Specifications

December 2013
REQUEST FOR PROPOSALS FOR
PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES
RFP SRTA-2014-01
TECHNICAL SPECIFICATIONS
PAGE-65
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g. Main heater shall be mounted in the rear of the coach above the engine compartment. It
shall be a hot water type with heavy-duty motors and a minimum capacity of 110,000
B.T.U. at 100-degree water-air temperature differential. A water shut-off valve shall be
provided at the heater.
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22.2 Driver's Heater
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a. A separate dash heater and blower shall be provided for the driver's comfort and for
windshield defrosting. Capacity of 40,000 BTU output at 100-degree water-air
temperature differential, is required.
b. A two-speed blower, using a 24V, electric motor, shall be provided with air volume of 500
cfm minimum with separate switch and manual valve to control air flow.
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c. Defroster blower shall be automatically inoperative if the alternator is not charging.
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d. A 12V 5-blade defroster fan, with fan guard, shall be located in the lower left corner of the
windshield area of the coach. Switch shall be mounted on the driver's console. SRTA to
approve the location.
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22.3 Heater Water Lines
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a. Heater water lines shall not be exposed within the coach.
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b. All water lines shall be heavily insulated throughout the coach. They shall be made of
heavy-duty copper or brass, except where shock absorbing or flex lines are required.
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22.4 Heater Cores
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a. All heater cores fins shall be of aluminum, and the heater core tubes shall be copper.
Metal used in the tanks shall be of adequate thickness with drawn reinforcements. All
radii of the tanks shall be of sufficient size to preclude fatigue failure.
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b. Heater cores, motor and fan must be readily accessible and installed to permit ready
removal.
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22.5 Heater and Blower Motors
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a. All blowers required for the heating and ventilating system shall be balanced statically
and dynamically.
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b. All motors required for these blowers shall be heavy-duty type, motors three-eighth (3/8)
horsepower minimum.
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22.6 Heater Gradustat and Water Pump
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Gradustat controlling the heating system shall be protected or screened to prevent tampering and
guarded against any possible damage from passenger's feet. Location to be approved by the
SRTA. Water supply to the heating system to be controlled by a modulating valve. The heater
circulating water pump must be an minimum capacity of fifteen (15) gallons per minute.
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22.7 Air Conditioning System