Product Overview
The MH Series vertical stack offers an innovative, labor-saving solution for spaces where individual, quiet control of the heating and cooling system is important. Using R454B refrigerant, the MH Series vertical stack not only protects the environment, it does so while delivering unprecedented comfort, efficiency, and reliability.
Vertical Stacks
Models MH09 - 36 60Hz - R454B
Illustration of the MH Series vertical stack unit, showcasing its compact, upright design suitable for various installations.
Visit www.comfort-aire.com for more information.
Standard Features
- 009 (3/4 ton) through 036 (3 tons)
- 208/230 1ph or 265 1ph voltage
- 1" Filters
- Removable chassis
- Double isolation compressor mounting
- PSC fan motor
- Cabinet can slide over riser ball valve
- Communicating CXM2 controls
- Eight standard safeties
- Tin plated coils
- Coaxial heat exchanger
- Field configuration of multiple discharge air and riser knock outs
Upgrade Options
- Choice of unit, ADA, or remote mounted thermostat
- Intelligent communicating DXM2.5 controls for maximized airflow control when paired with CV ECMS
- Constant Volume (CV) or Constant Torque (CT) ECM fan motors
- BACnet, Modbus and Johnson N2 compatibility options for DDC controls
- Stainless steel drain pan
- 2" Filters
- Power disconnect switch or breaker
- Factory configured discharge air with optional dust cover(s)
- Internally mounted motorized water valves and auto flow regulators
- Integrated power disconnect
- Ultra-Quiet sound attenuation package
- Modulating motorized water valve
- Internal 200 PSI load matching pump
- Riser options for sweat or crimped connections
- Hinged or flush mounted return air panel
Model Number Guide
The model number is structured to define various features and configurations. Below is a breakdown of the components:
Model Number Structure Example: MH M 09 G G S O S S C A A A
Chassis Model (Digits 3-6):
- 8: 816 Replacement Chassis
- R: TRM Replacement Chassis
- M: TSM Rev A-B Replacement Chassis
- S: TSL Rev A-B Replacement Chassis
- C: TSM Rev C Chassis
- D: TSL Rev C Chassis
Unit Size (Digits 4-5):
- 09 (3/4 ton)
- 12 (1 ton)
- 15 (1.25 ton)
- 18 (1.5 ton)
- 24 (2 tons)
- 30 (2.5 tons)
- 36 (3 tons)
Voltage (Digit 6):
- E: 265-1-60
- G: 208/230-1-60
Controls and Motors
| MOTOR | PSC | EC | CT | EC CV | N/A |
|---|---|---|---|---|---|
| 24V Controls | - | - | - | A | - |
| Electro-mechanical Controls | - | - | - | B | - |
| Line Voltage Controls | - | - | - | C | - |
| CXM2 Controls | D | F | - | - | - |
| DXM2 Controls | E | G | J | - | - |
Heat Exchanger Options (Digit 10):
- C: Copper Coax w/Non-Coated Air Coil
- N: Copper Coax w/Non-Coated Air Coil and Insulated Tubing
Water Valve & Pump Options (Digits 9-11):
- S: No Water Valve
- M: Standard Water Valve (NC)
- N: Standard Water Valve (NO)
- P: Internal Secondary Pump
- G: Standard 3-way Water Valve
- T: Modulating Water Valve
- H: Hydronic Heating w/Standard Water Valve (NC)
- J: Hydronic Heating w/Standard Water Valve (NO)
- L: Hydronic Heating w/3-way Water Valve
Other Options (Digit 13):
- M: MPC
- A: Standard
Revision (Digit 14):
- A: Current Revision
- Future: A=Not Used
Controls Options (Digits 7-8):
| RA SENSOR | COMM STAT | RIB RELAY | |
|---|---|---|---|
| S | - | - | - |
| A | X | - | - |
| B | - | X | - |
| C | - | - | X |
| D | - | X | X |
Optional Features (Digits 12, 13):
| OPTION | S.S. DRAIN PAN | MUTE |
|---|---|---|
| S | X | - |
| A | - | X |
| 1 | X | X |
| 2 | X | X |
Auto-Flow Regulator (US GPM) Code (Digit 12):
| GPM | 09 | 12 | 15 | 18 | 24 | 30 | 36 |
|---|---|---|---|---|---|---|---|
| 0 | NO FLOW REGULATOR | ||||||
| C | 1.5 | ||||||
| D | 2.0 | ||||||
| E | 2.5 | ||||||
| F | 3.0 | ||||||
| G | 3.5 | ||||||
| H | 4.0 | ||||||
| I | 5.0 | ||||||
| J | 6.0 | ||||||
| K | 7.0 | ||||||
| L | 8.0 | ||||||
| M | 9.0 | ||||||
| N | 10.5 | ||||||
Notes:
- If digit 3 = "S11 or "M" then digit 4, 5 = "09" or "12" only.
