Friedrich 920-087-09 (12/10) - Manual (Page 26)

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Desk Control Terminals
The.Friedrich.PD.model.PTAC.has.built-in.provisions.for.connection.to.an.
external.switch.to.control.power.to.the.unit..The.switch.can.be.a.central.
desk.control.system.or.even.a.normally.open.door.switch.
For.desk.control.operation.connect.one.side.of.the.switch.to.the.D1.terminal.
and.the.other.to.the.D2.terminal.(See.Figure.31,.Page.23)..Whenever.the.
switch.closes.the.unit.operation.will.stop.
NOTE:. The.desk.control.system.and.switches.must.be.field.supplied.
Energy Management
Sometimes.known.as.Front.Desk.Control,.an.input.is.provided.so.that.the.
unit.can.be.manually.disabled.from.a.remote.location...If.the.unit.detects.
24Vac.on.this.input,.it.will.automatically.turn.itself.off...If.no.voltage.is.
detected.on.the.input.,.the.unit.will.run.normally.
NOTE:.. It.is.the.installer's.responsibility.to.ensure.that.all.control.wiring.
connections.are.made.in.accordance.with.the.installation.
instructions..Improper.connection.of.the.thermostat.control.
wiring.and/or.tampering.with.the.unit's.internal.wiring.can.
void.the.equipment.warranty..Other.manufacturer's.PTACs.
and.even.older.Friedrich.models.may.have.different.control.
wire.connections...Questions.concerning.proper.connections.
to.the.unit.should.be.directed.to.Friedrich.
WARNING
Electrical Shock Hazard
Turn off electrical power before service
or installation.
ALL electrical connections and wiring
MUST be installed by a qualified
electrician and conform to the National
Code and all local codes which have
jurisdiction.
Improper connection of the thermostat
control wiring and/or tampering with the
units internal wiring may result in property
damage, personal injury or death.