REFCO Combi Universal Condensate Pump
Model: 3004146
Key Features
- Quiet mode: Installer-configurable pump performance using DIP-switches to optimize each individual installation for the best performance and sound parameters.
- Diagnostic LED: Patented two-color long-life LED to ensure correct initial installation and to assist in diagnostics on future service calls.
- USB connection: Patented access for wholesalers or installing contractors to review pump history.
- Digital sensor: Unique digital water level sensor with no moving parts to get stuck or clogged.
- Universal application: Widest application range for exposed mount pumps in the market from 6,000 Btu/H to 120,000 Btu/H (1.75kW to 35kW).
- Integrated replaceable 6.3A fuse: Factory-installed replaceable 5 x 20 mm HRC 6.3A fuse for alarm relay operation.
Technical Specifications
| Specification | Value |
|---|---|
| Power rating | 100-240V, 50-60 Hz, 8W |
| Alarm relay | Rated 125VAC 7A or 250VAC 2.5A |
| Minimum flow rate | 11 GPH (42 l/hr.) |
| Maximum suction | 9.80 ft. (3.0 m) |
| Maximum head | 65.60 ft. (20.0 m) |
| Maximum horizontal run | 330 ft. (100 m) at 0 head and 0 suction |
| Sound | 19dBA at 1 m DIN EN ISO 3741:2011 / DIN EN ISO 3744:2010 |
| Discharge star tube | 1/4" (6.25 mm) ID, 3.3 ft. (1m) in length |
| Overall dimensions | 9.84 x 11.81 x 2.1 inches (250 x 340 x 54 mm) |
| Bulk pack | 10 Pcs dimensions are 23.2 x 10.4 x 14.4 inches (590 x 265 x 365 mm) |
| Color | RAL #7040 grey and RAL #1023 yellow |
| Protection | Fully potted, IP-44 |
| Weight | 0.63 lbs. (285 g) |
| Operating temperature | Ambient & water 41-104°F (5-40°C) |
| Compliance | Motor-Operated Water Pumps UL 778 and Liquid Pumps CSA C22.2#108; Fire Test for Heat and Visible Smoke Release for Discrete Products and their Accessories installed in Air Handling spaces UL 2043 (plenum rated) |
Safety Instructions
The Combi Condensate pump is to be installed in accordance with local and regional electrical codes.
Save these instructions for further reference.
The following symbols related to safety are used on the product or throughout the product documentation:
- ⚠️ WARNING/CAUTION: An appropriate safety instruction should be followed or caution to a potential hazard exists.
- ⚡ DANGEROUS VOLTAGE: To indicate hazards arising from dangerous voltages.
WARNING: Please read all safety instructions and the installation instructions completely before commencing. To prevent any risk, only certified and appropriately trained staff with sufficient technical training and tools shall install this product. Product installation and electrical connections both require professional training for safe installation and correct product operation.
WARNING: Disconnect all electrical power before starting installation, maintenance, or service work.
WARNING: Disconnect electrical power before removing and checking internal fuse.
CAUTION: This pump is not submersible and for indoor use and connection only.
CAUTION: Do not install The REFCO condensate pump if there are any signs of damage.
WARNING: Check the cables of the REFCO condensate pump power and alarm cords prior to, during and periodically for signs of damage. If either the power or alarm cords are damaged, isolate and disconnect the condensate pump from service. Contact REFCO for a replacement.
Note: The Combi combined power/alarm cable lead-out is non-replaceable. If this is damaged, the entire pump must be replaced.
WARNING: The REFCO condensate pump cables should not be cut, and should be routed so that they cannot be damaged during and after installation.
CAUTION: All tubing connections are to be secured in place on the barb connections using self-locking cable tie-wraps.
DO NOT use tools to connect the tubing.
DO NOT operate this product in ambient temperatures below 41 °F (5 °C).
DO NOT operate with incoming water above a temperature of 104 °F (40 °C).