- If digit 3 = "8" then digit 4, 5 cannot equal "15".
- If digit 3 = "R" then digit 7 = "A".
- If digit 3 = 8 then digit 7 = "A", "B", or "C".
- If digit 3 = "M" or "S11 then digit 7 = "D", "E", "J".
- If digit 3 = "C" or "D" then digit 7 = "D", "E", "F", "G", or "J".
- If digit 3 = "8" or "R" then digit 10="8" or "A".
- If digit 3 = "M", "S", "C", "D", then digit 10 = 11S11, "B", "C", or "D".
- If digit 11 = "G" then digit 3 = "C" or 11D".
- If digit 11 = "T" then digit 7 = "E", "G", or "J" and digit 3 = "C" or "D".
- If digit 11 = "H", "J", "L", then digit 3 = "D".
- If digit 11 = "P" or "T" then digit 9 = "0".
- If digit 13 = "M" then digit 7 = "D", "F", "E", "G", or "J".
Performance Specifications
Tested to ASHRAE/AHRI/ISO 13256-1 ENGLISH (I-P) UNITS
| Model with ECM Motor | Water Loop Heat Pump | Ground Loop Heat Pump | ||||||
|---|---|---|---|---|---|---|---|---|
| Cooling 86°F | Heating 68°F | Cooling 77°F | Heating 32°F | |||||
| Capacity Btuh | EER Btuh/W | Capacity Btuh | COP | Capacity Btuh | EER Btuh/W | Capacity Btuh | COP | |
| MHM09 | 9200 | 14.3 | 12200 | 5.4 | 9700 | 16.2 | 7100 | 3.3 |
| MHM12 | 11800 | 14.1 | 15200 | 5.3 | 12100 | 16.8 | 9000 | 3.2 |
| MHM15 | 14600 | 15.9 | 17500 | 5.3 | 15500 | 18.8 | 11000 | 3.6 |
| MHM18 | 18000 | 15.2 | 22200 | 5.1 | 18500 | 17.3 | 13200 | 3.3 |
| MHM24 | 25000 | 15.7 | 32500 | 5.1 | 26500 | 18.5 | 18200 | 3.5 |
| MHM30 | 28000 | 15.1 | 34500 | 5.0 | 29000 | 17.6 | 22200 | 3.6 |
| MHM36 | 35000 | 14.6 | 40500 | 5.0 | 36000 | 16.5 | 25500 | 3.5 |
Cooling capacities based upon 80.6°F DB, 66.2°F WB entering air temperature. Heating capacities based upon 68°F DB, 59°F WB entering air temperature. All ratings based upon operation at lower voltage of dual voltage rated models.
Unit Size
| Model | W* | D* | H** |
|---|---|---|---|
| 09 - 12 | 17.0 | 17.0 | 88.0 |
| 15 - 18 | 19.25 | 19.0 | 88.0 |
| 24 - 36 | 24.0 | 24.0 | 88.0 |
* Not Including Riser
** Optional 80" Cabinet
Installation Visuals
Illustration showing the unit in a drywall stage, positioned in the floors above and below.
Illustration showing walls finished with the chassis pulled out.
Illustration showing a finished room.
MH Series Vertical Stacks
Models MH09 - 36 60Hz - R454B
This product complies with all California product labeling laws including, but not limited to, the Safe Drinking Water and Toxic Enforcement Act of 1986, more commonly known as Proposition 65.
Important Information
Due to ongoing product improvements, specifications and dimensions are subject to change and correction without notice or incurring obligations. Determining the application and suitability for use of any product is the responsibility of the installer. Additionally, the installer is responsible for verifying dimensional data on the actual product prior to beginning any installation preparations. Third party incentive and rebate programs have precise requirements as to product performance and certification. All products meet applicable regulations in effect on date of manufacture; however, certifications are not necessarily granted for the life of a product. Therefore, it is the responsibility of the applicant to determine whether a specific model qualifies for these incentive/rebate programs.
Manufacturer Information
©2025 MOTORS & ARMATURES, Inc.
MARS is a registered trademark of Motors & Armatures, Inc.
Comfort-Aire is a registered trademark of Motors & Armatures, Inc.
1900 Wellworth Ave., Jackson MI 49203
Phone: 517.787.2100
Website: www.marsdelivers.com
