Quotation are invited for Sup&Replac. Ac Units-2 Nos at 1172501132 Sup<(>&<)>replac. AC Units-2 Nos at Najma DCC Building Contact: Mr.Mohideen - 055-3810513 Payment Terms: 5% retention Site Visit Date: 24.10.2025 1 7000000011 DEWA-CONFIDENTIALSUPPLY AND REPLACEMENT OF EXISTING PACKAGE AC UNITS-2 NOS AT NAJMA DCCBUILDINGA.TECHNICAL SPECIFICATIONCONTRACTOR S COPE OF WORK:SUPPLY, INSTALLATION, TESTING AND COMMISSIONING OF NEW PACKAGE AC UNITSINCLUDING NEW DUCTING BRANCHES AND ACCESSORIES T O REPLACE EXISTING OLDPACKAGE UNIT AND CONNECTED DUCTING BRANCHES AT ROOF FLOOR OF NAJMA DCCBUILDING AS PER THE FOLLOWING DETAILS. T HE CONTRACTOR#S SCOPE ALSOINCLUDES REMOVAL OF THE OLD PACKAGE UNIT AND THE CONNECTED DUCTINGBRANCHES FROM THE BUILDING ROOF AND DISP OSAL AT DEWA CENTRAL SCRAP YARD.SI NO.BUILDINGDETAILS OF EXISTING ASSETACTUAL COOLING CAPACITYNEW ASSET NO.1NAJMA DCCDM150C00A7ARC3 (YORK)20 TR1210000112532NAJMA DCCDM150C00A7ARC3 (YORK)20 TR1210000112541.ENVIRONMENT FRIENDLY REFRIGERANT SHALL BE USED SUCH AS R 40 7C / R410A /R134A SUBJECT TO DEWA APPROVAL. (NOTE: PACKAGE A/C WITH OZONE DEPLETINGREFRIGERANT R-22 IS NOT ACCEPTABLE, AND NOT TO BE QUOTED. THE PACKAGEUNITS OF NOMINAL COOLING CAPACITY LESS THAN SPECIFIED ABOVE IS NOTACCEPTABLE, AND NOT TO BE QUOTED).2.THE PACKAG ED UNITS MAKE SHALL BE FROM ONE OF THE BRANDS PREVIOUSLYAPPROVED FOR DEWA (M/S SKM. CARRIER, DAIKIN, YORK, PETRA, MITSUBISHI) OFACCE PTABLE TECHNICAL PERFORMANCE, ENERGY EFFICIENT AS PER VALID ESMAAPPROVAL AND SUBJECT TO DEWA APPROVAL AS PER TECHNICAL EVALUATION PR IORTO ISSUANCE OF PO.3.THE PROPOSED PACKAGED UNIT/S DIMENSIONS SHALL MATCH THE SIZE OF THEEXISTING UNIT/S AT SITE OR ELSE, THE CONTR ACTOR SHALL ENSURE THAT THEREIS SUFFICIENT SPACE TO ACCOMMODATE THE INSTALLATION OF THE NEW UNIT/SWITHOUT HINDERING THE INGRESS/EGRE SS AND MAINTENANCE ACCESSIBILITY OFEXISTING UNITS.4.CONTRACTOR SHALL OBTAIN FROM ORIGINAL EQUIPMENT MANUFACTURER (OEM) ANDENCLOSE TH E DETAILS (MAKE AND ORIGIN) OF MAJOR COMPONENTS SUCH ASCOMPRESSOR, BLOWER MOTOR, EVAPORATOR COIL, CONDENSER COIL, EVAPORATORBLOWER, CONDENSER FAN AND MOTOR, EXPANSION VALVE, FILTER DRIER ETC.5.IN THE BUILDING, INTERNAL TEMPERATURE REQUIREMENT IS 20±2 °C INSIDEOFFI CE, CONSIDER THE EXTERNAL DESIGN AMBIENT CONDITIONS DBT 50DEG. C(MAX.) AND WBT 32DEG. C (MAX.) DURING SUMMER. ALL ITEMS OF PACKAGEDU NITS AND FIELD INSTALLED ITEMS SHALL BE DESIGNED TO OPERATE WITHOUTMALFUNCTION UP TO A MAXIMUM AMBIENTDEWA-CONFIDENTIALCONDITION OF 50°C D.B.T AND A MINIMUM AMBIENT CONDITION OF 1°C D.B.T,WITH INSTANCES OF 100% R.H. CONTRACTOR SHALL CONSIDER DESIGN EXTERNALSTATIC PRESSURE (ESP) OF AT LEAST 400PA, HOWEVER, CONTRACTOR SHALLESTIMATE ACTUAL ESP AS PER SITE CONDITION FOR SELECTION OF THE NEW UNITST O ENSURE THE COOLING CAPACITY AS MENTIONED ABOVE. EACH NEW PACKAGE UNITSHALL OPERATE IN CONJUNCTION WITH THE OTHER EXISTING PACKAGE UNIT/S INTHE SAME HVAC SYSTEM WITHOUT ANY MALFUNCTION IN (2 DUTY + 1 STANDBY)AUTO-MODE OR AS INSTRUCTED BY THE DEWA- ENGINEER-IN-CHA RGE OF THE SITE.THE HVAC SYSTEMS SHALL HANDLE PREDOMINANTLY RE-CIRCULATED AIR WITH ACONTROLLED QUANTITY OF FRESH AIR INTRODUCED AT R ETURN DUCT PLENUM.6.PACKAGE UNIT SHALL BE ONE PIECE PACKAGED AIR COOLED AC UNIT, TO ACHIEVETHE FOLLOWING FUNCTIONS AND MINIMUM:(A) DUAL REFRIGERANT CIRCUITS.