Mortex Products Inc. / Fort Worth, TX 76106
G18D Installation Instructions
G18D Series Gas Furnace
INSTALLATION INSTRUCTIONS
11
NATURAL GAS
ELEVATION
60,000 BTU FURNACE
70,000 BTU FURNACE
77,000 BTU FURNACE
90,000 BTU FURNACE
PART NO
ORIF DIA DRILL SIZE PART NO
ORIF DIA DRILL SIZE PART NO
ORIF DIA DRILL SIZE PART NO
ORIF DIA DRILL SIZE
SEA LEVEL
75AG-144
0.144
27
75AG-157
0.157
22
75AG-166
0.166
19
75AG-173
0.173
17
2000
75AG-1405
0.1405
28
75AG-154
0.154
23
75AG-161
0.161
20
75AG-1695
0.1695
18
3000
75AG-1405
0.1405
28
75AG-152
0.152
24
75AG-161
0.161
20
75AG-166
0.166
19
4000
75AG-136
0.136
29
75AG-1495
0.1495
25
75AG-159
0.159
21
75AG-166
0.166
19
5000
75AG-136
0.136
29
75AG-147
0.147
26
75AG-157
0.157
22
75AG-161
0.161
20
6000
75AG-136
0.136
29
75AG-144
0.144
27
75AG-154
0.154
23
75AG-159
0.159
21
7000
75AG-1285
0.1285
30
75AG-144
0.144
27
75AG-1495
0.1495
25
75AG-157
0.157
22
8000
75AG-1285
0.1285
30
75AG-1405
0.1405
28
75AG-147
0.147
26
75AG-154
0.154
23
9000
75AG-1285
0.1285
30
75AG-136
0.136
29
75AG-144
0.144
27
75AG-152
0.152
24
10000
75AG-120
0.120
31
75AG-136
0.136
29
75AG-1405
0.1405
28
75AG-147
0.147
26
PROPANE (LP) GAS
ELEVATION
60,000 BTU FURNACE
70,000 BTU FURNACE
77,000 BTU FURNACE
90,000 BTU FURNACE
PART NO
ORIF DIA DRILL SIZE PART NO
ORIF DIA DRILL SIZE PART NO
ORIF DIA DRILL SIZE PART NO
ORIF DIA DRILL SIZE
SEA LEVEL
75AG-086
0.086
44
75AG-0935
0.0935
42
75AG-096
0.096
41
75AG-104
0.104
37
2000
75AG-082
0.082
45
75AG-0935
0.0935
42
75AG-0935
0.0935
42
75AG-1015
0.1015
38
3000
75AG-082
0.082
45
75AG-089
0.089
43
75AG-0935
0.0935
42
75AG-0995
0.0995
39
4000
75AG-082
0.082
45
75AG-089
0.089
43
75AG-0935
0.0935
42
75AG-0995
0.0995
39
5000
75AG-081
0.081
46
75AG-089
0.089
43
75AG-089
0.089
43
75AG-098
0.098
40
6000
75AG-0785
0.0785
47
75AG-086
0.086
44
75AG-089
0.089
43
75AG-096
0.096
41
7000
75AG-0785
0.0785
47
75AG-086
0.086
44
75AG-086
0.086
44
75AG-0935
0.0935
42
8000
75AG-076
0.076
48
75AG-082
0.082
45
75AG-086
0.086
44
75AG-0935
0.0935
42
9000
75AG-076
0.076
48
75AG-081
0.081
46
75AG-082
0.082
45
75AG-089
0.089
43
10000
75AG-073
0.073
49
75AG-0785
0.0785
47
75AG-081
0.081
46
75AG-089
0.089
43
Table shows 4% Input Reduction per 1,000 feet elevation
Reference: NFPA No. 54, ANSI Z 223.1 National Fuel Gas Code
For Canadian High Alitude (2,000-4,500 feet), reduce gas pressure to burner manifold (manifold Ps.) to 3.0” W.C. and 9.0 W.C. for LP (Propane) Gas
KIT PART NUMBER ALTITUDE FURNACE INPUT
G18HA0601
0 - 5000 FT
60,000
G18HA0602
6,000 - 10,000 FT
60,000
G18HA0701
0 - 5000 FT
70,000
G18HA0702
6,000 - 10,000 FT
70,000
G18HA0771
0 - 5000 FT
77,000
G18HA0772
6,000 - 10,000 FT
77,000
G18HA0901
0 - 5000 FT
90,000
G18HA0902
6,000 - 10,000 FT
90,000
HIGH ALTITUDE ORIFICE CONVERSION kITS
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HIGH ALTITUDE DERATE CHART – MAIN BURNER ORIFICE SIZE
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MGD-B SERIES GAS FURNACE
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