Table 27 -- Cooling Service Analysis

 

PROBLEM

 

 

 

 

 

 

 

 

 

 

CAUSE

 

 

 

 

 

 

 

 

REMEDY

 

 

 

 

Compressor

and

 

 

Power failure.

 

 

 

 

 

 

 

 

 

Call power

company.

 

 

 

 

 

 

 

Condenser

Fan

 

 

Fuse

blown

or circuit

breaker

tripped.

 

Replace

fuse or reset circuit

breaker.

 

 

 

 

Will Not

Start.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective

thermostat,

contactor, transformer, or control

Replace

component.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

relay.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Insufficient

line voltage.

 

 

 

 

 

Determine

cause

and correct.

 

 

 

 

 

 

 

 

 

 

 

Incorrect

or faulty wiring.

 

 

 

 

Check

wiring diagram

and rewire correctly.

 

 

 

 

 

 

 

 

Thermostat

setting

too high.

 

 

 

Lower

thermostat

setting below room

temperature.

 

 

 

 

 

 

Three

phase

power

incorrectly

connected (sizes 016 and

Correct

field power

phasing.

 

 

 

 

 

 

 

 

 

 

 

 

020 only). Indicated by flashing red LED on Phase Moni-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tor Relay (PMR) board (see Control Box Component

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Arrangement

for location).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor

Will

Not

Faulty

wiring

or

loose

connections

in compressor

circuit.

Check wiring and repair or replace.

 

 

 

 

Start

but

Condenser

Fan

Compressor

 

motor burned

out, seized, or internal

over-

Determine

cause. Replace

compressor.

 

 

 

Runs.

 

 

 

 

 

load open.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective

overload.

 

 

 

 

 

 

 

Determine

cause

and replace.

 

 

 

 

 

 

 

 

 

 

Compressor

 

locked

out

 

 

 

 

 

Determine

cause

for safety trip and reset lockout.

 

 

 

 

 

 

One leg of 3-phase

power

dead.

 

 

Replace

fuse or reset circuit

breaker.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Determine

cause.

 

 

 

 

 

 

 

 

Compressor

Cycles

 

Refrigerant

overcharge

or undercharge.

 

Recover

refrigerant,

evacuate

system,

and

recharge

(other

than

normally

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to nameplate.

 

 

 

 

 

 

 

 

 

satisfying

 

thermostat).

Defective

compressor.

 

 

 

 

 

 

Replace

and determine

cause.

 

 

 

 

 

 

 

 

 

 

Insufficient

line voltage.

 

 

 

 

 

Determine

cause

and correct.

 

 

 

 

 

 

 

 

 

 

 

Blocked condenser.

 

 

 

 

 

 

 

Determine

cause

and correct.

 

 

 

 

 

 

 

 

 

 

 

Defective

overload.

 

 

 

 

 

 

 

Determine

cause

and replace.

 

 

 

 

 

 

 

 

 

 

Defective

thermostat.

 

 

 

 

 

 

Replace thermostat.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Faulty

condenser-fan

 

motor.

 

 

 

Replace.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Restriction

 

in

refrigerant

system.

 

 

Locate

restriction

and

remove.

 

 

 

 

Compressor

Operates

Dirty

air filter.

 

 

 

 

 

 

 

 

 

Replace

filter.

 

 

 

 

 

 

 

 

 

continuously.

 

 

Unit undersized

for

load.

 

 

 

 

Decrease

 

load or increase

unit size.

 

 

 

 

 

 

 

 

 

 

Thermostat

set too low.

 

 

 

 

 

Reset

thermostat.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low refrigerant

charge.

 

 

 

 

 

Locate

leak, repair,

and recharge.

 

 

 

 

 

 

 

 

 

 

Air in system.

 

 

 

 

 

 

 

 

 

Recover

refrigerant,

evacuate

system,

and

recharge.

 

 

 

 

 

 

Condenser

coil

dirty

or

restricted.

 

 

Clean coil or remove restriction.

 

 

 

 

Excessive

 

Head

 

 

Dirty

air filter.

 

 

 

 

 

 

 

 

 

Replace

filter.

 

 

 

 

 

 

 

 

 

Pressure.

 

 

 

 

Dirty

condenser

coil.

 

 

 

 

 

 

Clean

coil.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refrigerant

overcharged.

 

 

 

 

 

Recover

excess

refrigerant.

 

 

 

 

 

 

 

 

 

 

 

 

Faulty

TXV.

 

 

 

 

 

 

 

 

 

 

1. Check

TXV bulb

mounting

and secure

tightly

to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

suction

 

line.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. Replace TXV if stuck open or closed.