(B) VIBRATION ISOLATION FOR INTERNAL OPERATING COMPONENTS.(C) HEATING OF COMPRESSORS DURING ST ANDBY MODE (CRANK CASE HEATER).(D) SIGHT GLASS TO MONITOR THE REFRIGERANT CIRCUIT.(E) FILTER DRIER REPLACEMENT SHALL BE POSSIBLE WIT HOUT LOSS OFREFRIGERANT AND CUTTING OF COPPER PIPES.(F) ELECTRIC ISOLATION AND EXTERNAL OVERLOAD PROTECTION FOR COMPRESSORS,BLOWER A ND CONDENSER FAN MOTORS.(G) UNDER VOLTAGE MONITORING.(H) EARTH LEAKAGE PROTECTION FOR THE COMPLETE UNIT.(I) CONTROL CIRCUIT SUPPLY S HALL BE 220V AC.(J) LOW AMBIENT PRESSURE CONTROL BY FAN CYCLING SWITCH(K) LEAD / LAG SWITCH FOR DUAL COMPRESSORS, INTERNAL PROTECTIO N, ANDSHORT CYCLING PREVENTION.(L) LOW-PRESSURE AND HIGH-PRESSURE SWITCHES FOR EACH CIRCUIT.(M) THERMOSTATIC EXPANSION VALVES FOR EA CH CIRCUIT.(N) ELECTRICAL AND CONTROL PANEL WITH WEATHER-PROOF ENCLOSURE WITHINTERNAL PARTITIONS.7.PROVISION FOR INDIVIDUAL FAULTS I NDICATION TO BE MADE ON AIRCONDITIONING UNITS CONTROL PANEL. MANUFACTURER SHALL ENSURE THATSUFFICIENT AUXILIARY CONTACTS ARE MADE AV AILABLE IN THE PACKAGED UNITSFOR INTERFACING WITH BMC SYSTEM.8.THE PACKAGE UNITS WITH MICROPROCESSOR CONTROLLER SHALL BE WITH DIGITA LDISPLAY OF FAULTS/FAULTS# LOG AND A PUSH BUTTON TO ENABLE RESETTING OFALARMS.DEWA-CONFIDENTIAL9.THE EVAPORATOR AND CONDENSER COILS SHALL BE COPPER PLATE FINSMECHANICALLY BONDED TO SEAMLESS COPPER TUBES, WITH ALL JOINTS BRAZED.GOOD QUALITY ANTI-CORROSION COATING S HOULD BE PROVIDED TO CONDENSERCOILS FROM FACTORY. CONDENSER COIL GUARD SHALL BE PROVIDED.10.THE UNIT CABINET SHALL BE CONSTRUCTED OF SUITABLE MATERIAL FOR OUTDOORINSTALLATION WITH WEATHER-PROOF CORROSION RESISTANT MARINE COATINGPAINT. EVAPORATOR PANELS SHOULD BE D OUBLE SKIN. THE CABINET PANEL SHALLBE EASILY REMOVABLE FOR SERVICE TO ALL COMPONENTS. UNIT SHALL BEDESIGNED TO EASILY DRAIN OUT THE CONDENSATE WATER.11.THE BLOWER SUPPLY FAN SHALL BE SELECTED TO ACHIEVE THE DESIGN AIR FLOWWITH DIRECT OR BELT DRIVEN TYPE, AS PER TH E SITE REQUIREMENT MATCHINGWITH OTHER PACKAGED UNIT/S IN THE SAME SYSTEM. FAN MOTOR SHALL BE WITHPERMANENTLY LUBRICATED BEARING. BLO WER FAN MOTOR SHALL BE SELECTED TOENSURE NON-OVERLOADING TYPE OPERATION WITH MINIMUM OF 10 % OF POWERRESERVE.12.THE CONDENSER FAN SH ALL BE OF THE PROPELLER TYPE WITH DIRECT DRIVEN,TOTALLY ENCLOSED, PERMANENTLY LUBRICATED MOTORS. THE CONDENSER FANSSHALL DISCHARGE U PWARDS. PACKAGE UNIT SHALL HAVE MINIMUM 2NOS. CONDENSERFANS. CONDENSER FAN MOTORS SHALL BE SUITABLE FOR OPERATION IN AN AMBIENTAIR T EMPERATURE OF 55°C.13.THE RETURN AIR FILTER SHALL BE 50MM THICK GOOD QUALITY ALUMINUM FILTER,WASHABLE TYPE AND SUITABLE