TM 5-4520-256-14
1-9.1. DIFFERENCES BETWEEN MODELS. (Refer to Figure 1-5).
There are two models of the heater, duct type portable HDU-36/E, 120,000 Btu covered in this manual. These models
are designated as follows:
Model
P/N
Air Force
H82
8720650-100
Army
H83
8720650-101
Major differences between the two models are listed below and are described in subsequent paragraphs. Maintenance
procedures appearing in this manual that are applicable to only specific model of heater are identified in the paragraph
heading on procedural step. Procedures applicable to both models do not contain any designation.
a. Model H82 has Power Cable P/N 13039-101 (1) installed that is connected to a power source for operating the
heater.
b. Model H83 has Power Cable P/N 13039-102 (2) installed that is compatible with the Army Distribution Illumination
System Electrical (DISE).
c. Model H83 incorporates a Motor Starter (3) P/N 13229E8010 that limits the inrush current for 3 seconds to the fan
motor and prevents the Circuit Breaker tripping on the 3Kw Generator during initial power application.
d. Model H83 has a cover over the Terminal Board (4) to eliminate the possibility of an accidental electrical shock.
e. Model H83 replaces the rigid fuel line (5) between the bulkhead and fuel pump with a flexible hose assembly.
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