Model Type
(Tubular HX)
HD - Power Vented
Propeller Unit
(30-125MBH)
HDB - Power Vented
Blower Unit
(60-125MBH)
HDS - Separated
Combustion
Propeller Unit
(30-125MBH)
HDC - Separated
Combustion Blower
Unit (60-125MBH)
PTS - Separated
Combustion Propeller
Unit (150-400MBH)
BTS - Separated
Combustion Blower
Unit (150-400MBH)
PTC - High Efficiency,
Separated Combustion
Propeller Unit
(135-310MBH)
75-537.7
5H75697B
Identifying the Model and Control Code
Figure 1.1 explains the model number designations. To be
convertible, the first three characters in the model number must be
HD, HDB, HDS, HDC, PTS, BTS or PTC.
After obtaining this information, refer to the proper selection
chart. The selection charts are differentiated by product type,
altitude and fuel type. If you are converting from natural gas
to propane gas and want to operate at high altitude, both a
propane conversion kit and a propane high altitude kit must
be used. Selection charts include the proper kit suffix, the orifice
drill size, and the number of orifices required for the unit being
converted. Drill sizes are also stamped on each orifice.
Modine gas-fired equipment ratings are certified by CSA or ETL.
For elevations above 2000 ft., ANSI Z223.1 requires ratings be
reduced 4 percent for each 1000 ft. above sea level. For units in
Canada CSA requires that ratings be reduced 10% at elevations
above 2000 ft. The high altitude kits appearing in this bulletin
are for use with units that will be installed over 2000 feet. These
kits comply with both ANSI Z223.1 and CSA requirements.
If a unit is to be installed at higher elevations AND converted
from natural gas to propane gas operation, a propane
conversion kit must be used in conjunction with the high altitude
kit. When converting units to propane at elevations over
2,000 ft., the main burner orifices in the propane conversion
kit must be replaced with the orifices from the “high altitude”
orifice kit. The remaining components of the propane gas kit,
other than the main burner orifices, are required to complete
the conversion to propane gas, regardless of the elevation at
which the unit is installed. For the Selection and Installation
Instructions for propane conversion kits, please see the latest
revision of Modine Bulletin 75-513 for Control Code 34 units
and 75-515 for Control Code 11 and 12 units.
SELECTION AND INSTALLATION INSTRUCTIONS
high altitude orifice kit
model HD/HDB, HDS/HDC, PTS/BTS, and PTC
August, 2009
THIS MANUAL IS THE PROPERTY OF THE OWNER.
PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.
WARNING
1. All field gas piping must be pressure/leak tested prior to
operation. Never use an open flame. Use a soap solution
or equivalent for testing.
2. Gas supply shall be shut-off and the electrical power
disconnected before proceeding with the conversion.
Failure to do so could result in fire, explosion or electrical
shock.
1. The use of this manual is specifically intended for a
qualified installation and service agency. All installation
and service of these kits must be performed by a qualified
installation and service agency.
2. These instructions must also be used in conjunction with
the Installation and Service manual originally shipped with
the appliance being converted, in addition to any other
accompanying component supplier literature.
IMPORTANT
Figure 1.1 - Model Number Designations
HD 45 A S 01 1 1
Power Code
01 - 115 volt, 60 hertz,
single phase
Ignition Type
H - Hot Surface
S - Direct Spark
Heat Exchanger Type
A - Aluminized
S - Stainless Steel
MBH Input
30 - 30,000 Btu/hr input
through
400 - 400,000 Btu/hr input
Control Code
11 - Single Stage,
Natural Gas
12 - Two Stage,
Natural Gas
21 - Single Stage,
Propane Gas
22 - Two Stage,
Propane Gas
34 - Single Stage,
Natural Gas
74 - Single Stage,
Propane Gas
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