Code Alarm SRT 5500 Specifications download pdf (Page 20)

December 2013

REQUEST FOR PROPOSALS FOR

PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES

RFP SRTA-2014-01

TECHNICAL SPECIFICATIONS

PAGE-20

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No heat producing components or climate control system components shall be mounted between the

engine cooling air intake aperture and the radiator.

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The radiator and charge air cooler shall be designed to withstand thermal fatigue and vibration

associated with the installed configuration.

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12.2.1 Baseline: Standard Requirement for Coolant Filtration

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The engine cooling system shall be equipped with a properly sized water filter with a spin-on element

and an automatic system for releasing supplemental coolant additives as needed to replenish and

maintain protection properties.

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12.2.2 Baseline: Standard Requirement for Cooling Fan Operation

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The cooling fans shall be temperature controlled, allowing the engine to reach operating temperature

quickly. The temperature-controlled fans shall not be driven when the coolant temperature falls below

the minimum level recommended by the engine manufacturer. Electric fans should provide

independent control of the engine coolant and charge-air temperatures.

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12.3 Charge Air Cooling

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The charge air cooling system, also referred to as after-coolers or inter-coolers, shall provide

maximum air intake temperature reduction with minimal pressure loss. The charge air radiator shall

be sized and positioned to meet engine manufacturer's requirements. The charge air radiator shall

not be stacked ahead or behind the engine radiator and shall be positioned as close to the engine as

possible unless integrated with the radiator. Air ducting and fittings shall be protected against heat

sources, and shall be configured to minimize restrictions and maintain sealing integrity.

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12.3.1 Engine and Charge Air Cooler Cooling System - Electric

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The cooling systems shall be of sufficient size to maintain all engine and transmission fluids and

engine intake air at safe, continuous operating temperatures during the most severe operations

possible and in accordance with engine and transmission manufactures cooling system

requirements. The cooling system fan controls should independently sense the temperatures of

the operating fluids and intake air and if either is above safe operating conditions the cooling fans

should be engaged. The fan control system shall be designed with a fail safe mode of “fan on.”

The cooling system in new condition shall have an ambient capacity with vehicle at max. GVW of

at least 115ºF at Peak Power and 120ºF at Peak Torque using a 50-50 mix of ethylene

glycol/water at sea level operation. Vehicle might require the following recirculation control

features; vented curbside door, vented rear door and/or radiator skirt.

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12.4 Surge Tank Filler Neck and Cap

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a. The sealed cooling system shall be provided with self-unloading valve to prevent

extreme pressure from injuring cooling system.

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b. Heavy-duty copper, brass (stress relieved), or stainless steel radiator surge tank

shall be provided and mounted above the radiator and easily accessible for

service. Sight glass shall be provided to allow check of fluid level without opening

system. A low coolant sensor will be provided on the surge tank. Filler cap shall

be hinged type.

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Code Alarm SRT 5500 Specifications Page 20

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