FOR PERMANEN T USE. FILTER MEDIA SHALL BESUPPORTED IN RIGID PERIPHERAL; FRAMES WITH INTERNAL OR EXTERNAL PVCCOATED WIRE SUPPORT OF THE MEDIA TO E NSURE THAT THE MEDIA SHALL NOTCOLLAPSE UNDER AIRFLOW. THE HOLDING FRAMES SHALL INCORPORATE ACCURATELYSIZED CHANNEL SECTIONS TO PROVI DE A GOOD SLIDING FOR THE FILTERS.14.CONTRACTOR SHALL SUPPLY AND INSTALL ALL NECESSARY FIELD CONTROLS ANDCONTROL WIRING, INCLUDING BUT NOT LIMITED TO, DUTY CHANGE OVER,MANUAL/AUTO/OFF SELECTION, SUPPLY AIR TEMPERATURE SENSOR, DIFFERENTIALPRESSURE SWITCH, AIRFLOW S WITCH, RETURN AIR TEMPERATURE/HUMIDITY SENSORETC. NECESSARY FOR THE AUTOMATIC OPERATION OF THE NEW PACKAGED UNITS TOPROVIDE A SMOOTH HVAC SYSTEM CONTROL AND OPERATION IN THE SUBSTATION.CONTRACTOR SHALL CARRY OUT NECESSARY INTERLOCKING OF NEW PACKAGED UNITSWITH HVA C CONTROL PANEL OF THE SUBSTATION AS PER SITE CONDITION TOACHIEVE ALL DESIGNED OPERATIONS BOTH IN AUTOMATIC MODE (NORMAL MODE) ASWEL L AS IN MANUAL MODE UNDER MAINTENANCE CONDITIONS. THE UNITS SHALL BECONTINUOUSLY AVAILABLE FOR COOLING AND SHALL BE BY RETURN AIRTEM PERATURE/ HUMIDITY SENSORS TO ACHIEVE ON/OFF CONTROL OF COMPRESSOR.DEWA-CONFIDENTIAL15.REPLACE THE SUPPLY AND RETURN DUCT BRANCHES A ND THE DUCT SUPPORT OF OLDPACKAGE UNIT ON THE ROOF WITH NEW RECTANGULAR DUCTING MADE OF GI SHEETOF MINIMUM 0.8MM THICKNESS ALL AS PE R ASHRAE/ DW144/SMACNA. INSTALL NEWSUPPLY AND RETURN DUCTING BRANCHES IN ALIGNMENT WITH THE MOUTHCONNECTION OF NEW PACKAGET AC UNITS USING GOOD QUALITY FLEXIBLE DUCTCONNECTOR AT ONE END. THE SUPPLY AND RETURN AIR DUCTING ARRANGEMENT ANDMOUTH CONNECTIONS OF THE NEW PACKAGED AC UNITS SHALL MATCH WITH THEEXISTING ARRANGEMENT AT SITE TO ENSURE EASY CONNECTION AND SMOOTHAIRFLOW. THE NEW SUPPLY AND R ETURN DUCTING BRANCHES SHALL CONNECT WITHTHE EXISTING SUPPLY AND RETURN DUCT PLENUMS RESPECTIVELY AT THE OTHEREND. FOR ALL NEW DUCT BRANCHES CONNECTING WITH NEW PACKAGE UNITS,PROVIDE SUITABLE AND SUFFICIEN NUMBER OF DUCT SUPPORTS AS NECESSARY.THE SUPPORTS SHALL B E HOT DIPPED GALVANIZED, PRE-FABRICATED, BROUGHT ANDERECTED AT SITE BY THE CONTRACTOR. ALL THE ROOF DUCT SUPPORTS SHALL BEFIXED ON R EINFORCED CONCRETE PEDESTAL.16.THE CONTRACTOR SHALL SUPPLY AND PULL CABLES WITH KOPEX FLEXIBLE STEELCONDUIT FROM THE NEAREST DP TO T HE PACKAGE FEATURES, AS 2 EA STANDARD TERMS & CONDITIONS 1) Prices should be DDP delivery duty paid at DEWA stores. 2) Quotation to be submitted only in local currency U.A.E Dirhams 3) DEWA Standard payment terms is 30 days credit from the date of acceptance of material 4) No DEWA staff or his or her relatives up to third degree should have ownership or partnership in your company, and your participation in DEWA tenders / RFQs should not constitute a Conflict or perceived Conflict of Interest. Supplier Registration: https://srm.dewa.gov.ae/irj/portal/anonymous/regis Tender Link : https://srm.dewa.gov.ae/sap/opu/odata/sap/ZSRM_RFX_REG_BID_SRV/AttachmentSet(2492500697)/$value
