The Contractor’s normal working hours will be 8am – 6 pm however he will be contactable in the case of emergencies to ensure that the system is operable during all times as required. For the avoidance of doubt periodic attendance by the Contractor means he may be present each and every day and for the full period of the working hours stated above, however, this shall not be normal practice, and attendance shall be at the Contractor’s discretion and will be based on operational requirements. In the event of pipe blockage or breakdown in any part of the system, the Contractor shall isolate, as far as practicable, only the parts concerned to allow the central plant to continue serving other parts of the system. The Contractor shall clear the problem within the reasonable period of time. Daily maintenance services including visual check of all rotating and translating (sliding) parts for any abnormal vibration or noise, applying lubricants if necessary, clearing fluid/debris/dust accumulation, replenishing oil/consumable items, replacing burnt fuses/luminaries, etc. Weekly maintenance services including general cleaning, check for any damage, detector or sensor location adjustment, cleaning of detectors or sensors, etc. shall be provided for, but not limited to, the following equipment –