CAUTION: Do not allow any chemicals to come in contact with this condensate pump. Please remove the pump and water sensor before using any coil cleaning solutions and other chemicals. Flush the evaporator coils with water before re-installing the condensate pump and water sensor. Ensure the coils are chemical-free before reinstallation.
WARNING: If the Combi pump is to be installed within a duct, air handling space or plenum, it must be installed within an appropriately rated fire and smoke proof enclosure.
Pump Overview and Accessories
The pump features several key components:
- 1. Diagnostic LED: Provides status indication.
- 2. USB port: For accessing pump history.
- 3. DIP-switches: For configuring pump performance.
- 4. Water sensor plug: Connects the water sensor.
- 5. Pump body: The main housing of the pump.
- 6. Factory-installed alarm relay fuse: Integrated fuse for alarm relay.
- 7. Digital sensor: Detects water level without moving parts.
- 8. Water sensor: Detects water presence.
Supplied Accessories:
- Filter (FIL-4063/4)
- Sensor cable (Part No. 4687950)
- Power cable (Type: SVT 18AWG*3C Cable, Part No. 3004139)
- Alarm cable (Part No. 3004166)
- Suction tube (Part No. 3004034)
- Star tube and Stop-Siphon device (Part No. 3004065)
- Alarm relay HRC 6.3A fuse (Part No. 3004180)
- Vent tube (Part No. 3004033)
- Cable ties
Application and Installation
The Combi Condensate pump is designed for various HVAC applications.
Installation Types:
1a. Horizontal Installation: Install the ventilation hose. Ensure the green stop-siphon device is installed at the highest point. Do not force connections.
1b. Vertical Installation: Place the silicone plug on the water sensor. Ensure the green stop-siphon device is installed at the highest point. Do not force connections.
DIP Switch Settings (Ratings for air conditioning units):
The DIP switches allow configuration for different cooling capacities:
- Low: up to 18K Btu/h (5.3kW)
- Medium-Low: up to 42K Btu/h (12kW)
- Medium-High: up to 72K Btu/h (21.1kW)
- High: up to 120K Btu/h (35kW)
Examples are for reference only.
Electrical Connections:
Diagram 1: When Indoor Evaporator Unit is powered from the Outdoor Condenser Unit
This diagram illustrates the wiring between the indoor evaporator and outdoor condenser units. It details input power (100-240V, 50/60Hz, 2.5A MAX) and alarm relay connections (125V 6.3A max or 250V 2.5A max). It emphasizes following safety instructions, isolating power, and installing in accordance with electrical codes. A note mentions the alarm relay fuse rating (HRC type, e.g., T6.3AH250V for 125V, T2.5AH250V for 250V) and the option of installing a supplementary fuse (T0.2AH250V).
Diagram 2: Power only with no alarm circuit
This diagram shows a simplified connection where the alarm cable is not used. It warns that water damage can occur if the drain line is kinked, pinched, or plugged.
Diagram 3: When Outdoor Condenser is powered from the Indoor Evaporator Unit
This diagram shows the wiring when the outdoor condenser unit powers the indoor evaporator. It details input power and alarm relay connections, similar to Diagram 1, with notes on fuse ratings and electrical codes. It also mentions the connection is made inside the indoor evaporator.
Diagram 4: When Multi-Split System is installed
This diagram illustrates the wiring for a multi-split system, showing connections between the VRF Condenser Unit (Outdoor) and Evaporator Units (Indoor), including the condensate pump and alarm relay.
