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Controls, Start-Up, Operation, Service and ... - Climayoreo

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sensor are present. See Economizer Changeover Select section<br />

below for further information.<br />

ECONOMIZER CHANGEOVER SELECT (E.SEL) — The<br />

control is capable of performing any one of the following<br />

changeover types in addition to both the dry bulb lockout <strong>and</strong><br />

the st<strong>and</strong>ard external input:<br />

E.SEL = 0 none<br />

E.SEL = 1 Differential Dry Bulb Changeover<br />

E.SEL = 2 Outdoor Enthalpy Changeover<br />

E.SEL = 3 Differential Enthalpy Changeover<br />

Differential Dry Bulb Changeover — As both return air <strong>and</strong><br />

outside air temperature sensors are installed as st<strong>and</strong>ard on<br />

these units, the user may select this option, E.SEL = 1, to<br />

perform a qualification of return <strong>and</strong> outside air in the enabling/<br />

disabling of free cooling. If this option is selected <strong>and</strong> outsideair<br />

temperature is greater than return-air temperature, free<br />

cooling will not be allowed.<br />

Outdoor Enthalpy Changeover — This option should be used<br />

in climates with higher humidity conditions. The P Series<br />

control can use an enthalpy switch or enthalpy sensor, or the<br />

st<strong>and</strong>ard installed outdoor dry bulb sensor <strong>and</strong> an accessory<br />

relative humidity sensor to calculate the enthalpy of the air.<br />

Setting ConfigurationECONE.SEL = 2 requires that<br />

the user configure ConfigurationECONOA.E.C, the<br />

Outdoor Enthalpy Changeover Select, <strong>and</strong> install an outdoor<br />

relative humidity sensor. A control expansion module (CEM)<br />

is required. Once the sensor <strong>and</strong> board are installed, enable<br />

ConfigurationECONORH.S, the outdoor relative humidity<br />

sensor configuration option. This will automatically enable<br />

the CEM board, if it is not enabled already.<br />

If the user selects one of the Honeywell curves, A,B,C or D,<br />

then OA.E.C options 1-4 should be selected. See Fig. 13 for a<br />

diagram of these curves on a psychrometric chart.<br />

OA.E.C = 1 Honeywell A Curve<br />

Table 54 — Economizer Configuration Table<br />

68<br />

OA.E.C = 2 Honeywell B Curve<br />

OA.E.C = 3 Honeywell C Curve<br />

OA.E.C = 4 Honeywell D Curve<br />

OA.E.C = 5 custom enthalpy curve<br />

If the user selects OA.E.C = 5, a direct compare of outdoor<br />

enthalpy versus an enthalpy set point is done. This outdoor<br />

enthalpy set point limit is configurable, <strong>and</strong> is called<br />

ConfigurationECONOA.EN.<br />

Depending on what ConfigurationECONOA.E.C is<br />

configured for, if the outdoor enthalpy exceeds the Honeywell<br />

curves or the outdoor enthalpy compare value (Configuration<br />

ECONOA.EN), then free cooling will not be allowed.<br />

NOTE: If the user wishes to disable the st<strong>and</strong>ard enthalpy<br />

control from running concurrently, a field-supplied jumper<br />

must be installed between TB201 terminals 5 <strong>and</strong> 6.<br />

Differential Enthalpy Changeover — This option compares<br />

the outdoor-air enthalpy to the return air enthalpy <strong>and</strong> chooses<br />

the option with the lowest enthalpy. This option should be<br />

used in climates with high humidity conditions. This option<br />

uses both humidity sensors <strong>and</strong> dry bulb sensors to calculate<br />

the enthalpy of the outdoor <strong>and</strong> return air. An accessory<br />

outdoor air humidity sensor (ORH.S) <strong>and</strong> return air humidity<br />

sensor (RRH.S) are used. The outdoor air relative humidity<br />

sensor config (ORH.S) <strong>and</strong> return air humidity sensor config<br />

(ConfigurationSENSRRH.S) must be enabled.<br />

M3<br />

M2<br />

M1<br />

Fig. 10 — Enthalpy Switch Jumper Positions<br />

ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT<br />

EC.EN Economizer Installed? Yes/No ECON_ENA Yes<br />

EC2.E Econ.Act.2 Installed? Yes/No ECON_TWO No<br />

EC.MN Economizer Min.Position 0 - 100 % ECONOMIN 5<br />

EC.MX Economizer Max.Position 0 - 100 % ECONOMAX 98<br />

E.TRM Economzr Trim For SumZ ? Yes/No ECONTRIM Yes<br />

E.SEL Econ ChangeOver Select 0 - 3 ECON_SEL 0<br />

OA.E.C OA Enthalpy ChgOvr Selct 1 - 5 OAEC_SEL 4<br />

OA.EN Outdr.Enth Compare Value 18 - 28 OAEN_CFG 24<br />

OAT.L High OAT Lockout Temp -40 - 120 dF OAT_LOCK 60<br />

O.DEW OA Dewpoint Temp Limit 50 - 62 dF OADEWCFG 55<br />

ORH.S Outside Air RH Sensor Enable/Disable OARHSENS Disable<br />

CFM.C OUTDOOR AIR CFM CONTROL<br />

OCF.S Outdoor Air CFM Sensor Enable/Disable OCFMSENS Disable<br />

O.C.MX Economizer Min.Flow 0 - 20000 CFM OACFMMAX 2000<br />

O.C.MN IAQ Dem<strong>and</strong> Vent Min.Flow 0 - 20000 CFM OACFMMIN 0<br />

O.C.DB Econ.Min.Flow Deadb<strong>and</strong> 200 - 1000 CFM OACFM_DB 400<br />

E.CFG ECON.OPERATION CONFIGS<br />

E.P.GN Economizer Prop.Gain 0.7 - 3.0 EC_PGAIN 1<br />

E.RNG Economizer Range Adjust 0.5 - 5 ^F EC_RANGE 2.5<br />

E.SPD Economizer Speed Adjust 0.1 - 10 EC_SPEED 0.75<br />

E.DBD Economizer Deadb<strong>and</strong> 0.1 - 2 ^F EC_DBAND 0.5<br />

UEFC UNOCC.ECON.FREE COOLING<br />

FC.CF Unoc Econ Free Cool Cfg 0-2 UEFC_CFG 0<br />

FC.TM Unoc Econ Free Cool Time 0 - 720 min UEFCTIME 120<br />

FC.L.O Un.Ec.Free Cool OAT Lock 40 - 70 dF UEFCNTLO 50<br />

ACT.C ECON.ACTUATOR CONFIGS<br />

SN.1.1 Econ Serial Number 1 0 - 9999 ECON_SN1 0<br />

SN.1.2 Econ Serial Number 2 0 - 6 ECON_SN2 0<br />

SN.1.3 Econ Serial Number 3 0 - 9999 ECON_SN3 0<br />

SN.1.4 Econ Serial Number 4 0 - 254 ECON_SN4 0<br />

C.A.L1 Econ Ctrl Angle Lo Limit 0 - 90 ECONCALM 85<br />

SN.2.1 Econ 2 Serial Number 1 0 - 9999 ECN2_SN1 0<br />

SN.2.2 Econ 2 Serial Number 2 0 - 6 ECN2_SN2 0<br />

SN.2.3 Econ 2 Serial Number 3 0 - 9999 ECN2_SN3 0<br />

SN.2.4 Econ 2 Serial Number 4 0 - 254 ECN2_SN4 0<br />

C.A.L2 Econ 2 Ctrl Angle Lo Limit 0 - 90 ECN2CALM 85<br />

OFF<br />

100%<br />

50%<br />

0%

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