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 76 page image

76OAQ Low Reference (Configuration→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 (Configuration→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 4 mA.Diff. IAQ Responsiveness (Configuration→IAQ→AQ.SP→IAQ.R) — This is the configuration that is used to select theIAQ response curves as shown in Fig. 12.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 Configuration→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→IAQ→IAQ.P→IQ.P.T)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 economizerwill be commanded to 100%.Else, if OAT < IQ.L.O then the economizer will be posi-tioned to the IAQ Purge LO Temp Min Pos (Configuration→IAQ→IAQ.P→IQ.P.L)If neither of the above are true then the dampers will bepositioned to the IAQ Purge HI Temp Min Pos (Configuration→IAQ→IAQ.P→IQ.P.H)If this mode is enabled the indoor fan and heat interlockrelay (VAV) will be energized.IAQ Purge (Configuration→IAQ→IAQ.P→IQ.PG) — Thisis used to enable IAQ pre-occupancy purge.IAQ Purge Duration (Configuration→IAQ→IAQ.P→IQ.P.T) — This is the maximum amount of time that a purgecan occur.IAQ Purge Lo Temp Min Pos (Configuration→IAQ→IAQ.P→IQ.P.L) — 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.P.H) — 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) — Nighttime lockout temperature belowwhich the purge cycle will be disabled.OPTIONAL AIRFLOW STATION — The ComfortLink™controls are capable of working with a factory-installed option-al airflow station that measures the amount of outdoor air enter-ing the economizer. This flow station is intended to measureventilation airflows and has a limitation as to the maximumflow rate it can measure. The limits are 18,000 cfm for sizes030-050 and 31,000 cfm for sizes 055-105.All configurations for the outdoor airflow station can befound in the Configuration→ECON→CFM.C, sub-menu.For this algorithm to function, the Outdoor Air Cfm SensorConfiguration (OCF.S.) must be enabled.There are three set point configurations:O.C.MN — Econ OACFM DCV Min FlowO.C.MX — Econ OACFM DCV Max FlowO.C.DB — Econ OACFM MinPos DeadbdWhen the outdoor air cfm sensor is enabled, the EconomizerMin.Position (Configuration→IAQ→DCV.C→EC.MN) andthe IAQ Demand Vent Min.Pos (Configuration→IAQ→DCV.C→IAQ.M) will no longer be used. During vent periods,the control will modulate the damper to maintain the outdoorair intake quantity between O.C.MX and O.C.MN. The indoorair quality algorithm will vary the cfm between these twovalues depending on Configuration→IAQ→AQ.SP→DAQ.Land the Configuration→IAQ→AQ.SP→DAQ.H set pointsand upon the relationship between the IAQ and the outdoor airquality (OAQ).The economizer’s OA CFM Minimum Position Deadband(O.C.DB) is the deadband range around the outdoor cfmcontrol point at where the damper control will stop, indicatingthe control point has been reached. See the Economizer sectionfor more information.Humidification — The Z Series ComfortLink controlscan control a field-supplied and installed humidifier device.The ComfortLink controls provide two types of humidificationcontrol: A discrete stage control (via a relay contact) and a pro-portional control type (communicating to a LEN actuator). Thediscrete stage control is used to control a single-stage humidifi-er, (typically a spray pump). The proportional control type istypically used to control a proportional steam valve serving asteam grid humidifier.The ComfortLink controls must be equipped with a controlsexpansion module and an accessory space or return air relativehumidity sensor.If a humidifier using a proportional steam valve is selected,the Carrier LEN actuator (Carrier Part No. HF23BJ049) mustbe adapted to the humidifier manufacturer’s steam valve. Con-tact Belimo Aircontrols for information on actuator linkageadapter packages required to mount the LEN actuator on thespecific brand and type of steam valve mounted by the humidi-fier manufacturer.The LEN actuator address must be programmed into theComfortLink unit’s humidifier actuator serial number variables.NOTE: If the unit has the IGV option installed, it will be nec-essary to fabricate a LEN harness extension to connect thehumidifier LEN actuator to the unit’s LEN harness.SETTING UP THE SYSTEM — These humidity configura-tion are located in the local displays under Configuration→HUMD. See Table 60. Related points are shown in Table 61.Humidifier Control Configuration (HM.CF) — The humidi-fier control can be set to the following configurations:• HM.CF = 0 — No humidity control.• HM.CF = 1 — Discrete control based on space relativehumidity.• HM.CF = 2 — Discrete control based on return air rela-tive humidity.• HM.CF = 3 — Analog control based on space relativehumidity.• HM.CF = 4 — Analog control based on return air rela-tive humidity.Humidity Control Set Point (HM.SP) — The humidity con-trol set point has a range of 0 to 100%.Humidifier PID Run Rate (HM.TM) — This is the PID runtime rate.Humidifier Proportional Gain (HM.P) — This configurationis the PID Proportional Gain.Humidifier Integral Gain (HM.I) — This configuration is thePID Integral Gain.Humidifier Derivative Gain (HM.D) — This configuration isthe PID Derivative Gain.