Carrier Aquazone 50RHE 036 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:

S
Samantha ClineAug 18, 2025
Why is my Carrier Aquazone 50RHE 036 Heat Pump insufficient capacity/not cooling or heating properly?
- B
  Blake NormanAug 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.
A
Anthony BurkeAug 20, 2025
What to do if my Carrier Aquazone 50RHE 036 Heat Pump has main power problems?
- H
  hornryanAug 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.
B
Brian PayneAug 23, 2025
What to do if my Carrier Aquazone 50RHE 036 shows HP fault - code 2 High pressure?
- M
  middletonrachelAug 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.
M
Matthew DuffyAug 28, 2025
What to do if my Carrier Aquazone 50RHE 036 has LP/LOC fault - code 3 Low pressure/loss of charge?
- J
  Jonathan WoodsAug 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.
T
Todd NavarroAug 30, 2025
What to do if my Carrier Aquazone 50RHE 036 shows FP1 fault - code 4 Water freeze protection?
- M
  Michelle LeonardAug 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.
C
Charles ZamoraSep 1, 2025
What to do if my Carrier Heat Pump shows FP2 fault - code 5 Air coil freeze protection?
- A
  Amanda BlakeSep 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.
C
Connie LongSep 3, 2025
What to do if my Carrier Heat Pump has Condensate fault - code 6?
- S
  Sarah ThomasSep 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.
A
awhiteSep 6, 2025
What to do if my Carrier Heat Pump shows Over/under voltage - code 7?
- S
  Stacy WilliamsSep 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.
B
Brittney HodgeSep 8, 2025
Why does my Carrier Aquazone 50RHE 036 Heat Pump unit short cycles?
- P
  Patrick HooverSep 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.
E
elizabethharrisSep 12, 2025
Why my Carrier Aquazone 50RHE 036 Heat Pump only fan runs?
- J
  Jack HobbsSep 12, 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 036 Specifications

General

Model Number	50RHE 036
Category	Heat Pump
Cooling Capacity	10.5 kW
Heating Capacity	11.5 kW
Refrigerant Type	R-410A

Summary

Safety Considerations

Installation

Jobsite Preparation and Unit Inspection

Procedures for checking jobsite readiness, unit condition, storage, protection, and inspection.

Unit Location, Mounting, and Ductwork

Guidelines for unit location, mounting, duct system design, and sound attenuation.

Drainage, Piping, and Electrical Connections

Requirements for condensate drainage, piping connections, and electrical wiring.

Low Voltage Wiring and Blower Speed

Instructions for low voltage wiring, freeze protection, and blower speed selection.

Pre-Start-Up and Field Configuration

System Checkout and Air Coil Preparation

Checklist for installation completion and air coil cleaning before unit start-up.

Control Configuration: Jumpers and DIP Switches

Setting freeze protection, alarm relays, and operational modes via jumpers and DIP switches.

Start-Up Procedures

Operating Limits and Initial Start-Up

Understanding unit operating limits and initial start-up procedures in cooling and heating modes.

Compressor, Flow Regulation, and Flushing

Verifying compressor rotation, regulating water flow, and flushing the system.

Anti-freeze and System Operations

Using anti-freeze, and operational modes for cooling tower and ground coupled systems.

Unit Operation Modes and Control Sequences

Detailed operation sequences for Complete C and Deluxe D controls in various modes.

System Test and Service

System Test Mode and LED Diagnostics

Procedures for entering test mode and understanding control LED indicators for diagnostics.

Routine Service and Component Maintenance

Maintenance tasks including filters, water coil, condensate pans, and refrigerant system checks.

Coil Cleaning and System Charge Verification

Procedures for cleaning air coils, condensers, and checking the refrigerant system charge.

Troubleshooting and Start-Up Checklist

Troubleshooting Common Faults and Sensors

Identifying and resolving common issues related to thermistors, sensors, and system faults.

Unit Start-Up Checklist

A comprehensive checklist to ensure proper unit installation and start-up.

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