24
GUIDE SPECIFICATIONS (CONT)
M. Special Features:
1. Coil Options:
Shall include factory--installed optional tin--plated indoor
copper/copper and vinyl--coated refrigerant coils.
2. Flat Roof Curb:
Curbs shall have seal strip and a wood nailer for flashing and
shall be installed per manufacturer’s instructions.
3. Manual Outdoor Air Damper:
Package shall consist of damper, bird screen, and rain hood
which can be preset to admit outdoor air for year--round ven-
tilation.
4. Infinity
t
User Interface (UI):
To provide for two--stage cooling and electric (auxiliary) heat
in addition to manual or automatic changeover and indoor fan
control.
5. Low--Ambient Cooling:
Low--ambient cooling must be enabled in UI setup to allow
unit to operate down to 0
°
F (--17.7
°
C) outdoor ambient tem-
perature in cooling.
6. Filter Rack Kit:
Shall provide filter mounting for downflow and horizontal
applications.
7. Square--To--Round Duct Transitions:
Shall have the ability to convert the supply and return open-
ings from rectangular to round (024--048 sizes only).
8. Crankcase Heater:
Shall provide anti--floodback protection for low--load cool-
ing applications. (Standard on all sizes.)
9. Electric heaters:
a. Electric heater shall be available as a field--installed
option.
b. Heater elements shall be open--wire type, adequately
supported and insulated with ceramic bushings.
c. Electric heater packages must provide single--point
power connection capability.
10. Compressor Hard Start Kit:
Shall be available to give a boost to the compressor motor at
each start--up.
Copyright 2008 Carrier Corp.
S
7310 W. Morris St.
S
Indianapolis, IN 46231
Printed in U.S.A.
Edition Date: 06/08
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: 50XL---04PD
Replaces: 50XL--- 3PD
50X
L
