User manual HONEYWELL R7426B

[. . . ] HONEYWELL MicroniK 200 TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK INSTALLATION & START-UP INSTRUCTIONS R7426A, B, C GENERAL This document provides instructions and procedures for installing and starting up the Micronik 200 R7426A, B, C controllers. The user interface and liquid-crystal display allow accurate and easy parameter setting and output adjustment. BEFORE INSTALLATION NOTE · · · Visually inspect equipment for shipping damage. Refer to job drawings for specific installation information and mounting location. Verify the controllers will be adequately separated from the main power supply, relays, or other equipment which can possibly generate electromagnetic interference. [. . . ] This is the maximum air temperature increase produced by the heating coil or decrease of a cooling coil if the control valve is fully open. The proportional band Xp for discharge air control can be calculated by using the following rule-of thumb formula: Xp = Xh 5 For room temperature control, the following rule-of-thumb formula can be used: Xp = Xh tmaxdischarge air or 10 10 T1 T1 T1 T1 x x x x x x x x The tmax (Xh) of the discharge air for mixed air damper control is the maximum difference between outdoor air (OA) temperature and return air (RA) temperature. Xh = RA - OAmin The often-specified accuracy for room control of ±1 (Xp = 2K) allows a discharge air alteration of 20 °C. In P+I control the same proportional band can be used as for P control. The following rule-of-thumb formulae are used for P+I control: · x x x x · Discharge air control Room control Xp = Xp = Xh 4. . . 5 T1 T2 T2 T2 T2 x x x x x x Xh tmaxdischarge air or 8. . . 10 8 . . . 10 Reset Time tr1 / tr2 (P. 12 / P13) Xw 0 t Y P 100 P = X Xw % p t tr Fig. Step change response of P+I control P %/s tr Throttling Range Xpc / Xph (P. 10 / P11) The control parameters Xpc and Xph are only available on R7426B, C controllers and are used to set the cooling and heating throttling ranges for the following applications · Temperature sequence control with heating, mixed air dampers, and cooling (see Fig. 3 and Table 11) · Temperature cascade control with heating, mixed air dampers, and cooling (see Table 11) In applications without cooling, the throttling range Xpc must be set to OFF 100% fresh air supply at actual temperature above the control point is required (outdoor and return air dampers fully open). Y[%] 100 Y3 1/4 Xp1 if Xpc = Off Damper Y1 MINPOS Heating Cooling if Xpc = Off Y2 0 CTRPH CTRP1 Xph Xp1 CTRPC Xwh / Xwc / Xwd Xpc T2 Fig. Temperature sequence control with heating, mixed air dampers, and cooling valve In the case of combined action including proportional and integral components (P+I control), the reset time (tr) is defined as the required time after which the integral part is equal to the change due to the proportional action for a predetermined step change in the input variable. The control parameter tr1 sets the reset time of the P+I main temperature control loop. For limit or submaster cascade control the control parameter tr2 sets the reset time of these control loops, e. g. If only proportional control is required, parameter tr must be set to OFF. 9 EN1B-0203GE51 R0507C R7426A, B, C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL TIME CLOCK Setting Guidelines for Reset Time of P+I Control The reset time tr should be adjusted to 2. . . 3 times of the response time Tu , which is the time interval between the beginning of a sustained disturbance (e. g. rapid step change of valve position) and the instant when the resulting change in the output signal reaches a specified fraction of its final steady-state value, either before overshoot or in the absence of overshoot. The response time Tu in discharge air control is normally in the range of 0. 1 to 0. 6 min, which allows adjustments of the reset time tr in a range of 0. 2 to 2 min. In room control the response time Tu is in the range of 0. 5 to 5 min, which results in a setting of 1 to 15 min. Table 12. (T3/Tcomp) 20°C -15°C throttling range (XP) 2°C 2°C T1 + Xp 100% = t Outside Air (22 - 20) + 2 100% = 12% 35 20°C 35°C 2°C 2°C 20°C 26°C Aut Su = Summer Start Point Ystart (P. 15) This control parameter is available only on the single output controller R7426A and on the R7426B controller if the three 3position floating outputs are configured for 6-stage ON/OFF sequence control and on the R7426B, C controllers if YMode = 1 is selected. The start point determines the midrange shift of the output Y1 from the calculated control point. The start point is calibrated in degrees K and is the offset (plus or minus) from the set values or calculated control points at which the output Y1 is at 50%. Normally and especially in P+l control, the start point should be set at zero. A change is required only in specific applications where a asymmetrical arrangement results in improved control performance, e. g. if for heat-up of a large space in the morning a high heat capacity is needed and for normal control the valve must be opened by only a small amount. T1 - Xp 100% = t Outside Air (26 - 20) - 2 100% = 27% 15 Compensation change-over at +20 °C outdoor air temperature NOTE: With P+I control Xp = 0 Occupied/Unoccupied Function SOFFS (P. 16) A potential-free contact can be used between terminals 1 and 4 to switch the controller between occupied (contact closed) or unoccupied (contact open) mode. In occupied mode, the temperature set point W1 is used for the control point calculation. [. . . ] In this case the controller behaves like a controller without real-time clock. If the occupancy input is inactive, the controller will be assumed as occupied. OR TIME ADJUSTMENT TO ADJUST HOURS OR TO SELECT WEEKDAY, WEEK GROUPS, OR HOLIDAY TYPES OR TO ADJUST SCHEDULE POINT Tu OR TO ADJUST SWITCHING TIME Tu OR TO ADJUST CONTROLLER MODE Tu OR TO ADJUST MINUTES Fig. Standard schedule programming Date OR TO ADJUST YEAR DATE ADJUSTMENT Date OR TO ADJUST MONTH Date OR TO ADJUST DAY Fig. Date and time adjustment mode 17 EN1B-0203GE51 R0507C R7426A, B, C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK Programming Holiday Schedule (with RTC, only) The holiday schedule programming is used to program each day of the year (01. 01 . . . [. . . ]