48TC

 

Table 13 – Heating Service Analysis

 

 

 

PROBLEM

CAUSE

REMEDY

 

Misaligned spark electrodes.

Check flame ignition and sensor electrode positioning.

 

Adjust as needed.

 

 

 

 

 

 

 

Check gas line for air, purge as necessary. After purging

 

No gas at main burners.

gas line of air, allow gas to dissipate for at least 5 minutes

 

before attempting to relight unit.

 

 

 

 

 

 

 

Check gas valve.

 

 

 

Burners Will Not Ignite.

Water in gas line.

Drain water and install drip leg to trap water.

No power to furnace.

Check power supply, fuses, wiring, and circuit breaker.

 

 

No 24 v power supply to control

Check transformer. Transformers with internal overcurrent

 

circuit.

protection require a cool down period before resetting.

 

 

 

 

Miswired or loose connections.

Check all wiring and wire nut connections.

 

Burned---out heat anticipator in

Replace thermostat.

 

thermostat.

 

 

 

 

 

 

Broken thermostat wires.

Run continuity check. Replace wires, if necessary.

 

 

 

 

Dirty air filter.

Clean or replace filter as necessary.

 

Gas input to unit too low.

Check gas pressure at manifold. Clock gas meter for input.

 

If too low, increase manifold pressure, or replace with

 

 

correct orifices.

 

 

 

 

Unit undersized for application.

Replace with proper unit or add additional unit.

 

 

 

Inadequate Heating.

Restricted airflow.

Clean filter, replace filter, or remove any restrictions.

Blower speed too low.

Use high speed tap, increase fan speed, or install optional

 

 

blower, as suitable for individual units.

 

 

 

 

 

 

Limit switch cycles main burners.

Check rotation of blower, thermostat heat anticipator

 

settings, and temperature rise of unit. Adjust as needed.

 

 

 

 

 

 

Too much outdoor air.

Adjust minimum position.

 

 

 

Check economizer operation.

 

 

 

 

Check all screws around flue outlets and burner

 

Incomplete combustion (lack of

compartment. Tighten as necessary.

 

 

Poor Flame

Cracked heat exchanger.

combustion air) results in:

 

Overfired unit — reduce input, change orifices, or adjust

Characteristics.

Aldehyde odors, CO, sooting

gas line or manifold pressure.

 

flame, or floating flame.

 

 

 

Check vent for restriction. Clean as necessary.

 

 

 

 

 

 

 

Check orifice to burner alignment.

 

 

 

Burners Will Not Turn

Unit is locked into Heating mode

Wait until mandatory one---minute time period has elapsed

Off.

for a one minute minimum.

or reset power to unit.

 

 

 

32

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Carrier 48TCA04---A12 appendix Heating Service Analysis, Problem Cause Remedy
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48TCA04---A12 specifications

The Carrier 48TCA04---A12 is a high-efficiency rooftop air conditioning unit designed for commercial and industrial applications. Known for its reliability and performance, this model features advanced technologies that cater to diverse climate control needs.

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