Carrier G Series Heating Service Manual download pdf (Page 14)

1-6

T -310

1.3 System Operating Controls And

Components

There are five controls on the driver’s station which

affect the operation of the Carrier supplied equipment

covered by this manual. These controls include two

rocker switches, two slide switches, and the Micromate

Control Panel. (Figure 1-6)

The first rocker switch (1 Figure 1-6) is the drivers

On/Off/Defrost switch which controls the power to the

control circuit for the entire system. The first slide

switch (2) is labeled the Defrost Switch. This switch

controls the driver evaporator blower motor speed. The

second slide switch (3) is labeled the Heat Switch. This

switchcontrolsthedriverevaporatorcoolantvalve. The

second rocker switch (4) is labeled the Parcel Rack.

This switch will activate the parcel rack evaporators if

the passenger evaporator is in operation.

The fifth control is the Micromate Control Panel

(Figure 1-7 or Figure 1-8) which operates the Carrier

Transicold Micromax microprocessor controller, logic

board (Figure 1-10), relay board (Figure 1-9), circuit

breakers and relays (Figure 1-11). The logic board

regulates the operational cycles of the system by

energizing or de--energizing components in response to

deviations in interior temperature. Modes of operation

include Auto, Cool, Heat and Vent.

The Micromate Control Panel (supplied in one of two

configurations) is installed in the upper l eft hand switch

panel. One configuration (Figure 1-7) will allow the

driver to turn the system on and off, access outside and

interior return air temperatures, and adjust interior

temperature setpoint. With this configuration, system

diagnostics will need to be performed with the

Micromate Diagnostic Service Tool (P/N

76-62124--01). The other configuration (Figure 1-8)

will perform the same functions and also allow the

driver to control all the system functions manually. In

addition this configuration will allow the service

technician to view system parameters and alarms.

With the Micromatein the AUTO mode, the logic board

will cycle the system between the operating modes as

required to maintain desired set point temperature.

In the VENT mode the evaporator fans are operated to

circulate air in the bus interior.

In the HEAT mode the heat valve(EHV), the OEM

supplied boost pump and auxiliary heater are energized.

The evaporator fans operate to circulate air over the

evaporator coil in the same manner as the vent mode.

In the COOL mode the compressor is energized while

the evaporator and condenser fans are operated to

provide refrigeration as required. The compressor is

fitted with cylinder unloaders to match compressor

capacity to the bus requirements. Once interior

temperature reaches the desired set point, the system

mayoperateineither the clutch cycleor reheat mode(set

at the factory, choosen as part of the purchase

agreement). A controller programmed for reheat will

maintain compressor operation and open the heat

valve(EHV) to allow reheating of the return air. In the

reheat mode interior temperature i s m aintained at the

desired set point while additional dehumidification

takes place. A controller programmed for clutch cycle

will de--energize the compressor clutch and allow t he

system to operate in the vent mode until further cooling

is required.

1.3.1 Other Carrier Supplied Items

Other Carrier supplied items include driver and

passenger interior return air temperaturesensors, andan

ambient temperature sensor. The temperature sensors

provide input to the controller on temperature

conditions in the applicable zone.

1. System On/Off/Defrost

2. Defrost(Driver’s Evap. Blower)

3. Heat(Driver’s Evap. Coolant Valve)

4. Parcel Rack On/Off

5. Micromate Control Panel

Figure 1-6. System Operating Controls

(upper left hand switch panel)

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Carrier G Series Heating Service Manual Page 14

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