CWE/GGN/GT-40/2025-26 SPECIAL REPAIR/ REPLACEMENT OF BER PAC AND ALLIED ITEMS AT IMAC UNDER GE (AF) GURGAON

The indoor unit shall comprise of 1 Digital & 1 Fixed Scroll Compressor, corrossion resistant EC fans with in the indoor unit, Evaporator DX Cooling Coil with hydrophilic coating, Touch/Keypad Screen Display with Microprocessor controllers, Electronic Expansion valves, Heater and non electrode(Infrared) type humidifier, Driers, G4 Filter, Suction and Discharge piping, Internal power and Control wiring, Crankcase heaters, HP/LP Cutouts, Power and Control contactors, water leak detectors and Other Electrical accessories

S&F Gl frame work for seamless ceiling comprising of Gl perimeter channnel 0.55 mm thick with two unequal flanges of 20 and 30 mm and web of 27 mm fixed to surrounding mild steel frame work using nylon sleeves and screws at 450 mm centre to centre/intermediate channel 0.9 mm thick having two equal flanges of 15 mm each and web of 45 mm suspended from soffit at approx 900 mm centre to centre with Gl cleat and steel expansion fasteners with and including ceiling section (not exc 1.2 m length) of 0.55 mm thickness having kurled web of 50 mm and flange of 26 mm each with lips of 10.5 mm fixed to the intermediate channel with connecting clips across the intermediate channel at 457 mm centre to centre including Hangers 6 mm dia. G.I. (upto 1200mm length) adjusting level fixed to roof slabs by means of ceilling cleats made out of G.I. flat 40 x 3 mm size 60mm long and expansion hold fasteners 12.5mm dia. 40mm long complete all as specified and directed.

Dismantling Wall and ceiling boards (fibre, pulp, insulation, etc.) or insulation boards/slabs/ blankets, any thickness, including cover fillets all as specified and directed by Engr-in-Charge.

Supply and fixing Perforated particle board/ tiles 12 mm thick for insulation and accoustic purposes, 60x60 cm in size, fixed with nails to timber frame work or with staples on snap grid all as specified and directed by Engr-in-Charge.

Supply and fixing grid frame work suitable for plain / perforated raised floor system OA 60 (Office Access 600mmx600mm) with load capacity not less than 1200 Kg Extra heavy casino long term life (or equivalent) and complete all as specified and directed by Engr-in-Charge. Note : Flooring will measured and paid in seperate item)

Supply and fixing perforated raised floor system OA 60 (Office Access 600mmx600mm) with load capacity not less than 1200 Kg Extra heavy casino long term life (or equivalent) and complete all as specified and directed by Engr-in-Charge.

Supply and fixing raised floor system OA 60 (Office Access 600mmx600mm) with load capacity not less than 1200 Kg Extra heavy casino long term life (or equivalent) and complete all as specified and directed by Engr-in-Charge.

Taking down cement plaster on brick or stone or concrete surfaces of wall/ ceilings etc including raking out joints, hacking fr key, scrubbing down waith water etc and including removal of debris and rubbish from the site complete all as specified and directed by Engr-in-Charge.

M&L for rendering 5 mm thick in CM (1:3) on concrete ceiling surface complete all as specified and directed by Engr-in-Charge.

M&L for rendering 15 mm thick in CM (1:6) on fair faces of brick work or concrete surface finished even and smooth (without using extra cement) etc complete all as specified and directed by Engr-in-Charge.

M&L for preparing new plastered surface of walls/ceiling and applying two coats of oil bound distemper over pne coat of white wash complete all as specified and directed.

