Carrier 50TFQ004 Product Data page 75

*10. Differential Enthalpy Sensor:
a. For use with economizer only.
b. Capable of comparing enthalpy content (tem-
perature and humidity) of outdoor and indoor
air and controlling economizer cut-in point at
the most economical level.
*11. Electric Resistance Heaters:
a. Open wire nichrome elements with all neces-
sary safety operating controls.
b. UL listed and indicated on basic unit informa-
tive plate.
c. Available in multiples to match heating
requirements.
d. Single point kits available for each heater when
required.
*12. Head Pressure Control Packages:
Consists of solid-state control and outdoor-coil
temperature sensor to maintain condensing tem-
perature between 90 F and 110 F at outdoor
ambient temperatures down to –20 F by outdoor
fan speed modulation or outdoor fan cycling.
*13. Remote Control Panel:
Panel shall be a decorative, indoor, wall-mounted
panel consisting of:
a. Two-stage heat/2-stage cool thermostat.
b. Automatic changeover.
c. System switch with HEAT-COOL-AUTO.-OFF
settings.
d. Fan switch with ON-AUTO. settings.
e. Ventilation control for remote variation of the
amount of outdoor-air intake.
f. Indicator lights
operation.
g. Three unused indicator lights for field use.
*14. Thermostat and Subbase:
Provides staged cooling and heating automatic (or
manual) changeover, fan control, and indicator
light.
15. Thru-The-Bottom Service Connections:
Kit shall provide connectors to permit electrical
connections to be brought to the unit through the
basepan.
*16. Electronic Programmable Thermostat:
Capable of using deluxe full-featured electronic
thermostat. Shall use built-in compressor cycle
delay control for both heating and cooling duty.
Capable of working with Carrier direct digital
controls.
17. Light Commercial Thermidistat:
Shall regulate temperature and humidity from one
location. Automatic humidity control adjusts
indoor humidity based on the outdoor tempera-
ture sensor.
for HEAT-COOL-FAN
18. Outdoor Coil Hail Guard Assembly:
Hail guard shall protect against damage from hail
and flying debris.
19. Alternate Motors and/or Drives (004-006, 008,
012):
Alternate motors and drives shall be factory-
installed to provide additional performance range.
20. High-Static Motor(s) and Drive(s) (50TFQ004-
012):
High-static motor(s) and drive(s) shall be factory-
installed to provide an additional performance
range.
21. Outdoor Coil Grille:
The grille protects the outdoor coil from damage
by large objects
clearances.
22. Compressor Cycle Delay:
Unit shall be prevented from restarting for a mini-
mum of 5 min. after shutdown.
23. Salt Spray Protection Package (008-012):
Coil guard protects coil from corrosion in coastal
areas and in areas with high sulfur emissions.
24. Fan/Filter Status Switch:
Provides status of evaporator fan (ON/OFF) or fil-
ter (CLEAN/DIRTY). Status shall be displayed
over communication bus when used with direct
digital controls or with an indicator light at the
thermostat.
25. Unit Mounted Disconnect Switch:
Shall be factory-installed. Internally mounted,
NEC and UL approved non-fused switch provides
unit power shutoff. Shall be accessible from out-
side the unit.
26. Convenience Outlet:
Shall be factory-installed and internally mounted
with easily accessible 115-v female receptacle.
Shall include 15 amp GFI receptacle with inde-
pendent fuse protection. Voltage required to oper-
ate convenience outlet shall be provided by a
factory-installed step-down transformer. Shall be
accessible from outside the unit.
27. Emergency Heat Package:
When mechanical heating is locked out, auxiliary
heat shall be activated when necessary.
28. Logo Kit:
Shall be mounted on the outdoor coil grille.
29. EconoMi$er with Power Exhaust:
Provides control of internal building air pressure.
The system shall exhaust up to 100% of return air.
without increasing unit
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