Carrier WEATHERMASTER 50HJQ004-016 Product Data page 157

b. Available as a factory-installed option in ver-
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tical supply/return configuration only. (Avail-
able as a field-installed accessory for
dedicated horizontal and/or vertical supply
return configurations.)
c. Includes all hardware and controls to provide
cooling with outdoor air.
d. Equipped with low-leakage dampers, not to
exceed 2% leakage at 1 in. wg pressure
differential.
e. Capable of introducing up to 100% outdoor
air.
f. EconoMi$er IV and EconoMi$er2 shall be
equipped with a barometric relief damper.
g. Designed to close damper(s) during loss-of-
power situations with spring return built into
motor.
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h. Dry bulb outdoor-air temperature sensor
shall be provided as standard. Outdoor air
sensor set point is adjustable and shall range
from 40 to 100 F. For the EconoMi$er IV,
the return air sensor, indoor humidity sensor,
and outdoor humidity sensor shall be pro-
vided as field-installed accessories to provide
enthalpy control, differential enthalpy con-
trol, and differential dry bulb temperature
control. For the EconoMi$er2, the enthalpy,
differential temperature (adjustable), and dif-
ferential enthalpy control shall be provided
as field-installed accessories.
i. The EconoMi$er IV and EconoMi$er2 shall
have a gear-driven parallel blade design.
j. EconoMi$er IV microprocessor control shall
provide control of internal building pressure
through its accessory power exhaust func-
tion. Factory set at 100%, with a range of
0% to 100%.
k. EconoMi$er2 shall be capable of control
from a 4 to 20 mA signal through optional
4 to 20 mA design without microprocessor
control (required for PremierLink™ or third
party control interface).
l. EconoMi$er IV Microprocessor Occupied
Minimum Damper Position Setting main-
tains the minimum airflow into the building
during occupied period providing design
ventilation rate for full occupancy (damper
position during heating). A remote potenti-
ometer may be used to override the set
point.
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m. EconoMi$er IV Microprocessor Unoccupied
Minimum Damper Position Setting — The
EconoMi$er IV dampers shall be completely
closed when the unit is in the occupied
mode.
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n. EconoMi$er2
Damper Position Setting — Setting the max-
imum position of the damper prevents the
Microprocessor Maximum
introduction of large amounts of hot or cold
air into the space. This position is intended
to satisfy the base minimum ventilation rate.
o. EconoMi$er IV Microprocessor IAQ/DCV
control modulates the outdoor-air damper to
provide ventilation based on the optional 2
to 10 vdc CO
p. Compressor lockout sensor (opens at 35 F,
closes at 50 F).
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q. Actuator shall be direct coupled to economizer
gear, eliminating linkage arms and rods.
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r. Control LEDs:
1) When the outdoor-air damper is capable
of providing free cooling, the "Free
Cool" LED shall illuminate.
2) The IAQ LED indicates when the mod-
ule is on the DCV mode.
3) The EXH LED indicates when the
exhaust fan contact is closed.
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s. Remote Minimum Position Control — A
field-installed accessory remote potentiome-
ter shall allow the outdoor-air damper to be
opened or closed beyond the minimum
position in the occupied mode for modified
ventilation.
5. Barometric Relief Damper:
a. Package shall include damper, seals, hard-
ware, and hoods to relieve excess internal
pressure.
b. Damper shall close due to gravity upon unit
shutdown.
6. Manual Outdoor-Air Damper:
Manual damper package shall consist of
damper, birdscreen, and rainhood which can be
preset to admit up to 50% outdoor air for year
round ventilation.
* 7. 25% Two-Position Damper:
a. Two-position damper package shall include
single blade damper and motor. Admits up
to 25% outdoor air.
b. Damper shall close upon indoor fan shutoff.
* 8. Head Pressure Control Package:
Control package shall consist of solid-state con-
trol and condenser-coil temperature sensor to
maintain condensing temperature between 90 F
and 110 F at outdoor ambient temperatures
down to –20 F by condenser-fan speed modula-
tion or condenser-fan cycling and wind baffles.
9. Electric Resistance Heaters:
a. Open wire nichrome elements with all nec-
essary safety operating controls.
b. UL listed and indicated on basic unit infor-
mation plate.
c. Available in multiples to match heating
requirements.
905
sensor input.
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