Cooling circuits One or Two refrigeration circuit(s), incorporating one high efficiency, fully hermetic Variable Scrolls with crankcase heater, air-cooled condenser, liquid receiver with outlet service valve, safety valve, filter drier, moisture indicating sight glass, liquid line solenoid valve and an electronic expansion valve directly controlled by the unit microprocessor to allow the highest energy saving. Each circuit is equipped with pre-set high-pressure switch and low-pressure transducer for protection against high condensing and low evaporating temperatures. The low-pressure transducer is managed by microprocessor controller, whilst to avoid compressor cycling at high discharge pressures, the high-pressure switch is equipped with a manual reset. The inclined evaporator coil is manufactured from copper tubes, mechanically bonded to hydrophilic painted aluminum fins, with a stainless-steel condensate drain pan. The large face area/low velocity coil allows precise control of temperature and humidity during cooling and dehumidification and is designed to optimize fluid velocity and minimize pressure drop. The evaporator shall be staged coil to allow a maximum efficiency on partial loads. The moisture indicating sight glass and liquid line solenoid valve for each circuit are mounted visible from a service window, immediately accessible once open the frontal door/s, to allow checking and adjustment while the unit is in operation.

Net Contract Sum will be after deducting Sch of Credit of Rs 5400.00

The Outdoor Condenser unit shall comprise of axail Condenser fans & motor, Condenser cooling coil (Copper coil with aluminium fins), fan speed controller, isolater switch. The matching air cooled condenser should be able to operate upto 48 Deg C of ambient temperatures.

The unit shall be suitable for operation on 415 Volts, 50 Hz, 3 Phase, 4 Wire AC supply. Each indoor unit should be having individual display panel, which shall display date, time, actual & set values, operating conditions, signal faults, collective faults, limiting values and PAC wellness alarm/service alarm to reduce the down time and unit memory shall hold the 400 most recent events with ID number, time and date stamp for each event. Unit should have Modbus and SNMP conectivity card.

Shifting of old outdoor unit from terrance of server room to scrap yard of store yard of AGE E&M

Low side work during replacement of new PAC units and paid sepaerately in the following items:-

Unloading, lifting, shifting & positioning during installation of the new PAC units.

Supply, Installation, Testing & Commissioning of hard drawn copper refregerant piping complete with fittings between indoor units and remote condensers. Refrigerant piping within the Server room and above ceiling and in comfort AC areas shall be insulated with 13mm thick closed cell elastomeric insulation with class 'O' fire retardant properties in tubing form. Piping shall be supported properly in a neat & clean manner using clamps & supports.

Copper refrigerant piping not less than 18 gauge thick for Precision Packaged units having single refrigerant circuits. Pipe- 7/8 for liquid line''

Copper refrigerant piping not less than 18 gauge thick for Precision Packaged units having single refrigerant circuits. Pipe-3/4 for liquid line''

S&F of extended piping kit complete with fittings.

Fixing only perforated/ plain raised floor system OA 60 (Office Access 600mm x600mm) with load capacity not less than 1200 Kg Extra heavy casion long term life incl refixing of frame work (or equivalent) complete all as specified and directed.

S&F Electrical copper Cabling (Armoured) considering the distance between indoor to outdoor-3 Core x 2.5 sq.mm

S&F Electrical power copper cable (Armoured) of size 3.5 Core 25 Sqmm for main power upto units with required gland, support and fittings.

S&F of CPVC pipes cut to required lengths and installed with all screwed joints for condensate drain. Quoted price shall be inclusive of supply and fixing in position the necessary fittings like elbows, tees reducers etc. and supporting arrangement in accordance with the approved shop drawings and specifications. Pipes shall be insulated with 6mm thick closed cell elastomeric insulation. Pipes shall be of following sizes : Drain piping 40 mm Dia

S&F MS base frame duly painted with the black enamel paint for mounting of Indoor unit and tubular MS base frame with adjustable legs duly painted for mounting of indoor unit.

S&F MS base frame duly painted with the black enamel paint for mounting of remote air cooled condensers with rubber pads for vibrations and required supoorting to hold on terrance.

Installation, positioning and commissioning of units. Commissioning of units should be done by OEM engineers after verification and complete check of installation as per OEM guidelines and under OEM engineer supervision.

