AAF UV05 Operation & Maintenance Manual

Description of Operation PI Control Parameters Associated with each PI loop is a set of two adjustable parameters: Proportional Band and Integral Time. When the unit ventilator is properly sized for the space, the factory settings for these parameters provides the best and most robust control action (see Figure 20). If field problems arise, first ensure these parameters are set back to the factory default settings. If adjustment is required, only make small adjustments to one parameter at a time. After each adjustment, allow enough time for the system to stabilize before makin ...

Description of Operation In each of these special purpose UVC modes, if the space temperature drops below EHS and the Emergency Heat function is enabled, the UVC is forced into the Emergency Heat mode (see “Emergency Heat Mode (Super State)” on page 16) and then return once the Emergency Heat function is satisfied. Table 9: Actions during special purpose unit modes Pressurize Mode When in Pressurize mode, the UVC uses the IAF, OAD, and exhaust output as needed to pressurize the space. The UVC stops all normal heating and cooling but does allow emergency heat if required. T ...

Description of Operation Emergency Heat Mode (Super State) The Emergency Heat mode is provided for situations where the UVC is in a mode that does not normally allow heating, such as OFF, Cool, Night Purge, or Fan Only. If Emergency Heat mode is enabled, the UVC can automatically force itself into the Emergency Heat mode from OFF, Cool, Night Purge, Fan Only, Purge, Pressurize, De-pressurize, and Shutdown. Emergency Heat mode consists of UVC states: Full Heat [7] and Cant Heat [D]. Software model 05 does not have the primary or secondary heating devices. The UVC uses auxiliary ...

17 Description of Operation Auto Mode Auto mode is provided so that the UVC can be set to automatically determine if heating or cooling is required. Auto mode is the default power-up UVC mode. Auto mode is made up of the Heat and Cool modes. When the UVC is set to auto mode, the UVC automatically determines which mode (Heat or Cool) to use. Heat Mode (Super State) When in Heat mode, the UVC will use auxiliary heat (if field provided and field connected to the unit) as needed to maintain the effective heating setpoint (see “Space Temperature Set Points” on page 26). The keypad ...