Carrier Aquazone 50RHE 048 User Manual

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Carrier is participating in

the Eurovent Certification

Programme. Products are

as listed in the Eurovent

Directory of Certified

Products.

50RHE 006-060

Water-Source Heat Pumps -

Horizontal Units

Installation, Operation and Maintenance Instructions

TM

Table of Contents

Questions and Answers:

D
Dale FieldsAug 18, 2025
Why is my Carrier Aquazone 50RHE 048 insufficient capacity/not cooling or heating properly?
- J
  Joy SimonAug 18, 2025
  Several factors can cause insufficient capacity or improper cooling/heating in your Carrier Heat Pump. A dirty filter restricts airflow, so replace or clean it. Check for reduced airflow in heating or cooling, inspect fan motor operation, and address any airflow restrictions. High external static can also be a factor. Leaky ductwork can cause temperature differences between the unit and registers, indicating leaks. Low refrigerant charge or a restricted metering device can also be culprits. Other potential causes include a defective reversing valve, an improperly located thermostat, scaling in the water heat exchanger. Also recheck loads and sizing, loop sizing, loop backfill, ground moisture.
E
Edward WalkerAug 21, 2025
What to do if my Carrier Heat Pump has main power problems?
- E
  Earl HicksAug 21, 2025
  If your Carrier Heat Pump is experiencing main power problems, start by checking the line voltage circuit breaker and disconnect. Then, check for line voltage between L1 and L2 on the contactor. Also, verify that there is 24 V a.c. between R and C on the controller. Finally, check the primary/secondary voltage on the transformer.
M
Meghan YoungAug 23, 2025
What to do if my Carrier Aquazone 50RHE 048 shows HP fault - code 2 High pressure?
- P
  Paul ThomasAug 23, 2025
  If your Carrier Heat Pump displays a high-pressure fault (code 2), it could be due to several reasons. Check for reduced or no water flow in cooling by inspecting the pump or valve operation/setting and adjust water flow to the proper rate. If the water temperature is out of range in cooling, bring it within design parameters. For heating issues, check for reduced or no airflow by inspecting and cleaning or replacing the air filter. Also, check the fan motor operation and airflow restrictions. Dirty air coil or excessive external static pressure (check Table 4) can also cause this issue.
K
Kelli TrujilloAug 28, 2025
What to do if my Carrier Aquazone 50RHE 048 Heat Pump has LP/LOC fault - code 3 Low pressure/loss of charge?
- M
  melissa13Aug 28, 2025
  If your Carrier Heat Pump shows a low pressure/loss of charge fault (code 3), it may be caused by insufficient charge. Check for refrigerant leaks. Also, check the charge and start-up water flow.
N
nelsonedwinAug 30, 2025
What to do if my Carrier Heat Pump shows FP1 fault - code 4 Water freeze protection?
- K
  Kelsey FrederickAug 30, 2025
  If your Carrier Heat Pump displays a water freeze protection fault (FP1 - code 4), it could be due to several reasons. First, check for reduced or no water flow in heating by inspecting the pump or water valve operation/setting. Also, check if the strainer or filter is plugged and clean or replace it. Make sure to adjust water flow to the proper rate. If the anti-freeze level is inadequate, check the anti-freeze density with a hydrometer. For improper freeze protect settings, clip the JW2 jumper for anti-freeze (-12.2°C) use. If the water temperature is out of range, bring it within design parameters. Finally, a bad thermistor can cause this issue, so check the temperature and impedance correlation.
A
April OdomSep 1, 2025
What to do if my Carrier Aquazone 50RHE 048 shows FP2 fault - code 5 Air coil freeze protection?
- O
  owenszacharySep 1, 2025
  If your Carrier Heat Pump displays an air coil freeze protection fault (FP2 - code 5), it could be due to several factors. Check for reduced or no airflow in cooling by inspecting the air filter and cleaning or replacing it. Also, check the fan motor operation and airflow restrictions. High external static (check Table 4) can also cause this. If the air temperature is out of range, especially if there is too much cold vent air, bring the entering air temperature within design parameters. For improper freeze protect settings, note that normal airside applications will require -1.1°C only. Finally, a bad thermistor can cause this, so check the temperature and impedance correlation.
W
wscottSep 3, 2025
What to do if my Carrier Heat Pump has Condensate fault - code 6?
- J
  Janice WalkerSep 3, 2025
  If your Carrier Heat Pump is showing a condensate fault (code 6), there are several things you can check. A blocked drain can cause this, so check for blockage and clean the drain. An improper trap can also be the cause, so check the trap dimensions and location ahead of the vent. Poor drainage can lead to this issue, so check for piping slope away from the unit and the slope of the unit toward the outlet. Also, check vent location for poor venting. Lastly, check for moisture shorting to the air coil.
F
fcurrySep 6, 2025
What to do if my Carrier Heat Pump shows Over/under voltage - code 7?
- K
  Kristen ClarkSep 6, 2025
  If your Carrier Heat Pump displays an over/under voltage fault (code 7), which is auto-resetting, there are several things you can check. If there is an undervoltage, check the power supply and 24 V a.c. voltage before and during operation, as well as the power supply wire size and compressor starting. Also, check the 24 V a.c. and unit transformer tap for correct power supply voltage. If there is an overvoltage, check the power supply voltage and 24 V a.c. before and during operation, and also check the 24 V a.c. and unit transformer tap for correct power supply voltage.
S
Steven OsbornSep 8, 2025
Why does my Carrier Aquazone 50RHE 048 Heat Pump unit short cycles?
- M
  martincynthiaSep 8, 2025
  Several factors can cause short cycling in your Carrier Heat Pump. A dirty air filter restricts airflow, so check and clean it. If the unit is in ‘Test Mode’, reset power or wait 20 minutes for auto exit. The unit may be oversized for the space, so check sizing for the actual load of the space.
M
Marcia RasmussenSep 13, 2025
Why my Carrier Aquazone 50RHE 048 only fan runs?
- B
  Brandi ThomasSep 13, 2025
  If only the fan is running on your Carrier Heat Pump, there are a few things to investigate. First, ensure the thermostat is set for heating or cooling operation. The unit may be locked out, so check for lockout codes and reset power. Also, check the compressor overload and replace it if necessary. Finally, check the Y and W wiring at the heat pump. You can jumper Y and R for compressor operation in test mode.

