Carrier WEATHERMASTER 50HJQ004-016 Product Data page 151

f. EconoMi$er IV and EconoMi$er2 shall be
equipped with a barometric relief damper
capable of relieving up to 100% return air.
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$er IV,
the return air sensor, indoor enthalpy sensor,
and outdoor enthalpy sensor shall be pro-
vided as field-installed accessories to provide
enthalpy control, differential enthalpy con-
trol, and differential dry bulb temperature
control. For the EconoMi$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$er IV damper shall be completely
closed when the unit is in the occupied
mode.
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n. EconoMi$er IV Microprocessor IAQ/DCV
Maximum Damper Position Setting — Set-
ting the maximum position of the damper
prevents the introduction of large amounts
of hot or cold air into the space. This posi-
tion 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).
sensor input.
2
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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.
4. 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.
* 5. 100% Two-Position Damper:
a. Two-position damper package shall include
single blade damper and motor. Admits up
to 100% outdoor air.
b. Damper shall close upon indoor (evaporator)
fan shutoff.
c. Designed to close damper during loss of
power situations.
d. Equipped
damper.
* 6. 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.
* 7. 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.
8. 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.
d. Single point kits available for each heater
when required.
905
with 15% barometric relief
151