SOW HVAC and Electrical 06OCT2021.pdf

HVAC AND ELECTRICAL COMPONENTS REPLACEMENT WORK

KUWAIT AIR DEFENSE SUBHAN, KUWAIT

STATEMENT OF WORK

1. General Description of Services

Provide the products and services described in this statement of work for the following facilities which are all located inside the ADA Camp at Subhan, Kuwait:

Item NO Building Name Building Code

1.1 B2-ADMIN

1.2 B4-MESS (RESTAURANT)

1.3 B5-MAZHA (OFFICERS ACCOMMODATION)

1.4 MASRA/BADALAH (THEATRE)

1.5 SKY GUARD 147

1.6 ICC

1.7 BR 3/4

1.8 K 47/48

1.9 AR 3/2

1.10

MAGWA-ADMIN

MAGWA-RADAR

2. Period of Performance

Complete all requirements contained in this statement of work within 365 calendar days after Notice to Proceed

(NTP).

3. Work Summary

This Statement of Works (SOW) for the KUWAIT AIR DEFENSE, SUBHAN KUWAIT

(MECHANICANL SOW SUMMARY)

3.1 HVAC units to be removed and replaced are as stated in the tabulation below:

ITEM DESCRIPTION UOM QTY

3.1.1 B2-ADMIN

DX Package AC unit 20 TOR Capacity complete with duct heaters EACH 1

DX Package AC unit 15 TOR Capacity complete with duct heaters EACH 1 DX Package AC unit 12 TOR Capacity complete with duct heaters EACH 2 DX Split AC unit 25 TOR Capacity complete with duct heaters EACH 2 DX Split AC unit 12 TOR Capacity complete with duct heaters EACH 2 DX Split AC unit 10 TOR Capacity complete with duct heaters EACH 2

3.1.2 B4-MESS (Restaurant) DX Package AC unit 30 TOR Capacity complete with duct heaters EACH 2 DX Package AC unit 25 TOR Capacity complete with duct heaters EACH 4

3.1.3 B5-MAZHA (officers Accommodation) DX Package AC unit 15 TOR Capacity complete with duct heaters EACH 8

3.1. 4 MASRA/BADALAH (Theatre) DX Split AC unit 15 TOR Capacity complete with duct heaters EACH 4 DX Package AC unit 7.5TOR Capacity complete with duct heaters EACH 1

3.1.5

SKY GUARD 147

DX Package AC unit 16 TOR Capacity complete with duct heaters EACH 4 DX Package AC unit 13 TOR Capacity complete with duct heaters EACH 2 DX Package AC unit 20 TOR Capacity complete with duct heaters EACH 4 DX Package AC unit 26 TOR Capacity complete with duct heaters EACH 1 DX Split AC unit 4 TOR Capacity complete with duct heaters EACH 1

3.1.6

ICC

DX Package AC unit 25 TOR Capacity complete with duct heaters EACH 1

3.1.7

BR 3/4

DX Split AC unit 30 TOR Capacity complete with duct heaters EACH 2 DX Split AC unit 25 TOR Capacity complete with duct heaters EACH 4

3.1.8 K 47/48 DX Package AC unit 30 TOR Capacity complete with duct heaters EACH 2 DX Package AC unit 25 TOR Capacity complete with duct heaters EACH 2

3.1.9

AR 3/2

DX Split AC unit 30 TOR Capacity complete with duct heaters EACH 2

DX Split AC unit 25 TOR Capacity complete with duct heaters EACH 4

3.1.10

MAGWA-ADMIN

DX Package AC unit 20 TOR Capacity complete with duct heaters EACH 2

MAGWA-RADAR

DX Package AC unit 10 TOR Capacity complete with duct heaters EACH 1 DX Package AC unit 7.5TOR Capacity complete with duct heaters EACH 1

(ELECTRICAL SOW SUMMARY)

3.2 Procure and Supply Main Distribution Board for Individuals’ Dormitories:

ITEM Description UOM QTY K47/48

3.2.1

Procure and supply MSB Main incomer 800 A, Adjustable TMD, TP and SP, Outgoing 14-way 125, 160A Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 1

AR 3/2

3.2.2

Procure and supply MSB Main incomer 800 A, Adjustable TMD, TP and SP, Outgoing 16-way 125, 160A Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 2

BR 3/4

3.2.3

Procure and supply MSB Main incomer 800 A, Adjustable TMD, TP and SP, Outgoing 16-way 125, 160A Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 2

B2 ADMIN

3.2.4

Procure and supply MSB Main incomer ACB 1600 A, Adjustable TMD, TP and SP, Outgoing 20-way 100-125 A Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 1

B4-MESS (Restaurant)

3.2.5

Procure and supply MSB Main incomer 630 A, Adjustable TMD, TP and SP, Outgoing 14-way 100, 125,160 A Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 1

3.2.6

Procure and supply MSB Main incomer 630 A, Adjustable TMD, TP and SP, Outgoing 16-way 100, 125,160 A Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 1

B5-MAZHA (officers Accommodation)

3.2.7

Procure and supply MSB Main incomer 630 A, Adjustable TMD, TP and SP, Outgoing 14-way 100, 125,160 A Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 1

3.2.8

Procure and supply MSB Main incomer 630 A, Adjustable TMD, TP and SP, Outgoing 14-way 100, 160 A Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 1

ICC

3.2.9

Procure and supply MSB Main incomer 1000 A, Adjustable TMD, TP and SP, Outgoing 18-way 100, 125,160 A Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 1

MASRA/BADALAH (Theatre)

3.2.10

Procure and supply MSB Main incomer 800 A, Adjustable TMD, TP and SP, Outgoing 16-way 125,160 A Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 1

Sky Guard

3.2.11

Procure and supply MSB Main incomer 630 A, Adjustable TMD, TP and SP, Outgoing 16-way 32, 63, 100 A Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 1

3.2.12

Procure and supply MSB Main incomer 315/400 A Adjustable TMD, TP and SP, Outgoing 10-way 32, 40, 63 A, DB 8 way with incomer ELCB.

