Honeywell T7351F2010 Installation Instructions - Page 9

T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Test Mode (Occupied/Not Occupied/ Schedule Day) CAUTION Possible Equipment Damage. Equipment damage can result if compressor is cycled too quickly. The minimum off time for compressors is bypassed during Test Mode. Equipment damage can occur if the compressor is cycled too quickly. Use the Test Mode to check the thermostat configurations and operation. To start the system test: 1. Press Schedule Day, Occupied and Not Occupied simultaneously. 2. The display gives the option to TEST. a. To enter test mode, press up or down until the display indicates IN TEST. b. To cancel this option, ensure display indicates NO TEST. 3. Press Run Schedule. NOTES: - - To verify whether or not the system test is still active, repeat the above process. The system test times out after ten minutes with no key pressed. Save User Schedule (Info/Copy) Performing this operation saves the current schedule (including holidays) to memory, overwriting the old saved schedule: 1. Press both Info and Copy. 2. The display gives the option to revert to SAV SHD. a. To save the current schedule, press up or down until the display indicates YES. b. To cancel this option, ensure display indicates NO. 3. Press Run Schedule. Get User Schedule (Info/Run) Getting the user schedule restores the schedule (including holidays) from saved memory, overwriting the schedule currently in use: 1. Press both Run Schedule and Info. 2. The display gives the option to GET SHD. a. To retrieve the saved schedule, press up or down until the display indicates YES. b. To cancel this option, ensure display indicates NO. 3. Press Run Schedule DEHUMIDIFICATION There are five methods through which the T7351 can control for dehumidification. Three of them modify the control algorithm, thus providing limited dehumidification through cooling. The other two use the auxiliary output to control another device. NOTE: The dehumidification high limit can be set within the range of 10 to 90 percent relative humidity. Control Through Cooling Configure using some combination of the following: - Minimum On. - Reheat. - Reset. NOTES: - - These methods operate only during cooling. Selecting both Reheat and Reset options can cause frequent setpoint adjustments. This selection is not recommended. Min. ON Time Dehumidifies by increasing the compressor minimum on time (normally 3 minutes) by a programmable amount. This is useful with oversized systems in that it forces the coils to cool to a point where dehumidification can occur. NOTES: - - - Can force wider temperature swings by cooling when setpoint control does not require it. The minimum on time can be set within the range of 5 to 15 minutes. Hysteresis and a minimum timer are used to ensure this behavior does not change with every equipment cycle. Reheat Dehumidifies by operating cooling during typical off time. The T7351 maintains the proper setpoint by running the heat at the same time. IMPORTANT At times during Reheat dehumidification, the T7351 operates heating and the cooling simultaneously. This is normal. NOTES: - - The heat stage never energizes during Reheat if more than one cool stage is on. Reheat mode cannot occur during heating. Reset Temp SetPt The room temperature set point resets to a specified number of degrees below the actual set point when room relative humidity (RH) rises above humidity high limit set point. Though this may not technically reduce relative humidity in the room, it reduces the dew point to provide the customer with a sense of comfort due to a lower temperature setting in the room. As long as RH stays above humidity high limit set point, this set point is maintained. NOTE: Hysteresis and a minimum timer prevent the set point from short interval alternation (between standard and reset set points). Options Utilizing Auxiliary Output There are two dehumidification options that utilize the auxiliary output. They are: - Simple Dehumidification. - Hot Gas Bypass Dehumidification. Simple Dehumid(ification) The auxiliary output: - Energizes when RH rises above humidity high limit. - De-energizes when RH drops below humidity high limit. NOTES: - - Hysteresis and a minimum timer prevent short cycling of this output. Unlike Dehumid Hot Gas BP the relay remains energized during calls for multiple cooling stages. 9 62-0258-05