Troubleshooting
| Fault | Correction |
|---|---|
| No LED lights | Check incoming voltage (blue and brown wires). Verify power and alarm wires are not crossed. Note: Old COMBI #3004046 has opposite connectors. |
| Pump runs constantly | Check filter placement (water filter should not touch digital sensor). Clean digital sensor for dirt/mold/debris with distilled water or alcohol-based liquid. Check all tubing connections are secure and drain line is clear of clogs, kinks, or pinching. If pump runs constantly with water flowing from drain line, adjust DIP-switch power settings to increase capacity, as the system may have too much water or lift for the current setting. |
| Pump will not run | Check for power at blue and brown wires. If LED blinks green, pump is on standby waiting for water; add water to sensor. If LED blinks green and water is present, check sensor cable connections at both ends. Ensure connectors are inserted correctly and not forced. |
| A/C unit is off / Air conditioner turns off the pump | If the pump LED status is solid red (not blinking) and alarm wiring is connected properly, the alarm relay is intentionally stopping the A/C unit to prevent overflow. This is normal. If alarm wiring is used, check HRC alarm fuse for continuity and replace if necessary. If alarm wiring is used and wiring is correct, check status LED; if OFF, there's a power supply or pump fault. During alarm status, the pump runs to lower water level. It will automatically reset the alarm relay when the water level is low enough. Many outdoor units have a 5-minute delay before restarting. |
| Alarm is activated (LED solid red) | Indicates too much incoming water for the pump to handle. The digital sensor trips the alarm relay, stopping power to the A/C system (if alarm wiring is used). Possible causes: blocked/kinked/pinched drain line, incorrect capacity settings, or high vertical lift. Check alarm cable installation. If alarm is not used and drain line is blocked, pump can overflow; always use the alarm function. |
| Water is dripping | Check all hose connections. High head pressure can dislodge hoses; use factory-supplied cable ties. Check filter placement; if touching the digital sensor, it may activate the pump incorrectly. Clean sensor and filter. Configure pump capacity correctly for A/C capacity and drain line lift/run. |
| Pump is noisy | Check for and correct any siphon effect in the drain line. If the drain line dips below the pump, water weight can create a siphon, causing the pump to run dry and make noise. Install drain line correctly to prevent this. |
| LED lights flash (5x on startup) | This is the normal startup sequence. The sequence indicates if the alarm is configured for Default Mode or Peripheral Mode. The alarm relay is user-configurable. |
| 3 red & 3 green LED flashes | This indicates a pump reconfigure code, signaling that the pump needs more power. If the pump experiences 3 consecutive long run cycles from standby to alarm mode, it indicates DIP switch settings are too low for the incoming water flow or lift. Adjust DIP switch settings to increase power. This code appears only after 3 consecutive long run cycles that entered alarm mode. |
Maintenance
Water filter maintenance:
Regular cleaning/replacement of the water filter prolongs pump life by preventing debris entry. Cleaning or replacing the filter is recommended at least every 12 months. In environments with high dust, smoke, cooking oils, or algae growth, clean/replace every 3 months. To clean/replace, remove the filter from the water sensor body, wash with cold water, and reinsert between the sensor body retaining flanges.
Change alarm relay fuse:
WARNING: Isolate power first.
The alarm relay fuse is a TxxAH250V type, with a maximum rating of 6.3A.
Replacement Parts and Accessories
- Stop-Siphon Device, 4 pcs. (Part No 3004065)
- Fuses 5x20 6.3A, 10pcs. (Part No 3004180)
- Plastic tube 6 mm (1/4"), minimum 30 meters (Part No 4679160)
- Filter for condensate water (Part No 4678597)
- Filter, 4 pcs. (Part No 3004063)
- Star tube with Stop-Siphon device (Part No 3004087)
- Spare sensor for COMBI (Part No 3004113)
Flow Rate Performance
The document includes a detailed table showing corrected flow rates (in Liters per Hour - L/Hr) based on installation parameters such as suction lift, discharge rise, and total tubing length. A conversion formula is provided: L/Hr. x 0.264 = US Gallons/Hr.
Example Data Points from the Table:
- With 0.0m suction lift and 0m discharge rise, the flow rate is 42 L/Hr.
- With 1.0m suction lift and 5m discharge rise, the flow rate is 30 L/Hr.
- With 3.0m suction lift and 10m discharge rise, the flow rate is 15 L/Hr.
- The table covers suction lifts up to 3.0m and discharge rises up to 20m, with total lengths up to 30m.
REFCO Universal Condensate Pump
REFCO Manufacturing Ltd. | Acknowledged globally | REFCO Manufacturing (US) Inc.