S&F Refrigerant gas R407C/R410 to units with required compressor oil after complete pressure testing, vacumzing.

S&F of single louvered powder coated extruded aluminium supply air grilles in accordance with PAC OEM guidelines. Grilles shall be provided with removable key - operated volume control dampers. Grilles shall be strong enough suitable for floor installation. (600 mm X 600 mm).

S&F of one way blow linear supply cum return air grilles complete with removable/fixed core in accordance with PAC OEM guidelines. Powder coated aluminium grilles of extruded sections with integral flanges on both sides & ends as required complete with corner pieces. All grilles to be installed in ceiling to be properly supported from real slab using chains or gripple wires. (600 mm X 600 mm).

S&F fabricated double skin return air plenums with provision of motorized damper fixing. Plenum should have access for filters. Height of the plenum shall be as per approved drawing to touch the false ceiling for return air pick up return air plennum (2550 mm x 900 mm x 600mm).

S&F reputed make and suitable torque motorised damper with actuator to operate as per working and standby mode operation. Suitable for return air plenums (2550 mm x1970 mm x150mm).

S&F CPVC pipes cut to required lengths and installed with all screwed joints for Humidifier soft water supply. Quoted price shall be inclusive of supply and fixing in position the necessary fittings like elbows, tees, reducers, sockets etc. and supporting arrangement in accordance with the approved shop drawings and specifications. All pipe supports shall be of Galvanised Steel. All sleeves in Fire wall/slab shall be sealed using fireproof sealant. Pipes shall be of following sizes : 25 mm dia

Dismantling of existing old-age Stulz Make PAC units from location and shifting to scrap yard:-

Removal/ dismantling of Indoor/outdoor with connected accessories(piping cabling) units one by one as per engineer incarge instructions and permisssions.

Shifting of Indoor unit from Server Room to scrap yard/ store yard of AGE E&M

Components Included for DX units: (i) Individual double circuit - 1 Digital 1 Fixed Compressor scroll compressor for R410A refrigerant. (ii) Backward curved Fan with EC Motor. (iii) Evaporator Cooling Coil with electronic expansion valve for DX. (iv) Condenser with Axial Fan Motor with Fan speed control-1 circuit/unit with Anti corrsoive coating. (v) Microprocessor (ICOM) controller with Team mode, Load sharing, standy and Cascading feature. (vi) Steam non-electrode(Infrared) type humidifier to avoid any scaling and quick response. (vii) G4 Filter Clogged Fliter (95% down to micron) with feature of filter clog alarm. (viii) Card for BMS-Backnet/ Modbus and SNMP connectivity. (ix) Temperature and Humidity sensors. (x) Return Air: 24 Deg ± 1 Deg C. (xi) Humidity: 55 Deg ± 5 Deg C. (xii) Ambient Temp. 48 Deg C (xiii) External Static Pressure : 20 PA

THE AIR-COOLED PRECISION PACKAGE UNIT SHALL BE DESIGNED AS PER FOLLOWING CONDITIONS 1. Unit return air temperature : As per BoQ (Unit Shall be Compulsory capable of taking 40 Deg C As return Air temp) 2. Ambient air design température : 40 Deg C 3. Cooling Capacity : As per BoQ 4. Air Flow Direction : Bottom discharge-top return 5. Air inlet Temp & RH : Set point ± 1°C (DB) & Set point ± 5% (Return Air) 6. Air Quantity : Modulating as per server (110 cfm/kW (min) 7. Units should be able to provide 1 SHR at part load

Design Requirements The environmental control system shall be Factory assembled unit. It shall be floor mounted, optimized for maximum cooling capacity in a minimum footprint. It shall be specifically designed for service from the front of the unit. The system shall be designed for draw-through air arrangement to insure even air distribution to the entire face area of the coil. The unit shall modulate cooling capacity and airflow based on requirements. The unit shall be ready to allow the installation of shackles for top handling. Forklift handling should be possible as well.

