ClimateMaster Tranquility 16 Series

Questions and Answers

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Gary MclaughlinAug 18, 2025
What to do if my ClimateMaster Tranquility 16 has a HP Fault Code 2 High Pressure?
- D
  Daniel NguyenAug 18, 2025
  If your ClimateMaster Heat Pump displays a High Pressure fault, several issues could be the cause. In cooling mode, check for reduced or no water flow by inspecting the pump and valve operation/settings, and adjust the water flow to the correct rate, also ensure the water temperature is within the proper range. In heating mode, check for a dirty air filter and clean or replace it, verify the fan motor operation and look for any airflow restrictions, and also ensure the return air temperature is within the design parameters. Other causes include an overcharged refrigerant level (check superheat/subcooling) or a faulty HP switch (check continuity and replace if necessary).
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Katherine JacobsAug 20, 2025
What causes my ClimateMaster Tranquility 16 Heat Pump to short cycle and how to fix it?
- A
  afrancoAug 20, 2025
  Short cycling in your ClimateMaster Heat Pump can be caused by a dirty air filter (check and clean it), the unit being stuck in "test mode" (reset power or wait 20 minutes for auto exit), an oversized unit for the space (check sizing for actual load), or a compressor overload (check and replace if necessary).
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Garrett BrightAug 23, 2025
Why does my ClimateMaster Tranquility 16 only run the fan?
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  Victoria WarrenAug 23, 2025
  If your ClimateMaster Heat Pump only runs the fan, make sure the thermostat is set for heating or cooling. Check for any lockout codes and reset the power. Inspect the compressor overload and replace it if necessary. Also, check the thermostat wiring at the heat pump, and try jumpering Y and R for compressor operation in test mode.
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Stephanie WagnerAug 26, 2025
What to do if my ClimateMaster Heat Pump is not operating in cooling mode?
- A
  allenpamelaAug 26, 2025
  If your ClimateMaster Heat Pump isn't operating in cooling mode, first check the reversing valve by setting it for cooling demand and verifying 24VAC on the RV coil and at the CXM/DXM board. If the reversing valve is stuck, try running high pressure up by reducing water flow and while operating, engage and disengage RV coil voltage to push the valve. Also, check the thermostat setup to ensure it's set to 'O' for the reversing valve, not 'B'. Verify the O wiring at the heat pump and jumper O and R to listen for an RV coil 'click'. Put the thermostat in cooling mode and check the voltage on O and W to ensure the thermostat is wired correctly.
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Brian KingAug 27, 2025
What to do if my ClimateMaster Tranquility 16 has LP/LOC Fault Code 3 Low Pressure / Loss of Charge?
- C
  Connie MedinaAug 27, 2025
  If your ClimateMaster Heat Pump shows a Low Pressure/Loss of Charge fault, it could be due to insufficient charge. Check for refrigerant leaks. Also, if the compressor pumps down at start-up, check the charge and start-up water flow.
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Heather CamachoAug 30, 2025
How to fix condensate fault code 6 on my ClimateMaster Heat Pump?
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  hallhenryAug 30, 2025
  To address Condensate Fault Code 6 on your ClimateMaster Heat Pump, check for a blocked drain and clean it. Ensure the trap dimensions and location are correct, positioned ahead of the vent. Verify proper drainage by checking the piping slope away from the unit and the unit's slope toward the outlet. Also, check the vent location for proper venting. Inspect for moisture shorting to the air coil and replace the air filter if it's plugged. Finally, identify and eliminate any restrictions in the return air flow, increasing the return duct and/or grille size if necessary.
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Lisa WelchSep 1, 2025
Why does my ClimateMaster Tranquility 16 only run the compressor?
- I
  iallenSep 1, 2025
  If your ClimateMaster Heat Pump only runs the compressor, check the G wiring at the heat pump and jumper G and R for fan operation. Also, jumper G and R for fan operation and check for line voltage across BR contacts on the fan motor relay. Check the fan power enable relay operation (if present). Verify line voltage at the motor and check the capacitor. Finally, check the thermostat wiring at the heat pump, and try jumpering Y and R for compressor operation in test mode.
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Rebecca Mason DVMSep 4, 2025
What causes LT1 Fault Code 4 Water coil low temperature limit on ClimateMaster Tranquility 16 Heat Pump?
- R
  roblesaliciaSep 4, 2025
  If your ClimateMaster Heat Pump displays a Water coil low temperature limit fault, it could be due to reduced or no water flow in heating. Check the pump and water valve operation/setting. Inspect for a plugged strainer or filter and clean or replace it. Ensure the water flow is adjusted to the proper rate. Verify adequate antifreeze level with a hydrometer. Check the temperature limit setting and clip JW3 jumper for antifreeze use if needed. Ensure the water temperature is within the design parameters and check the thermistor's temperature and impedance correlation per the chart.
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Lauren ParkSep 7, 2025
What causes LT2 Fault Code 5 Air coil low temperature limit on ClimateMaster Heat Pump?
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  Mary GonzalezSep 7, 2025
  If your ClimateMaster Heat Pump shows an Air coil low temperature limit fault, check for a dirty air filter and clean or replace it. Inspect the fan motor operation and airflow restrictions. Verify that the external static pressure is not too high. Ensure the entering air temperature is within design parameters. The temperature limit setting should be 30°F unless otherwise required. Also, check the thermistor's temperature and impedance correlation per chart.
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Lisa VincentSep 9, 2025
What does Unit Performance Sentinel Code 8 mean on my ClimateMaster Tranquility 16?
- A
  Aaron PowersSep 9, 2025
  If your ClimateMaster Heat Pump displays Unit Performance Sentinel Code 8, in heating mode, if FP2 is greater than 125°F [52°C], check for poor air flow or an overcharged unit. In cooling mode, if FP1 is greater than 125°F [52°C] or FP2 is less than 40ºF [4ºC], check for poor water flow or air flow.

