Carrier Supra 650 Service Manual download pdf (Page 24)

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1.5 SYSTEM OPERATING CONTROLS AND

COMPONENTS

The unit is furnished with a microprocessor control

system. Once the set point is entered at the controller,

the unit will operate automatically to maintain the de-

sired temperature within very close limits. The control

system automatically selects high and low speed cool-

ing or high and low speed heating as necessary to main-

tain the desired temperature.

Units also have a auto start/stop feature. Auto start/stop

operation provides automatic cycling of the diesel en-

gine or standby motor, which in turn offers an energy

efficient alternative to continuous operation.

1.5.1 Switches And Controls

Manual control switches are located on the side of the

electrical box. Components required for monitoring and

controlling the diesel engine and refrigeration system

are located on the engine, compressor or system piping.

1. RUN/STOP Switch (RSS)

This switch controls the supply of power to the micropro-

cessor and cab command. The switch is placed in the

ON position to allow manual or automatic unit operation.

With the switch in the OFF position, the unit will be shut

down and neither manual or automatic starting is al-

lowed.

2. Manual Glow/Crank Switch (MGC) If Equipped

If the unit is equipped with a Manual Glow/Crank Switch,

it is a three--position switch. This switch is held in the

GLOW position to energize the glow plugs and pre-heat

the combustion chamber. The switch is moved to the

CRANK position to manually engage the engine starter.

When the switch is released, it returns to the middle

position to de-energize both components.

3. Oil Pressure Safety Switch (OP)

This switch will automatically stop the engine upon loss

of oil pressure. The switch is located on the side of the

engine.

4. Water Temperature Sensor (WTS)

The microprocessor will stop the unit when this sensor

signals a high water temperature condition. The sensor

is located on the engine cylinder head.

5. High Pressure Cutout Switch (HP1)

This switch will automatically stop the engine when

compressor discharge pressure exceeds the set point.

The switch is located on the compressor cylinder head.

6. High Pressure Switch (HP2) (850 Only)

This switch is used to unload the compressor in high

ambient conditions.

7. Compressor Discharge Temperature Sensor (CDT)

(except for 850)

The microprocessor will stop the unit when this sensor

signals a high discharge temperature condition. The

sensor is located on the compressor center head.

8. Compressor Suction Pressure Transducer (SPT)

The Compressor Suction Pressure Transducer signal is

used by the microprocessor in the compressor protec-

tion logic to protect the compressor under excessive

suction pressure conditions and under excessively low

suction pressure conditions. The sensor is located on

the compressor body for all units except 850. It is lo-

cated in the suction line for 850 units.

9. Ambient Temperature Sensor (ATS) (950 Only)

The Ambient Temperature Sensor signal is used by the

microprocessor in the compressor protection logic to

determine expected conditions. It is located between

the condenser and the front grille.

10. Temperature control sensors

Box temperature is controlled by one or two sensors:

SRAS: Measures return air to the evaporator

SSAS (optional): Measures supply air to the evapora-

tor and is also used in heat option kits as an overtem-

perature safety sensor.

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Comments to this Manuals

Hermes Hurtado 13 Mar 2025 | 11:43:58

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Carrier Supra 650 Service Manual Page 24

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