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CHECKING INPUT RATE
Figure 9
Major Gas and Electric Components
Table 5
Orifice Drill Sizes with Decimal Equivalents
Dia. Dia.
Drill Decimal Drill Decimal
Size Equivalent Size Equivalent
18 .1695 38 .1015
21 .1590 39 .0995
23 .1540 41 .0960
25 .1495 42 .0935
26 .1470 43 .0890
28 .1405 45 .0820
30 .1285 52 .0635
36 .1065
Main Burner Orifices
Table 6
Manifold Pressure & Gas Consumption *
Figure 10
Dials of Typical Gas Meter
Natural Propane
BTU/Cu. Ft. 1050 2500 No. of
Model Specific Gravity 0.60 1.53 Orifices
Manifold Pressure In. W.C. 3.5 10.0
CFH 28.6 12.0
Gal/Hr.Propane – .33
PD 30 Sec/cu. ft. 126 300 1
Orifice Drill Size 38 52
CFH 47.6 20.0
PD 50 Gal/Hr. Propane – .55
BD 50 Sec/cu. ft. 76 180 1
Orifice Drill Size 30 45
CFH 71.4 30.0
PD 75 Gal/Hr. Propane – .82
BD 75 Sec/cu. ft. 50 120 1
Orifice Drill Size 21 39
CFH 95.2 40.0
PD 100 Gal/Hr.Propane – 1.15
BD 100 Sec/cu.ft. 38 90 2
Orifice Drill Size 30 45
CFH 119.0 50.0
PD 125 Gal/Hr.Propane – 1.43
BD 125 Sec/cu.ft. 30 72 2
Orifice Drill Size 26 43
CFH 138.1 58.0
PD 150 Gal/Hr.Propane – 1.64
BD 150 Sec/cu.ft. 26 62 2
Orifice Drill Size 21 39
CFH 166.7 70.0
PD 175 Gal/Hr.Propane – 1.86
BD 175 Sec/cu.ft. 22 51 3
Orifice Drill Size 28 43
CFH 190.5 80.0
PD 200 Gal/Hr.Propane – 2.19
BD 200 Sec/cu.ft. 19 45 3
Orifice Drill Size 25 42
CFH 238.1 100.0
PD 250 Gal/Hr.Propane – 2.74
BD 250 Sec/cu.ft. 15 36 3
Orifice Drill Size 18 36
CFH 285.7 120.0
PD 300 Gal/Hr.Propane – 3.29
BD 300 Sec/cu.ft. 13 30 4
Orifice Drill Size 21 39
CFH 333.3 140.0
PD 350 Gal/Hr.Propane – 3.84
BD 350 Sec/cu.ft. 11 26 5
Orifice Drill Size 23 41
CFH 381.0 160.0
PD 400 Gal/Hr.Propane – 4.38
BD 400 Sec/cu.ft. 9 23 6
Orifice Drill Size 25 42
Table 4
Meter-Timing Gas
(Time required for one revolution is charted for various size
meter dials and various rates of gas input in cu. ft. per hour. To
convert to Btuh, multiply by the heating value of the gas used.)
Time for 1
Revolution,
Sec.
1/2 cu. ft. 1 cu. ft. 2 cu. ft. 5 cu. ft.
Input, Cu. Ft. per Hour, When Meter Dial Size is:
*Above gases based on average standards.Units can be furnished
for gases of different values and specific gravities. (Gal./Hr.based
on 60°F. 30" Hg., 91,500 BTU/Gal.) In Canada, refer to rating plate
on side of unit for orifices at high altitude.
Pilot Orifice Identity Numbers
Pilot Burner Identity No. Identity No.
Manufacturer Natural Gas Propane Gas
Honeywell
BCR-18 BBR-11
R
obertshaw
Johnson
7715 4710
1 8
①
N
1 O
①
P
L
① As number appears on top of pilot orifice.
PILOT TUBING
FAN
GUARD
FAN MOTOR
COMBINATION
GAS CONTROL
IGNITION
CONTROL
CONTROL
TRANSFORMER
JUNCTION
BOX
TERMINAL
BOARD
ENTRANCE FOR
COMBUSTION AIR
Heater Parts from ACF Greenhouses