Digital multimeter, ELR for HVAC MCCBs, indication lamps

Each 1

TOTAL 14

3.3 HVAC Unit Steel Base Stand and Supports:

3.3.1. Roof Mounted Units-work shall include the removal all the steel base stands and supports associated with the old AC units with all connected accessories; and to replace with new base stands and necessary supports which shall match the requirements of the new AC units and accessories.

3.3.2. Platform Mounted Units- work shall include the cleaning, removing of rust/rust treatment, anti-corrosion surface treatment, repainting with new weatherproof paint and modifying the existing platform to match the new units completed with all required accessories to make the new steel platform code compliant.

3.4 Repair and Modification of the Electrical Works:

3.4.1. Electrical Power. Removal of all the electrical power connection cables from the existing AC unit up to its dedicated isolator switch; and to Procure and supply new electrical power connection which will include the cables, conduits, trays and unit isolator switch.

3.4.2. Electrical Controls. Remove the existing electrical control (temperature control) wiring from the unit, its control wiring, and to include the room thermostat. To supply and install new electrical controls (temperature control) - a programmable room thermostat with duct mounted sensor - to match with the operation of the new AC unit which will include the wiring, conduits and a new duct mounted thermostat sensing element to be installed on the main return duct and room temperature controller to be located in its present location or as directed by the Contracting Officer (KO).

3.4.3 Electrical MSBs, Removal of main switch boards and its related accessories, and to supply new MSBs at mentioned building.

3.4.4 Electrical cables, exchanging of power cables between, isolator - DB and outgoing from new MSBs for new HVAC units by providing all related accessories.

3.5 HVAC Ducting and Duct Connection Accessories:

3.5.1. Replace exterior ducting connection and all related accessories of the existing dx and AHU.

AC unit: and to Procure and supply new duct connection as required for the new AC unit installation.

3.5.2. Removal of the related duct accessories i.e. humidifier, smoke detectors, heaters, etc.

3.5.3. Procure and supply of duct and related accessories i.e., humidifier, smoke detectors, heaters, etc. required in the proper operation of the HVAC system.

3.6 Procure and supply new copper pipes connection from outdoor to indoor units for split units only:

Contractors have to Procure and supply copper pipes (copper tubing to ASTM Specifications B.88 Type “K”) connection between outdoor unit to indoor units with thermal insulation with canvas and foster for pipes exposed to atmosphere (outdoor piping).

3.7 Duct Cleaning and Inspection of Existing Ducting:

To provide duct and diffusers cleaning for all existing internal ducting of the AC units being replaced. The Contractor shall photo and video document the condition of the existing ducting system before and after duct cleaning has been completed. The Contractor shall also take note of and include in his report any damage or issues regarding the existing ducting system and shall include this information in its inspection report.

3.8 Site Debris Collection and Disposal:

To remove debris from the site; and to dispose as per Contracting Officer’s (KO) instructions in coordination with the base authorities. The Contractor shall maintain proper housekeeping at the site at all times.

3.9 Scope of Works Limitations:

Note that this scope is limited to the work stated and does not include any repairs, modifications, or adjustments to the internal ducting, for all buildings.

4. Site Access, Visit, Inspection and Verification Works:

These requirements are the criteria for the site visit, inspection and verification works portion of this scope:

4.1. Site Access.

The Contractor shall be responsible for securing the necessary access in the performance of this requirement. The Contractor shall notify the KO and COR of any issues with accessing the project site, including obtaining installation access, and shall coordinate with the COR in advance as necessary to secure site access. The Government shall have no responsibility for securing site access for the Contractor but may provide documentation or contact local authorities if requested by local authorities. The Contractor shall be responsible for completing all processes necessary to obtain the necessary access for material, manpower and equipment so as not to affect the schedule and execution of the works.

4.2. Site Visit:

It is the Contractor’s responsibility to visit the site as often as required in the execution of the works indicated in this scope.

4.3. Site Inspection:

The Contractor shall do all the required site inspection and coordinate all the activities, findings, issues and other concerns arising from the site inspections which will affect the execution of the scope of works and are to be coordinated with the KO. The Contractor shall inspect the site, capture all relevant information and reflect the gathered information by submitting scaled shop drawings of the existing site conditions which are relevant to the installation. The inspection shall take into consideration all aspects of the required HVAC, electrical works to include the architectural, civil, mechanical, and electrical works.

5. Removal and Disposal:

These requirements are the criteria for the disposal and removal portion of this scope:

5.1. Removal Works:

5.1.1. Removal Works. The Contractor shall coordinate with the KO and all relevant authorities in ensuring the safe execution of the works indicated in this scope. This will include but not be limited to ensure that all safety and security procedures are observed and followed in all stages of the works; coordinating and install temporary fencing for the whole site, work area, and lay down areas; placing of safety signage and warning labels which are clearly visible; identifying and de-energizing the power supplies serving the existing AC units and their related accessories;

providing sufficient advance notification to the KO and relevant authorities regarding the scheduled date of demolition; and proposing and executing a plan that will limit the disturbance to the day to day operation of the facility.

5.1.2. Removal Works. The Contractor shall remove the existing AC units, MSBs, and all the related items to including but not limited to the scope of work like; cladding; external (supply and return) ducting connections and related accessories (i.e., heaters, dampers, ducts, insulation, duct supports, fresh air intake assemblies, air filters, duct mounted smoke detectors, etc.); unit base stand and supports; condensate drain lines; flashing; and all items related to AC units and external duct connections. Electrical items related to the SOW (i.e., power supply isolators, room thermostats, conduits, wiring, cable trays, glands and etc.).

