User's Manual

8 3 6 A 2 k W UHF Tr a nslat or , I nt erna lly Diple x ed Sit e Con sider a t ions
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condensation in Translat ors. For t ube t ype Translators t his can be especially serious if the
condensation form s in t he t ube cavit y and creat es dam aging arcs.
A few caut ions should be observed concerning an air condit ioning syst em .
1. Air condit ioners have an ARI nom inal cooling capacity rat ing. I n selecting your air
condit ioner do not assum e you can equate t his num ber t o your requirem ent s. Make certain
that your cont ractor uses t he act ual condit ions you wish t o m aint ain in determ ining the size
of the unit . Wit h desired condit ioned room tem perature under 80 degrees F t he unit m ust be
derat ed, possibly by a subst ant ial am ount.
2. Do not have t he air condit ioner blowing directly ont o t he Translat or. Condensation m ay
occur on, or worse, in the Translat or under certain condit ions.
3. Do not isolat e t he front of the Translat or from t he back wit h the thought of air condit ioning
the front only. Cooling air is drawn in the front of all Translat ors and in t he front and back
of ot hers. Any att em pt t o isolat e t he front from t he rear will adversely affect t he cooling
air flow.
4. I nterlocking the Translat or wit h the air condit ioner is recom m ended t o preclude operat ion of
the Translator wit hout t he necessary cooling.
5. The periodic cleaning of all filt ers is a m ust .
W hen using ve n t ila t ion alone, t he follow ing genera l st a t e m ent s apply.
1. The Blower with at t endant filt ers should be on t he inlet , t hereby pressurizing t he room
which prevent s the ingress of dirt.
2. The inlet and out let should be on the sam e side of the building, preferably t he leeward side.
The pressure different ial creat ed by wind will be m inim ized. Only t he out let m ay be t hrough
the roof.
3. The inlet and out let should be screened with 1/ 8" hardware clot h ( preferred), galvanized
hardware clot h (acceptable) .
4. Cooling air should ent er the room as low as pract ical but in no case higher than four feet
above t he floor. The inlet m ust be locat ed where dirt, leaves, snow, etc. will not be carried
in wit h t he cooling air.
5. The exhaust should be locat ed as high as possible. Som e ducting is usually required t o
insure com plet e flushing of heat ed air wit h no st agnant areas.
6. The filt er area m ust be adequat e t o insure a m axim um air velocit y of 300 feet per m inut e
through t he filter. This is not a conservat ive num ber but a never exceed num ber. I n a
dust y or rem ote locat ion, t his num ber should be reduced to 150 CFM.
7. The inlet and out let( s) m ust have aut om at ic dam pers that close any t im e t he vent ilat ion
blower is Off.
8. Where Translat ors are regularly Off for a portion of each day a t em perature different ial
sensor controlling a sm all heat er m ust be installed. This sensor will m onit or inside and
outside tem peratures sim ult aneously. I f the inside tem perat ure falls t o within 5 degrees F of
the outside tem perature the heat er will com e On. This will prevent condensat ion w hen t he
vent ilat ion blower com es On and applies even in t he sum m er.