User manual HONEYWELL W7751F

[. . . ] ([FHO :%')+ 9$9, , &RQWUROOHUV Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Description of Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Control Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Control Provided . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] DD_DAFlowSensor (The node is connected to control both the cold and hot air supply damper. The physical damper outputs control the cold supply damper and the reheat physical floating outputs controls the hot air damper. The node has an air flow sensor measuring the total discharge air flow. The temperature control loop is enabled, and either warm air or cold air is supplied to the space. When cooling is called, only Cool air is supplied to the space (damper on hot duct is fully closed). DD_DAFlowSenConst (The node is connected to control both the cold and hot air supply damper. The physical damper outputs control the cold supply damper and the reheat physical floating outputs controls the hot air damper. The node has an air flow sensor measuring the total discharge air flow. Both warm air and cold air can be supplied to the space at the same time in the transition from heating to cooling or from cooling to heating. Measured flow controls the cold duct damper Position and space temperature controls the hot duct damper Position). DD_CDFlowSensor (The node is connected to control both the cold and hot air supply damper. The physical damper outputs control the cold supply damper and the reheat physical floating outputs controls the hot air damper. Both warm air and cold air can be supplied to the space at the same time in the transition from heating to cooling or from cooling to heating. Measured flow controls the cold duct damper Position and space temperature controls the hot duct damper Position). Miscellaneous These additional configuration parameters can be specified: 1. Wall Module Options: (a) A T7770 Wall Module needs to be connected to the controller. Examples are Temperature Sensor Only or Temperature Sensor plus Bypass Switch, etc. Excel 10 VAV Controller can share wall module information with other controllers. Both the temperature sensor and the setpoint potentiometer can be shared. The user-adjustable setpoint potentiometer can work in either of two ways, relative (this uses a positive or negative offset of the programmed setpoint) or absolute, which means that if the dial says 74°F, the controller uses 74°F for the setpoint if it is within the setpoint limits specified by the Standby Setpoints. Air Temperature Sensor types: (a) Absolute_Setpoint (When SetPtKnob is set to Absolute Middle, the setpoint knob becomes the center of the Zero Energy Band (ZEB) between the cooling and heating occupied setpoints. ). (b) Relative_Setpoint (uses a positive or negative offset of the programmed setpoint). [. . . ] In this case, another pressure value was selected so the resulting velocity value would be less than 3500 FPM (1778 L/sec). (For this case, the flow velocity at 1. 5 Inw (0. 375 kPa) is 3429 FPM (1742 L/sec. ) This formula can be rewritten, for convenience, to solve for Velocity: Flow Velocity FPM (L/sec) Metal Industries Series 400 flow pickup has the following pressure/velocity relationship: Pv = (V/2800)2 Where: (Pv is differential pressure in Inw). (V is flow velocity in FPM). Restrictions and requirements for these tables: 1. Maximum differential pressure entry must not be greater than 2. 00 Inw (0. 5 kPa). [. . . ]