5.2 Disposal:

5.2.1. The Contractor shall coordinate with the KO regarding proper disposal of all debris from the Kuwait Air Defense Camp. The Contractor shall maintain a safe, clean and efficient work site.

5.2.2. The Contractor shall remove all debris, discarded equipment, and refuse from the Kuwait naval force Camp.

The Contractor shall coordinate with the KO and all relevant authorities in the proper sorting/classifying of the materials; coordinate the approved methods of disposal for each of type of the sorted materials; and perform all works required for the proper disposal of the materials in compliance with all applicable codes and standards.

6. Specific Requirements:

The following specific requirements are the criteria applicable to the execution and completion of the entire scope of work under the contract:

6.1 Mechanical:

The Contractor shall execute the works in full compliance with all the provisions of all applicable international codes and standards (i.e., ASHRAE, SMACNA, NFPA, ASTM, etc.); and Kuwait Ministry Standards and Codes (MEW, MPW, MEP, KFD). Any conflict among applicable codes and standards must be brought to the attention of the Contracting Officer for resolution. The Contracting Officer shall be entitled to require that work comply with any and, if possible, all of the applicable codes and standards without any increase in the Contract price.

6.1.1 HVAC Direct Expansion (DX) Package Unit.

The standard HVAC dx package unit shall comply with the following requirements as a minimum:

6.1.1.1. Direct Expansion (dx) Package Units. The AC unit shall be either horizontal discharge or bottom discharge to be similar to the existing installation configuration. The unit must be of internationally reputed and approved make and must have an undisputed record of performance. Units shall be factory assembled, pre-charged, prewired and tested in accordance with ASHRAE 15 at the factory and be suitable for the working pressure of the installed system. Each unit shall consist of compressor(s), condenser, evaporator, expansion valve, filter drier, sight glass, interconnecting refrigerant pipe work and all other standard accessories and controls.

6.1.1.2. Refrigerants. The refrigerant to be used will be R410A or an approved alternative specifically approved by the Government. The AC unit will utilize refrigerants that shall have an Ozone Depletion Factor (ODF) of 0.05 or less. The ODF shall be in accordance with the "Montreal Protocol on Substances That Deplete the Ozone Layer," September 1987.

6.1.1.3. AC Unit Casing. The casing of the AC Unit shall be of weatherproof construction, suitable for outdoor installation, made of heavy gauge galvanized steel, baked enamel finish. Top, bottom and sides of evaporator section shall be insulated with 25 mm thick, fiber glass or equivalent. Evaporator of double skin construction is also acceptable. All panels shall be easily removable, and all components must be easily accessible for servicing.

Evaporator section shall have a suitable insulated drain pan and drain connections.

6.1.1.4. Compressor. Compressor shall be direct drive, semi-hermetic or hermetic reciprocating, or scroll type capable of operating at partial load conditions. Compressor shall be capable of continuous operation down to the lowest step of unloading as specified. Compressors of 35 kW (10 tons) and larger shall be provided with capacity reduction devices to produce automatic capacity reduction of at least 50 percent. If standard with the manufacturer, two or more compressors may be used in lieu of a single compressor with unloading capabilities, in which case the compressors shall operate in sequence, and each compressor shall have an independent refrigeration circuit through the condenser and evaporator. Compressors shall start in the unloaded position. Each compressor shall be provided with vibration isolators, crankcase heater, thermal overloads, lubrication pump, high- and low-pressure safety cutoffs and protection against short cycling designed for continued operation to 52 degrees C (125 degrees F).

6.1.1.5. Integral Air Coils. Evaporator and condenser coils shall have copper tubes of 10mm (3/8 inch) minimum diameter with copper or aluminum fins that are mechanically bonded or soldered to the tubes. Maximum number of fins shall not exceed 14 per 25 mm. Coils shall be protected with a minimum 0.076 mm (3 mil) thick phenolic coating. Casing shall be galvanized steel or aluminum. Contact of dissimilar metals shall be avoided. Coils shall be tested in accordance with ASHRAE 15 at the factory and be suitable for the working pressure of the installed system. Each coil shall be dehydrated and sealed after testing and prior to evaluation and charging. Each unit shall be provided with a factory operating charge of refrigerant and oil. Separate expansion devices shall be provided for each compressor circuit.

6.1.1.6. Condenser. The Condenser fans shall be propeller type with aluminum or steel blades, direct driven, upward discharge, provided with protective screen mounted to the casing. Condenser fan motor shall have drip proof enclosure and with Class “E” rated insulation.

6.1.1.7. Evaporator. Evaporator coil face velocity shall not exceed 2.8 m/sec. Evaporator fans shall be forward curved design and sized to suit the system pressure. Evaporator fan motors shall be installed on an adjustable base and secured by a locking device. Fan drive shall be through adjustable pitch pulley. Fan shall be provided with seal and permanently lubricated ball or sleeve bearings, and the entire fan assembly shall be statically and dynamically balanced. The evaporator fan motor shall have a drip proof enclosure with a Class “A” insulation.

6.1.1.8. Refrigeration Circuit. Refrigerant containing components shall comply with ASHRAE 15 and be factory tested, cleaned, dehydrated, charged, and sealed. Refrigerant charging valves and connections, and pump-down valves shall be provided for each circuit. Filter-drier shall be provided in each liquid line and be reversible-flow type. Refrigerant flow control devices shall be an adjustable superheat thermostatic expansion valve with external equalizer matched to coil, capillary or thermostatic control, and a pilot solenoid controlled, leak-tight, four-way refrigerant flow reversing valve.

