33
Cooling
4
and Heating Air Delivery -- CFM continued (Bottom Return
5
with Filter)
( S W 1 --- 5 a n d S W 4 --- 3 s e t t o O F F, e x c e p t a s i n d i c a t e d . S e e n o t e s 1 a n d 2 . )
Unit size:
120C24--- 22
Clg/CF Switch settings External Static Pressure (ESP)
Clg Switches S W 2 --- 3 S W 2 --- 2 S W 2 --- 1
Clg Default: OFF OFF OFF 1845 1840 1835 1835 1825 1820 1810 1800 1785 1775
CF Switches S W 3 --- 3 S W 3 --- 2 S W 3 --- 1
L o w --- C l g D e f a u l t : OFF OFF OFF 895 915 915 915 915 See note 4
Cooling Airflow (SW2)
Low--- Cooling Airflow
(SW3)
OFF OFF ON 715 725 720 710 705 See note 4
OFF ON OFF 895 915 915 915 915 See note 4
OFF ON ON 1070 1090 1105 1115 1115 1110 1115 1120 1120 1110
ON OFF OFF 1240 1265 1280 1295 1295 1305 1305 1305 1315 1315
ON OFF ON 1520 1520 1515 1505 1495 1490 1480 1465 1455 1445
ON ON OFF 1845 1840 1835 1835 1825 1820 1810 1800 1785 1775
ON ON ON 2150 2145 2140 2145 2135 2130 2115 2100 2065 1985
Maximum Clg Airflow
2
2150 2145 2140 2145 2135 2130 2115 2100 2065 1985
CF Switches S W 3 --- 3 S W 3 --- 2 S W 3 --- 1
Cont. Fan Default: OFF OFF OFF 895 915 915 915 915 See note 4
Continuous Fan Airflow
(SW3)
OFF OFF ON 715 725 720 710 705 See note 4
OFF ON OFF 805 820 815 810 810 See note 4
OFF ON ON 895 915 915 915 915 See note 4
ON OFF OFF 895 915 915 915 915 See note 4
ON OFF ON 895 915 915 915 915 See note 4
ON ON OFF 895 915 915 915 915 See note 4
ON ON ON 895 915 915 915 915 See note 4
Heating (SW1)
High Heat Airflow
3
1825 1820 1815 1800 1800 1795 1785 1775 1760 1745
Low Heat Airflow
3
1555 1555 1550 1550 1545 1525 1520 1505 1495 1485
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 to ON for nominal 370 CFM/ton (+7% airflow).
This applies to Cooling and Low-Cooling airflows, but does not affect continuous fan airflows.
The above adjustments in airflow are subject ot motor horsepower range/capacity
2. Maximum cooling airflow is achieved when switches SW2-1, SW2-2, SW2-3 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 rec-
ommended because 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.
GAS PIPING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Never purge a gas line into a combustion chamber. Never test
for gas leaks with an open flame. Use a commercially available
soap solution made specifically for the detection of leaks to
check all connections. A fire or explosion may result causing
property damage, personal injury or loss of life.
!
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Use proper length of pipe to avoid stress on gas control
manifold and gas valve.
!
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Gas valve inlet and/or inlet pipe must remain capped until
gas supply line is permanently installed to protect the valve
from moisture and debris. Also, install a sediment trap in the
gas supply piping at the inlet to the gas valve.
!
WARNING
Gas piping must be installed in accordance with national and local
codes. Refer to current edition of NFGC in the U.S.A. Refer to
current edition of NSCNGPIC in Canada.
Installations must be made in accordance with all authorities
having jurisdiction. If possible, the gas supply line should be a
separate line running directly from meter to furnace.
NOTE: Use a back-- up wrench on the inlet of the gas valve when
connecting the gas line to the gas valve.
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