United Technologies Carrier Weathermaker 48A2, Управление, пуск, эксплуатация, обслуживание и устранение неисправностей.

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Table 64 — Economizer Configuration Table
ECONOMIZER OPERATION CONFIGURATION — The
configuration items in the E.CFG menu group affect how
the economizer modulates when attempting to follow an
economizer cooling setpoint. Typically, they will not need
adjustment. In fact, it is strongly advised not to adjust these
configuration items from their default settings without first
consulting a service engineering representative.
In addition, the economizer cooling algorithm is designed to
automatically slow down the economizer actuator’s rate of
travel as outside air temperature decreases.
ECONOMIZER DIAGNOSTIC HELP — Because there are
so many conditions which might disable the economizer from
being able to provide free cooling, the control has a display
table to identify these potentially disabling sources. The user
can check ACTV , the “Economizer Active” flag. If this flag is
set to Yes there is no reason to check DISA (Economizer
Disabling Conditions). If the flag is set to No, this means that at
least one or more of the flags under the group DISA are set
to Yes and the user can discover what is preventing the econo-
mizer from performing free cooling by checking the table.
The economizer’s reported and commanded positions
are also viewable, as well as outside air temperature, relative
humidity, enthalpy and dew point temperature.
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
EC.EN Economizer Installed? Yes/No ECON_ENA Yes
EC.MN Economizer Min.Position 0 - 100 % ECONOMIN 5
EC.MX Economizer Max.Position 0 - 100 % ECONOMAX 98
EP.MS Economizer Position at Minimum VFD Speed 0 - 100 % EPOSMNFS 5
EP.XS Economizer Position at Maximum VFD Speed 0 - 100 % EPOSMXFS 5
E.TRM Economzr Trim For SumZ ? Yes/No ECONTRIM Yes
E.SEL
Econ ChangeOver Select 0 - 3 ECON_SEL 0
DDB.C
Diff Dry Bulb RAT Offset 0 - 3
dF
EC_DDBCO 0
OA.E.C OA Enthalpy ChgOvr Selct 1 - 5 OAEC_SEL 4
OA.EN Outdr.Enth Compare Value 18 - 32 OAEN_CFG 24
OAT.L High OAT Lockout Temp -40 - 120 dF OAT_LOCK 60
O.DEW OA Dewpoint Temp Limit 50 - 62 dF OADEWCFG 55
ORH.S Outside Air RH Sensor Enable/Disable OARHSENS Disable
E.TYP Economizer Control Type 1 - 3 ECON_CTL 1
EC.SW Economizer Switch Config 0 - 2 ECOSWCFG 0
E.CFG ECON.OPERATION CONFIGS
E.P.GN Economizer Prop.Gain 0.7 - 3.0 EC_PGAIN 1
E.RNG Economizer Range Adjust 0.5 - 5 ^F EC_RANGE 2.5
E.SPD Economizer Speed Adjust 0.1 - 10 EC_SPEED 0.75
E.DBD Economizer Deadband 0.1 - 2 ^F EC_DBAND 0.5
UEFC UNOCC.ECON.FREE COOLING
FC.CF Unoc Econ Free Cool Cfg 0-2 UEFC_CFG 0
FC.TM Unoc Econ Free Cool Time 0 - 720 min UEFCTIME 120
FC.L.O Un.Ec.Free Cool OAT Lock 40 - 70 dF UEFCNTLO 50
T.24.C TITLE 24 FDD
LOG.F Log Title 24 Faults Yes/No T24LOGFL No
EC.MD T24 Econ Move Detect 1 to 10 dF T24ECMDB 1
EC.ST T24 Econ Move SAT Test 10 to 20 % T24ECSTS 10
S.CHG T24 Econ Move SAT Change 0 to 5 dF T24SATMD 0.2
E.SOD T24 Econ RAT-OAT Diff 5 to 20 dF T24RATDF 15
E.CHD T24 Heat/Cool End Delay 0 to 60 min T24CHDLY 25
ET.MN T24 Test Minimum Pos. 0 to 50 % T24TSTMN 15
ET.MX T24 Test Maximum Pos. 50 to 100 % T24TSTMX 85
SAT.T SAT Settling Time 10 to 900 sec SAT_SET 240
Fig. 12 — Custom Changeover Curve Example
A48-7731