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SINGLE-PHASE
L1
CONNECTIONS
TO DISCONNECT
L2
PER NEC
NOTE: Use copper wire only.
LEGEND
NEC – National Electrical Code
Field Wiring
Splice Connections
Fig. 12 - - Line Power Connections
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. 14.
The unit transformer supplies 24- -v power for complete system
including accessory electrical heater. A circuit breaker is provided
in the 24- -v circuit as a protection device (See Fig. 17); see the
caution label on the transformer. 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 fan coil board is fused by a board- -mounted automotive fuse
placed in series with transformer SEC1 and R circuit (See F1 on
Fig. 15). The C circuit of transformer circuit is referenced to
RETURN
AIR
TOP COVER
Fig. 11 - - Typical Installation
GROUND SCREW
(IN SPLICE BOX)
GROUND
LEAD
BLK
YEL
A06299
POWER ENTRY
CONTROL ENTRY
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 50XT- -A
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 Temperature Sensor (OAT)
!
EQUIPMENT OPERATION HAZARD
Failure to follow this caution may result in improper unit
operation.
The installation of an outdoor air temperature sensor (OAT)
using the Infinity control board OAT terminals is required.
Many Infinity features (auto humidity control, comfort
rollback, etc.) will be lost if the OAT is not connected.
For detailed mounting instructions for the OAT sensor,
please refer to installation instructions shipped with the
OAT.
The OAT input is used to supply outdoor temperature data for
system level functions and for temperature display on UI. Using
two wires of the field- -supplied thermostat wire cable, wire the ends
of the two black OAT pigtails. Wire the opposite ends of these two
wires to the OAT provided with the UI. There is no polarity to be
observed.
11
INDOOR
THERMOST A T
FROM
POWER
SOURCE
DISCONNECT
PER NEC
per instructions
CAUTION
A09091
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