Sterling SF - Manual (Page 21)

21
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 orifi ces and a normal manifold pressure
setting as per the specifi cations shown on your unit rating
plate.
All unit deration must be done through fi eld adjustments
by a qualifi ed technician. Once the proper adjustments
are made in the fi eld, 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/Hr.
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 Natural Gas heating value of 1,050 BTU/Hr. at sea
level and Propane (LP) Gas heating value of 2,500 BTU/Hr. at sea
level.
3. For installations in Canada at altitudes of 2,000-4,500 ft.: adjust the
manifold pressure to 2.8 in. W.C. for Natural Gas and 8.1 in. W.C. for
Propane (LP) Gas.
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 6A
Manifold*
Pressure
(In. W.C.)
Heating*
Value
BTU/Hr.
OPERATION (continued)