Carrier WEATHERMAKER 48J Started Manual

Also see for 48AJ: Installation, Start-Up and Service Instructions Installation instructions Operation and service guide Operating and service guide

IAO Econo Override Pos (Configuration-+IAQ-+AQ.SP-+-- This configuration is the position that the econo-mizer goes to when override is in effect.Diff. Air Quality Lo Limit (Configuration--+IAQ--+AQ.SP-+DAQ.L) -- This is the differential CO2 level at which IAQcontrol of the dampers will be initiated.Diff. Air Quality Hi Limit (Configuration-+IAQ-+AQ.SP-+DAQ.H) -- This is the differential CO 2 level at which IAQcontrol of the dampers will be at maximum and the damperswill be at the Configuration-+IAQ-+DCV..C-+EC.MN.DAQ ppm Fan Off Set Point (Con.figuration-+IAQ-+AQ.SP-+D.EOF) -- This is the CO 2 level at which theindoor fan will be turned off.DAQ ppm Fan On Set Point (Configuration--+IAQ--+AQ.SP--+D.EON) -- This is the CO2 level at whichthe indoor fan will be turned on.Diff. IAQ Responsiveness (Con.figuration-+IAQ-+AQ.SP-+IAQ.R) -- This is the configuration that is used to select theIAQ response curves as shown in Fig. 13.OAQ Lockout Value (Con.figuration-+IAQ-+AQ.SP-+OAQ.L) -- This is the maxhnum OAQ level above which de-mand ventilation will be disabled.User Determined OAQ (Con.figuration-+IAQ--)AQ.SP-+OAQ.U) -- If an OAQ sensor is unavailable, the user canmanually set the OAQ reading.IAQ Low Reference (Con.figuration---_IAQ---_AQ.S.R---_!Q.R.L) -- This is the reference that will be used with anon-Carrier IAQ sensor that may have a different characteristiccurve. It represents the CO2level at 4 mA.IAQ High Reference (Con.figuration --_IAQ---_AQ.S.R-+IQ.R.H) -- This is the reference that will be used with anon-Carrier IAQ sensor that may have a different characteristiccurve. It represents the CO2level at 20 mA.OAQ Low Reference ((bnfiguration---_IAQ---_AQ.S.R_OQ.R.L) -- This is the reference that will be used with anon-Carrier OAQ sensor that may have a different characteris-tic curve. It represents the CO2 level at 4 mA.OAQ High Reference (Con.figuration---_IAQ---_AQ.S.R---_OQ.R.H) -- This is the reference that will be used with a non-Carrier OAQ sensor that may have a different characteristiccurve. It represents the CO2 level at 20 mA.PRE-OCCUPANCY PURGE- The control has the optionfor a pre-occupancy purge to refresh the air in the space prior tooccupancy.This feature is enabled by setting (bnfiguration-+IAQ-+IAQ.P-+IQ.PG to Yes.The IAQ purge will operate under the following conditions:• IQ.PG is enabled• the unit is in the unoccupied state• Current Time is valid• Next Occupied Time is valid• time is within two hours of the next occupied period• time is within the purge duration (Configuration-+IA Q--+IAQ.P--+IQ.R I)If all of the above conditions are met, the following logic isused:If OAT > IQ.L.O and OAT < OCSP and economizer isavailable then purge will be enabled and the economizer willbe colmnanded to 100%.If OAT < IQ.L.O then the economizer will be positioned tothe IAQ Purge LO Temp Min Pos ((bnfiguration--+IAQ--+IAQ.P--+IQ.RL )If neither of the above are true then the dmnpers will bepositioned to the IAQ Purge HI Temp Min PUs ((bnfiguration--+IAQ--+IAQ.P--+IQ.P.H)If this mode is enabled the indoor fan and heat interlockrelay (VAV) will be energized.IAQ Purge (Configuration --+IA Q -+ IA Q.P --+IQ.PG) --This is used to enable IAQ pre-occupancy purge.IAQ Purge Duration (Con.figuration--+IAQ--+IAQ.P--+-- This is the maximum amount of time that a purgecall occur.IAQ Purge Lo Temp Min Pos (Configuration-+IAQ-+IAQ.P-+IQ.RL) -- This is used to configure a low limit fordamper position to be used during the purge mode.IAQ Purge Hi Temp Min Pos (Configuration-+IAQ-+IAQ.P-+IQ.RH) -- This is used to configure a maximum po-sition for the dampers to be used during the purge cycle.IAQ Purge OAT Lockout Temp (Configuration-+IAQ-+IAQ.P-+IQ.L.O) --Nightthne lockout temperature belowwhich the purge cycle will be disabled.Dehumidification and Reheat E The Dehumidifi-cation function will override comfort condition set pointsbased on dry bulb temperature and deliver cooler air to thespace in order to satisfy a humidity set point at the space orreturn air humidity sensor. The Reheat function will energize asuitable heating system concurrent with dehumidificationsequence should the dehumidification operation result inexcessive cooling of the space condition.The dehumidification sequence requires the installation of aspace or return air humidity sensor or a discrete switch input.An ECB option is required to accolmnodate an RH (relativehumidity) sensor connection. A CEM (option or accessory) isrequired to accomodate an RH switch. Reheat is possible whenmultiple-step staged gas control option or hydronic heat field-installed coil is installed. Reheat is also possible using a heatreclahn coil (field-supplied and installed) or a DX (direct ex-pansion) reheat coil.Dehumidification and reheat control are allowed duringCooling and Vent modes in the Occupied period.On constant volume units using thermostat inputs (C TYP =3 or 4), the discrete switch input must be used as the dehumidi-fication control input. The colrnnercial Thermidistat TM deviceis the recolmnended accessory device.SETTING UP THE SYSTEM -- The settings for dehumidi-fication can be found at the local display at Configuration-+DEHU. See Table 85.Dehumidification Configuration (D.SEL) -- The dehumidi-fication configuration can be set for the following settings:• D.SEL = 0 -- No dehumidification and reheat.• D.SEL = 1 -- The control will perform dehumidificationand reheat with staged gas only.• D.SEL = 2 -- The control will perform both dehumidifi-cation and reheat with third party heat via an alarm relay.In the case of D.SEL=2, during dehumidification, thealarm relay will close to convey the need for reheat. Atypical application might be to energize a 3-way valve toperform DX reheat.Dehumidification Sensor (D.SEN) -- The sensor can be con-figured for the following settings:• D.SEN = 1 -- Initiated by return air relative humiditysensor.• D.SEN = 2 -- Initiated by discrete input.Economizer Disable in Dehum Mode (D.E(:D) -- Thisconfiguration determines economizer operation during Dehu-midification mode.• D.E(:D = YES -- Economizer disabled during dehu-midification (default).• D.E(:D = NO -- Economizer not disabled during dehu-midification.69