RXB PLUS ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.101-IOM (JAN 13)
Page 63
Do.not.drill.into.an.electronic.control.panel.to.locate.conduit.
connections..You.are.probably.not.entering.the.panel.where.
the.manufacturer.would.like.you.to.since.most.manufactur-
ers.recommend.or.provide.prepunched.conduit.connections...
You.may.also.be.negating.the.NEMA.rating.of.the.enclosure..
Drilling.can.cause.metal.filings.to.land.on.the.electronics.and.
create.a.short.circuit.when.powered.is.applied..If.you.must.
drill.the.panel,.take.the.following.precautions:.
•
. First,.call.the.panel.manufacturer.before.drilling.into.the.
panel.to.be.sure.you.are.entering.the.panel.at.the.right.
place..
•
. Take.measures.to.avoid.ESD.(electrostatic.discharge).to.
the. electronics. as. you. prep. the. inside. of. the. Electronic.
control.panel..This.can.be.done.by.employing.an.antistatic.
wrist.band.and.mat.connected.to.ground..
•
. Cover.the.electronics.with.plastic.and.secure.it.with.mask-
ing.or.electrical.tape..
•
. Place.masking.tape.or.duct.tape.on.the.inside.of.the.panel.
where.you.are.going.to.drill..The.tape.will.catch.most.of.
the.filings..
•
. Clean. all. of. the. remaining. filings. from. the. panel. before.
removing.the.protective.plastic..
When. routing. conduit. to. the. top. of. an. electronic. control.
panel,.condensation.must.be.taken.into.consideration..Water.
can.condense.in.the.conduit.and.run.into.the.panel.causing.
catastrophic.failure..Route.the.conduit.to.the.sides.or.bottom.
of.the.panel.and.use.a.conduit.drain..If.the.conduit.must.be.
routed.to.the.top.of.the.panel,.use.a.sealable.conduit.fitting.
which. is. poured. with. a. sealer. after. the. wires. have. been.
pulled,. terminated,. and. the. control. functions. have. been.
checked..A.conduit.entering.the.top.of.the.enclosure.must.
have. a. NEMA-4. hub. type. fitting. between. the. conduit. and.
the.enclosure.so.that.if.water.gets.on.top.of.the.enclosure.it.
cannot.run.in.between.the.conduit.and.the.enclosure..This.
is.extremely.important.in.outdoor.applications.
NOTE: It is simply NEVER a good practice to enter
through the top of an electronic control panel or starter
panel that does not already have knockouts provided. If
knockouts are not provided for this purpose it is obvious
this is not recommended and could VOID WARRANTY.
Never add relays, starters, timers, transformers, etc. in-
side an electronic control panel without first contacting
the manufacturer.
Contact. arcing. and. EMI. emitted. from.
these.devices.can.interfere.with.the.electronics..Relays.and.
timers.are.routinely.added.to.electronic.control.panels.by.the.
manufacturer,.but.the.manufacturer.knows.the.acceptable.
device. types. and. proper. placement. in. the. panel. that. will.
keep.interference.to.a.minimum..If.you.need.to.add.these.
devices,.contact.the.manufacturer.for.the.proper.device.types.
and.placement....
Never run refrigerant tubing inside an electronic control
panel.
If.the.refrigerant.is.ammonia,.a.leak.will.totally.destroy.
the.electronics.
If the electronic control panel has a starter built into the
same panel, be sure to run the higher voltage wires where
indicated by the manufacturer.
. EMI. from. the. wires. can.
interfere.with.the.electronics.if.run.too.close.to.the.circuitry.
Never daisy-chain or parallel-connect power or ground
wires to electronic control panels.
.Each.electronic.control.
panel.must.have.its.own.control.power.supply.and.ground.
wires.back.to.the.power.source.(Plant.Transformer)..Multiple.
electronic.control.panels.on.the.same.power.wires.create.
current.surges.in.the.supply.wires,.which.may.cause.control-
ler.malfunctions..Daisy-chaining.ground.wires,.taking.them.
to. ground. at. each. device,. allows. ground. loop. currents. to.
flow.between.electronic.control.panels.which.also.causes.
malfunctions..See.Figure.25.
Figure 25