 

 

 

 

 

 

 

 

 

Air in system.

 

 

 

 

 

 

 

 

 

Recover

refrigerant,

evacuate

system,

and

recharge.

 

 

 

 

 

 

Condenser

air restricted

or air short-cycling.

 

Determine

cause

and correct.

 

 

 

 

 

Head

Pressure Too

Low.

Low refrigerant

charge.

 

 

 

 

 

Check for leaks, repair, and recharge.

 

 

 

 

 

 

 

 

 

 

Restriction

 

in

liquid

tube.

 

 

 

 

Remove

restriction.

 

 

 

 

 

 

 

 

Excessive

 

Suction

 

 

High

heat

load.

 

 

 

 

 

 

 

 

Check

for source

and eliminate.

 

 

 

 

Pressure.

 

 

 

 

Faulty

TXV.

 

 

 

 

 

 

 

 

 

 

1. Check

TXV bulb

mounting

and secure

tightly

to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

suction

 

line.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. Replace TXV if stuck open or closed.

 

 

 

 

 

 

 

 

 

Refrigerant

overcharged.

 

 

 

 

 

Recover

excess

refrigerant.

 

 

 

 

 

 

Suction

Pressure

Too

Dirty

air filter.

 

 

 

 

 

 

 

 

 

Replace

filter.

 

 

 

 

 

 

 

 

 

Low.

 

 

 

 

 

Low refrigerant

charge.

 

 

 

 

 

Check for leaks, repair, and recharge.

 

 

 

 

 

 

 

 

 

 

Metering

device

or low side restricted.

 

Remove

source

of restriction.

 

 

 

 

 

 

 

 

 

 

 

Faulty

TXV.

 

 

 

 

 

 

 

 

 

 

1. Check

TXV bulb

mounting

and secure

tightly

to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

suction

 

line.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. Replace TXV if stuck open or closed.

 

 

 

 

 

 

 

 

 

Insufficient

evaporator

airflow.

 

 

 

Increase

air quantity. Check

filter and

replace if

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Temperature

 

too low in conditioned

area.

 

Reset

thermostat.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Field-installed

filter

drier

restricted,

 

 

Replace.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LEGEND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TXV -- Thermostatic Expansion Valve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

49

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Image 49
Carrier 48TJ016-028 specifications Cooling Service Analysis, Cause Remedy, Will Not, Than Normally
Page 48 Page 50

48TJ016-028 specifications

The Carrier 48TJ016-028 is a notable model in the range of packaged rooftop units designed by Carrier, a leader in heating, ventilation, and air conditioning (HVAC) solutions. Tailored specifically for commercial applications, these units provide a blend of efficiency, durability, and reliability, making them suitable for a variety of settings, including offices, retail spaces, and industrial environments.

One of the standout features of the 48TJ series is its energy-efficient performance. Equipped with high-efficiency scroll compressors, these units offer superior cooling capacity while minimizing energy consumption. This aligns with modern sustainability goals, helping businesses reduce their carbon footprint and operational costs. Additionally, the 48TJ units comply with stringent industry standards, such as the ASHRAE 90.1 energy efficiency guidelines, ensuring that users receive a product that meets modern energy performance benchmarks.

The 48TJ016-028 units also include advanced technologies that enhance performance and user comfort. The inclusion of a sophisticated microprocessor control system facilitates precise temperature regulation, allowing for an optimal balance of cooling and heating based on real-time conditions. Moreover, the user-friendly controls make it easy for facility managers to monitor system performance and make adjustments as necessary.

Another notable characteristic of the 48TJ series is its flexible installation options. These rooftop units are designed for easy integration into existing building structures and can be installed on flat or pitched roofs. Their compact design and lightweight construction simplify the installation process while minimizing structural impacts on buildings.

Durability is paramount in the design of the 48TJ units as well. The cabinets are constructed from high-quality materials with corrosion-resistant coatings, ensuring a long lifespan even in harsh environmental conditions. The systems are also equipped with robust insulation to reduce sound levels and improve overall operating efficiency.

Furthermore, the Carrier 48TJ016-028 units offer various options for customization. Users can choose from different airflow configurations, heating options, and accessories, allowing for tailored solutions that meet specific requirements. Whether you are looking for a unit with enhanced filtration, economizer capabilities, or advanced humidity control, the 48TJ series provides the flexibility needed for diverse applications.

In summary, the Carrier 48TJ016-028 units deliver a compelling combination of energy efficiency, advanced technology, and robust construction, making them an ideal choice for commercial HVAC needs. With their versatile features and customizable options, they stand out as reliable solutions for maintaining comfortable indoor environments.
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