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Section 2 - Minimum Installation Requirements
(E-Compact ATSC Transmitters)
2.4
Air Conditioning
2.4.1 Temperature
For optimum equipment performance and longer life the shelter temperature must be rigorously
controlled by means of air conditioning. Taking into consideration the heat dissipation (BTU/
hour) specified for the equipment and the shelter's internal area, the cooling system must be
designed in such a way that the incoming air volume is higher than the outgoing air volume in
order to avoid negative pressure. The shelter temperature must be determined as a function of
the transmission power, as follows:
• LOW POWER E-COMPACT TV TRANSMITTERS: from 0º to 35ºC
• MEDIUM POWER E-COMPACT TV TRANSMITTERS: from 0º to 30ºC
• HIGH POWER E-COMPACT TV TRANSMITTERS: from 0º to 25ºC
If a Hitachi Kokusai Linear equipment is damaged due to the lack or inefficiency of the air
conditioning system, it shall NOT be covered by the guarantee.
2.4.2 Humidity
The relative air humidity inside the shelter is also a very important factor to improve the equipment
performance and extend its life. Hitachi Kokusai Linear equipment must operate in a dry
environment, which can be ensured by means of a suitable air conditioning system. Depending
on the transmission power, the shelter's relative humidity should be as follows:
• LOW POWER E-COMPACT TV TRANSMITTERS: from 0 to 90%
• HIGH POWER AND MEDIUM POWER E-COMPACT: from 0 to 80%
Should never be condensation, as water may damage internal circuitry of the transmitter.
2.4.3 Cooling
The air conditioning system should always be operated in the "recirculation" mode, with the
room temperature being reduced without outside air coming in. For improved cooling system
performance, the air conditioner should be installed in series with the transmitter's cooling cycle.
I.e., the air conditioner's outgoing flow must be directed to the front part of Hitachi Kokusai
Linear TV transmitter.
The transmitter's installation layout should contemplate a free space around the transmitter for
higher cooling efficiency and access for maintenance. Refer to the table below for details:
Note: If the transmitter is installed in a rack, the transmitter front and rear must be entirely unobstructed.
Manual Rev. 0.1 - February 2018
TRANSMITTER
EC701HP
EC702HP
EC703HP
EC704HP
EC706HP
EC708HP
EC712HP
FREE INTERNAL AREA
16.0m2
2-5
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