Honeywell ENVIRAZONE PANEL W8835 Product Data

Contents

Honeywell ENVIRAZONE PANEL W8835 Product Data Manual pdf 11 page image

W8835 ENVIRAZONE PANEL11 68-0258—04Discharge Air Temperature SensorDATSThe C7835A1009 Discharge Air Temperature Sensor (includedin the Y8835 kits) is a supply-duct-mounted temperaturesensor probe used to control capacity and prevent high plenumtemperatures or coil-icing. The sensor is wired to theEnviraCom bus using three wires. When a high or low limit isreached, the panel shuts off the equipment and keeps the fanoperating for a minimum of two and one-half minutes. After thistime, and any applicable minimum-off times imposed by theHVAC equipment. It re-energizes the equipment when thedischarge air has recovered by ten degrees. When the high orlow limit is exceeded, the Heat (red) or Cool (green) LED onthe DATS flashes.When the DATS is in a limit condition, the Heat, Cool andPurge LEDs on the W8835 panel continue to operate as if theDATS were not turning the equipment off.The high and low limit is set on the DATS. The hightemperature limit is set from 110°F to 160°F with a smallscrewdriver or using fingers and the low limit is set at 40°F or48°F degrees with a jumper.Circuit Breaker ProtectionA built-in thermal circuit breaker protects the EnviraZone panelagainst shorts in the damper wiring and EnviraCom bus. Itdoes not protect against shorts in the HVAC equipment wiringinto the panel.When the circuit breaker is tripped, none of the LEDs illuminateand the yellow rectangular component located bottom centeron the panel is hot to touch.• Remove power to the panel for at least five minutes to allowthe circuit breaker to cool off and reset.• To eliminate the short, verify the dampers and transformerwiring.Fan On In HeatThe system blower can be set to come on with a call for heatas required for hydro-air or electric heat systems. Set theblower function using DIP switch 8. When configured for heatpump, this DIP switch is not used.Table 10. Fan-in-heat ConfigurationAdding Additional ZonesConnect one W8703 to the EnviraCom bus to expand thesystem up to six zones or connect two W8703 to control up tonine zones:• Wire the first three zone dampers and thermostats to theW8835 Envirazone Panel.• Wire the additional dampers to the W8703 panels.• Set the DIP switches on the W8703 to correspond to thezones being controlled. See W8703 Installation Instructions.• Wire terminals 1, 2, and 3 from the additional thermostats toterminals 1, 2, and 3 on any of the panels.TROUBLESHOOTINGTable 11. TroubleshootingDIP Switch 8 Fan ControlOff (Down) Fan on in heat by panel.On (Up) HVAC control of fan.Symptom Possible Cause ActionNo LEDs are Illuminated. No power to the board. Check for 24 Vac (±10%) across R and C.Transformers out of phase. If 48 Vac across R and T1, reverse T1 and T2 wires.Shorted wire. Check thermal circuit breaker. If hot, a short exists in wiring.Damper LEDs on, but noother LEDs illuminate on acall for heat, cool, or fan.Insufficient voltage. Check for 24 Vac (±10%) across R and C.Incorrect configuration. Check jumpers and DIP switches for correct configuration.Heat pump operatesincorrectly or not at all.Incorrect wiring. Verify equipment terminals wiring.Incorrect configuration. Verify DIP switches configuration.No damper LEDs areilluminated.Incorrect configuration. Verify that XFRM jumpers are set correctly.Error 35 or 39 message onthermostats.Incorrect zone numbers. Verify the thermostat zone numbers are set correctly (1,2,3 etc)Wait is continuously in thethermostat displayIncorrect configuration Verify dip switch 3 is set to conventional (Up) position. Ifcontrolling a heat pump, verify that thermostats are not configuredto lockout the compressor based on outdoor temperature.(This feature is not used on zoned applications)