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Copyright 2005 Carrier Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 Printed in U.S.A. edition date: 10/05
Manufacturer reserves the right to change, at any time, specifications or designs without notice and obligations
Catalog No: 50XP-4PD Replaces: 50XP-3PD
L. Grille
1. Louvered Grille:
Louvered grille shall be standard on all units.
M. Special Features Available
1. Coil Options:
Shall include factory-installed optional tin-plated
indoor, copper/copper and vinyl-coated refriger-
ant coils.
2. Economizer:
a. Economizer controls capable of providing free
cooling using outside air.
b. Equipped with low leakage dampers not to ex-
ceed 3% leakage, at 1.0 in. wg pressure differen-
tial.
c. Spring return motor shuts off outdoor damper on
power failure.
3. Flat Roof Curb:
Curbs shall have seal strip and a wood nailer for
flashing and shall be installed per manufacturer’s
instructions.
4. Manual Outdoor Air Damper:
Package shall consist of damper, birdscreen, and
rainhood which can be preset to admit outdoor air
for year-round ventilation.
5. Thermostat:
To provide for one-stage heating and cooling in ad-
dition manual or automatic changeover and indoor
fan control.
6. Low Ambient Package:
Shall consist of a solid-state control and condenser
coil temperature sensor for controlling condenser-
fan motor operation, which shall allow unit to oper-
ate down to 0° F outdoor ambient temperature.
7. Filter Rack Kit:
Shall provide filter mounting for downflow or hori-
zontal applications.
8. Square-To-Round Duct Transitions (024-048):
Shall have the ability to convert the supply and re-
turn openings from rectangular to round. (024-048
only)
9. Compressor Protection (Time Guard® II Kit)
Solid-state control shall protect compressor by pre-
venting “short cycling.”
10. Crankcase Heater:
Shall provide anti-floodback protection for low-
load cooling applications.
11. Electric heaters:
a. Electric heater shall be available as a field-
installed option.
b. Heater elements shall be open wire type, ade-
quately supported and insulated with ceramic
bushings.
c. Electric heater packages must provide single
point power connection capability.
12. Compressor Hard start kit:
Shall be available to give a boost to the compressor
motor at each start-up. (Single Phase only).
Guide specifications (cont)