Heat Controller MGD90-E5B - GAS VALVE CONVERSION INSTRUCTIONS; HIGH ALTITUDE DERATE CHART - MAIN BURNER ORIFICE SIZE; HIGH ALTITUDE ORIFICE CONVERSION KITS

Mortex Products Inc. / Fort Worth, TX 76106 G18D Installation Instructions
G18D Series Gas Furnace INSTALLATION INSTRUCTIONS
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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
GAS VALVE CONVERSION INSTRUCTIONS
HIGH ALTITUDE DERATE CHART – MAIN BURNER ORIFICE SIZE
Installation Instructions MGD-B SERIES GAS FURNACE Heat Controller, Inc.
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