Summary

Model Nomenclature

General Overview

Provides a general overview of the model nomenclature system.

General Information

Safety and Precautions

Details important safety warnings, cautions, and notices for installation and service.

Pre-Installation Guidelines

Outlines essential checks and preparations before installing the unit.

Horizontal Unit Installation

Location and Mounting

Specifies requirements for selecting and mounting horizontal units.

Air Discharge Field Conversion

Side to Back Discharge Conversion

Instructions for converting air discharge from side to back.

Back to Side Discharge Conversion

Instructions for converting air discharge from back to side.

Left vs. Right Return Air

Notes on the limitations of converting return air paths.

Horizontal Unit Condensate Piping

Duct System Installation

Vertical Unit Installation and Location

Location and Mounting

Details site selection, mounting, and clearance requirements for vertical units.

Vertical Unit Sound Attenuation

Vertical Unit Condensate Piping

Piping Installation Guidelines

Supply and Return Piping

Provides guidelines for installing supply and return piping, including bend radii.

Commercial Water Loop Systems

Water-Loop Heat Pump Systems

Ground-Loop Heat Pump Systems

Pre-Installation and Testing

Covers pre-installation steps, loop testing, and flushing for ground loops.

Antifreeze Requirements

Details antifreeze selection and concentration for freeze protection.

Ground-Water Heat Pump Systems

Open Loop Systems

Describes installation and water quality considerations for open loop systems.

Water Coil Low Temp Limit Setting

Water Quality Standards

Electrical - Line Voltage Wiring

Transformer Requirements

Details transformer confirmation and wiring for dual voltage units.

Electrical - Power Wiring

Power Connection and Wiring

Explains line voltage power connection and compliance with electrical codes.

Blower Speed Selection

Describes how to change fan speed using PSC motor wiring.

Electrical - Low Voltage Wiring

Thermostat Connections

Details wiring the thermostat directly to the CXM or DXM control board.

Low Water Temperature Cutout Selection

Electrical - Low Voltage Wiring

Accessory Connections

Covers accessory connections and provides low voltage VA ratings.

Electrical - Thermostat Wiring

Thermostat Installation and Wiring

Guides thermostat placement, wiring, and connection to the control board.

Typical Wiring Diagram - Single Phase 50 Hz TC Units with CXM Controller

Typical Wiring Diagram - Single Phase 50 Hz TC Units with DXM Controller

Typical Wiring Diagram - Single Phase 50 Hz TC Units with CXM Controller and MPC (DDC) Controls

Typical Wiring Diagram - Three Phase 50 Hz TC Units with CXM Controller

Typical Wiring Diagram - Three Phase 50 Hz TC Units with DXM Controller

Typical Wiring Diagram - Three Phase 50 Hz TC Units with DXM Controller and MPC (DDC) Controls

CXM Control Features

CXM Control Details

Details CXM control information, selectable inputs, and retry modes.

Field Configuration Options

Explains field configuration options for temperature limits and DIP switches.

DXM Control Features

DXM Control Details

Details DXM control, selectable inputs, and retry modes.

DXM Field Configuration Options

Explains field configuration options for temperature limits, alarm relays, and DIP switches.

Thermostat and Dehumidification Settings

Boilerless Operation Settings

Details boilerless operation and temperature changeover setpoints.

Accessory Relay Personality

Defines accessory relay personality and DIP switch settings for ACC1 and ACC2.

CXM;DXM Control Safety Features

Compressor Protection

Details anti-short cycle, random start, and lockout protections for the compressor.

Faults and Lockout Codes

Explains high/low pressure, temperature, and voltage fault conditions and lockout codes.

Unit Performance Sentinel (UPS)

Describes the UPS feature for detecting inefficient heat pump operation.

Thermistor Swap and ESD Detection

CXM;DXM Start-up Operation

Operating Limits and Conditions

Operating Conditions

Defines environmental, power supply, and operating condition parameters.

Commissioning Conditions

Specifies starting conditions for bringing the building space to occupancy temperatures.

Piping System Cleaning and Flushing

Unit Start-Up and Operating Conditions

Unit and System Checkout

Provides a comprehensive checkout list before powering the system and for system verification.

Unit Start-Up Procedure

Preventive Maintenance Schedule

Coil, Filter, and Drain Maintenance

Details maintenance for water coils, filters, and condensate drains.

Compressor, Fan Motor, and Air Coil Care

Covers periodic checks for compressors, fan motors, and cleaning the air coil.

Cabinet and Refrigerant System Checks

Outlines cabinet cleaning and refrigerant system checks for integrity.

Functional Troubleshooting

Performance Troubleshooting

Functional Troubleshooting (S-I Units)

Warranty

Revision History

ClimateMaster Tranquility 16 Series Specifications

General

Refrigerant	R-410A
Type	Water Source Heat Pump
Efficiency Rating (Cooling)	Up to 16 EER
Efficiency Rating (Heating)	Up to 4.0 COP
Compressor Type	Scroll Compressor
Voltage Options	208-230V, 1-phase
Application	Geothermal
Stages	Single Stage
Cooling Capacity	0.5 to 6 tons
Heating Capacity	0.5 to 6 tons