Completely packaged dryers with these outstanding features:
· Continuous removal of water vapor from compressed air and gas. Standard pressure dewpoints of -40°C (-40°F) Dewpoints as low as -75°C (-100°F) available optionally.
· Lowest installation costs. Units are fully assembled, completely packaged with prefilter and afterfilter.
· Lowest possible operating cost. Heating period control is standard with all models.
· Available with HY’s unique “AutoDew” demand cycle control with direct reading digital dewpoint meter.

General Information
GJ air dryers are heat reactivated, dual tower, desiccant type dryers designed to continuously adsorb water vapor from compressed air and gas. Continuous drying is accomplished by the operation of two desiccant towers. Drying takes place in one desiccant bed while the other (exhausted) bed is being reactivated. After a fixed time period of 4 hours or when the desiccant tower in service is exhausted (see “Autodew Demand Cycle Operation”) service is automatically switched from the exhausted tower to the reactivated one. Switching air (or gas) flow from one tower to the other is fully automatic. Switchover from one tower to the other takes place only when both are at equal pressure to eliminate lines surges and to minimize desiccant attrition. Reactivation of the saturated desiccant is accomplished by a small flow of electrically heated dry air (gas) which is passed upwards (counter-current to drying) through the desiccant bed to carry away liberated moisture. HY heat reactivated dryers are designed to prevent breakthrough of wet air (gas) under specified operating conditions and to prevent heat and dewpoint “bumps” at the beginning of the drying cycle.
Standard Features
· Pressure Dewpoints Standard -40°C (-40°F) Optional -100°C (-75°F)
· Counter-Current Reactivation
· Controlled Depressurization and Repressurization
· Heating Control Heating of the desiccant bed is terminated by a temperature controller on the basis of desiccant bed temperature. Only the required amount of heat to reactivate the desiccant is introduced into the dryer. This minimizes power and purge air consumption.
· Switching Failure Alarm and Dump Failure Alarm Alarm on a failure to switch towers and failure of a desiccant tower to depressurize for regeneration.
· Dewpoint Indicator A colour-change type dewpoint