Honeywell ENVIRAZONE PANEL W8835 Product Data

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Honeywell ENVIRAZONE PANEL W8835 Product Data Manual pdf 10 page image

W8835 ENVIRAZONE PANEL68-0258—04 10Heat Pump OperationThe panel can control one or two compressor stages plusauxiliary heat. Set DIP switch 1 and 2 to Off; set DIP switch 7to On for a single-stage compressor and to Off for a two-stagecompressor.Table 8. Heat Pump Equipment ConfigurationWire the reversing valve to the O/B equipment terminal. DIPswitch 9 configures this terminal to operate as an O (cool) orB (heat) changeover terminal.Hydronic Heat OperationThe W8835 is a forced air panel. However, it can be wired tocontrol hydronic valves as shown in figure 13. To controlvalves or circulators on a hydronic panel, see figure 14.Thermostat OperationDual Fuel EquipmentThe W8835 can operate Dual fuel equipment when used withan external fossil fuel kit. Locate the thermostat on the fossilfuel kit instructions and wire the W8835 equipment terminalsthere.Emergency Heat ControlEmergency heat is defined as using an auxiliary heat sourcewithout using the heat pump. The W8835 energizes the Eterminal on a call for emergency heat. The thermostat systemswitch is set to Em Heat to engage this function. When active,any zone calling for heat uses Emergency Heat, not thecompressor.The panel energizes W3 as auxiliary heat with the Y1 and Y2for compressor control in when not in emergency heat.Manual and Automatic Changeover OperationEach of the thermostats can be set for manual or automaticchangeover. If one or more thermostats call for cooling whileone or more thermostats call for heating, the panel attempts tosatisfy the greatest demand first.Then, based on the relative demand for heating and cooling,the panel intelligently switches between heating and cooling.The system attempts to satisfy both the heating and coolingdemands, and does not lock out one demand in favor of theother.DiscoveryDiscovery is an automatic system configuration program wherethe panel configures itself to operate with controls connected tothe EnviraCom bus. The panel enters Discovery when theDiscovery button on the panel is pressed.Rebooting MicroprocessorTo reset the microprocessor, press and release the Bootbutton. The system reboots and enters the Purge mode.EnviraCom FurnaceFor furnaces with EnviraCom communications built in,configure the panel as shown below. In this case, noconventional equipment wiring is necessary because theW8835 uses the 3-wire EnviraCom bus to control the HVACequipment. In these installations, the panel is powered fromthe HVAC equipment via the 1, 2, 3 wires. Because of this, thetransformer R and C terminals on the W8835 are not used.Instead, leave the XFMR jumpers in their default disconnectedposition and wire the transformer to T1 and T2.Table 9. Furnace Type ConfigurationHumidity, De-humidity andVentilation ControlThe panel can control humidity, de-humidity, and ventilation byreceiving messages from the VisionPRO® IAQ thermostat.The thermostat designated as zone 1 will have control of thesefunctions. Configure this thermostat as found in the installationinstructions for the thermostat.The humidity, de-humidity, and ventilation terminals are all dry-contact terminals; the relay contacts close when active. Sodevices that need dry contact control like a ventilator can bewired directly to the VENT terminals, or a steam humidifier canbe wired directly to the HUM terminals. Devices that need to bepowered like a ventilation damper or some models ofevaporative humidifiers are wired using the VENT or HUMterminals wired through the R terminal as shown in Fig. 3.If using a Honeywell TrueSteam humidifier, configure the zoneone VisionPRO IAQ thermostat installer setup #374 to "3", andwire the TrueSteam GF terminal to the HVAC fan terminal, andwire the TrueSteam GT terminal to the G on the W8835.NOTE: When controlling a steam humidifier, set all thermo-stats to HEAT. Do not set thermostats to AUTO. Thisprevents the panel from humidifying on zone 1, whenanother zone is calling for cooling. Alternatively, setzone 1 thermostat Installer Setup 374 to “2” to allowhumidification only during calls for heat.Equipment Type DIP 1 DIP 2Heat Pump Off (Down) Off (DownCompressor Stages DIP 71 Stage On (Up)2 Stage Off (DownHeat Pump Changeover DIP 9O (Cool) On (Up)B (Heat) Off (DownType of Equipment DIP 3Conventional On (Up)EnviraCom Off (Down)