Carrier Aquazone 50RHE 048 Specifications

General

Model Number	50RHE048
Category	Heat Pump
Cooling Capacity	48, 000 BTU/h
Energy Efficiency Ratio (EER)	11.0
Refrigerant	R-410A
Power Supply	208/230V, 1 phase, 60Hz

Summary

Safety Considerations

Installation

Check jobsite

Site preparation and inspection before unit installation.

Check unit

Piping connections

Electrical wiring

Instructions and precautions for making electrical connections to the unit.

Power connection

Low voltage wiring

Pre-Start-Up Procedures

System checkout

Checklist of essential checks before initial unit start-up.

Field Selectable Inputs

Complete C control jumper settings

Configuring freeze protection and alarm relay using jumpers.

Complete C control DIP switches

Setting performance monitor and stage 2 delay using DIP switches.

Deluxe D control jumper settings

Configuring freeze protection limits via jumpers for Deluxe D control.

Deluxe D control DIP switches

Configuring accessory relays, staging, and thermostat type via DIP switches.

Deluxe D control accessory relay configurations

Start-Up Procedures

Operating limits

Scroll compressor rotation

How to verify the compressor is rotating in the correct direction.

Unit start-up cooling mode

Unit start-up heating mode

Operation Modes

Power up mode

Units with Aquazone Complete C control

Operating modes for units with Complete C control.

Units with Aquazone Deluxe D control

Operating modes for units with Deluxe D control.

System Test and Diagnostics

Test mode

How to enter and use the unit's test mode for diagnostics.

Aquazone Deluxe D control LED indicators

Service and Maintenance

Filters

Refrigerant system

Procedures for servicing the refrigerant system, including charge checks.

Checking system charge

How to check the refrigerant system charge accurately.

Refrigerant charging

Safe procedures for charging the refrigerant system.

Troubleshooting

Start-Up Checklist

Pre-start-up

Verifying electrical, water, and air components before initial operation.

Start-up

Checking fan operation and compressor rotation during start-up.

Unit voltage - cooling operation

Control voltage

Temperatures

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