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Home My WebLink AboutB16-0266_M701_1491490975.pdfGENERAL WHEN THE UNIT IS NOT SUPPLYING AIR, THE UNIT ISOLATION DAMPERS SHALL BE CLOSED. THE SEQUENCE DESCRIBED BELOW CONSISTS OF THREE MODES: SHUTDOWN, OCCUPIED COOLING OR HEATING, AND ECONOMIZER. SHUTDOWN MODE IS INTENDED TO DESCRIBE STOPPING RTU FANS IN AN ORDERLY MANNER, CLOSING DAMPERS AND INDICATE SHUTDOWN INFORMATION AT THE CONTROLLER. OCCUPIED COOLING OR HEATING MODE IS DETERMINED BASED ON THE OCCUPANCY SCHEDULE AND ADJUSTED BY THE OPTIMAL START PROGRAM FROM THE CONTROLLER. INITIAL OCCUPANCY SCHEDULE SHALL BE RUNNING 24 HOURS PER DAY. SHUTDOWN MODE: WHEN THE RTU IS INDEXED FOR SHUTDOWN MODE, THE UNITS SUPPLY AND EXHAUST FANS SHALL STOP. THE RTU EXHAUST AIR DAMPER SHALL OPEN FULLY, RELIEF AIR, OUTSIDE AIR AND ISOLATION DAMPERS SHALL CLOSE. COOLING AND HEATING SHALL BE DISABLED DURING SHUTDOWN. THE SYSTEM SHALL BE INDEXED TO SHUTDOWN MODE IF ANY ONE OR MORE OF THE FOLLOWING CONDITIONS ARE MET: ● A SHUTDOWN SIGNAL FROM THE CONTROLLER CONSOLE. ● AN ALARM CONDITION FROM THE RTU SUPPLY AND EXHAUST DUCT SMOKE DETECTOR. ● UPON ALARM CONDITION FROM THE RTU FREEZESTAT. OCCUPIED MODE: HEATING OR COOLING: ● AT THE PREDETERMINED OPTIMUM START TIME, AS DETERMINED BY THE OCCUPANCY SCHEDULE, THE RTU WILL BE ENABLED. ● THE BAS SHALL NEXT COMMAND THE RTU TO RUN AND OPEN THE ISOLATION DAMPERS. ● SPACE TEMPERATURE AND HUMIDITY SETPOINTS SHALL BE LOCATED IN TWO FLOORS IN THE CORRIDORS. TEMPERATURE AND HUMIDITY SHALL BE "WORST CASE" SELECTED AS THE CRITICAL CONTROL POINT. ● WITH BOTH FANS RUNNING, THE OVERALL AIRFLOWS AT CONSTANT VOLUME SHALL PROVIDE POSITIVE PRESSURE TO THE BUILDING. A BUILDING PRESSURE SENSOR SHALL BE PROVIDED AS AN AUXILIARY INPUT TO EACH UNIT. THE SENSOR SHALL MEASURE FROM AN UPPER LEVEL CORRIDOR TO OUTSIDE AMBIENT TO ENSURE A POSITIVE READING. EACH UNIT'S CONTROLLER SHALL THEN INDICATE WITH A DIGITAL INDICATION, WHETHER OR NOT THE ASSOCIATED SENSOR IS POSITIVE OR NEGATIVE. ● (MECHANICAL COOLING) ON A RISE IN SPACE AIR TEMPERATURE ABOVE SETPOINT AND THE HEATING COIL IS DISABLED, COOLING SHALL BE STAGED TO MAINTAIN TEMPERATURE SETPOINT (ADJ, INITIAL SETPOINT 74 F RESET THE SPACE TEMPERATURE SET POINT TO 70 F WHENEVER OAT < 35 F, BOTH ADJ.). ● ON A FALL BELOW SPACE AIR TEMPERATURE SETPOINT, AND COOLING IS DISABLED, THE ELECTRIC HEATING COIL SHALL MODULATE (SCR CONTROL) TO MAINTAIN SPACE TEMPERATURE SETPOINT. ● HIGH HUMIDITY DISCHARGE CONTROL SHALL BE ACCOMPLISHED VIA THE SPACE HUMIDITY SENSOR TO MAINTAIN A MAXIMUM HUMIDITY OF 55 PERCENT (ADJ.) AND ACCOMPLISHED BY COOLING AND HOT GAS REHEAT. SMOKE SHUTDOWN: IN THE EVENT THAT SMOKE IS PRESENT IN THE RTU EXHAUST OR SUPPLY AIR DUCT: ● AN AUXILIARY CONTACT IN THE EXHAUST OR SUPPLY AIR DUCT SMOKE DETECTOR SHALL OPEN DE-ENERGIZING THE AUTO-MAINTAINED POWER SUPPLY TO THE FAN'S