Carrier 50YX - Manual (Page 2)

Indoor-fan motors have been care­
fully selected to minimize energy-
consumption and to withstand the
heavy-duty, year-round operation
required by heat pumps. These motors
are designed to meet the require­
ments of a wide variety of residential
and light commercial applications.
Direct-drive, PSC (permanent split
capacitor), outdoor-fan motors have
been selected to help reduce energy
consumption Units are designed
for cooling operation down to 55 F
Built-in reliability components include
a low-pressure switch that stops the
compressor if the refrigerant pressure
drops to an unsafe operating level,
a discharge thermostat on the compres­
sor which protects against overheat­
ing, a thermostatic expansion value
(TXV) which keeps liquid refriger­
ant from flooding into the compressor
and ensures optimum performance
under all conditions, and a compressor
time-delag which prevents the com­
pressor from attempting to restart for 5
minutes after shutdown, to allow for
pressure equalization
Indoor and outdoor coils are com­
puter designed for optimum heat
transfer Vertical outdoor-fan discharge
carries sound and air up and away.
The high-voltage inlet panel is designed
to accommodate a field-installed elec­
trical disconnect. A low-voltage ter­
minal block simplifies thermostat
connections. Refrigerant service con­
nections make checking operating
pressures easier
Time/temperature defrost system is
used to increase heating cycle effi­
ciency. This type of defrost system has
proven to be very reliable. The time/
temperature control “looks” for coil
icing conditions only at preset time
intervals, start the defrost cycle only if
the defrost thermostat senses icing
conditions, and automatically ends the
defrost cycle when the coil has
warmed sufficiently to melt the ice.
A separate power supply is not
required for electric heaters when an
accessory single point box kit is used.
This accessory provides for a single
power supply for the packaged unit
and accessory electric heater packages,
and functions as an NEC (National
Electrical Code) approved fused
disconnect
Weatherized cabinets are con­
structed of heavy-duty, phosphated,
zinc-coated steel, and are finished with
corrosion-resistant baked enamel
Interior surfaces of the blower section
are insulated to help keep the con­
ditioned air from being affected by the
outdoor ambient temperature
Page
Features/Benefits ............................................. .............................. 1,2
Model Number Nomenclature ... . . . . .................................3
ARI Capacities . . ...................................................... ........................................ 3
Physical Data . ................................. .................................... .................... 4
Accessories . . . . . . . . . 4
Dimensions . . . . . ..................5
Selection Procedure ............................................. . . . . ....................... 6
Performance Data . . ............................................................... ............................7-13
Electrical Data................................................................ .......... 14,15
Controls . . . . . .................................................................... ...................................... 1 5
Typical Control Wiring Schematic........................
...................................... 16
Typical Installation ... ...................................... 17
Guide Specifications ....................................... . 18,19