York CZH Installation Manual

Also see for AC6B SERIES: Installation manual User's information manual User's information manual

835965-UIM-C-0814Johnson Controls Unitary Products 7DEHUMIDIFICATION CONTROLA dehumidification control accessory 2HU06700124 may be used withvariable speed air handlers or furnaces in high humidity areas. Thiscontrol works with the variable speed indoor unit to provide cooling at areduced air flow, lowering evaporator temperature and increasing latentcapacity. The humidistat in this control opens the humidistat contacts onhumidity rise. To install, refer to instructions packaged with the acces-sory and Figures 7-8. Prior to the installation of the dehumidificationcontrol, the jumper across the HUMIDISTAT terminals on the indoorvariable speed air handler or furnace CFM selection board must beremoved.During cooling, if the relative humidity in the space is higher than thedesired set point of the dehumidification control, the variable speedblower motor will operate at lower speed until the dehumidification con-trol is satisfied. A 40-60% relative humidity level is recommended toachieve optimum comfort.If a dehumidification control is installed, it is recommended that a mini-mum air flow of 325 cfm/ton be supplied at all times.INDOOR CFM CONFIGURATIONFor proper system operation the indoor CFM must be set properly.Refer to the Technical Guide for the outdoor unit for the recommendedair flow settings for each size condensing unit and matching indoor unit.Set the cooling speed per the instructions for the air handler or furnace.Verify the airflow.If installed as a communicating system (outdoor, indoor, and thermo-stat), the system will automatically adjust to the optimal airflow settings.These parameters can also be modified using the Touch Screen Com-municating Control. Refer to the Touch Screen Communicating Controlowner’s manual for this procedure. Manual setting of the airflow on theID equipment is not necessary with the Touch Screen CommunicatingControl.FIGURE 7: Communicating AC with Communicating Air Handler orFurnaceRCY1Y2Touch ScreenCommunicatingControlAir Handler/FurnaceCommunicatingControlAir ConditionerCommunicatingControlGNDor CGNDor CB-RA+GNDor CGNDor CB-RA+GNDor CGNDor CB-RA+A0205-001FIGURE 8: Communicating AC with Non-Communicating Air Handleror Furnace using Communicating Interface ControlRCY1Y2HUMW2DHUMWGCROYY2HUMW2DHUMWGCROYY2Touch ScreenCommunicatingControlCommunicatingIndoorInterface ControlNon-CommunicatingIndoor UnitAir ConditionerCommunicatingControlWire pernon-comm.installationmanualAssume thatconnectionsare fromthermostatGNDor CGNDor CB-RA+GNDor CGNDor CB-RA+GNDor CGNDor CB-RA+A0206-001