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<br /> ^ TDMZ-VAV-1 & CU-1 SPLIT SYSTEM VAV TRIPLE DECK MULTI-ZONE UNIT WITH AIR COOLED DX CONDENSING UNIT _ � Q� o
<br /> i � �'t 5� co
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<br /> � EQUIPMENT DESCRIPTION � �W° � X o �
<br /> o THE UNIT IS A SPLIT SYSTEM, SEASONS-4 MULTI-ZONE UNIT WITH AN DAIKIN AIR COOLED CONDENSWG SECTION ALONG '� a��W� �,� " O
<br /> � WITH A VARIABLE AIR VOLUME SUPPLY AND REfURN BLOWER. -� °' 0
<br /> .� � ; � � U
<br /> m THE UNIT INCLUDES:
<br /> k;� �o � Q
<br /> W a) DX COOLING SYSTEM WITH HOT GAS BYPASS
<br /> O �,.. =vE �
<br /> �� 3
<br /> N b) PLENUM SUPPLY AIR BLOWER �� Q� � Z
<br /> � .,.�,.1
<br /> U �;� �N �
<br /> o c RETURN AIR BLOWER
<br /> (Q �° � a� Q
<br /> ! d) POWER VENTED TUBULAR DUCT FURNACE � T Q �
<br /> � e) DRY BULB CHANGEOVER ECONOMIZER
<br /> N f) DDC CONTROLS � �a
<br /> m
<br /> o OCCUPIED MODE
<br /> N
<br /> = THE UNIT CAN BE PLACED IN THE OCCUPIED MODE BY A 7-DAY PROGR,4MMABLE SCHEDULE IN THE DDC CONTROLLER,
<br /> � ACCESSIBLE THROUGH THE KEYPAD. A DIGITAL INPUT SHALL BE AVAILABLE TO OVERRIDE ANY OTHER COMMAND, AND
<br /> m TURN THE UNIT ON EVEN WHEN THE SCHEDULE IS CALLING FOR THE UNIT TO BE OFF (UNOCCUPIED MODE). THE DIGITAL
<br /> ,� SCHEDULE. BECOME THE PRIMARY MEANS OF ENABLING THE UNIT BY NOT HAVING ANY ON/OFF TIMES IN THE ���ON 8����
<br /> L UNOCCUPIED MODE ,�• ��
<br /> ° THE SUPPLY AIR BLOWER SHALL BE DE-ENERGIZED. THE OUTDOOR AIR DAMPER WILL BE FULLY CLOSED AND THE REfURN ^� t o �
<br /> ~ � �N x
<br /> � AIR DAMPER WILL BE FULLY OPEN. NO COOLING OR HEATING FUNCTION WILL BE ALLOWED. � �� �
<br /> & SUPPLY AIR BLOWER
<br /> 0
<br /> THE SUPPLY AIR BLOWER WILL RUN CONTINUOUSLY IN OCCUPIED MODE. THE SUPPLY AIR BLOWER WILL BE A VARIABLE AIR 1' 04
<br /> � VOLUME TYPE CONTROLLED BY VARIABLE SPEED DRIVE. THE INPUT TO THE VSD SHALL BE VIA A PRESSURE TRANSDUCER
<br /> ^ LOCATED IN THE SUPPLY AIR BLOWER PLENUM. THIS TRANSDUCER WILL SEND A CONTROL SIGNAL TO THE CONTROLLER THAT
<br /> - � WILL IN TURN SEND A SIGNAL TO THE DRIVE. THE DRIVE WILL RAMP THE SPEED OF THE SUPPLY AIR BLOWER TO MAINTAIN
<br /> ' A CONSTANT SUPPLY AIR BLOWER PLENUM PRESSURE (APPROX. SET POINT = 1.5" W.C., ADJUSTABLE). THERE SHALL BE
<br /> A MANUAL RESET HIGH PRESSURE SAFEfY SWITCH LOCATED IN THE SUPPLY AIR BLOWER PLENUM TO DE-ENERGIZE THE
<br /> SUPPLY AIR BLOWER IN THE EVENT THAT THE SUPPLY AIR BLOWER PLENUM PRESSURE BECOMES EXCESSIVE (SEi POINT I I I I I I I I
<br />' = 2.0° W.C., ADJUSTABLE). �
<br /> a
<br /> RETURN AIR BLOWER �
<br /> THE RETURN AIR BLOWER WILL RUN CONTINUOUSLY IN OCCUPIED MODE. THE RETURN AIR BLOWER WILL BE A VARIABLE AIR
<br /> VOLUME TYPE CONTROLLED BY VARIABLE SPEED DRIVE. THE DRIVE WILL RAMP THE SPEED OF THE REfURN AIR BLOWER TO
<br /> TRACK THE SUPPLY BLOWER SPEED.