6.1.1.9. Control Wiring and Protection Devices. The control voltage shall be 24 volts and the AC units being offered must feature the following minimum requirements of safety, interlocking and protection devices:

6.1.1.9.1. Safety electrical interlocking of evaporator fan motor with compressor / heaters operation and mechanical interlocking through an air flow switch, wherever duct heaters are provided.

6.1.1.9.2. Where multiple compressors are incorporated in the units their operation must be in sequence in accordance with return air temperature.

6.1.1.9.3. Manual reset and adjustable high pressure and adjustable automatic low-pressure cutout for compressor protection.

6.1.1.9.4. Manual reset and adjustable oil pressure differential cutout of 90 secs. / 120 secs.

Trip time rating for compressors of 25 HP and above.

6.1.1.9.5. Time guard circuit for preventing compressor rapid recycling preferably of adjustable range from 5 minutes to 15 minutes.

6.1.1.9.6. Time delay relay for sequence starting of multiple compressors system of minimum 15 sec. delay rating.

6.1.1.9.7. Separate single phasing preventer suitable for three phase, 415 volts, 50 Hz power supply to prevent the whole unit from single phasing with a response time rating of maximum 2.0 secs.

6.1.1.9.8. Inherent thermal protection for compressor motor winding, three phase evaporators fan and condenser fan, motor windings.

6.1.1.9.9. Inherent thermal protection or manual reset thermal or magnetic overloads for single phase condenser and evaporator fan motors.

6.1.1.9.10. External overload with manual reset or MCCB of suitable rating for all 3 phases motors in addition to items stated previously.

6.1.1.9.11. The unit shall be controlled by a room thermostat equipped with duct mounted sensor. The room thermostat shall be housed in a suitable perforated transparent casing with a lock.

6.1.1.10. Air Filter Plenums. Both types of air filter plenums shall be installed and arranged in straight bank or V arrangement depending on each location and space. Filter plenums shall be installed complete with their necessary filter box and access doors in the air intake ducts in such a way as to eliminate air leakage of by-pass and to be easily serviceable. The types of filters are as follows:

6.1.1.10.1. Return Air Filter Plenum. Return air filter plenum shall be an integral part of the unit, factory assembled.

Plenum shall be suitable for accommodating 50 mm. thick metallic cleanable filters with a face velocity not exceeding 250 fpm. However, equal and approved field installed filter plenums are also acceptable.

6.1.1.10.2. Fresh Air Intake Assembly. The fresh air intake assembly shall consist of the outside air intake sand trap type louver, bird screen, outside air filters, and manual volume control dampers. Outside air filters shall be permanent heavy-duty metal cleanable type minimum 4" thickness. Filters shall be sized to perform their duty with a face velocity not more than 300 fpm.

6.1.1.10.3. AC Unit Base Stand. The Contractor shall procure, and supply AC unit steel base stand as required for the installation requirements of the new AC units.

6.1.2 HVAC Direct Expansion (dx) Split System Units:

The basic HVAC dx split unit shall comply with the following requirements as a minimum:

6.1.2.1. Direct Expansion (dx) Split Units. The unit must be of internationally reputed and approved make and must have an undisputed record of performance. Units shall be factory assembled, pre-charged, prewired and tested in accordance with ASHRAE 15 at the factory and be suitable for the working pressure of the installed system. Each unit shall consist of an evaporator / indoor / air handling unit and a matching remote air-cooled condensing unit.

Both the evaporator and condenser units shall be from the same manufacturer. A typical split AC unit shall consist of compressor(s), condenser, evaporator, expansion valve, filter drier, sight glass, interconnecting refrigerant pipe work and all other standard accessories and controls.

6.1.2.2. Refrigerants. The refrigerant to be used will be R410a or an approved alternative specifically approved by the KO. The AC unit will utilize refrigerants that shall have an Ozone Depletion Factor (ODF) of 0.05 or less. The ODF shall be in accordance with the "Montreal Protocol on Substances That Deplete the Ozone Layer," September 1987.

6.1.2.3. Evaporator Section. The evaporator section shall consist of an evaporator coil, fan, motor and drive, and expansion valve all factory assembled in one casing.

6.1.2.3.1. Unit Casing. The casing shall be constructed of heavy gauge galvanized sheet baked enamel finish. Top, bottom and sides of the evaporator units shall be insulated with 25mm thick fiber glass or equivalent. Double skin construction is also acceptable. All panels shall be easily removable, and all components must be easily accessible for servicing.

6.1.2.3.2. Evaporator coil face velocity shall not exceed 2.8 m/sec.

6.1.2.3.3. Evaporator fans shall be forward curved design and sized to suit the system pressure.

6.1.2.3.4. Evaporator fan motors shall be installed on an adjustable base and secured by a locking device.

6.1.2.3.5. Fan drive shall be through adjustable pitch pulley.

6.1.2.3.6. Fan shall be provided with seal, permanently lubricated ball or sleeve bearings and the entire fan assembly shall be statically and dynamically balanced. The evaporator fan motor shall have a drip proof enclosure with a Class “A” insulation. The evaporator section shall have a suitable insulated drain pan and drain connections.

6.1.2.4. Condenser Section. The condenser section shall be air cooled, of weatherproof construction, suitable for outdoor installation, made of heavy gauge galvanized steel, baked enamel finish. The unit shall be complete with its own compressor(s), motors, fans, starters, relays and other standard accessories and controls.

6.1.2.4.1. The Condenser fans shall be propeller type with aluminum or steel blades, direct driven, upward discharge, provided with protective screen mounted to the casing.

6.1.2.4.2. Condenser fan motor shall have drip proof enclosure and with Class “E” rated insulation.

6.1.2.5. Compressor. Compressor shall be direct drive, semi-hermetic or hermetic reciprocating, or scroll type capable of operating at partial load conditions. Compressor shall be capable of continuous operation down to the lowest step of unloading as specified.

