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920-087-04 (8-05)
Desk ControlTerminals
The Friedrich PD model PTAC has built-in provisions for
connection to an external switch to control power tothe 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 switchto the
D1 terminal and the other to the D2 terminal (See figure 13).
Whenever the switch closes the unitoperation will stop.
Maximum Wire Length for Desk Control Switch
Wire Size
#24
#22
#2O
#18
#16
Maximum Length
400 ft.
6OOft.
9OOft.
1500 ft.
2000 ft.
Note: The desk
control system and
switches must be
field supplied.
Auxiliary Fan Control
The Smart Center also has the ability to control a 24VAC relay
to activate an auxiliary, or transfer, fan. The outputs are listed as
F1and F2on the control board.
To connect the relay,simply wire oneside of the relay to F1and
the othersideto F2.Anytime thatthe PTACfan runstheterminals
will send a 24VACsignal to the relay.The relay must be24 VAC,
50mA or less.
Note: The relay and auxiliary fans must befield supplied.
NOTE: It isthe installer's responsibility to ensure that all control
wiring connections are made in accordance with the installation
instructions. Improperconnection ofthethermostat control wiring
and/or tampering with the unit's internal wiring can void the
equipment warranty and may resultinproperty damage, personal
injury or death. 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 the factory.
G.FreshAirVentControl
The vent control lever is located behind the front cover on the
left side of the unit. The unit is shipped in the closed position
with a locking screw in place. The screw must be removed to
operate the lever. When the lever is back, (OPEN), outside air
is mixed with indoor air. When the lever is forward, (CLOSED),
no outside air isadmitted into the room and room airis recycled
through the unit.
NOTE: The vent should remain closed for peak operating efficiency.
OPEN CLOSED
OUVERT FERME
ABIERTA CERRADA
VENT
AERATION
SALIDA (ESCAPE)
DEL AiRE
FRESH AIR DOOR IS FACTORY
SHIPPED IN CLOSED POSITION.
REMOVE TOP SCREW ON LEVER
TO OPEN DOOR.
250-453-01
H.Air DischargeGrille
Moving parts hazard,
Turn off electric power before
servicing this component.
Failure to do so can result in property
damage, personal injury and/or death.
Theair dischargegrille canbe redirectedto blowaireitherstraightup oratan angle intotheroom. Tochangethe airflowdirection,remove
thefront cover, locate and removethe six grill retainingscrews. Reversethe ends of the grilleand refasten the grille tothe cover.
19
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