<br /> COMPRESSOR & COOLING SECTION
<br /> THE UNIT COOLING WILL BE ENABLED FROM A SPACE TEMPERATURE SENSOR. THE UNIT COOLING WILL BE CONTROLLED
<br /> FROM A UNIT DISCHARGE AIR TEMPERATURE SENSOR TO MAINTAIN A SEf POINT OF 57 DEG F (ADJUSTABLE). A CALL FOR
<br /> COOLING WILL BE INITIATED WHEN ANY ONE ZONE IS FULLY OPEN TO THE COLD DECK AND THE TEMPERATURE RISES
<br /> ABOVE THE COOLING SET POINT OF THE ZONE'S TEMPERATURE CONTROL. THE CALL FOR COOLING WILL CONTINUE UNTIL ALL
<br /> ZONES ARE SATISFIED. THE UNIT IS EQUIPPED WITH AN EVAPORATOR COOLING COIL. ON A CALL FOR COOLING, A SIGNAL �
<br /> WILL BE SENT TO THE CONDENSING UNIT TO ACTIVATE COMPRESSORS.
<br /> z
<br /> 0
<br /> HOT GAS BYPASS STUBS ARE PROVIDED ON BOTH CIRCUITS OF THE DX COIL. MECHANICAL COOLING IS DISABLED IF THE �
<br /> COIL LEAVING TEMPERATURE DROPS BELOW 38'FDB (ADJUSTABLE). COOLING WILL REACTIVATE ONCE THE FREEZE STAT I I I I I I I I �
<br />, DOWNSTREAM OF EVAPORATOR COIL IS SATISFIED. THE UNIT WILL HAVE A LOW AMBIENT LOCKOUT SET AT 50'F
<br /> (ADJUSTABLE).
<br /> I I I I I I I �I W
<br /> M a
<br /> HEATING SECTION N Q
<br /> THE UNIT HEAT WILL BE ENABLED FROM A SPACE TEMPERATURE SENSOR. THE UNIT HEAT WILL BE CONTROLLED FROM A �
<br /> �
<br /> T DISCHARGE AIR TEMPERATURE SENSOR TO MAINTAIN A SET POINT OF 100'F (ADJUSTABLE). A CALL FOR HEATiNG WILL o
<br /> BE INITIATED WHEN ANY ONE ZONE IS FULLY OPEN TO THE HOT DECK AND THE TEMPERATURE FALLS BELOW THE HEATING
<br /> SEf POINT OF THE ZONE'S TEMPERATURE CONTROL. THE CALL FOR HEATING WILL CONTINUE UNTIL ALL ZONES ARE SATISFIED.