Compressors of 35 kW (10 tons) and larger shall be provided with capacity reduction devices to produce automatic capacity reduction of at least 50 percent. If standard with the manufacturer, two or more compressors may be used in lieu of a single compressor with unloading capabilities, in which case the compressors shall operate in sequence, and each compressor shall have an independent refrigeration circuit through the condenser and evaporator. Compressors shall start in the unloaded position. Each compressor shall be provided with vibration isolators, crankcase heater, thermal overloads, lubrication pump, high- and low-pressure safety cutoffs and protection against short cycling designed for continued operation to 52 degrees C (125 degrees F).

6.1.2.6. Integral Air Coils. Evaporator and condenser coils shall have copper tubes of 10 mm (3/8 inch) minimum diameter with copper or aluminum fins that are mechanically bonded or soldered to the tubes. Maximum number of fins shall not exceed 14 per 25 mm.

Coils shall be protected with a minimum 0.076 mm (3 mil) thick phenolic coating. Casing shall be galvanized steel or aluminum. Contact of dissimilar metals shall be avoided. Coils shall be tested in accordance with ASHRAE 15 at the factory and be suitable for the working pressure of the installed system. Each coil shall be dehydrated and sealed after testing and prior to evaluation and charging. Each unit shall be provided with a factory operating charge of refrigerant and oil. Separate expansion devices shall be provided for each compressor circuit.

6.1.2.7. Refrigeration Circuit. Refrigerant containing components shall comply with ASHRAE 15 and be factory tested, cleaned, dehydrated, charged, and sealed. Refrigerant charging valves and connections, and pump-down valves shall be provided for each circuit.

Filter-drier shall be provided in each liquid line and be reversible-flow type. Refrigerant flow control devices shall be an adjustable superheat thermostatic expansion valves with external equalizer matched to coil, capillary or thermostatic control, and a pilot solenoid controlled, leak-tight, four-way refrigerant flow reversing valve.

Refrigerant piping assembled at site shall consist of copper tubing to ASTM Specifications B.88 Type “K” hard drawn and soldered joints. Fittings shall be of wrought copper of fine cast brass. Where required for gauges etc., tubing not larger than 10 mm diameter may be of type “K” soft annealed with flared tube or double ferrule compression fittings suitable for high pressure. Flux and solder as recommended by the manufacturers of tubing and fittings only shall be used during installation.

Refrigerant piping shall be installed so as to ensure continuous and automatic return of oil to the compressor.

Gauges and meters etc., supported directly on piping shall be properly levelled.

Refrigerant stop valves shall be back seating, key operated, seal cap type. Valves which are in constant use shall have hand wheels and shall be packless type. Valves connected in copper tubing shall have solder type ends or flanged ends and soldered flanged adaptors.

Accessories for field assembled systems like oil separators, liquid receivers, heat exchangers, expansion valves, etc.

shall be installed as per manufacturer’s recommendations and specifications.

Replacement core type filter drier with by-pass valves and liquid sight glass shall be provided.

Pump down system shall be provided for each unit.

6.1.2.8. Control Wiring and Protection Devices. The control voltage shall be 24 volts and the AC units being offered must feature the following minimum requirements of safety, interlocking and protection devices:

6.1.2.8.1. Safety electrical interlocking of evaporator fan motor with compressor / heaters operation and mechanical interlocking through an air flow switch, wherever duct heaters are provided.

6.1.2.8.2. Where multiple compressors are incorporated in the units their operation.

6.1.2.8.3. Manual reset and adjustable high pressure and adjustable automatic low pressure cutout for compressor protection.

6.1.2.8.4. Manual reset and adjustable oil pressure differential cutout of 90 secs. / 120 secs.

Trip time rating for compressors of 25 HP and above.

6.1.2.8.5. Time guard circuit for preventing compressor rapid recycling preferably of adjustable range from 5 minutes to 15 minutes.

6.1.2.8.6. Time delay relay for sequence starting of multiple compressors system of minimum 15 sec. delay rating.

6.1.2.8.7. Separate single phasing preventer suitable for three phase, 415 volts, 50 Hz power supply to prevent the whole unit from single phasing with a response time rating of maximum 2.0 secs.

6.1.2.8.8. Inherent thermal protection for compressor motor winding, three phase evaporator fan and condenser fan, motor windings.

6.1.2.8.9. Inherent thermal protection or manually reset thermal or magnetic overloads for single phase condenser and evaporator fan motors.

6.1.2.8.10. External overload with manual reset or MCCB of suitable rating for all 3 phases motors in addition to items stated previously.

6.1.2.8.11. The unit shall be controlled by a room thermostat equipped with duct mounted sensor. The room thermostat shall be housed in a suitable perforated transparent casing with a lock.

6.1.2.9. Air Filter Plenums. Both type of air filter plenums shall be installed and arranged in straight bank or V arrangement depending on each particular location and space. Filter plenums shall be installed complete with their necessary filter boxes and access doors in the air intake ducts in such a way as to eliminate air leakage of by-pass and to be easily serviceable. The types of filters are as follows:

6.1.2.9.1. Return Air Filter Plenum. Return air filter plenum shall be an integral part of the unit, factory assembled.

Plenum shall be suitable for accommodating 50 mm. thick metallic cleanable filters with a face velocity not exceeding 250 fpm. However, equal and approved field installed filter plenums are also acceptable.

6.1.2.9.2. Fresh Air Intake Assembly. The fresh air intake assembly shall consist of the outside air intake sand trap type louver, bird screen, outside air filters, and manual volume control dampers. Outside air filters shall be permanent heavy-duty metal cleanable type minimum 4" thickness. Filters shall be sized to perform their duty with a face velocity not more than 300 fpm.

