TM-9-2540-207-14-P
HEATER, VEHICULAR COMPARTMENT, MODEL: A20
TECHNICAL MANUAL; OPERATOR, FIELD, AND SUSTAINMENT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2007
TM-9-2540-207-14-P - Page 46 of 288
TM 9-2540-207-14&P
5-2
5.2
Determining differences between design versions
There are three different design versions/iterations of the A20 Vehicular Compartment heater
currently in use. This technical manual encompasses all three of those versions. In the case
where the procedures in this manual vary from version to version, a separate section will be
shown calling attention to the design iteration to which the procedure applies.
In general, a particular design iteration can be identified through the serial number of the heater
or by the nameplate. For example, design iteration #1 was used in all heaters that have a Global
Thermoelectric nameplate. Refer to Table 1 for a list of design iterations and their respective
serial number ranges. However, in order to be certain of the design iteration of the A20 being
used, refer to the following instructions in order to confirm.
Table 1. A20 Design Iterations
Design Iteration #1
All heaters with Global Thermoelectric nameplates
Design Iteration #2
Hunter Mfg. Co. S/N: 10001 - 21069
Design Iteration #3
Hunter Mfg. Co. S/N: 21070 - Present
In order to determine the design version of A20, remove the top control cover by removing the
four screws as shown in Figure 5.2-1 A20 Control Cover. Set the cover and screws aside.
Figure 5.2-1 A20 Control Cover
Once the cover is removed, inspect the control head area and note the following features in
order to identify design iterations.
Back to Top
