Carrier 48ES---A User Manual
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4. Turn off gas supply to unit. Remove manometer from
pressure tap and replace pipe plug on gas valve. (See Fig.
12.) Turn on gas to unit and check for leaks.
Measure Manifold Pressure (Propane Units)
Refer to propane kit installation instructions for properly checking
gas input.
NOTE: For installations below 2,000 ft (610 m), refer to the unit
rating plate for proper propane conversion kit. For installations
above 2,000 ft (610 m), contact your distributor for proper propane
conversion kit.
Check Burner Flame
With control access panel (see Fig. 20) removed, observe the unit
heating operation. Watch the burner flames to see if they are light
blue and soft in appearance, and that the flames are approximately
the same for each burner. Propane will have blue flame (See Fig.
13). Refer to the Maintenance section for information on burner
removal.
Table 4 – Heating Inputs
HEATING INPUT
(BTUH)
NUMBER OF
GAS SUPPLY PRESSURE (IN. W.C.)
MANIFOLD PRESSURE
NUMBER OF
ORIFICES
Natural{
Propane*{
MANIFOLD PRESSURE
(IN. W.C.)
ORIFICES
Min
Max
Min
Max
Natural{
Propane*†
40,000
2
4.0
13.0
11.0
13.0
3.2∼3.8
10.0∼11.0
60,000
2
4.0
13.0
11.0
13.0
3.2∼3.8
10.0∼11.0
90,000
3
4.0
13.0
11.0
13.0
3.2∼3.8
10.0∼11.0
115,000
3
4.0
13.0
11.0
13.0
3.2∼3.8
10.0∼11.0
130,000
3
4.0
13.0
11.0
13.0
3.2∼3.8
10.0∼11.0
*
When a unit is converted to propane, different size orifices must be used. See separate, natural---to---propane conversion kit instructions.
{
Based on altitudes from sea level to 2000 ft (610 m) above sea level. In the U.S.A. for altitudes above 2000 ft (610 m), reduce input rating 4 percent for each
additional 1000 ft (305 m) above sea level. In Canada, from 2000 ft (610 m) above sea level to 4500 ft (1372 m) above sea level, derate the unit 10 percent.
48E
S
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A