Rheem 3–6 Ton Downflow Economizer, Single Enthalpy — RXRD-01MCDBM3
The Rheem RXRD-01MCDBM3 is a factory-matched downflow economizer for Rheem RGECYB 3–6 ton commercial package units. This DDC economizer pairs a MicroMetl damper assembly with a Honeywell controller and a single-enthalpy sensor, so the unit can bring in cool, dry outdoor air for “free cooling” whenever outdoor conditions are suitable — cutting mechanical cooling run time and energy use. It is designed to drop into the economizer opening of a downflow RGECYB rooftop and is pre-wired for fast field installation.
Which Package Units Does This Economizer Fit?
The RXRD-01MCDBM3 is a factory accessory sized for Rheem RGECYB 3–6 ton package units configured for downflow airflow. It is not a stand-alone product — it installs into the economizer section of a compatible rooftop unit, which is pre-wired to accept it. Match the economizer to a downflow RGECYB unit; a horizontal-airflow application uses the horizontal economizer (RXRD-01MCHBM3).
Single-enthalpy control measures outdoor-air enthalpy (heat plus humidity) and opens the outdoor-air dampers for free cooling when the outdoor air is cooler and drier than return air, then modulates back when it is not. This is a DDC economizer built around a Honeywell controller.
Compatible RGECYB package units include:
- 3 Ton RGECYB 208/230V 3-phase, 75,000 BTU heat — RGECYB036ACT07BAAAA0
- 4 Ton RGECYB 208/230V 3-phase, 125,000 BTU heat — RGECYB048ACT12BAAAA0
- 5 Ton RGECYB 208/230V 3-phase, 125,000 BTU heat — RGECYB060ACT12BAAAA0
- 6 Ton RGECYB 208/230V 3-phase, 125,000 BTU heat — RGECYB072ACT12BAAAA0
- 3 Ton RGECYB 460V 3-phase, 100,000 BTU heat — RGECYB036ADT10BAAAA0
- 6 Ton RGECYB 460V 3-phase, 125,000 BTU heat — RGECYB072ADT12BAAAA0
Horizontal installations: use the RXRD-01MCHBM3 horizontal-configuration economizer instead.
Confirm airflow orientation (downflow vs. horizontal) and unit compatibility before ordering. Need help selecting? Request free assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Model Number | RXRD-01MCDBM3 |
|---|---|
| Product Type | Factory-Matched Field-Installed Economizer (Free Cooling) |
| Configuration | Downflow |
| Control | DDC, Single Enthalpy (MicroMetl assembly with Honeywell controller) |
| Compatible Units | Rheem RGECYB 3–6 Ton Packaged Gas/Electric Units (downflow) |
| Function | Brings in outdoor air for free cooling when outdoor enthalpy is favorable |
| Installation | Slide-in economizer section, pre-wired for the unit's controls |
This economizer is a factory accessory for RGECYB package units and cannot be used on its own. Pair it with a compatible Rheem packaged unit, or browse more Rheem equipment.
Unit Features
Free Cooling & Control
- Single-enthalpy control senses outdoor-air heat and humidity for accurate free-cooling decisions
- DDC economizer built around a Honeywell controller
- Reduces mechanical cooling run time and energy use in suitable weather
- Modulates outdoor-air dampers to maintain supply-air conditions
- Supports code-required economizer operation (ASHRAE 90.1 / Title 24 style requirements)
Construction & Installation
- MicroMetl damper assembly matched to the RGECYB cabinet
- Downflow configuration for curbed rooftop installations
- Pre-wired to the unit's economizer harness for fast installation
- Factory accessory — installs in the unit's dedicated economizer opening
- Horizontal counterpart (RXRD-01MCHBM3) available for side-flow units
Specifications & Manuals
Economizer application and installation details are covered in the RGEC series technical specifications and installation instructions. Confirm the correct economizer for your unit's airflow configuration before ordering.
Frequently Asked Questions
What does the RXRD-01MCDBM3 economizer do?
It lets a Rheem RGECYB package unit use cool, dry outdoor air for “free cooling” when conditions allow, reducing how often the compressor has to run and lowering cooling energy use.
Which units is this economizer compatible with?
Rheem RGECYB 3–6 ton packaged gas/electric units set up for downflow airflow. It installs in the unit's pre-wired economizer section. For horizontal airflow, use the RXRD-01MCHBM3.
What is single-enthalpy control?
Single-enthalpy control measures the total heat content (temperature plus humidity) of the outdoor air and opens the economizer dampers for free cooling only when the outdoor air is genuinely cooler and drier than the return air.
Is it downflow or horizontal?
This model (RXRD-01MCDBM3) is the downflow configuration. Rheem offers a matching horizontal economizer, RXRD-01MCHBM3, for horizontal-airflow installations.
Can this economizer be used on its own?
No. It is a factory accessory that installs inside a compatible Rheem RGECYB package unit and relies on the unit's controls; it is not a stand-alone device.
