Possible causes of fault are low refrigerant charge, plugged filter drier, or a faulty EXV or thermistor.

Code 48 Low suction superheat, Circuit A Code 49 Low suction superheat, Circuit B

If EXV is at minimum position, suction superheat is less than 10” F (5.5” C) or saturated evaporator temperature is greater than MOP (maximum operating pressure) for more than 5 minutes, affected circuit shuts down after going through pumpout process, Reset is manual with LOCAL/ENABLE- STOP-CCN switch, and start-up follows normal sequence.

Possible causes of fault are faulty EXV or thermistor. Code 50 Illegal configuration

This fault indicates a configuration error. Unit is not al- lowed to start. Check all configuration data and set points and correct any errors.

Code 51 Initial configuration required

i2G7

This fault indicates factory configuration has not been done, and unit is not allowed to start. Refer to unit wiring label diagrams for factory configuration codes, There are 8 groups of S-digit numbers that must be entered. The first

4groups must be entered under s17ubafu n c t i o n . G r o u p s

7and 8 must be entered under MHs u b f u n c t i o n .

Enter each group, then press the H key. Use the

down arrow 0+ after each group to bring up the next

empty screen. Unit should start after factory and field con- figurations are correctly entered.

The usual cause of this fault is replacement of the pro- cessor module. Refer to instructions accompanying the re- placement module.

Code 52 Emergency stop by CCN command.

Unit goes through normal shutdown when this command is received, and goes through normal start-up when com- mand is cancelled.

S T A N D A R D : 040-060

50

H z

r - - - -

I - - - -

- -

040-070

60

H z

,

[CPCS

’ Sl

 

 

 

1 C R ’ S

 

 

 

 

 

 

 

LEGEND

S T A N D A R D :

070 50

Hz

 

 

 

Contactor

 

 

 

 

 

 

A C C E S S O R Y :

60

50

H z

&I

 

Circuit

Breaker

 

040-070

60

C O M M

 

Communications Bus

 

 

 

 

 

 

 

 

 

CPCS

 

Compressor Protection

 

 

 

 

 

 

Control

Module

 

 

 

 

CR

 

Compressor Contactor Relay

 

 

 

 

D G T

 

Discharge Gas Thermostat (Optional)

 

 

 

 

DSIO

 

Relay

Module (Low Voltage)

 

 

 

 

HPS

-

High-Pressure Switch

 

 

 

 

 

Low Vottage

 

 

 

 

K

 

Plug

 

 

 

 

 

PWR

 

Power

 

 

 

 

 

SNB

-

Snubber

 

 

 

 

TB

Terminal Block

 

 

 

 

TRAN

-

Transformer

 

 

 

 

U

-

Unloader

Fig. IOA - 24-V Safety Circuit Wiring (040-070)

52

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Image 52
Carrier 040-420 specifications ’ Sl, R ’ S
Page 51 Page 53

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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