6.1.2.10. AC Unit Base Stand. The Contractor shall procure and supply AC unit steel base stand as required for the installation requirements of the new replacement AC units.

6.1.3 Thermal Insulation:

The thermal insulation, shall comply with but not is not limited to the Thermal insulation shall be of an approved material with thermal conductivity not higher than 0.042 W/m deg C (0.29Btuh/hr. ft. sq. deg F inch) measured at an average temperature of 56 deg C (100 deg. F.) The thermal insulation shall be non-corrosive to the metal, water repellant, fire retardant, and non-sustenance to vermin and easily cut and fitted to shape during application.

6.1.3.1. The insulation shall be provided with an approved fire-retardant vapor barrier jacket to prevent moisture penetration to the insulation. Vapor barrier shall also be applied to all joints and edges.

6.1.3.2. The insulation shall be fixed onto the material surface by means of an approved adhesive compound that has no corrosive effect on the metal and thoroughly applied to the metal surface and insulation.

6.1.3.3. The insulation finishing shall be carried out by skilled labor, and before thermal insulation is applied, all metal surfaces shall be thoroughly cleaned and treated with an approved corrosion inhibitor.

6.1.3.4. Insulation shall be applied in such a manner that air circulation within the insulation or between the insulation and pipe, duct, or equipment is completely prevented.

Pipe insulation shall fit snugly on the pipe and duct insulation shall be adhered to the duct surface with special adhesive.

6.1.3.5. All insulation joints shall be firmly butted together, made absolutely tight and finished smooth. Vapor barrier jackets shall have 50 mm minimum overlaps. Longitudinal overlaps on exposed work shall be made towards ceiling or wall.

6.1.3.6. All insulation joints shall be made continuous through sleeves, openings and pipe hangers. The hanger shall be of size to fit around the insulation and jacketing.

6.1.3.7. Insulation shall be applied in such a manner as to permit expansion and contraction of the material without causing damage to the insulation or surface finish.

6.1.3.8. Openings made in the insulation shall be provided with metal frames to protect the edges of the insulation, and vapor sealed.

6.1.4 Ducting System and Accessories:

The Contractor shall procure and supply new ducting as indicated in this SOW. the ductwork shall comply with the following requirements:

6.1.4.1. Duct Mounted Smoke Detectors. The Contractor shall procure and supply a standalone duct mounted smoke detector system. The works shall include but not be limited to the following:

6.1.4.1.1. Procure and supply of standalone duct mounted smoke detectors in both the main supply and return air ducting.

6.1.4.1.2. The system shall be a standalone and as such will have its own horn and strobe, conduits, wiring and all accessories required to make the system fully operational.

6.1.4.1.3. Provision shall be made to preserve the option for connecting all smoke detectors to the building fire alarm panel.

6.1.5 Duct fabrication and installation works:

All aspects of metal ductwork, including all fittings and components, shall comply with ASHRAE and SMACNA HVAC Duct Construction Standards unless otherwise specified.

6.1.5.1. Duct Elbows. Duct elbows shall be radius type with a centerline radius of 1.5 times the width or diameter of the duct where space permits. Otherwise, elbows having a minimum radius equal to the width or diameter of the duct or square elbows with factory fabricated turning vanes may be used.

6.1.5. 2. Ducting Material. All ducting shall be made of steel sheet to ASTM A525, lock forming quality, having zinc coating of (1.25 Oz. per square ft.) 275 g/sq. mtr. as minimum for both sides in conformance with ASTM A90 and of tensile strength in the range of 28-33 tons per square inch.

6.1.5. 3. Duct Insulation. Thermal insulation shall be made of fiberglass or equivalent material with reinforced aluminum foil external coating, factory applied with resin bonded internal layer to give flat and resilient surface. The insulation for all duct work exposed to outside and those in plant rooms shall be rigid slab type, and for the remaining duct work flexible blanket type shall be used. The density of the insulation shall be minimum 24 kg/cubic meter for flexible blanket type and 48 kg/cubic meter for rigid slab type and thickness shall be as below:

6.1.5.3.1. Supply air duct in non-airconditioned areas --- 50 mm

6.1.5. 3.2. Supply air duct in airconditioned areas --- 25 mm

6.1.5. 3.3. Return air duct in non-airconditioned areas --- 25 mm

6.1.5. 3.4. Return air duct in airconditioned areas --- 25 mm

6.1.5. 3.5. Fresh air duct in airconditioned areas --- 25 mm

6.1.5. 3.6. Supply and return air ducts exposed to outside ambient temp. --- 75 mm Insulation shall be secured to duct work with 50 mm x 50 mm G.I. sheet metal strips of 22 gauge fixed to corners and tightened with wire at 150 mm intervals. The strips may be suitably grooved to take the wire fasteners. Transverse duct connections such as pocket joints and flanges shall be additionally insulated with 100 mm wide, 25mm thick insulation and covered with 200 mm wide, 8 oz. canvass equally overlapped on either side and finally coated with 2 coats of approved paint. All duct work exposed to view shall be finished with 227 gm. Canvass finished with 2 coats of fire retardant and waterproof paint. All ducts exposed to weather shall be provided with 24 Gauge U.S aluminum cladding.

6.1.6 HVAC Duct and Air Diffusers Cleaning:

The Contractor shall perform cleaning of the existing ducting and air diffusers. The works shall include but not be limited to the following:

6.1.6.1. Site Preparation Works. The Contractor shall do all required preparation and coordination prior to cleaning the ducts and diffusers.

6.1.6.2. Use of Specialized Duct Cleaning Personnel and Equipment. The Contractor shall utilize the services of professionals specialized in the execution of duct cleaning services.

