Service manual

Avantra 36/44 Service Manual
2-34 Functional Analysis
2.15 Humidifier Option Overview
This section describes the mechanical, electrical and software characteristics for a
field installable humidifier sub-system.
2.15.1 General Description
The humidifier creates a 50% (±5%) relative humidity in the drum 15 minutes after
the humidifier is turned on. The system maintains an ambient range of 45% to 55%
humidity while remaining within the imagesetter’s operating temperature range.
The humidifie unit installs within the imagesetter; the replenishment water supply
mounts on the outside of the imagesetter for ease of access.
The following sub-assemblies make up the humidifier system:
• Humidifier sub-assembly
• Module sub-assembly
• Water supply)
• Electronics module (board)
• Float switch/water valve solenoid
• Fan control circuit
• Interface connections
• Switched +24 volt driver
• Fan speed selector
The following describes the function of each.
2.15.2 Humidifier Sub-assembly
The sub-assembly described below consists of the following:
• A 30 pore per inch air filter
• A water wick
• A 24 VDC 150 CFM fan
• A 90˚ PVC elbow
• A float switch
• A 24 VDC solenoid valve
• A humidifier enclosure
• Two quick disconnect couplings
The sub-assembly, a two part plastic module, mounts inside via a sheet metal inter-
face plate. The subassembly provides moist air to the imagesetter drum. Air inlet
and outlet ports on the module connect the flexible air hose to each end of the
drum.