AC Service
The Scope of this section sets out the requirements for the supply of all materials, labor and all necessary accessories for the proper and efficient maintenance of the Air Conditioning Plant and Ancillary Equipment for HVAC System.
All works to be performed under this specification shall be in accordance with manufacturers recommendations with the specification.
Workmanship and Materials
All works to be performed shall be carried out by workman skilled in the service maintenance and repair of Air Conditioning plant of all types and shall be executed in accordance with the best Commercial practice.
All materials used in connection with the work shall be new and unused and generally be original spares from the manufacturers.
Supervision
The repair and maintenance work shall be carried out under the supervision of a Foreman in charge of the servicing. The foreman shall be thoroughly competent and experienced in the supervising, maintenance and repair of Air Conditioning plant and accessories of all types and be in the direct employ of the Sub-Contractor and acceptable to the Client / Owner.
All workmen employed shall be skilled in the service, maintenance and repair of Air Conditioning Plant and accessories of all types and be in the direct employ of the Sub-Contractor.
Scope of Work
The Sub-Contractor shall inspect and service all Machinery and equipment comprising the complete Air Conditioning plant and accessories in accordance with the Schedule listed below.
The Sub-Contractor shall advise the Client / Owner of any defects in any part or parts of the complete Air Conditioning Plant and Accessories observed during the routine inspection and servicing and shall repair such defects at the Client / Owners approval.
The Sub-Contractor shall also provide emergency repair service during normal working hours and also outside normal working hours if required to do by the Client / Owners.
Servicing and Maintenance Schedule
The Sub-Contractor shall inspect and service all machinery and equipment comprising the Complete Air Conditioning Plant and accessories at least once a month, except where otherwise directed by the Owners / Client.
At each such monthly inspection and service of the complete Air Conditioning Plant and Accessories, the work detailed below shall be performed by the Sub-Contractor.
1. Compressors
Inspect all refrigerant compressors and refrigeration systems and check the following:
a) Check all seals and pipe lines for leaks and rectify as necessary.
b) Check all refrigerant and oil levels, and charge refrigerant and oil into refrigerant systems as necessary.
c) Check the tension of all belt drives and adjust as necessary.
d) Check the operation of all refrigerant controls, and clean, adjust and lubricate as necessary.
e) Check the operation of all safety devices, and clean, adjust and lubricate as necessary.
f) Check the suction and discharge pressures of all refrigerant compressors, and if abnormal trace the faults and rectify as necessary.
g) Check all bolts and nuts for tightness and tighten as necessary.
2. Pumps
Inspect all water pumps, and check the following:
i) Check all seals, glands and pipe lines for leaks, and rectify as necessary.
ii) Re-pack and adjust pump glands as necessary.
iii) Check all pump bearings and lubricate with oil or grease as necessary.
iv) Check the alignment and condition of all rubber couplings between pumps and drive motors, and rectify as necessary.
v) Check the tension of all belt drives, and adjust as necessary.
vi) Check all bolts and nuts for tightness, and tighten as necessary.
3. Air Handling Units
Inspect all air handling unit and / or water cooled packaged units and check the following:
i) Check all air filters, and clean as necessary.
ii) Check all water coils, seals and pipe lines for leaks, and rectify as necessary.
iii) Purge air from all water coils.
iv) Check all fan bearings, and lubricate with grease as necessary.
v) Check the tension of all belt drive and adjust as necessary.
vi) Check the operation of all automatic water regulating valves, and clean, adjust and lubricate as necessary.
vii) Clean all the condensate pans, trays and drains.
4. Cooling Towers
Inspect all water cooling towers, and check the following:
i) Check all fan bearings, and lubricate with grease as necessary.
ii) Check the tension of all belt drives, and adjust as necessary.
iii) Clean all water screens.
iv) Check the operation of all spray nozzles, and clean as necessary.
v) Drain, clean and flush out the water tanks of the Cooling towers when found necessary.
5. Electrical Motors
Inspect all electric motors, and check the following:
i) Check all motor bearings and lubricate with grease as necessary.
ii) Check carbon brushes and slip rings of all motors, and clean as necessary. Renew carbon brushes as necessary.
iii) Check safety devices fitted to all motors, and clean, adjust and lubricate as necessary.
6. Accessories
i) Check, adjust and lubricate all bearings, pivots and other moving parts as necessary.
ii) Clean or renew electric contactors as necessary.
iii) Renew electric fuses as necessary.
7. Inspect and check the routine operation of all automatic temperature controls and relays
i) Clean adjust and lubricate all bearings, pivots and other moving parts as necessary.
ii) Renew electric fuses as necessary.
8. Check the performance of the complete Air Conditioning Plant, and adjust air volume control dampers as necessary.
9. Instruct the operators responsible for the operation of the plant and equipment on correct method of operating the plant and equipment, and on the maintenance points to be watched.
10. Report in writing to the Client / Owner any defect (s) observed in any part or parts of the complete air conditioning plant and accessories. The report shall state the cause (s) of the defect (s) observed and shall include an estimate of the cost of repairs required.
Consumable Materials
The Sub-Contractor shall supply the following consumable materials as and when required:
a) All oils and greases required for lubrication of compressors, fan bearings, motor bearings, pivots and other moving parts.
b) All refrigerant required to replace refrigerant losses in the refrigerant system.
c) All consumable filter elements.
d) All carbon brushes required to replace worn bushes in electric motors.
e) All electric contact points required to replace worn electric contact points in switch gears, motor starter gears, electric control gears and electric relays.
f) All cotton waste, soap detergent and other cleaning materials required for cleaning purposes.
g) Fan belts for Air Handling Units, Compressors etc.
The costs of these consumable materials shall not be charged for separately by the Sub-Contractor, but shall be included in the fixed monthly quoted by the Sub-Contractor for the service and maintenance of the complete Air Conditioning Plant and Accessories.
Repairs
The Sub-Contractor shall repair defects in the complete Air Conditioning Plant and Accessories on the instructions of the Owner / Client.
The costs of such repairs shall not be included in the fixed monthly rate quoted by the Sub-Contractor for the service and maintenance of the completely Air Conditioning Plant and Accessories but shall be charged for separately by the Sub-Contractor.
All repairs on the complete Air Conditioning Plant and accessories shall be guaranteed by the Sub-Contractor against defects in workmanship and materials for a period of one year to take effect from date of completion of the repairs. During the guarantee period, the Sub-Contractor shall rectify defects in repairs carried out by him with no additional charge to the Client / Owner.
Service and Maintenance Records
The Sub-Contractor shall provide a service and maintenance record book for the complete Air Conditioning Plant and accessories being serviced and maintained, and brief details of all service, maintenance and repairs carried out on shall be entered by the Sub-Contractor into this book for checking purposes. The address and telephone number of the Sub-Contractor's service station shall also be entered into the record book to facilitate emergency service calls.
The Sub-Contractor shall also keep an accurate detailed record in duplicate of all service, maintenance and repair work carried out by him on the complete Air Conditioning Plant and accessories. This record shall be in the form of a Maintenance / Repair sheet, and shall be countersigned by the Owner / Client each time the Air Conditioning Plant and accessories is attended to the Sub-Contractor.
Rates for Service and Maintenance
The rates for the service and maintenance of the complete Air Conditioning plant and accessories shall be as shown in the Appendix to Form of Tender.
These rates shall be quoted for by the Sub-Contractor the time he submits his tender, and shall hold good for the period of three years commencing from the end of the free maintenance period. The Sub-Contractor may be required to enter into a Contract for the above period with Client / Owner.