Carrier AQUAZONE 50PCH Installation And Service Instructions Manual

Also see for AQUAZONE 50PCH: Installation, Start-Up and Service Instructions Installation and service instructions Installation, Start-Up and Service Instructions

34optional CO2 IAQ (indoor air quality) sensor mounted in thespace can maximize the occupant comfort. The WSHP Opencontroller has its own hardware clock that is automatically setwhen the heat pump software is downloaded to the board. Oc-cupancy types are described in the scheduling section below.The following sections describe the functionality of the WSHPOpen multi-protocol controller. All point objects referred to inthis sequence of operation will be referenced to the objects asviewed in the BACview6 handheld user interface.SCHEDULING — Scheduling is used to start/stop the unitbased on a time period to control the space temperature to spec-ified occupied heating and cooling set points. The controller isdefaulted to control by occupied set points all the time, until ei-ther a time schedule is configured with BACview6, Field Assis-tant, i-Vu® Open, or a third party control system to enable/dis-able the BAS (Building Automation System) on/off point. Thelocal time and date must be set for these functions to operateproperly. The occupancy source can be changed to one of thefollowing:Occupancy Schedules — The controller will be occupied 24/7until a time schedule has been configured using either FieldAssistant, i-Vu Open, BACview6 or a third party control systemto enable/disable the BAS on/off point. The BAS point can bedisabled by going to Config, then Unit, then Occupancy Sched-ules and changing the point from enable to disable then click-ing OK.NOTE: This point must be enabled in order for the i-Vu Open,Field Assistant, or BACview6 control system to assign a timeschedule to the controller.Schedule_schedule — The unit will operate according to theschedule configured and stored in the unit. The schedule isaccessible via the BACview6 Handheld tool, i-Vu Open, orField Assistant control system. The daily schedule consists of astart/stop time (standard or 24-hour mode) and seven days ofthe week, starting with Monday and ending on Sunday. Toenter a daily schedule, navigate to Config, then Sched, thenenter BACview6 Admin Password (1111), then go toschedule_schedule. From here, enter either a Weekly or Excep-tion schedule for the unit.Occupancy Input Contact — The WSHP Open controller hasthe capability to use an external dry contact closure to deter-mine the occupancy status of the unit. The Occupancy Sched-ules will need to be disabled in order to utilize the occupancycontact input.NOTE: Scheduling can only be controlled from one source.BAS (Building Automation System) On/Off — A BASsystem that supports network scheduling can control the unitthrough a network communication and the BAS schedulingfunction once the Occupancy Schedules have been disabled.NOTE: Scheduling can either be controlled via the unit or theBAS, but not both.INDOOR FAN — The indoor fan will operate in any one ofthree modes depending on the user configuration selected.Fan mode can be selected as Auto, Continuous, or AlwaysOn. In Auto mode, the fan is in intermittent operation duringboth occupied and unoccupied periods. Continuous fan modeis intermittent during unoccupied periods and continuous dur-ing occupied periods. Always On mode operates the fan con-tinuously during both occupied and unoccupied periods. In thedefault mode, Continuous, the fan will be turned on wheneverany one of the following is true:• The unit is in occupied mode as determined by its occu-pancy status.• There is a demand for cooling or heating in the unoccu-pied mode.• There is a call for dehumidification (optional).When power is reapplied after a power outage, there will bea configured time delay of 5 to 600 seconds before starting thefan. There are also configured fan delays for Fan On and FanOff. The Fan On delay defines the delay time (0 to 30 seconds;default 10) before the fan begins to operate after heating orcooling is started while the Fan Off delay defines the delaytime (0 to 180 seconds; default 45) the fan will continue to op-erate after heating or cooling is stopped. The fan will continueto run as long as the compressors, heating stages, or the dehu-midification relays are on. If the SPT failure alarm or conden-sate overflow alarm is active; the fan will be shut down imme-diately regardless of occupancy state or demand.Fan Speed Control (During Heating) — Whenever heat is re-quired and active, the control continuously monitors the sup-ply-air temperature to verify it does not rise above the config-ured maximum heating SAT limit (110 F default). As the SATapproaches this value, the control will increase the fan speed asrequired to ensure the SAT will remain within the limit. Thisfeature provides the most quiet and efficient operation by oper-ating the fan at the lowest speed possible.Fan Speed Control (During Cooling) — Whenever mechani-cal cooling is required and active, the control continuouslymonitors the supply-air temperature to verify it does not fall be-low the configured minimum cooling SAT limit (50 F default).As the SAT approaches this value, the control will increase thefan speed as required to ensure the SAT will remain within thelimit. The fan will operate at lowest speed to maximize latentcapacity during cooling.COOLING — The WSHP Open controller will operate one ortwo stages of compression to maintain the desired cooling setpoint. The compressor outputs are controlled by the PI (propor-tional-integral) cooling loop and cooling stages capacity algo-rithm. They will be used to calculate the desired number ofstages needed to satisfy the space by comparing the space tem-perature (SPT) to the appropriate cooling set point. The waterside economizer, if applicable, will be used for first stage cool-ing in addition to the compressor(s). The following conditionsmust be true in order for the cooling algorithm to run:• Cooling is set to Enable.• Heating mode is not active and the compressor timeguard has expired.• Condensate overflow input is normal.• If occupied, the SPT is greater than the occupied coolingset point.• Space temperature reading is valid.• If unoccupied, the SPT is greater than the unoccupiedcooling set point.• If economizer cooling is available and active and theeconomizer alone is insufficient to provide enoughcooling.• OAT (if available) is greater than the cooling lockouttemperature.If all the above conditions are met, the compressors will beenergized as required, otherwise they will be deenergized. Ifcooling is active and should the SAT approach the minimumSAT limit, the fan will be indexed to the next higher speed.Should this be insufficient and if the SAT falls further (equal tothe minimum SAT limit), the fan will be indexed to the maxi-mum speed. If the SAT continues to fall 5° F below the mini-mum SAT limit, all cooling stages will be disabled.During Cooling mode, the reversing valve output will beheld in the cooling position (either B or O type as configured)even after the compressor is stopped. The valve will not switchposition until the Heating mode is required.The configuration screens contain the minimum SATparameter as well as cooling lockout based on outdoor-airtemperature (OAT) Both can be adjusted to meet variousspecifications.There is a 5-minute off time for the compressor as well as a5-minute time delay when staging up to allow the SAT toachieve a stable temperature before energizing a second stage