35
Tabl e 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 SW4 ---3 set to OFF.
Set both SW1---5 to ON for nominal 400CFM/ton ( +15% airflow)
S e t S W 4 --- 3 t o O N f o r n o m i n a l 3 2 5 C F M / t o n ( --- 7% a ir f l o w )
Set both SW1---5 a nd SW4---3 to ON for nominal 370CFM/ton ( +7% airflow)
The above adjustments in airflow are subject to motor horsepower ran ge/capacity
This applies to Cooling and Low--- Cooling airflow, but does not affect continuous fan airflow.
2 . M a x im u m c o o l in g a ir f l o w i s a c h i e v e d w h e n s w itc h e s S W 2 --- 6 , S W 2 --- 7 , S W 2 --- 8 a n d S W 1 --- 5 a r e s e t t o O N , a n d S W4 --- 3 i s s e t t o O F F.
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 furn a ces are 5% less on side---retu rn onl y installations.
6. Side retur ns f or 24.5” (622 mm) casing sizes require two sides, or a side and bottom to a llow sufficient a irfl ow at the r etu rn of the fu rnace.
7. Airflows over 1800 CFM require bottom retu r n, two---side r e tu r n, or bottom an d side return or excessive watt draw may resul t. A minimum filter size of
20x25” (508 x 635 mm) is required.
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 USA. 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.
In the state of Massachusetts:
1. Gas supply connections MUST be performed by a licensed
plumber or gas fitter.
2. When flexible connectors are used, the maximum length
shall not exceed 36 in. (915 mm).
3. When lever handle type manual equipment shutoff valves
are used, they shall be T -- handle valves.
4. The use of copper tubing for gas piping is NOT approved
by the state of Massachusetts.
NOTICE
Refer to Table 10 for recommended gas pipe sizing. Risers must be
used to connect to furnace and to meter. Support all gas piping
with appropriate straps, hangers, etc. Use a minimum of one hanger
every 6 ft. (2 M). Joint compound (pipe dope) should be applied
sparingly and only to male threads of joints. Pipe dope must be
resistant to the action of propane gas.
Table 10 – Maximum Capacity of Pipe
NOMINAL
IRON PIPE
SIZE
IN. (MM)
LENGTH OF PIPE --- FT (M)
10
(3.0)
20
(6.0)
30
(9.1)
40
(12.1)
50
(15.2)
1/2 (13) 175 120 97 82 73
3/4 (19) 360 250 200 170 151
1 ( 25) 680 465 375 320 285
1-1/4 (32) 1400 950 770 660 580
1-1/2 (39) 2100 1460 1180 990 900
* Cubic ft of gas per hr for gas pressures of 0.5 psig (14--- In. W.C.) or less and
a pressure drop of 0.5--- In. W .C. (based on a 0.60 specific gravity gas). Ref:
Table 10 above and 6.2 of current edition of NFPA54/ANSI Z223.1.
FIRE OR EXPLOSION HAZARD
A failure to follow this warning could result in personal
injury, death, and/or property damage.
If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do not use a
connector which has previously served another gas
appliance. Black iron pipe shall be installed at the furnace
gas control valve and extend a minimum of 2--in. (51 mm)
outside the furnace.
!
WARNING
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