98
a. The grille protects the condenser coil from damage by large objects without increasing unit clearances.
15. Thru--the--Bottom Utility Connectors:
a. Kit shall provide connectors to permit gas and elec trical connections to be brought to the unit through the
basepan.
16. Fan/Filter Status Switch:
a. Provides status of indoor (evaporator) fan (ON/ OFF) or filter (CLEAN/DIRT Y). Status shall be displayed over
communication bus when used with direct digital controls or with an i ndicator light at the thermostat.
17. Outdoor Air Enthalpy Sensor:
a. The out door air enthalpy sensor shall be used to provide single enthalpy cont rol. When used in conjunction
with a re turn air enthalpy sensor, the unit will provide diffe rential enthalpy control. The sensor allows the unit
to determine if outside a ir is suitable for free cooling.
18. Re turn Air Enthalpy Sensor:
a. The return air enthalpy sensor shall be used in conjunction with an outdoor air enthalpy sensor to provide dif-
ferential enthalpy control.
19. Indoor Air Quality (CO
2
)Sensor:
a. Shall be able to provide demand ventilation indoor air quality (IAQ) control.
b. The IAQ sensor shall be available in duct mount, wal l mount, or wall mount with LED display. The setpoint
shall have adjustment capability.
20. Smoke detectors:
a. Shall be a Four--Wire Controller and Detector.
b. Shall be environmental compensated with differential sensing for reliable, stable, and drift--free sensitivity.
c. Shall use magnet --activated test/reset sensor switches.
d. Shall have tool--less connection terminal access.
e. Shall have a recessed momentary switch for testing and resetting the detector.
f. Controller shall include:
(1.) One set of normally open alarm initiation contacts for connection to an initiating device circuit on a fire
alarm control panel.
(2.) Two Form--C auxiliary alarm relays for interface with rooftop unit or other equipment.
(3.) One Form--C supervision (trouble ) relay t o control the operat ion of the Trouble LED on a remote test/reset
station.
(4.) Ca pable of direct connection to two individual detector modules.
(5.) Can be wired to up to 14 other duct smoke detectors for multiple fan shutdown applications.
21. Winter start kit
a. Shall contain a bypass device around the low pressure switch.
b. Shall be required when mechanical cooling is required down to 25_F(--4_C).
c. Shall not be required to operat e on an economizer when below an outdoor ambient of 40_F(4_C).
22. Time Guard
a. Shall prevent com pressor short cycling by providing a 5--m inute de lay (±2 minutes) before restarting a com-
pressor after shutdown for any reason.
b. One de vice shal l be required per compressor.
23. Electric Heat:
a. Heating Section
(1.) Heater element open coil resistance wire, nickel--chrome a lloy, 0.29 inches inside diameter, strung through
cera mic i nsulators mounted on meta l frame. Coil ends are staked and welded to terminal screw slots.
(2.) Heater assemblies are provided with integral fusing for protection of internal heater circuits not exceeding
48 amps each. Auto reset thermo limit controls, magnetic heater contactors (24 v coil) and terminal block
all mounted i n elec tric heater control box (minimum 18 ga galvanized steel) attached to end of heater as-
sembly.
Copyright 2009 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231 Printed in U.S.A. Edition Da te: 04/09
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: 50TC---05PD
Replaces: 50TC---04PD
50TC
To Previous Page
Loading...