Quality Assurance The specified system shall be factory end of line tested (functionality test) before shipment and designed to meet CE requirements. The system shall be designed and manufactured according to world-class quality standards. The manufacturer shall be ISO 9001 certified.

NOTES FOR PAC UNITS (ITEM No 13.00 of BOQ) GENERAL The AC Units should have high sensible heat ratios, to match high sensible loads of Computer/Server Rooms/ Switch room/UPS. A Microprocessor Controlled Precision package AC system with R-410a refrigerant (compulsory) shall be suitable to take thermal and air qty. inputs from the server and adjust its operation accordingly so as to achieve highest levels of performance and efficiency. The Indoor unit shall comprise of Variable Capacity Digital Compressor in independent or Tandem circuit, corrosion resistant EC fans, Evaporator DX Cooling Coil with hydrophilic coating, Microprocessor controllers, Expansion valves, Driers, G4 Filter, Suction and Discharge piping, Internal power and Control wiring, Crankcase heaters, Humidifier, Heaters, HP/LP Cutouts, Power and Control contactors, water leak detectors and Other Electrical accessories. Fixed capacity compressor technology like multiple scrolls or Fixed capacity Tandem scrolls are strictly not allowed. Systems should mandatorily be having variable capacity compressors and performance as per above specifications.

Cabinet The cabinet is manufactured from

galvanized steel sheet, externally painted with RAL 7021 colour epoxy-polyester powder paint and assembled using stainless steel screws and high tensile rivets. The rear and the fans section panels are double-skinned, with 20mm (frontal fan section panel with 40mm) Class ‘O’ (A1 EU) fireproof insulation sandwiched between the skins to reduce noise emission and heat loss. The side panels, which are isolated from the inside of the unit to form a complete double-skinned cabinet, the small service panel for electrical heaters, are also lined with 10mm Class ‘O’ (A1 EU) fireproof insulation . The frontal panel(s) are assembled on hinges to make the access easier; this can be opened by the fast closing lock. The rear and side panels are screwed to the supports. The rear panel(s) are screwed directly to the frame.

The humidification system is provided by an electronic control humidifier. The dehumidification function, which is supplied as standard when the humidifier option is installed, acts by reducing the fan speed with consequent reduction of the air flow and at the same time operating the variable capacity compressors at full capacity Humidification control may be of the proportional or of the on-off type, according to the requirements of the installation: on/off is set as standard. Any amongst the following two may be used for Humidification:

Humidifier. The unit Should be fitted with an Humidifier (Non Heating type) suitable for use with water of varying degrees of hardness. The humidifier Should be complete with a water inlet valve, and a maximum water level sensor; the humidifier Should include 3 high-intensity quartz lamps shine on water creating instantaneous moisture using almost any water quality. The cleanable stainless-steel humidifier pan is removable from front of the unit

Heating / reheating The heating resistors are of a rigid design for extended operational life and are normally utilized to maintain room dry-bulb conditions during a system call for dehumidification. Each stage of heaters is made of finned armoured stainless steel AISI 304 to maintain a low surfaces power density. Ionization effects are eliminated owing to the low heater surface temperature. Heating control is of the ON-OFF type. The heaters are phase balanced and are provided with a manual reset safety thermostat to disable them in the event of a high temperature. The heating system also incorporates Miniature Circuit Breaker(s) which protect the heater(s) from short circuits, should the harness be damaged accidentally.

Air filtration The standard filtration grade is G4 (95% down to 5 microns). The filter pleated structure gives high filtration efficiency, low pressure drop and permit to use the filter without metallic or cardboard frame. They are easily accessed/replaced by opening the front panels. The unit is fitted with a filter differential pressure switch, connected to the microprocessor controller to provide ‘Filter Clogged’ warning indication.

