Control Modules

Turn controller power off before servicing controls. This ensures safety and prevents damage to controller.

PROCESSOR MODULE (PSIO). 4 IN/4 OUT MODULE (SIO), LOW-VOLTAGE TiELAY’MODULE (DSIO), AND EXV DRIVER MODULE (DSIO) - The PSIO, DSIO and SIO modules all perform continuous diagnostic evaluations of the condition of the hardware. Proper operation of these modules is indicated by LEDs (light emitting diodes) on the front surface of the DSIOs, and on the top horizontal sur- face of the PSI0 and SIO.

RED LED - Blinking continuously at a 3- to 5-second rate indicates proper operation. Lighted continuously indicates a problem requiring replacement of module. Off continu- ously indicates power should be checked. If there is no in- put power, check fuses. If fuse is bad, check for shorted secondary of transformer or for bad module. On the PSI0 module, if the light is blinking at a rate of twice per sec- ond, the module should be replaced.

GREEN LED - On a PSI0 and an SIO, this is the green LED closest to COMM connectors. The other green LED on module indicates external communications, when used. Green LED should always be blinking when power is on. It indicates modules are communicating properly. If green LED is not blinking, check red LED. If red LED is normal, check module address switches. See Fig. 18, Proper addresses are:

PSI0 (Processor Module) - 01 (different when CCN connected)

DSIO (Relay Module) - 19

DSIO (EXV Driver Module) - 31

SIO (4 In/4 Out Module) - 59

If all modules indicate communication failure, check COMM plug on PSI0 module for proper seating. If a good connec- tion is assured and condition persists, replace PSI0 module.

If only DSIO or SIO module indicates communication failure, check COMM plug on that mode for proper seat- ing. If a good connection is assured and condition persists, replace DSIO or SIO module.

All system operating intelligence rests in PSI0 module , the module that controls unit. This module monitors con- ditions through input and output ports and through DSIO modules (low-voltage relay module and EXV driver module).

The machine operator communicates with microproces- sor through keypad and display module. Communication between PSI0 and other modules is accomplished by a 3-wire sensor bus. These 3 wires run in parallel from module to module.

On sensor bus terminal strips, terminal 1 of PSI0 mod- ule is connected to terminal 1 of each of the other modules. Terminals 2 and 3 are connected in the same manner. See Fig, 19, If a terminal 2 wire is connected to terminal 1, sys- tem does not work.

In FlotronicTM II Chillers, processor module, low-voltage relay module, and keypad and display module are all pow- ered from a common 21-vat power source which connects to terminals 1 and 2 of power input strip on each module. A separate source of 21-vat power is used to power options module through terminals 1 and 2 on power input strip. A separate source of 12.5 vat power is used to power EXV driver module through terminals 1 and 2 on power input strip .

PSIO, SIO

ADDRESS

SELECTOR

Fig. 18 - Module Address

Selector Switch Locations

64

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Carrier 040-420 specifications Control Modules, PSIO, SIO Address Selector
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040-420 specifications

The Carrier 040-420 is a highly regarded commercial HVAC unit specifically designed for efficient heating and cooling in medium- to large-sized buildings. Known for its reliability and advanced technology, this system is ideal for a variety of applications ranging from offices to industrial spaces.

One of the main features of the Carrier 040-420 is its energy efficiency. The unit utilizes advanced compressors and a high-efficiency heat exchanger, which work together to minimize energy consumption while maximizing performance. This is crucial in today’s energy-conscious environment, as businesses strive to reduce operational costs and their carbon footprint. The unit also boasts a high SEER (Seasonal Energy Efficiency Ratio) rating, making it an attractive option for those looking to lower their utility bills.

Equipped with advanced inverter-driven technology, the Carrier 040-420 allows for precise control of indoor climate conditions. This means that the system can adjust its output according to the actual cooling or heating demand of the space, resulting in enhanced comfort and reduced energy waste. The inverter technology also contributes to quieter operation, allowing for a more pleasant indoor environment.

Another feature that sets the Carrier 040-420 apart is its smart controls. The unit can be integrated with Carrier’s Building Automation Systems, enabling remote monitoring and management. This allows facility managers to optimize energy use and immediately respond to any performance issues. Additionally, the unit is compatible with various control interfaces, making it easy for users to adjust settings or schedule operations according to the building's occupancy patterns.

The robust design of the Carrier 040-420 ensures longevity and durability, even in harsh environmental conditions. Its weatherproof casing protects the internal components, enhancing the unit's performance and reliability over time. Maintenance is simplified with accessible design features, allowing technicians to conduct service checks and repairs without extensive downtime.

Overall, the Carrier 040-420 stands out as a modern HVAC solution that combines energy efficiency, advanced technologies, and user-friendly features. Its commitment to performance and sustainability makes it an ideal choice for businesses looking to enhance comfort while being mindful of their energy consumption. With its blend of innovation and reliability, the Carrier 040-420 continues to be a preferred option in the commercial HVAC market.
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