<br /> THE UNIT WILL HAVE TWO POWER VENTED TUBULAR DUCT FURNACES. ONE FURNACE IS PROVIDED WITH A 2-STAGE GAS �
<br /> STAGING PURPOSE AND THE SECOND FURNACE HAS A MODULATED CONTROL WITH A 5:1 TURNDOWN R,4TI0. A
<br /> �
<br /> TIME-DELAY RELAY IS HARD WIRED TO ALLOW THE FAN TO RUN FOR A PERIOD OF 5 MINUTES UPON UNIT SHUT-DOWN �
<br /> AFI'ER HEATING MODE OF OPERATION IN ORDER TO DISSIPATE THE RESIDUAL HEAT. THE UNIT WILL HAVE A HIGH AMBIENT �-
<br /> TEMPERATURE LOCKOUT SET AT 70'F (ADJUSTABLE). Z
<br /> 0
<br /> c.�
<br /> ECONOMIZER (OUTSIDE, REfURN & EXHAUST DAMPERS) �
<br /> THE ECONOMIZER WILL HAVE A DRY BULB CHANGEOVER CONTROL WHICH WILL ENABLE THE ECONOMIZER ANYTIME THERE � �
<br /> � z
<br /> IS A CALL FOR COOLING AND THE AMBIENT DRY BULB TEMPERATURE IS BELOW THE CHANGEOVER SET POINT OF 53'F. THE w o
<br /> OUTDOOR, EXHAUST AND REfURN AIR DAMPERS WILL MODULATE TO MAINTAIN A MIXED AIR TEMPERATURE OF 55'F
<br /> o. �
<br /> (ADJUSTABLE). WHEN THE ECONOMIZER IS DISABLED AND THE UNIT IS IN OCCUPIED MODE, THE OUTDOOR AIR DAMPER �
<br /> WILL BE SET AT MINIMUM POSITION, AND THE EXHAUST DAMPER WILL REMAIN CLOSED. WHEN THE ECONOMIZER IS I I I I I I Ia �
<br /> DISABLED AND THE UNIT IS IN UNOCCUPIED MODE, THE OUTDOOR AND EXHAUST AIR DAMPERS WILL BE CLOSED. ALL
<br /> DAMPER ACTUATORS WILL BE ELECTRIC.
<br /> TRIPLE DECK DAMPER
<br /> THE ZONE DAMPER WILL BE A 3-DECK DAMPER AND SHALL CONSIST OF HOT DECK, BYPASS (NEUTRAL) DECK, AND COLD
<br /> DECK. THE ZONE ACTUATORS WILL BE ELECTRIC.
<br /> DURING FULL COOLING DEMAND, THE COLD DECK DAMPER SHALL BE 100% OPEN, NEUTRAL AND HOT DECK DAMPERS
<br /> SHALL BE CLOSED. IF COOLING DEMAND DECREASES IN A ZONE, COLD DECK DAMPER SHALL MODULATE TOWARDS CLOSED -
<br /> POSITION, NEUTRAL DECK DAMPER SHALL MODULATE TO OPEN POSITION IN PROPORTION TO COLD DECK DAMPER. HOT
<br /> DECK DAMPER SNALL REMAIN CLOSED.
<br /> DURING FULL HEATING DEMAND, HOT DECK DAMPER SHALL 8E 100% OPEN, NEUTRAL AND COLD DECK DAMPERS SHALL
<br /> 8E CLOSED. IF HEATING DEMAND INCREASES IN A ZONE, HOT DECK DAMPER SHALL MODULATE TOWARDS OPEN
<br /> POSITION, NEUTRAL DECK DAMPER SHALL MODULATE TO CLOSED POSITION, IN PROPORTION TO HOT DECK DAMPER. COLD
<br />, DECK DAMPER SHALL REMAW CLOSED.
<br /> THE DAMPER OPERATION SHALL BE REVERSED IN THE EVENT THAT HEATING DEMAND DECREASES AND COOLING
<br /> DEMAND INCREASES. HOT DECK AND COLD DECK DAMPERS SHALL NOT BE OPEN AT THE SAME TIME. SIMULTANEOUS
<br /> NEATING AND COOLING SHALL NOT BE ALLOWED. IF THERE IS NO DEMAND FOR HEATING OR COOLING, THE ASSOCIATED HOT
<br /> AND COLD DECK DAMPERS SHALL BE CLOSED AND NEUTRAL DECK DAMPER SHALL BE 100% OPEN.
