26
440 01 4801 00
Specifications subject to change without notice.
Unit Size:
1202422A
Clg/CF Switch settings
External Static Pressure (ESP)
Clg Switches:
SW2---8
SW2---7
SW2---6
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
2060 2015 1975 1930 1885 1840 1790 1750 1705 1630
Cooling (SW2---8,7,6)
OFF
OFF
ON
865
775
690
595
505
425
See Note 4
OFF
ON
OFF
1080 1005
935
860
785
705
625
555
490
425
OFF
ON
ON
1285 1220 1150 1085 1020
960
895
820
750
690
ON
OFF
OFF
1465 1410 1350 1285 1230 1175 1115 1060 1000
935
ON
OFF
ON
1685 1635 1585 1530 1475 1420 1375 1325 1270 1225
ON
ON
OFF
2060 2015 1975 1930 1885 1840 1790 1750 1705 1630
ON
ON
ON
2265 2225 2180 2145 2100 2060 2010 1895 1770 1645
Maximum Clg Airflow
2
2320 2310 2270 2230 2190 2135 2020 1895 1770 1645
CF Switches
SW2---5
SW2---4
SW2---3
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Low---Clg Default:
OFF
OFF
OFF
865
775
690
595
505
425
See Note 4
Low---Cooling
(SW2---5,4,3)
OFF
OFF
ON
585
470
See Note 4
OFF
ON
OFF
865
775
690
595
505
425
See Note 4
OFF
ON
ON
1080 1005
935
860
785
705
625
555
490
425
ON
OFF
OFF
1285 1220 1150 1085 1020
960
895
820
750
690
ON
OFF
ON
1465 1410 1350 1285 1230 1175 1115 1060 1000
935
ON
ON
OFF
1685 1635 1585 1530 1475 1420 1375 1325 1270 1225
ON
ON
ON
2060 2015 1975 1930 1885 1840 1790 1750 1705 1630
Cont. Fan Default:
OFF
OFF
OFF
865
775
690
595
505
425
See Note 4
Continuous Fan
(SW2---5,4,3)
OFF
OFF
ON
585
470
See Note 4
OFF
ON
OFF
730
630
See Note 4
OFF
ON
ON
865
775
690
595
505
425
See Note 4
ON
OFF
OFF
865
775
690
595
505
425
See Note 4
ON
OFF
ON
865
775
690
595
505
425
See Note 4
ON
ON
OFF
865
775
690
595
505
425
See Note 4
ON
ON
ON
865
775
690
595
505
425
See Note 4
Heating (SW1)
High Heat Airflow
3
2165 2120 2075 2030 1985 1940 1895 1850 1770 1645
Low Heat Airflow
3
1675 1625 1575 1525 1475 1425 1375 1325 1275 1225
NOTE
: See notes at end of table.
Table 9
--
Cooling
4
and Heating Air Delivery -- CFM (Bottom Return
5
with Filter) -- NOTES
1. Nominal 350 CFM/ton cooling airflow is delivered with SW1---5 and SW2---2 set to OFF.
Set both SW1---5 and SW2---2 to ON for +7% airflow (nominal 370CFM/ton).
Set SW1---5 to ON and SW2---2 to OFF for +15% airflow (nominal 400CFM/ton)
Set SW1---5 to OFF and SW2---2 to ON for ---7% airflow (nominal 325 CFM/ton)
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. Max cooling airflow is achieved when switches SW2---6, SW2---7, SW2---8 and SW1---5 are set to ON, and SW2---2 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 be-
cause high---heat operation will be above 1.0 ESP.
5. All airflows on 21” (533 mm) casing size furnaces are 5% less on side---return only installations.
6. Side returns for 24.5” (622 mm) casing sizes 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 side return or excessive watt draw may result. A minimum filter size of
20x25” (508 x 635 mm) is required.
AIR DUCTS
Many states, provinces and localities are considering or have
implemented standards and/or restrictions on duct sizing
practices, ductwork leakage, and/or ductwork thermal, airflow
and electrical efficiencies. CONSULT LOCAL CODE
OFFICIALS
for
ductwork
design
and
performance
requirements in your area.
NOTICE
General Requirements
The duct system should be designed and sized according to
accepted national standards such as those published by: Air
Conditioning Contractors Association (ACCA Manual D), Sheet
Metal and Air Conditioning Contractors National Association
(SMACNA) or American Society of Heating, Refrigerating and
Air Conditioning Engineers (ASHRAE) or consult
The Air
Systems Design Guidelines
reference tables available from your
local distributor. The duct system should be sized to handle the
required system design CFM at the design external static pressure.
The furnace airflow rates are provided in Table 9--Air
Delivery--CFM (With Filter). When a furnace is installed so that
the supply ducts carry air circulated by the furnace to areas outside
the space containing the furnace, the return air shall also be
handled by duct(s) sealed to the furnace casing and terminating
outside the space containing the furnace.
Secure ductwork with proper fasteners for type of ductwork used.
Seal supply-- and return--duct connections to furnace with code
approved tape or duct sealer.
NOTE
: Flexible connections should be used between ductwork
and furnace to prevent transmission of vibration.
Ductwork passing through unconditioned space should be
insulated to enhance system performance. When air conditioning is
used, a vapor barrier is recommended.
Maintain a 1--in. (25 mm) clearance from combustible materials to
supply air ductwork for a distance of 36--in. (914 mm) horizontally