ITEM
EC.EN
EC.MN
EC.MX
E.TRM
E. SEL
OA.E.C
OA.EN
OAT.L
O.DEW
ORH.S
E. TYP
EC.SW
E. CFG
E.P.GN
E.RNG
E.SPD
E.DBD
UEFC
FC.CF
FC. TM
FC.L.O
Table 79 -- Economizer Configuration Table
EXPANSION
Economizer Installed?
Economizer Min.Position
Economizer Max.Position
Economzr Trim For SumZ ?
Econ ChangeOver Select
OA Enthalpy ChgOvr Selct
Outdr.Enth Compare Value
High OAT Lockout Temp
OA Dewpoint Temp Limit
Outside Air RH Sensor
Economizer Control Type
Economizer Switch Config
ECON.OPERATION CONFIGS
Economizer Prop.Gain
Economizer Range Adjust
Economizer Speed Adjust
Economizer Deadband
UNOCC.ECON.FREE COOLING
Unoc Econ Free Cool Cfg
Unoc Econ Free Cool Time
Un.Ec.Free Cool OAT Lock
RANGE
Yes/No
O- 100
O- 100
Yes/No
0-3
1-5
18 - 28
-40 - 120
50 - 62
Enable/Disable
1-3
0-2
0.7 - 3.0
0.5- 5
0.1 - 10
0.1 -2
0-2
0 - 720
40 - 70
%
%
I
d?
UNITS CCN POINT
ECON ENA
ECONOMIN
ECONOMAX
ECONTRIM
ECON SEL
OAEC SEL
OAEN CFG
OAT LOCK
OAD-EWC FG
OARHSENS
ECON CTL
ECOS_/CFG
EC PGAIN
EC RANGE
EC SPEED
EC DBAND
UEFC CFG
UEFCTIME
UEFCNTLO
DEFAULT
Yes
5
98
Yes
0
4
24
60
55
Disable
g
1
2.5
0.75
0.5
o
12o
5o
Custom Psychrometric Curves -- Refer to the psychrometric
chart and the standard Honeywell A-D curves in Fig. 10. The
curves start from the bottom and rise vertically, angle to the left
and then fold over. This corresponds to the limits imposed by
dry bulb changeover, outdoor enthalpy changeover and
outdoor dewpoint limiting respectively. Therefore, it is now
possible to create any curve desired with the addition of one
outdoor relative humidity sensor and the options for
changeover now available. See Fig. 11 for an example of a
custom curve constructed on a psychrometric chart.
UNOCCUPIED ECONOMIZER FREE COOLING -- This
Free Cooling function is used to start the supply fan and use
the economizer to bring in outside air when the outside
temperature is cool enough to pre-cool the space. This is done
to delay the need for mechanical cooling when the system
enters the occupied period. This function requires the use of a
space temperature sensor.
When configured, the economizer will modulate during an
unoccupied period and attempt to maintain space temperature
to the occupied cooling set point. Once the need for cooling has
been satisfied during this cycle, the fan will be stopped.
Configuring the economizer for Unoccupied Economizer
Free Cooling is done in the UEFC group. There are three
configuration options, FC CF, FC TM and FCLO.
Unoccupied Economizer Free Cooling Configuration
(F(2:CF) -- This option is used to configure the type of unoc-
cupied economizer free cooling control that is desired.
0 = disable unoccupied economizer free cooling
1= perform unoccupied economizer free cooling as available
during the entire unoccupied period.
2 = perform unoccupied economizer free cooling as available,
FC TM minutes before the next occupied period.
Unoccupied Economizer Free Coolin_ Time Configuration
(FC TM) -- This option is a configurable time period, prior to
the next occupied period, that the control will allow unoccu-
pied economizer free cooling to operate. This option is only
applicable when FCCF = 2.
IC°,,"mC°;"t
Outside Enthalpy]
Changeover I
default 24,0 J
De.point
default 55.0dF
[]
[]
Fig. 11 -- Custom Changeover Curve Example
62
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