Electrical panel The electrical panel, located at the front of the unit in a compartment isolated from the airflow, contains the MCB’s, contactors, transformers, controller PCB, overload relays etc. Each high voltage system component is provided with an MCB over-current protective device. All high voltage components are touch protected by means of a plastic cover. The electrical panel complies with the IEC norm en60204-1. Electrical power supply is 400V (±10%) / 3Ph / 50Hz (±2Hz) +N +E and are fitted with a mains isolator, mechanically interlocked with the electrical panel cover.

Refrigerant piping: Each refrigerant circuit shall be suitable for operation on R410a and shall include the following items: (a) Expansion valve with pressure equalization; (b) Removable liquid line drier / filter. (c) Liquid line sight glass with moisture indicator. (d) Hand shut off valves.

Microprocessor controller The Control System is microprocessor based, 32 bit RISC. It can be programmed to control the function of every device within the unit via I/O. The controller allows setting and monitoring of the following room parameters via a 3 button keypad: • Air Temperature • Temperature set-point • Temperature band • Humidity • Humidity set-point • Humidity band The parameters are indicated using symbols and text on a back-lit, 3 digits Liquid Crystal Display. Cooling and heating modes are also indicated on the LCD screen. Alarm conditions activate a visual indicator. Three LED’s indicate the unit status – ‘Power on’ (Yellow), ‘Unit on’ (Green) and ‘Warning/Alarm activated’ (Red) The controller shall provide Unit to Unit Ethernet connection to operate with multiple units, run/stand-by rotation, automatic changeover and parameter sharing functions, external communications throug

The following warnings / alarms are included: • High temperature • Low temperature • High relative humidity • Low relative humidity • Humidifier failure • Fan failure • Electrical heater high temperature (When applicable) • Sensor failure • Controller errors Terminals are provided for remote start/stop control plus Volt-free ‘Common Alarm’ and ‘Unit Run’ indication The display shall provide with track recorded of temperature and humidity with graphically display on the screen. A buzzer provides audible indication of a ‘Warning’ or ‘Alarm’ condition Unit memory shall hold the 200 most recent alarms with time and date stamp for each alarm Unit memory shall hold the 400 most recent events with id number, time and date stamp for each event Menu shall display accumulative component operating hours for major components including compressors, fan motor, humidifier and reheat.

h BMS, sequential auto restart timer, with adjustable time delays to be applied to unit restart after a power loss.

Safety interlocks: Operation of heaters & humidifiers shall be possible only when blower fan is in operation. Fire detection signal from fire detector system shall be able to switch off the package unit operation in event of fire in conditioned space.

Monitoring The unit shall be supplied with suitable card for both SNMP & Modbus connectivity.

Fan section The unit is fitted with one (two,three) direct-driven, high efficiency, single inlet, backward curved, centrifugal ‘plug’ type innovating EC fan(s). The fan(s) have an impeller with curved blades corrosion resistant made of fibreglass plastic. This new technology allows keeping the current high strength of aluminium alloy adding the benefits of light weight and full flexibility on blade design of the new material. The good dampening behavior of the plastic also helps to reduce noise emissions. The fan motors are Electronically Commutated, IP54, with internal protections, continuous speed regulation via controller signal. The motor is three-phase with IP54 protection; provided with internal thermal protection. The fan wheel is statically and dynamically balanced; the bearings are self-lubricating. Between the fans shall be installed an “S” shape separator design to eliminate turbulence effects of one fan to the others; it shall be also designed to increase efficiency compared to simple plate separator. Fan(s) removal(s) shall be made faster thanks to the use of buttonhole specifically designed and tested to allow 10 cm increasing height during the operation.

Electrical work Each Precision AC unit should be provided with in-built electrical panel. Necessary 415 Volts +/- 10%, 3 Phase, 4 Wire (With Neutral), 50 Hz +/- 5% Power shall be provided by Customer at each unit’s electrical panel. Balance distribution of Power is in the Scope of Bidder. All Electrical cabling should be of armored Copper.