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5132210-UIM-H-0916
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could result in serious
injury, death or property damage.
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.
6. The furnace and its equipment shutoff valve must be disconnected
from the gas supply system during and pressure testing of that sys-
tem at test pressures in excess of 1/2 psi (3.48 kPA)
Table 9: High Altitude Gas Orifice Sizing
GAS TYPE
NATURAL GAS ORIFICE SIZES
LP GAS
ORIFICE SIZES
FLUE VENT AND AIR INTAKE HOOD
The flue vent hood and air intake hoods are shipped loose. These hoods
must be installed to assure proper unit operation. The hoods must be fas-
tened to the outside of the side gas control/electrical compartment with
the screws provided. See Figure 8.
WARNING
!
Flue hood surfaces may be hot.
Table 10: Natural Gas Application Data
Available On Models
2, 2-1/2 Tons
3, 3-1/2, 4, 5 Tons
2, 2-1/2 Tons
3, 3-1/2, 4, 5 Tons
4, 5 Tons
1. Heating capacity valid for elevations up to 2000 feet above sea level. For elevations above 2,000 feet, rated capacity should be reduced by 4% for each 1,000 feet
above sea level.
3
2. Based on 1075 BTU/Ft.
.
3. The air flow must be adequate to obtain a temperature rise within the range shown. Continuous return air temperature should not be below 55°F.
10
ELEVATION ABOVE SEA LEVEL (FEET)
0-2000 (FACTORY) 2001-3000 3001-4000 4001-5000 5001-6000 6001-7000 7001-8000 8001-9000 9001-10000
36
37
42
42
51
51
54
54
1
Output (MBH)
Input (MBH)
High Fire
High Fire
50
65
75
100
125
7. The furnace must be isolated from the gas supply piping system by
closing its individual manual shut-off valve before conducting any
pressure testing of the gas supply piping system at test pressures
equal to or less than 1/2 psig (3.48 kPa).
HIGH ALITITUDE GAS CONVERSION
This furnace is constructed at the factory for natural gas-fired operation
at altitudes up to 2,000 feet above sea level. For installations located
above 2,000 feet, the gas input rate to the burners must be reduced by
4% per 1,000 feet above sea level. It may be necessary to change to
smaller orifices at high altitude. Refer to the table below for the correct
orifice size to use.
38
38
39
43
43
43
52
52
52
55
55
55
FIGURE 8: Flue Vent Outlet Air Hood
The flue exhaust hood must be properly installed and within the rec-
ommended clearances. Further communications and action must be
given to the home or building owner(s) to eliminate any unauthorized
human contact around this area during the heating cycle. Flue hood
surfaces and the immediate area reach high temperatures during the
heating cycle.
2
Gas Rate
3
Ft.
/Hr.
High Fire/Low Fire
41
46
53
60
61
70
81
93
101
116
40
41
41
44
44
45
52
53
53
55
55
56
AIR INTAKE HOOD
AIR INTAKE SCREEN
EXHAUST HOOD
CAUTION
!
Number of
Burners
Min.
2
2
3
3
4
Johnson Controls Unitary Products
42
46
53
56
A0284-001
Temp. Rise ºF
3
At Full Input
Max.
40
70
40
70
40
70
40
70
40
70
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