6.1.6.3. Photo and Video Documentation. The Contractor shall submit to the COR the photo and video documentation of the existing conditions of the ducting prior to and after duct cleaning. The photo and video documentation shall be prepared and submitted in a format that can be replayed using normal and non-proprietary software for play back and review. All the photo and video documentation shall be saved on readable CD’s and forwarded to the KO within the same day when the photos and video were taken. Duct cleaning shall not proceed without documenting the existing duct conditions.

6.1.7 HVAC Unit Base Support:

The Contractor shall modify, Procure and supply appropriate base stands to support and install the new AC units.

All AC units shall be mounted on appropriate vibration isolators supported by AC base support. The works shall include but not be limited to the following:

6.1.7.1. Determination of Using the Existing AC Unit Supports. The Contractor shall conduct field verification, inspection, and coordination of the existing support structure of the HVAC unit. The Contractor shall submit the inspection report to the KO noting down any issues and concerns relating to the capability of the existing structure to support the new AC unit and capability of the roof or structural members to support the load.

6.1.7.2. Existing Concrete Pedestals (as applicable). When it is determined, that using the existing concrete pedestals is acceptable, the Contractor shall make minor repairs to areas which will include concrete plaster spalling, paint flaking, flashing, compromised water proofing, uneven surface level, etc. The Contractor shall not modify or add to the existing concrete pedestals without prior approval from the KO. The Contractor shall closely coordinate with and demonstrate existing conditions and its proposed solutions to the Government by submitting a method statement and drawings on how the repair works are to be done for each concrete pedestal that requires repair.

6.1.7.3. Existing Elevated AC Unit Steel Stands (as applicable). When it is determined, that using the existing elevated steel stands is acceptable, the Contractor shall make minor repairs which will include repairs for concrete plaster spalling of the concrete footing, removal and repainting of steel structure, flaking, flashing, uneven leveling, etc. The Contractor shall submit a proposal as to how to modify the existing steel stand to match the new AC unit in each case in which the existing steel stand is suitable for use with the new AC unit. The Contractor shall not modify or add to the existing elevated steel stands without prior approval from the KO. The Contractor shall closely coordinate and demonstrate existing conditions and its proposed solutions to the Government by submitting a method statement and drawings on how the repair works are to be done for each steel stand that requires repair and/or modification.

6.1.7.4. Non-Elevated AC Unit Steel Base Stands. The Contractor shall Procure and supply a new steel stand to provide a full perimeter base support for the new AC unit. The Contractor shall take into consideration the load points and follow manufacturer’s recommendations to properly support each new AC unit.

6.1.7.4.1. Existing non-elevated steel stands, the Contractor shall remove and replace them with new steel base stands to match the support requirements of the new AC units.

6.1.7.4.2. AC units placed directly on concrete pedestals, the Contractor shall procure and supply a full perimeter steel base stands to match the support requirements of the new AC units to be placed directly on top of the existing concrete pedestals and properly leveled.

6.1.7.4.3. AC unit placed directly on the roof, the contractor shall Procure and supply a full perimeter base stand with a minimum clear height of 30 cm above finished floor level and match the support requirements of the new AC units.

6.2 Electrical Specifications:

6.2.1 Electrical (Power Supply) Works Related to New HVACs.

The Contractor shall provide all electrical (power supply) works as required to provide power to the HVAC unit and as specified in this scope. The works shall include but not be limited to the following:

6.2.1.1. Extent of Works. The electrical works shall include all works and materials which start from the new AC unit to its dedicated DB/Isolator (cables, cable tray, accessories and etc.).

6.2.1.2. Electrical (Power Supply) Works Included in this Scope. The Contractor shall Procure and supply a new isolator panel complete with all the electrical power cables and conduits to be dedicated for each of the AC units and connected accessories (i.e. duct mounted heaters, etc.). The installation shall include all works, material, and manpower to ensure that the electrical power for the AC units is safe, operational and code compliant.

6.2.1.3. Electrical (Power Supply) Works Included in this Scope. The Contractor shall Procure and supply a new power cables from HVAC DB or isolator to new MSBs with all required sleeves, trays, accessories and civil works in order to keep HVAC system in safe mode.

6.2.1.4. Site Verification, Investigation and Preparing of the Report. The Contractor shall conduct site verification and testing in to determine the present status of the electrical power dedicated to each AC unit.

6.2.1.5. All power cables armored cross linked polyethylene cables (CU/XLPE/SWA/PVC), branch DBs IP54 according to IEC 61439.

6.2.1.1 Electrical (Controls) Works Related to HVAC.

The Contractor shall include all electrical (Controls) works as required to make the HVAC unit fully functional and as specified in this scope. The works shall include but not be limited to the following:

6.2.1.1.1 Removal of the Existing Temperature Control System. The Contractor shall remove and replace the existing electrical temperature control system of each existing AC unit. This works shall include the room thermostat, wiring, conduits, etc.

6.2.1.1.2 Procure and supply of a new Temperature Control System. The Contractor shall Procure and supply a new and compatible electrical temperature control system which will include but not be limited to room thermostat controller where the sensing element is to be mounted inside the main return air duct (duct mounted sensor); wiring;

lockable / antitampering clear cover enclosure for the room thermostat controller; and all other items required to make the system safe, fully operational and code compliant.

6.2.1.1.3 Programmable Thermostat Procure and supply. The Contractor shall supply and install a programmable thermostat which shall have a combined cooling and heating programmable (full seven-days program capability with 2 occupied and 2 unoccupied heating and cooling periods per day) thermostat with large back light display (LCD) screen and screen lock. Separately programmable weekday and weekend schedules must be provided for, and the thermostat must display both room temperature and temperature setting. Built-in compressor protection. Set point range heating and cooling 60 deg. F to 90 deg. F. or wider range with differential of 2 deg. F. The thermostat must meet the Energy Star guidelines for energy efficiency.

