Heat Controller manual Special DXM2 Application Notes / Accessory Relays

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Application, Operation, & Maintenance Manual

DXM2 UNIT CONTROLS

Heat Controller, Inc.

DXM2 Controls

airflow for the current operating mode. For the first

30 seconds of blower operation, the target airflow will be 50% of the normal target airflow. For the next 90 seconds of blower operation, the target airflow will be 75% of the normal target airflow. For Constant Fan, Emergency Heat, and Test Mode operation, the Soft Start Ramping profile is bypassed, and the ECM immediately ramps up to the normal target airflow.

c)Blower Off Delays – For ECM blower off delays, the target airflow will be adjusted to 50% of normal target airflow before the beginning of the blower off delay.

d)Default Blower Operation – If the DXM2 configuration is incorrect or incomplete with an ECM Blower connected, the ECM will be operated using default target airflows and operating parameters, and an ECM configuration fault will be active.

Hot Water Generator Operation – When the DXM2 is configured to operate a hot water generator pump, the pump will be directly controlled by the K2 relay, based on the S3 dipswitch settings and the T5 (hot water temperature) and T6 (compressor discharge temperature) inputs. Hot water generator operating features include:

a)HWG operating setpoint selection (S3–3)

b)Temperature offset verification for efficient HWG operation

c)HWG test mode (S3–2)

Proportional Valve Operation – When the DXM2 is configured to operate a proportional valve (optional), the valve will be directly controlled by the DXM2. For controlling the proportional valve, the DXM2 monitors the entering water temperature and leaving water temperature. The valve is controlled in the following way:

a)Maintain the appropriate temperature difference across the water coil (EWT–LWT for heating, LWT–EWT for cooling).

b)Maintain the leaving water temperature below the appropriate Maximum Heating LWT and above the Minimum Cooling LWT limits.

SPECIAL DXM2 APPLICATION NOTES / ACCESSORY RELAYS

Generally the following applications are based upon configuring the accessory relays.

Cycle with Fan – If Accessory relay 1 is configured to “cycle with fan”, Accessory relay 1 will be on any time the Fan Enable relay, or ECM Blower is on.

Cycle with Compressor – If Accessory relay 2 is

configured to “cycle with compressor”, Accessory relay 2 will be on any time the Compressor relay is on.

Digital Night Setback – If an Accessory relay is configured for Digital NSB, the Accessory relay will be on any time the NSB input is connected to Ground “C”.

Note: If there are no Accessory relays configured for Digital NSB, and the DXM2 is not connected to a communicating thermostat configured for night setback, then the NSB and OVR inputs are automatically configured for “mechanical” operation. See Mechanical NSB operation below.

Note: Digital Night Setback feature requires a compatible thermostat. Contact the manufacturer for information on compatible thermostats.

Mechanical Night Setback – When the NSB input is connected to Ground “C”, all thermostat inputs (G, Y1, Y2, W, and O) are ignored. A thermostat setback Heating call can then be connected to the OVR input. If the OVR input becomes active, then the DXM2will enter NLL Staged Heating Mode. NLL Staged Heating Mode would then provide heating during the NSB period.

Water Valve/Slow Opening – If an Accessory relay is configured for Water Valve/Slow Opening, the Accessory relay will turn on 60 seconds prior to the Compressor Relay turning on.

Outside Air Damper – If an Accessory relay is configured for OAD, the Accessory relay will normally turn on any time the Fan Enable relay is on. But, following a return from NSB (NSB input no longer connected to Ground “C”) to Normal Mode, the Accessory Relay will not turn on for 30 minutes even if the Fan Enable Relay is on. After this 30-minute timer expires, the Accessory Relay will turn on if the Fan Enable Relay is on.

Humidifier – If Accessory relay 2 is configured for a Humidifier, the Accessory relay will be on any time the H input is active.

Hydronic Economizer – If Accessory relay 1 is configured to be used as a hydronic economizer, normal cooling operation will be modified.