STARTER OR AFD OF THE RTU CAUSING THE FANS TO SHUT OFF. ● THE BAS SHALL SHUT DOWN THE EXHAUST AIR FANS UPON SHUTDOWN OF THE SUPPLY AIR FANS IN THE UNIT. ● SMOKE DETECTOR CONTACTS SHALL BE WIRED IN SERIES IN THE FAN MOTOR STARTER CIRCUIT. ● THE MECHANICAL CONTRACTOR SHALL PROVIDE AND TERMINATE THE HARD-WIRED CONNECTIONS FROM ANY DETECTOR RELAY (PROVIDED BY FIRE ALARM CONTRACTOR AND INSTALLED BY MECHANICAL CONTRACTOR) TO THE ASSOCIATED FAN TO BE SHUT DOWN, UNLESS OTHERWISE COORDINATED WITH THE UNIT MANUFACTURER. ● DURING MORNING COOL DOWN THE CHW VALVE SHALL MODULATE OPEN OR CLOSED TO MAINTAIN DISCHARGE AIR TEMPERATURE AT DISCHARGE TEMPERATURE SETPOINT (ADJUSTABLE, STARTUP SETPOINT 58 F). THE AHU CONTROLLER SHALL RESET THE SUPPLY AIR TEMPERATURE SETPOINT 1 F COLDER EVERY 10 MINUTES (ADJUSTABLE) UNTIL THE SUPPLY TEMPERATURE IS AT THE OPERATING SETPOINT TEMPERATURE (ADJUSTABLE, INITIAL SETPOINT 55 F). IF THE RETURN AIR RELATIVE HUMIDITY RISES ABOVE 50%, THE 10 MINUTE CYCLE SHALL REPEAT AT THE SAME TEMPERATURE. ● DURING MORNING WARM-UP THE BAS SHALL MODULATE THE PREHEAT COIL VALVE TO ACHIEVE DISCHARGE SETPOINT. AFTER THAT DISCHARGE SETPOINT IS ACHIEVED AND RETURN AIR FROM THE TERMINAL ZONES REACHES THE PREDETERMINED ROOM SETPOINT (68° F, ADJ), THE BAS SHALL COMMAND THE TWO-POSITION, MINIMUM OA DAMPER OPEN. GENERAL NOTE: 1.) TERMINAL UNIT LOOP BRANCH PUMP/LOOP SHALL BE ENABLED WHEN BOILER LOOP IS ENABLED AND RUNNING. HOT WATER PUMP: 1.) THE HOT WATER LOOP CONSISTS OF A CONSTANT VOLUME DEDICATED PUMP THAT SHALL INCORPORATE THREE-WAY MIXING VALVES AT THE TERMINAL UNIT HOT WATER COILS TO MAINTAIN FLOW AND DISCHARGE TEMPERATURE. 2.) WHEN ENABLED, THE PUMP SHALL RUN CONTINUOUSLY. 3.) THE THREE-WAY MIXING VALVES SHALL BE CONTROLLED TO MAINTAIN SPACE TEMPERATURE PER ZONE THROUGH THE TERMINAL UNIT CONTROLLER. VALVES SHALL BE SIZED TO ALLOW CONSTANT FLOW AT THE PUMP. ECONOMIZER MODE: ● SYSTEM SHALL MONITOR ENTHALPY DIFFERENTIAL BETWEEN RETURN AIR AND OUTDOOR AIR. WHEN OUTDOOR ENTHALPY IS LESS THAN RETURN AIR ENTHALPY, ECONOMIZER MODE SHALL BE ENABLED. ● WHEN ECONOMIZER MODE IS ENABLED, OPEN OUTDOOR AIR DAMPER TO 100% SETTING AND CLOSE THE RETURN AIR TO THE 0% SETTING. COOLING AND HEATING SHALL BE DISABLED WHEN ECONOMIZER MODE IS ENABLED. 1 A 2 3 4 5 6 A B C D E 1 3 4 5 6 2 COPYRIGHT 2016 BASKERVILL. USE OF THIS WORK IN WHOLE OR IN PART IS FORBIDDEN WITHOUT EXPRESSED WRITTEN CONSENT. B C D E DRAWING NO. P.O. BOX 400, RICHMOND, VA 23218-0400 DRAWING TITLE ISSUE PROJECT OWNER ® 8/29/2016 4:46:14 PM UNIT CONTROLS THE WIDEWATERS GROUP 2.160036.0 DOUBLETREE VAIL, CO CONVERSION GUESTROOMS & PUBLIC SPACES RENOVATION 08/25/16 - CONSTRUCTION DOCUMENTS M701 2211 N FRONTAGE RD, VAIL, COLORADO 81657 SEQUENCE OF OPERATIONS AHU VARIABLE AIR VOLUME AIR HANDLER UNIT SEQUENCE OF OPERATIONS TERMINAL UNIT HYDRONIC CONTROLS 1 8/25/2016 Revision 1 08/29/2016 04/06/17