The Dometic/Marine Air Chilled Water Master Control (CWMC / MCC Staging Controller) is the master “brain” of a multi-stage marine chiller plant. This unit (description CWMC OTS, SKU 9108552304) is the single-phase 230 V, 2-pump configuration with the display integrated in the lid. It commands the per-stage DDC control boards, sequences the seawater and chilled-water pumps, and manages cooling, heating and staging across the plant.
Technical overview
- Master staging controller for multi-stage marine chilled-water plants
- Commands per-stage DDC / PCB-405 control boards
- Sequences seawater and chilled-water pumps with run-time equalisation
- Backlit LCD interface with COOL / HEAT / SERVICE and STAGE indication
- “2 Pumps; Display in Lid” configuration
Technical Specifications
| Description | CWMC OTS (Chilled Water Master Control) |
|---|---|
| SKU | 9108552304 |
| MFG No. | 263600141 (as marked) |
| Voltage / Hz | 230 V / 50-60 Hz, single phase (as marked) |
| Pumps | 2-pump control |
| Display | Backlit LCD, display in lid |
| Controls | Per-stage DDC boards; up to multiple chiller stages |
| Brand | Dometic / Marine Air Systems |
Applications
Compatible Equipment
OEM / Cross References
As marked / for identification only — confirm fitment before ordering.
Industries Served
Frequently Asked Questions
What is the CWMC / MCC staging controller?
It is the master control for a marine chilled-water (chiller) plant. It commands the individual DDC stage boards, sequences the seawater and chilled-water pumps, and manages staging, cooling and heating across the whole plant.
Is this the same as an MCC controller?
Dometic markets the chilled-water master control as CWMC, and the functionally equivalent Micro-Air unit as MCC. This unit is labelled “MCC Staging Controller / CWMC OTS”. Confirm your plant’s exact configuration before ordering.
What does “2 pumps, display in lid” mean?
This variant controls two pumps and has the LCD display built into the enclosure lid, rather than a remote display. It is the 230 V single-phase configuration.