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 MIL-HDBK-1012/1
Provisions for backup heat are
operate whenever there is a full cooling load.
not required.
8.10.3.2 Relocatable and Non-Relocatable Transportables. Relocatable and
non-relocatable transportables more closely resemble permanent facilities than
tactical ones. Therefore, mechanical design is not as restricted, and the
general guidelines listed in Section 4 are more appropriate.
a) Air Conditioning. Tactical types air conditioners are
inappropriate for this class of transportables, but R12 refrigerant should be
used, since refrigerant storage pressures during transportation would be
excessive with R22. Various types of systems may be used, including split
systems with remote DX condensers, commercial-quality single package DX units,
and chilled-water systems with air-cooled chillers. Chilled water systems are
applicable to groups to transportables, especially if they are non-
relocatable.
b) Backup Air Conditioning. This is required for any function
specified as critical in the project BESEP. Special circuiting of coils is
not required. It is recommended that units be incremented to handle only a
portion of the load, with an extra unit used for backup.
c) Heating. Normally, the heat load is minimal and heat required
to maintain space conditions should be provided as part of the air
conditioning unit. Electric resistance heating is preferred because of its
simplicity and reliability. Backup heating is not required.
8.10.4
Electrical. In most cases, the requirements for transportables are
similar to those for transmitter and receiver buildings. In all cases,
installation shall be in accordance with NFPA 70.
Conductors
8.10.4.1
a) Stranded Conductor. Stranded cable shall be used whenever
possible. The use of stranded conductor is mandatory for all power wiring.
b) Solid Conductor. In non-power applications where solid
conductor must be used, the conductor shall be securely anchored along the
entire run, and sufficient slack shall be incorporated at termination points
to compensate for in-transit motion.
8.10.4.2
Conductor Installation
a) Maintainability and future expansion requirements are prime
design
considerations.
b) Cabling and wiring shall be installed to permit circuit
checking or circuit renewal without removing major pieces of equipment.
Planned wiring and preformed harnesses shall be incorporated wherever
possible.
c) Wires and cables shall be situated to minimize inductive and
capacitive effects.
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