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ROUTING
POWER
LEADS
INTO UNIT
Use only
copper
wire
between
disconnect
and unit.
The
high
voltage
leads should be in a conduit
until they enter the duct panel;
conduit
termination
at the duct panel must be watertight.
Run the
high-voltage
leads through the power entry knockout
on the power
entry
side
panel.
See Fig.
5 and 6 for location
and size. For
single-phase
units, connect
leads to the black and yellow wires.
CONNECTING
GROUND
LEAD TO GROUND
SCREW
Connect
the ground lead to the chassis using the ground screw in the
wiring splice box (See Fig. 11).
ROUTING
CONTROL
POWER
WIRES
For detailed
instruction
on the low voltage
connections
to the User
Interface
(UI), refer to the UI installation
guide.
Form a drip-loop
with the control leads before routing
them into the
unit.
Route
the low
voltage
control
leads
through
grommeted.
low-voltage
hole provided
into unit (See Fig. 5 and 6). Connect
user
interface
leads to unit control power
leads as shown
in Fig. 13.
The unit transformer
supplies
24-v
power
for complete
system
including
accessory
electrical
heater. Transformer
is factory wired
for 230-v
operation.
If supply voltage
is 208-v.
rewire transformer
primary
as described
in Special
Procedures
for 208-v
Operation
section.
The low-voltage
circuit is fused by a board-mounted
automotive
fuse placed in series with transformer
SEC1 and R circuit (See F1
on Fig. 14). The C circuit of transformer
circuit is referenced
to
chassis
ground
through
a printed
circuit
run at SEC2
and metal
control board mounting
eyelets.
Check to be sure control board is
mounted
securely
using both factory-installed
screws.
ACCESSORY
INSTALLATION
A. Accessory
Electric Heaters
Electric heaters may be installed
in 50DU
per instructions
supplied
with
electric
heater
package.
See
unit
rating
plate
for
factory-approved
electric heater kits.
NOTE:
Units
installed
without
electric
heat
should
have
a
factory-supplied
sheet metal block-off
plate installed
over heater
opening.
This
reduces
air
leakage
and
formation
of exterior
condensation.
B. Outdoor
Air Thermistor
(OAT)
NOTE:
THE
INSTALLATION
OF
AN
OUTDOOR
TEMPERATURE
SENSOR
USING
THE
INFINITY
CONTROL
BOARD
OAT
TERMINALS
IS REQUIRED.
MANY
INFINITY
FEATURES
(ELECTRIC
HEAT
LOCKOUT,
AUTO
HUMIDITY
CONTROL,
COMFORT
ROLLBACK)
WILL
BE
LOST
IF
THE
OAT
IS
NOT
CONNECTED.
For detailed
mounting
instructions
for the OAT sensol;
please
refer to TSTATXXSEN01-B
installation
instructions
(catalog
no. 63TS-TAI3);
Procedures
1 through
3.
The OAT
input
is used to supply
outdoor
temperature
data for
system level functions
and for temperature
display on User Interface
(UI). Using two wires of the field-supplied
thermostat
wire cable,
wire the ends of the two black OAT pigtails. Wire tire opposite ends
of these two wires to tire OAT provided with the UI. There is no
polarity to be observed.
NOTE:
Mis-wiring
OAT inputs
will not cause damage
to either
Infinity control or thermistor.
If the thermistor
is wired incorrectly,
no reading
will appear
at UI. Re-wire
thermistor
correctly
for
normal operation.
C.
Humidifier
Connections
The fan coil control board
terminal
marked
HUM
is provided
for
low voltage
(24-vac)
control
of a humidifier.
No humidistat
is
required
as UI monitors
indoor
humidity.
When
cnmmanded
to operate
humidifier,
the unit control
will
energize
the HUM
output to turn humidifier
on and de-energize
HUM
output to turn humidifier
off. Wire HUM
and C terminals
directly
to humidifier
as shown
in Fig. 13.
SPECIAL
PROCEDURES
FOR 208-V
OPERATION
Be sure unit disconnect
switch is open.
Disconnect
the yellow primary
lead from the transformer.
See unit
wiring
label (See Fig. 16).
Connect
the yellow primary
lead to the transformer
terminal
labeled
200-v.
GROUND
SCREW
(IN SPLICE BOX)
SINGLE-PHASE
CONNECTIONS
TO DISCONNECT
PER NEC
GROUND
LEAD
L1
_.---
BLK--
L2
........
/_--
YEL--
NOTE:
Use copper
wire only.
LEGEND
NEC
-
National
Electrical
Code
= = =
Field Wiring
Splice
Connections
A06299
Fig. 11 - Line Power Connections
HP/AC
BOARD
Fig. 12 - Control
Plate
A06312
10
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