.
2.Maximum cooling airflow is achieved when switches SW2-3, SW2-2, SW2-1 and SW1-5 are set to ON, and SW4-3 is set to OFF.
3.All heating CFM's are when comfort/efficiency adjustment switch (SW1-4) is set to OFF
4.Ductwork must be sized for high-heating CFM within the operational range of ESP. Operation within the blank areas of the chart is not recommended because heat operation will be above
1.0 ESP.
5.All airflows on noted 21" (533 mm) casing size furnaces are 5% less on side return only installations.
6.Side returns for noted models, require two sides, or a side and bottom to allow sufficient airflow at the return of the furnace.
7.Airflows over 1800 CFM require bottom return, two-side return, or bottom and a side return or excessive watt draw may result. A minimum filter size of 20 x 25” (508 x 635 mm) is
required.
COOLING
4
AND HEATING AIR DELIVERY - CFM (Bottom Return With Filter)
(SW1-5 and SW4-3 set to OFF, except as indicated. See notes 1 and 2)
Unit Size:
30080C21
5
Clg/CF Switch settings
External Static Pressure (ESP)
Clg Switches:
SW2-3
SW2-2
SW2-1
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Clg Default:
OFF
OFF
OFF
1825
1830
1830
1825
1825
1825
1815
1810
1805
1785
CF Switches
SW3-3
SW3-2
SW3-1
Low-Clg Default:
OFF
OFF
ON
695
700
Note 4
Cooling
(SW2)
Low-Cooling
(SW3)
OFF
ON
OFF
870
885
880
880
Note 4
OFF
ON
ON
1045
1060
1070
1070
1070
1070
Note 4
ON
OFF
OFF
1310
1315
1315
1315
1310
1300
1290
1280
Note 4
ON
OFF
ON
1470
1475
1480
1480
1480
1475
1465
1460
1450
1440
ON
ON
OFF
1825
1830
1830
1825
1825
1825
1815
1810
1805
1785
ON
ON
ON
2170
2180
2180
2175
2170
2150
2080
1995
1915
1825
Maximum Clg Airflow
2
2230
2225
2235
2230
2195
2165
2110
2020
1935
1845
CF Switches
SW3-3
SW3-2
SW3-1
Cont. Fan Default:
OFF
OFF
OFF
695
700
Note 4
Continuous Fan
(SW3)
OFF
OFF
ON
695
700
Note 4
OFF
ON
OFF
870
885
880
880
Note 4
OFF
ON
ON
870
885
880
880
Note 4
ON
OFF
OFF
870
885
880
880
Note 4
ON
OFF
ON
870
885
880
880
Note 4
ON
ON
OFF
870
885
880
880
Note 4
ON
ON
ON
870
885
880
880
Note 4
Heating (SW1)
Heat Airflow
3
1425
1430
1435
1435
1435
1425
1420
1410
1400
1390
Unit Size:
66100C21
6
Clg/CF Switch settings
External Static Pressure (ESP)
Clg Switches:
SW2-3
SW2-2
SW2-1
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Clg Default:
OFF
OFF
OFF
1765
1775
1790
1805
1810
1820
1820
1820
1820
1820
CF Switches
SW3-3
SW3-2
SW3-1
Cooling
(SW2)
Low-Cooling
(SW3)
OFF
OFF
ON
630
Note 4
OFF
ON
OFF
805
830
Note 4
OFF
ON
ON
1065
1075
1080
1085
Note 4
ON
OFF
OFF
1240
1250
1265
1270
1270
Note 4
ON
OFF
ON
1410
1415
1435
1445
1450
1455
1460
Note 4
ON
ON
OFF
1765
1775
1790
1805
1810
1820
1820
1820
1820
1820
ON
ON
ON
2115
2115
2125
2140
2145
2150
2145
2140
2080
1985
Maximum Clg Airflow
2
2165
2185
2200
2215
2225
2240
2250
2210
2120
2030
CF Switches
SW3-3
SW3-2
SW3-1
Cont. Fan Default:
OFF
OFF
OFF
630
Note 4
Continuous Fan
(SW3)
OFF
OFF
ON
630
Note 4
OFF
ON
OFF
805
830
Note 4
OFF
ON
ON
1020
1040
1050
Note 4
ON
OFF
OFF
1020
1040
1050
Note 4
ON
OFF
ON
1020
1040
1050
Note 4
ON
ON
OFF
1020
1040
1050
Note 4
ON
ON
ON
1020
1040
1050
Note 4
Heating (SW1)
Heat Airflow
3
1790
1800
1815
1830
1835
1845
1850
1850
1855
1855
Table 11 – Air Delivery - CFM (With Filter) (Continued)