Midco Economite RE6850B - Manual (Page 10)

8. To determine the firing rate for NATURAL gas, accurately time test dial for the number
of seconds for one revolution and use the following formula. All other gas utilization
equipment must be off.
3600 x test dial size x BTU value
= BTU/Hr.
No. of seconds for one rev. test dial
Then divide by 1,000 for MBH value.
Example: 3600 x 1 x 1000
= 360,000 BTU/HR = 360 MBH
10
10
Part 1
Installation
Continued
Part 1 Installation
RE6700B
2.4
2.1
2.2
2.4
2.3
2.5
2.2
2.5
2.4
2.0
0.563
0.563
0.484
0.422
0.404
0.358
0.332
0.297
0.277
0.277
2.5
2.3
2.7
2.3
2.8
2.3
2.1
3.0
2.2
2.2
No Orifice
No Orifice
0.563"
0.563"
0.484"
0.484"
0.422"
0.358"
0.358"
0.332"
700
650
600
550 *
500
450
400
350
300
275
Table 3: Capacity and Preliminary Gas Settings
1. Adjust the main regulator to vary the manifold gas pressure and burner input within the range shown.
Do not exceed pressure as listed in Table 3, under any circumstances. Use combustion readings (CO
or O2) to determine exact inputs.
2. If you need an orifice that is not included with the burner, drill out the provided 0.358 orifice
(stamped J ) to the required hole size as per chart above
3. Natural gas to LP gas conversion kits are available, consult factory.
* Orifice size and approximate manifold gas pressure setting as shipped. Air shutter is set on mark 4.
DATA FOR TABLES IS APPROXIMATE AND BASED ON “0" OVERFIRE PRESSURE AT SEA LEVEL
2.5
2.3
2.7
2.4
2.1
2.2
2.4
2.3
2.5
2.2
2.5
2.4
2.0
No Orifice
No Orifice
0.563"
0.563"
0.563"
0.484"
0.422"
0.404"
0.358"
0.332"
0.297"
0.277"
0.277"
3.7
3.5
2.9
2.5
2.3
2.7
2.3
2.8
2.3
2.1
3.0
2.2
2.2
No Orifice
No Orifice
No Orifice
No Orifice
No Orifice
0.563"
0.563"
0.484"
0.484"
0.422"
0.358"
0.358"
0.332"
Input
MBTU/HR
1
Orifice
Size
(Inches)
Natural Gas
Natural Gas / Propane Gas Orifice Size and Pressure Settings
Manifold
Pressure
("W.C)
Orifice
Size
(Inches)
825
800
750
700
650
600
550 *
500
450
400
350
300
275
Propane Gas
Manifold
Pressure
("W.C)
-
-
-
-
-
H
H
O
O
F
J
J
K
-
-
H
H
H
O
F
P
J
K
L
N
N
Letter
Stamp
Letter
Stamp
-
-
H
H
O
O
F
J
J
K
H
H
O
F
P
J
K
L
N
N
Note: Manifold Pressure settings are based on zero back pressure
RE6850 & RE6850B
VIII Initial Start-
up /Adjustment
Continued