48VL-C, 48VL-E: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
16
2. Turn plastic adjustment screw clockwise to increase gas input, or
turn plastic adjustment screw counterclockwise to decrease input
(See Fig. 13). Manifold pressure must be between 3.2 and 3.8 IN.
WC.
3. Replace regulator cover screw on gas valve (See Fig. 13).
4. Turn off gas supply to unit. Remove manometer from pressure tap
and replace pipe plug on gas valve. (See Fig. 11.) 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. 23) 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. 12). Refer to the
Maintenance section for information on burner removal.
WARNING
!
FIRE AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury or death
and/or property damage.
Unsafe operation of the unit may result if manifold pressure is outside
this range.
Table 4 – High Altitude Compensation, Natural Gas - Single Phase Models
Nameplate
Input (Btu/hr)
Rated Heating Input (Btu/hr), Natural Gas at Installation Altitude Above Sea Level, U.S.A.
*
*. In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above sea level.
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or dealer.
For Canadian Installations from 2000 to 4500 ft (610-1372 m), use U.S.A. column 2001 to 3000 ft (611 to 914 m).
0 to 2000 ft
(0-610 m)
2001 to 3000 ft*
(611 to 914 m)
3001 to 4000 ft
(915 to 1219 m)
4001 to 5000 ft
(1220 to 1524 m)
5001 to 6000 ft
(1524 to 1829 m)
40000 40000 36000 34400 32800 31200
60000 60000 54000 51600 49200 46800
90000 90000 81000 77400 73800 70200
115000 115000 103500 98900 94300 89700
127000 127000 114300 109200 104100 99100
Table 5 – High Altitude Compensation, Natural Gas - Three Phase
Nameplate
Input (Btu/hr)
Rated Heating Input (Btu/hr), Natural Gas at Installation Altitude Above Sea Level, U.S.A.
*
*. In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above sea level.
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or dealer.
For Canadian Installations from 2000 to 4500 ft (610-1372 m), use U.S.A. column 2001 to 3000 ft (611 to 914 m).
0 to 2000 ft
(0-610 m)
2001 to 3000 ft*
(611 to 914 m)
3001 to 4000 ft
(915 to 1219 m)
4001 to 5000 ft
(1220 to 1524 m)
5001 to 6000 ft
(1524 to 1829 m)
40000 40000 36000 34400 32800 31200
60000 60000 54000 51600 49200 46800
90000 90000 81000 77400 73800 70200
115000 115000 103500 98900 94300 89700
130000 130000 117000 111800 106600 101400
Table 6 – Heating Inputs
HEATING INPUT
(BTUH)
NUMBER OF
ORIFICES
GAS SUPPLY PRESSURE (IN. W.C.)
MANIFOLD PRESSURE
(IN. W.C.)
Natural
*
*. Based on altitudes from sea level to 2000 ft (610 m) above sea level. In 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.
Propane
*†
†. When a unit is converted to propane, different size orifices must be used. See separate, natural-to-propane conversion kit instructions.
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 3 4.0 13.0 11.0 13.0 3.2~3.8 10.0~11.0
90,000 3 4.5 13.0 11.0 13.0 3.2~3.8 10.0~11.0
115,000 3 4.5 13.0 11.0 13.0 3.2~3.8 10.0~11.0
130,000 3 4.5 13.0 11.0 13.0 3.2~3.8 10.0~11.0
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