Carrier 50TFQ004 - User Manual

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Single-package standard efficiency

rooftop heat pumps with:

• State-of-the-art defrost system

• Dependable 4-way valve operation

• Refrigerant filter strainer and

accumulator

• Field-installed electric heaters

available

• Advanced hermetic compressors

mounted on vibration isolators

• Factory-installed Apollo communi-

cating controls, non-fused discon-

nect switch, and convenience

outlet available

Features/Benefits

The 50TFQ standard

efficiency rooftop product

line combines advanced

technology with

serviceability, performance,

and flexibility

State-of-the-art defrost system

uses time and temperature to keep the

outdoor coil frost-free for economical,

dependable operation.

Dependable 4-way valve opera-

tion safely and efficiently accom-

plishes cycle reversals, defrost, and

normal operation.

Refrigerant filter strainer and ac-

cumulator ensure performance

dependability and circuit protection.

Field-installed electric heaters

available in a wide range of capaci-

ties. Single-point wiring kit makes

installation simple.

NOTE: Some electric heater applica-

tions not available for use with

factory-installed disconnect switch.

50TFQ004-012

Single-Package

Standard Efficiency

Rooftop Heat Pump Units

3 to 10 Nominal Tons

Product

Data

50TFQ004-007

50TFQ008-012

Main Page

Other manuals for Carrier 50TFQ004

Installation, Start-Up And Service Instructions56 pages

Questions and Answers

G
Gregory ColemanJul 30, 2025
Why won't the compressor start on my Carrier Heat Pump, but the outdoor fan is running?
- B
  bholmesJul 30, 2025
  If the compressor of your Carrier Heat Pump won't start but the outdoor fan runs, begin by checking the wiring and connections in the compressor circuit for faults or looseness; repair or replace as necessary. The compressor motor may be burned out, seized, or have an open internal overload, requiring compressor replacement after determining the cause. Defective run/start capacitors, overloads, or start relays can also prevent the compressor from starting, so determine the cause and replace the faulty component. Lastly, check if one leg of the 3-phase power is dead; if so, replace the fuse or reset the circuit breaker and determine the underlying cause.
D
David HollowayNov 13, 2025
What to do if the compressor and outdoor fan of my Carrier Heat Pump will not start?
- Y
  yburtonNov 13, 2025
  If the compressor and outdoor fan of your Carrier Heat Pump won't start, it could be due to several reasons. First, check for a power failure and call the power company. A blown fuse or tripped circuit breaker could also be the culprit, so replace the fuse or reset the circuit breaker. Other potential causes include a defective thermostat, contactor, transformer, control relay, or capacitor, which would need replacement. Also, check for insufficient line voltage and correct it. Inspect the wiring for any issues, referring to the wiring diagram for correct rewiring. Ensure the thermostat setting isn't too high; lower it below room temperature. Finally, issues like a tripped high or low pressure switch, or a tripped freeze-up protection thermostat, could be the cause. For these, refer to the...