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32 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Operation
Notes: This schedule is for units operating at normal altitudes of 2000 ft. (610m) or less. SPECIAL ORIFICES ARE
REQUIRED FOR INSTALLATIONS ABOVE 2,000 FT. (610M).
Notes: When installed in Canada, any references to deration at altitudes in excess of 2000 feet (610m) are to be
ignored. At altitudes of 2000 to 4500 feet (610 to 1372m), the unit heaters must be orificed to 90% of
the normal altitude rating, and be so marked in accordance with the CSA certification.
Table 6. Main burner orifice schedule
Input in 1000 BTU
Type of Gas Natural Propane
Number of
Burner
Orifices
Heating Value
1075 BTU/Ft3
(40.1 MJ/m3)
2500 BTU/Ft3
(93.1 MJ/m3)
Manifold Pressure
3.5" W.C.
(0.87kPA)
10" W.C.
(2.49 kPA)
30 FT 3/HR
ORIFICE DRILL
28
49
12
57
2
45 FT 3/HR
ORIFICE DRILL
42
49
16
57
3
60 FT 3/HR
ORIFICE DRILL
56
49
24
57
4
75 FT 3/HR
ORIFICE DRILL
70
49
30
57
5
100 FT 3/HR
ORIFICE DRILL
96
42
40
54
4
125 FT 3/HR
ORIFICE DRILL
120
42
50
54
5
150 FT 3/HR
ORIFICE DRILL
140
42
60
54
6
175 FT 3/HR
ORIFICE DRILL
163
42
70
54
7
200 FT 3/HR
ORIFICE DRILL
186
42
80
54
8
225 FT 3/HR
ORIFICE DRILL
210
42
90
54
9
250 FT 3/HR
ORIFICE DRILL
233
42
100
54
10
300 FT 3/HR
ORIFICE DRILL
280
42
120
54
12
350 FT 3/HR
ORIFICE DRILL
326
42
140
54
14
400 FT 3/HR
ORIFICE DRILL
372
42
160
54
16