If Accessory relay 1 is configured as a single stage hydronic economizer, when a first stage cooling demand is present and the H input is active, the accessory relay will be activated instead of the compressor output. All other heat pump operating modes will operate normally, and the accessory relay will be off in all other operating modes.

If Accessory relay 1 is configured as a hydronic economizer for both stages, when a first stage cooling demand is present and the H input is active, the accessory relay will be activated instead of the compressor output. When a second stage cooling demand is present with the H input active, the accessory relay will be activated in addition

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Contents DXM2 Digital Heat Pump Controller Table of Contents DXM2 Electronic Heat Pump Controls DXM2 OverviewDXM2 Physical Dimensions & Layout Test P12DXM2 Layout and Connections P11 P10DIP Switches DXM2 ControlsField Selectable Inputs DIP Package #1 S1DIP Package #3 S3 DIP Package #2 S2Safety Features Fault CodesLockout with Emergency Heat If the DXM2 is Unit Operation Description LED and Alarm Relay Output Table DXM2 Controls Special DXM2 Application Notes / Accessory Relays Thermostat Inputs With Resulting Demands Other Outputs System Inputs with the resulting demandCommunications DXM2 SensorsDXM2 Service & Application Notes Pressure SwitchesDXM2 Thermostat Details Thermostat CompatibilityBasic Troubleshooting Information Advanced Troubleshooting and Configuration Information GeneralSystem Configuration Service Mode Troubleshooting Chart Start024 DXM2 Wiring Diagram Standard Installation 96B0005N56 Functional Troubleshooting Fault Htg Clg Possible Cause SolutionESD ERV Fault DXM Only Performance Troubleshooting Symptom Htg Clg Possible Cause SolutionDXM2 Unit Controls 2012

DXM2 specifications

The Heat Controller DXM2 is an advanced heating and cooling solution, meticulously designed for residential and commercial applications. This sophisticated unit integrates modern technologies to deliver superior climate control, ensuring comfort while maintaining energy efficiency. Among its standout features are its intuitive operation, flexibility in installation, and superior performance metrics.

One of the key attributes of the DXM2 is its advanced inverter technology, which allows for variable speed operation. This feature enables the system to adjust its output based on real-time cooling or heating demands, resulting in reduced energy consumption and lower utility bills. The inverter technology not only promotes efficiency but also enhances the system's operational longevity, as it reduces the wear and tear typically associated with traditional HVAC systems that operate at fixed speeds.

The unit boasts a user-friendly interface that allows for seamless control. With its advanced remote control and optional smartphone app connectivity, users can effortlessly adjust settings from anywhere, making it a perfect fit for today’s tech-savvy homeowners. This flexibility ensures that comfort can be customized according to personal preferences and schedules.

Additionally, the DXM2 is equipped with a multi-stage filtration system that actively removes dust, allergens, and other airborne particles, contributing to improved indoor air quality. This feature is particularly beneficial for individuals with allergies or respiratory issues, as it ensures cleaner air circulating throughout the living space.

The system’s whisper-quiet operation sets it apart from many competitors in the market. With noise levels comparable to a soft breeze, the DXM2 provides comfort without disruptive sounds, making it ideal for bedrooms, offices, and quiet spaces.

Moreover, the DXM2 offers enhanced durability and reliability due to its robust construction and high-quality components. The unit is designed to withstand harsh weather conditions and varying environments, ensuring consistent performance year-round.

Another noteworthy characteristic is its eco-friendly refrigerant, which aligns with contemporary environmental standards. This selection contributes to lower greenhouse gas emissions while maintaining efficiency and effectiveness in both heating and cooling modes.

In conclusion, the Heat Controller DXM2 is a prominent choice for anyone seeking a reliable and efficient climate control system. Its combination of advanced technology, customizable features, superior air quality management, and low noise levels positions it as a leader in the heating and cooling industry. Ultimately, the DXM2 is engineered to meet the demands of modern living, creating comfortable environments with unparalleled convenience and efficiency.