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Manufacturer reserves the right to discontinue, or change at any time, specications, designs and prices without notice and without incurring obligations.
Form No. 18476-2P
Copyright MicroMetl Corporation 2016 All rights reserved.
MicroMetl Indianapolis
3035 N. Shadeland Ave.,
Suite 300 Indianapolis, IN 46226
MicroMetl Longview
201 Kodak Blvd., Longview, Texas 75602
MicroMetl West201
905 Southern Way, Sparks, Nevada 89431
Component Description
1A. Siemens actuator ...9901-2497 provides 24v modulating
control of economizer damper, 20 in. lb. of torque,
1B. Siemens actuator ...9901-2498 provides 24v modulating
control of economizer damper, 35 in. lb. of torque.
2. Discharge sensor ...9901-0001 provides a signal (3000
Ohms at 25
O
C or 77
O
F) to the actuator during free cooling
or economizer mode. The signal opens the economizer
damper until the discharge temperature drops below 55
O
.
At this time the signal causes the motor to modulate the
damper and mix outside air with return air to maintain a 50
O
F to 56
O
F discharge temperature.
3. Economizer logic ...9901-1805 accepts input from discharge
sensor and outside air sensor. Analyzes input to control
actuator modulation and economizer switching. Logic
also houses minimum position adjustment, enthalpy or
adjustable dry bulb adjustment, power exhaust control, and
CO2 demand control ventilation adjustment. When used
with optional differential sensor in the return air, the logic is
capable of selecting the most economical air available for
cooling. (Honeywell W7212A 1009)
4A. Entahlpy sensor ...9901-0018 senses and combines
temperature and humidity of outdoor air. And also provides
the signal to the economizer logic. (Honeywell C7400A used
on 1008-0100)
4B. Adjustable dry bulb ...9901-2251 senses temperature
of outside air and provides signal to the economizer logic.
(Honeywell C7660A-1001 used on 1009-0100)
4C. Fixed dry bulb ...9901-0183 senses temperature of outside
air. If below 70
O
setpoint, allows for free cooling.
5. Wire harness color coded and pre-wired to actuator and
economizer logic.
6. Compressor lockout ...9901-0252 locks out compressor
when temperature falls below 35
O
F (+/- 5
O
F). Shipped with
economizer, but must be eld wired, if desired.
1A
1B
3
4C
6
5
4A
4B
2
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