<br /> A SINGLE, MANUALLY ADJUSTABLE DAMPER IS PROVIDED BETWEEN THE HOT DECK AND COLD DECK OF THE UNIT TO
<br /> RESTRICT THE AIRFLOW TO THE BYPASS (NEUTRAL) DECK TO CREATE PRESSURE DROP REQUIRED FOR THE VSD TO SLOW THE
<br /> FAN SPEED. THE MANUAL DAMPER MUST BE SEf TO MINIMUM OUTSIDE AIR REQUIREMENTS BY THE AIR BALANCING
<br /> CONTRACTOR.
<br /> TRIPLE DECK MULTI-ZONE VAV MANUAL BYPASS DAMPER ADJUSTMENT
<br /> WITH COLD DECK FULLY OPEN (HOT & BYPASS DECK FULLY CLOSED) AND SUPPLY FAN RUNNING AT RATED
<br /> MAXIMUM FREQUENCY, BALANCE THE SYSTEM TO PRODUCE REQUIRED MAXIMUM CFM. RECORD THE STATIC
<br /> PRESSURE IN THE SUPPLY FAN PLENUM. INPUT THIS PRESSURE IN THE DDC SYSTEM FOR VAV CONTROL OF
<br /> THE SUPPLY FAN.
<br /> SLOWLY CLOSE THE COLD DECK DAMPERS COMPLEfELY. MAKE SURE THAT THE MANUAL BYPASS DAMPER IS
<br /> FULLY OPEN. WHEN THE COLD DECK IS COMPLETELY CLOSED THE BYPASS DECK SHOULD BE FULLY OPEN.
<br /> SLOWLY START TO CLOSE THE MANUAL BYPASS DAMPER TO ACHIEVE MINIMUM VENTILATION CFM, WHILE
<br /> ALLOWING THE DDC TO KEEP THE SUPPLY FAN PLENUM PRESSURE CONSTANT. RECORD THE FREQUENCY OF
<br /> THE SUPPLY FAN MOTOR DISPLAYED BY THE VSD ONCE THE MINIMUM VENTILATION CFM IS ACHIEVED.
<br /> AN EXAMPLE:
<br /> TOTAL CFM REQUIRED = 14,000 CFi�A
<br /> MINIMUM VENTILATION CFM REQUIRED = 2,000 CFM v/ �
<br /> WITH THE FAN RUNNING AT 60 HZ BALANCE THE SYSTEM TO ACHIEVE TOTA� AIRFLOW OF 14,000 CFM. READ W W
<br /> THE STATIC PRESSURE IN THE SUPPLY FAN COMPARTMENT AND LET'S SAY THIS STATIC PRESSURE IS 1.5"OF W.C. U U +�
<br /> INPUT THIS 1.5'STATIC PRESSURE IN THE DDC CONTROLLER. DDC CONTROLLER WILL SEND SIGNAL TO V5D � >
<br /> TO RAMP UP OR DOWN THE SUPPLY FAN SPEED TO MAINTAIN SUPPLY FAN PLENUM STATIC PRESSURE OF 1.5" N n/ Z
<br /> W.C. LL LL
<br /> W W O
<br /> CLOSE THE COLD DECK DAMPER; BYPASS DECK SHOULD BE FULLY OPEN. THE SUPPLY FAN SHOULD START TO �/� '^ �
<br /> v� v�
<br /> RAMP DOWN. SLOWLY (KEEPING IN MIND THAT THE VSD RAMPS AT A SPEED OF 1 HZ/5 SECONDS) CLOSE J J U
<br /> THE MANUAL BYPASS DAMPER TO ACHIEVE TOTAL CFM OF 2,000 CFM. RECORD THE FREQUENCY OF THE
<br /> SUPPLY FAN MOTOR. THE FREQUENCY SHOULD BE APPROXIMATELY 12 HZ. / ` �
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<br /> CHECKED BY: DATE PLOTTED:
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