Carrier WEATHERMASTER 48/50Z030-105 Operation And Service Manual

Also see for 48/50Z030-105: Installation instructions

Contents

Carrier WEATHERMASTER 48/50Z030-105 Operation And Service Manual Manual pdf 77 page image

77Table 60 — Humidity ConfigurationTable 61 — Related Humidity PointsOPERATION — For operation, PID control will be utilized.The process will run at the rate defined by the Configuration→HUMD→H.PID→HM.TM. The first part of humiditycontrol tests the humidity control configuration and will turnon corresponding configurations to read space or return air rel-ative humidity. If the supply fan has been ON for 30 secondsand the space is occupied, then the humidification is started.Actuator Control — Control is performed with a generic PIDloop where:Error = HM.SP – humidity sensor value (SP.RH or RA.RH,depending on configuration).The PID terms are calculated as follows:P = K * HM.P * errorI = K * HM.I * error + “I” last time throughD = K * HM.D * (error – error last time through)Where K = HM.TM/60 to normalize the effect of changing therun time rateRelay Output Control — If the humidity sensor reading isgreater than the humidity set point then the humidity relay(Outputs→GEN.O→HUM.R) is closed. The relay will openwhen the humidity is 2% less than the humidity set point.CONFIGURING THE HUMIDIFIER ACTUATOR —Every actuator used in the Z Series control system has its ownunique serial number. The rooftop control uses this serialnumber to communicate with the actuator over the local equip-ment network (LEN). The actuator serial number is located ona two-part sticker affixed to the side of the actuator housing.Remove one of the actuator’s serial number labels and paste itonto the actuator serial number records label located insidethe left-hand access panel at the unit’s control panel. Fiveindividual numbers make up this serial number. Program theserial number of the actuator in its Humidifier ActuatorConfigurations group, ACT.C (SN.1, SN.2, SN.3, SN.4, SN.5)NOTE: The serial numbers for all LEN actuators can be foundinside the control doors of the unit as well as on the actuatoritself. If an actuator is replaced in the field, it is a good idea toremove the additional peel-off serial number sticker on theactuator and cover up the old one inside the control doors.Control Angle Alarm (Configuration→HUMD→ACTC→C.A.LM) — The humidifier actuator learns what its end stopsare though a calibration at the factory. Field-installed actuatorsmay be calibrated in the Service Test mode. When an actuatorlearns its end stops through calibration, it determines its controlangle. The actuator will resolve this control angle and expressits operation in a percent (%) of this learned range.If the humidifier actuator has not learned a sufficient controlangle during calibration, the actuator will be unable to controlhumidity. For this reason, the humidifier actuator has a config-urable control angle alarm low limit (C.A.LM). If the controlangle learned through calibration is less than C.A.LM, an alertwill occur and the actuator will not function.NOTE: This configuration does not typically need adjustment.It is configurable for the small number of jobs which mayrequire a custom solution or workaround.Dehumidification and Reheat — 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. ACEM (option or accessory) is required to accommodate an RH(relative humidity) sensor connection. Reheat is possible whenmultiple-step staged gas control option or hydronic heat (op-tion or field-installed coil) is installed. Reheat is also possibleusing a heat reclaim coil (field-supplied and installed) or a hotgas reheat coil (special order, factory-installed).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 commercial Thermidistat™ deviceis the recommended accessory device.SETTING UP THE SYSTEM — The settings for dehumidi-fication can be found at the local display at Configuration→DEHU. See Table 62.Dehumidification Configuration (D.SEL) — The dehumidi-fication configuration can be set for the following settings:• D.SEL = 0 — No dehumidification and reheat.ITEM EXPANSION CCN POINT RANGE UNITS DEFAULTHUMD HUMIDITY CONFIGURATIONHM.CF Humidifier Control Cfg. HUMD_CFG 0 - 4 0HM.SP Humidifier Setpoint HUSP 0 - 100 % 40H.PID HUMIDIFIER PID CONFIGSHM.TM Humidifier PID Run Rate HUMDRATE 10 - 120 sec 30HM.P Humidifier Prop. Gain HUMID_PG 0 - 5 1HM.I Humidifier Integral Gain HUMID_IG 0 - 5 0.3HM.D Humidifier Deriv. Gain HUMID_DG 0 - 5 0.3ACT.C HUMIDIFIER ACTUATOR CFGSSN.1 Humd Serial Number 1 HUMD_SN1 0 - 255 0SN.2 Humd Serial Number 2 HUMD_SN2 0 - 255 0SN.3 Humd Serial Number 3 HUMD_SN3 0 - 255 0SN.4 Humd Serial Number 4 HUMD_SN4 0 - 255 0SN.5 Humd Serial Number 5 HUMD_SN5 0 - 255 0C.A.LM Humd Ctrl Angle Lo Limit HUMDCALM 0-90 85ITEM EXPANSION UNITS CCN POINT WRITE STATUSConfig→UNIT→SENS→SRH.S Space Air RH Sensor SPRHSENSConfig→UNIT→SENS→RRH.S Return Air RH Sensor RARHSENSInputs→REL.H→RA.RH Return Air Rel. Humidity % RARH forcibleInputs→REL.H→SP.RH Space Relative Humidity % SPRH forcibleOutputs→ACTU→HMD.P Humidifier Act.Curr.Pos. % HUMDRPOSOutputs→ACTU→HMD.C Humidifier Command Pos. % HUMDCPOSOutputs→GEN.O→HUM.R Humidifier Relay HUMIDRLY