6.2.2 Electrical Power Supply System (MSBs) at Individual Buildings.

The Contractor shall provide main switch boards (MSBs) mentioned at SOW, as required to provide electrical power to HVACs, other loads at specific buildings. The works shall include but not be limited to the following:

6.2.2.1 Kuwait Air Defense will coordinate switching of MSBs, outgoing breakers at MLTP panels before dismantling of MSBs.

6.2.2.2 Disconnect main incomer and outgoing cables, accessories at MSBs.

6.2.2.3 Dismantling of the existing MSBs at buildings mentioned in SOW.

6.2.2.4 Provide new fourteen (14 NOS) MSBs between (cellular fixed or cabinet) types, floor stand with main incomer (MCCB) and outgoing TP MCCBs and SP breakers as per requirements.

6.2.2.5 All MSBs should be support by CTs at main busbar.

6.2.2.6 MSBs shall provide with TMD MCCBs.

6.2.2.7 MSBs shall provide with digital multimeter and indication lamps.

6.2.2.8 MSBs shall provide with ELR for critical outgoing loads like (HVAC, motors, etc.).

6.2.2.9 MSBs shall provide with spare outgoing MCCBs TP or SP according to site requirement.

6.2.2.10 MSBs shall provide with steel stand according to the dimensions of new panels.

6.2.2.11 Scope of work include all civil works required to implement new MSBs.

6.2.2.12 Termination of all power cables by checking its situation by continuity, short circuit and insulation tests.

6.2.2.13 All MSBs to be manufacture according to the specification and regulation of MEW and approved codes

IEC 61439.

6.2.2.14 Busbars, MCCBs, metering and all materials should be according to the specification and regulation of MEW and approved codes.

6.2.2.15 Cable glands, PVC pipes, GI pipes should be approved and to be according to the specification and regulation of US ARCENT and MEW.

6.2.2.16 Cable trays should be perforated type with return flag, hot dip galvanized after fabrication according to BS ISO 1461 with 1.5 mm thickness.

6.2.2.17 Enclosure of MSBs will be determine according to its location, for indoor MSB IP42, for outdoor MSB IP54 according to the specification and regulation of MEW.

6.2.2.18 Power cables will be exchanged between new MSB and new HVAC as mentioned in related electrical works for new HVACs.

6.2.2.19 Remaining, existing power cables to be terminated at new MSBs.

6.2.2.20 New power cables should be according to the specifications and regulation of MEW 600/1000V, copper armored cross liked polyethylene (4 core CU/XLPE/SWA/PVC), insulated applicable with Kuwait atmosphere.

6.2.2.17 Earthing system branches should be copper flat tape conductor 25*3mm bare tape with copper accessories for fixation.

6.2.2.18 Reserved

6.2.2.19 According to the capacity and full load ampere of each new HVAC unit new power cables between MSBs and new HVAC as per statement mentioned above.

- 4CX35 mm2 CU/XLPE/SWA/PVC

- 4CX50 mm2 CU/XLPE/SWA/PVC

- 4CX70 mm2 CU/XLPE/SWA/PVC

- 4CX95 mm2 CU/XLPE/SWA/PVC

7. Field Verification

Contractor is responsible for field verifying all existing conditions and dimensions prior to order placement. The

Contractor is responsible for reporting any issues to the KO.

7.1. The Contractor shall closely coordinate and submit to the KO all field verified information and generate scaled drawings reflecting the existing site conditions.

7.2. The Contractor’s field verifiable information shall include but not be limited to the following:

7.2.1. Existing HVAC units (including all existing installed accessories) which are to be removed and replaced.

7.2.2. Existing unit foundations and base stand supports.

7.2.3. Existing Ducting, Ducting Accessories and Cladding.

7.2.4. HVAC related electrical utilities including power and control

7.2.5. Interlocks with fire alarms or any existing control panels (as applicable)

7.2.6. Wall penetrations of the HVAC system

7.2.7 Existing main switch boards MSBs which are to be removed and replaced.

7.2.8. Provision for staging and storage areas

7.2.9. Disposal areas of debris and discarded HVAC equipment and accessories.

7.2.10. Electrical power supply suitability, condition and availability

7.2.11. Compatibility of the site to the new proposed AC units

7.2.12. Condition and suitability of the cables to be re-used for the installation of the AC units and its accessories

7.2.13. Access to and from the site.

7.2.14. All other relevant information as required in the proper execution of the works.

8. Testing

8.1. Mechanical Test.

The Contractor shall conduct and submit reports the following mechanical tests and other tests deemed necessary by the Government to be part of this scope. The Contractor shall be responsible for coordinating all aspects of testing.

The tests shall be performed by a specialist qualified and certified in the commissioning of HVAC systems or a manufacturer representative. Only calibrated instruments and instruments having valid certifications shall be used in testing. The works will include but not be limited to the following:

8.1.1. New AC Unit Testing and Commissioning.

8.1.2. Air Flow Performance Tests (Supply, Return, Fresh Air).

8.1.3. External Static Pressure Performance Tests.

8.1.4. Air Balancing at the Main Supply Air Duct, Return Air Duct and Fresh Air Intake.

8.2. Electrical Tests.

The Contractor shall conduct and submit reports for the following electrical tests as part of this scope. The

Contractor shall be responsible for coordinating all aspects of testing. The tests shall include:

8.2.1. Testing of the Existing electrical Systems for the AC unit.

8.2.2. Testing new power cables by

- Continuity test

- Insulation test

8.2.3 Testing new MSBs (incomer, outgoing) MCCBs and control devices.

9. Warranty

9.1 Contractor shall provide a five (5) year warranty on each…