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g
-_RA -_ PU._
FU-
PLHO _-
i
INSTALLED
Fig. 22 - EconoMi$er
IV Wiring
C06332
Table 7 - EconoMi$er
IV Sensor
Usage
APPLICATION
Outdoor Air Dry Bulb
Differential
Dry Bulb
Single Enthalpy
Differential
Enthalpy
CO2 for DCV Control using a
Wall-Mounted
CO 2 Sensor
CO2 for DCV Control using a
Duct-Mounted
CO 2
Sensor
ECONOMISER
IV WITH OUTDOOR AIR
DRY BULB SENSOR
Accessories
Required
None. The outdoor air dry bulb
sensor is factory installed.
CRTEMPSNOO2AO0*
HH57AC078
HH57AC078
and
CRENTDIF004A00*
33ZCSENC02
33ZCSENCO21-
and
O
CRCBDIOX005A001-1-
33ZCASPC02**
ECONOMISER
IV WITH SINGLE
ENTHALPY SENSOR
Accessories
Required
CRTEMPSNOO2AO0*
(2) CRTEMPSNOO2AO0*
None. The single enthalpy sensor is
factory installed.
CRENTDIFOO4AO0*
33ZCSENC02
33ZCSENCO21-
and
O
CRCBDIOX005A001-1-
33ZCASPC02**
*CRENTDIF004A00
and CRTEMPSN002A00
accessories
are used on many different base units. As such, these kits may contain parts that will not be needed for
installation.
1-33ZCSENCO2
is an accessory
CO 2 sensor,
**33ZCASPCO2
is an accessory aspirator
box required for duct-mounted
applications.
1-1-CRCBDIOX005A00 is an accessory
that contains both 33ZCSENCO2
and 33ZCASPCO2
accessories.
To
determine
the
minimum
position
setting,
perform
the
following
procedure:
1. Calculate
the appropriate
mixed
air temperature
using
the
following
formula:
(To x OA) + (TR x RA) = TM
TO = Outdoor-Air
Temperature
OA = Percent
of Outdoor
Air
TR = Return-Air
Temperature
RA = Percent
of Return
Air
TM = Mixed-Air
Temperature
As an example,
if local codes require
10% outdoor
air during
occupied
conditions,
outdoor-air
temperature
is 60°F,
and
return-air
temperature
is 75 °F.
(60 x .10) + (75 x .90) = 73.5°F
2. Disconnect
the mixed
air sensor from terminals
T and T1.
3. Ensure
that the factory-installed
jumper
is in place across
terminals
P and PI. If remote
damper
positioning
is being
used,
make
sure that the terminals
are wired
according
to
Fig. 22 and that
the minimum
position
potentiometer
is
turned fully clockwise.
4. Connect
24 vac across terminals
TR and TRI.
5. Carefully
adjust the minimum
position
potentiometer
until
the
measured
mixed
air
temperature
matches
the
calculated
value.
6. Reconnect
the mixed
air sensor to terminals
T and TI.
Remote
control
of the EconoMi$er
IV damper
is desirable
when
requiring
additional
temporary
ventilation.
If
a
field-supplied
remote
potentiometer
(Honeywell
part
number
$963B1128)
is wired
to
the
EconoMi$er
IV
controller,
the
minimum
position
of the damper
can be controlled
from a remote
location.
30
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