20
3.5
3.5
3.3
3.2
3.2
3.2
3.1
3.1
3.0
3.0
2.9
2.9
2.8
2.8
2.7
2.7
2.6
948
931
914
897
881
865
849
833
818
802
787
771
756
741
726
711
696
TUBULAR UNIT HEATER
HIGH ALTITUDE DERATION
This Tubular Unit Heater has been manufactured utilizing
standard burner orifices and a normal manifold pressure
setting as per the specifications shown on your unit
rating plate.
All unit deration must be done through field adjustments
by a qualified technician. Once the proper adjustments
are made in the field, attach label #J17-06459 to the
unit, and record adjusted manifold pressure, altitude of
the unit installation and the technician’s name and date
on the label using a permanent marker.
Refer to Installation Instruction section on Adjustments-
Gas Input Rate for adjusting the manifold pressure.
Manifold
Pressure
(In. W.C.)
PROPANE (LP) GAS
NATURAL GAS
Heating*
Value
BTU/Cu. ft.
Altitude
(Feet)
8.6
8.5
8.4
8.4
8.3
8.2
8.1
8.0
7.9
7.7
7.6
7.5
7.4
7.2
7.1
6.9
6.8
2,000
2,500
3,000
3,500
4,000
4,500
5,000
5,500
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
*Notes:
1. Consult local utility for actual heating value.
2. Tables based on heating value of 1,050 BTU/Cu. ft. at sea level.
2,278
2,237
2,196
2,156
2,116
2,077
2,039
2,000
1,964
1,927
1,891
1,853
1,817
1,781
1,745
1,709
1,673
Table 5A
Manifold
Pressure
(In. W.C.)
Heating*
Value
BTU/Cu. ft.
