Code Alarm SRT 5500 Specifications download pdf (Page 66)

December 2013

REQUEST FOR PROPOSALS FOR

PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES

RFP SRTA-2014-01

TECHNICAL SPECIFICATIONS

PAGE-66

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a. The coach shall be equipped with a Thermo King Model T Series Coach Air Conditioning

System with X426 Compressor and Clutch Assembly, o r approved equal,

designed to operate on 407C refrigerant. The T Series upper package mounts in a

compartment in the rear area of the coach above the coach engine. The

compressor/clutch assembly mounts in the engine compartment, and is belt driven from

either the engine or transmission. If an alternator is also driven from the same PTO,

then the compressor and alternator shall be driven by a single serpentine design belt.

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b. The air conditioning unit frame shall be constructed of 5052-H32 structural aluminum of

.100 and .182 material thickness for strength, corrosion protection, and light weight. The

frame shall be all welded and painted with a high solid polyester paint. All hardware shall

be 300 Series stainless steel to protect against corrosion. "Neverseez" anti-seizing

lubricant shall be applied to the threads of all stainless steel hardware during unit

assembly to prevent thread galling.

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c. The evaporator, heater and condenser coils shall be constructed of 3/8 inch outside

diameter seamless Series 122 copper tubing having minimum .0195 inch wall thickness.

The copper tubing shall be mechanically expanded into aluminum fins having a minimum

thickness of .080 inch. The fin spacing shall be: evaporator and heater coils - 12 fins per

inch; condenser coil - 10 fins per inch. The condenser coil shall be dipped in an acrylic

base, polyvinyl material to provide a 2 mil thick coating of the entire exterior surface for

corrosion protection and quick dirt release during washing. This coating shall not impair

the performance of the air conditioning system. The condenser coil shall be mounted to

allow easy removal and reinstallation without major disassembly of the unit frame or

removal of the unit from the coach. Separate drains shall be provided for the condenser

and evaporator/heater sections to allow moisture to be routed out of the unit to the street.

Drain seals and/or traps shall be installed at the outlet of the evaporator/heater drain

tubes to prevent entrance of dirt or fumes into the coach.

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d. The motors shall be wound magnet 27VDC, GE. The condenser shall have two motors;

the evaporator/heater shall have one. Motors shall be selected and applied to maximize

efficient operation, airflow and long life. Brush life shall be minimum of 10,000 hours of

operating time. Motors shall be capable of two speed operation. Evaporator/heater motor

shall operate at low speed during heat mode and high speed during cool, vent or reheat

modes. Condenser fans shall be axial flow type with a steel spider, aluminum blades and

aluminum hub. The fans shall be coated with high solid polyester paint for corrosion

protection.

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e. Evaporator/heater blowers shall be 9" x 5", forward curve, single inlet centrifugal type.

Regreasable, self-aligning outboard bearings shall support the blower shafts. Heavy

duty, ring type flexible couplings shall connect the shafts to the motor.

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22.8 Temperature and Electrical Controls

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a. There shall be a unitized control panel consisting of reliable electromechanical relays,

magnetic motor circuit breakers, bi-metal control circuit breakers, adjustable return air

thermostat with a range of 60

- 90

F, ambient thermostat, evaporator coil anti-freeze

thermostat and terminal board for ease of troubleshooting.

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b. This control panel shall be located in the evaporator/heater return air area, or in an

enclosed control box if mounted in an ambient location. The return air thermostat shall

have a maximum tolerance from set point of 2.5

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