Vending MachinesCombination B
Wittern Group 3650 (Futura) Vending Machine Manual
Setup, everyday use, maintenance and troubleshooting for the 136-item closed-front combination vending machine, with verified specifications.
- Capacity136 items
- ClassCombination B
- Energy use2.08 kWh/day
- Est. yearly cost$129
About the Wittern Group 3650 (Futura)
The Wittern Group 3650 (Futura) is a 136-item closed-front combination vending machine certified under the ENERGY STAR program. Its DOE equipment class is Combination B: a combination machine with refrigerated and non-refrigerated sections and less than 25% transparent front area.
The machine holds up to 136 items and has 10.2 cu. ft. of refrigerated volume. It is rated for indoor installation only.
Rated energy use is 2.08 kWh per day, about 759 kWh a year. That is lower than 63% of the 17 vending machine models in our database. It includes an accessory low-power mode to cut consumption during quiet periods.
The refrigeration system uses R-290 (propane), a natural refrigerant with a global-warming potential (GWP) of 3.
Specifications
| Brand | Wittern Group |
|---|---|
| Model number | 3650 (Futura) |
| Model name / series | Futura |
| Equipment class | Combination B |
| Platform model number | 3650 |
| Vendible capacity | 136 items |
| Refrigerated volume | 10.2 cu. ft. |
| Daily energy use | 2.08 kWh/day |
| Annual energy use (daily × 365) | 759 kWh/yr |
| Door type | Closed Front |
| Location rating | Indoor Only |
| Refrigerant | R-290 (propane), GWP 3 |
| Accessory low-power mode | Yes |
| Refrigeration low-power mode | No |
| Rebuilt machine | No |
Safety information
- Never rock, tilt or shake a vending machine to dislodge a product. Vending machines are extremely heavy and can tip over, causing serious or fatal injuries. Post this warning on or near the machine.
- Install and stabilize the machine as the manufacturer directs, on a level floor; use any anti-tip brackets or anchoring supplied.
- Connect the machine to a properly grounded receptacle on a circuit that matches the nameplate rating. Do not use extension cords, adapters or multi-outlet strips.
- Move the machine only with equipment rated for its weight, with trained personnel, and with the door closed and locked.
- Disconnect power before cleaning the condenser, replacing lamps or servicing any electrical component.
- Keep door keys secure and the door locked whenever the machine is unattended.
- This machine is rated for indoor use only. Do not install it outdoors or where it can be exposed to rain or sprinklers.
Installation and first-time setup
Check the machine's dimensions and weight on the manufacturer's specification sheet and measure every doorway, elevator and corridor on the delivery route before the machine arrives.
- Choose the location
Select a level, solid floor near a suitable receptacle, out of direct sunlight and away from heat sources. Leave the clearance behind and around the machine that the manual specifies so the condenser can reject heat.
- Unpack and inspect
Remove packaging and shipping blocks, including any inside the cabinet, and check for transit damage.
- Let it stand
If the machine was laid down or tilted heavily in transit, let it stand upright for the period stated in the manual before plugging it in so compressor oil can return to the compressor.
- Level and stabilize
Adjust the leveling legs so the cabinet is level and stable, and install any anti-tip hardware. A level cabinet also helps products drop and doors seal properly.
- Power on and pull down
Plug the machine in and let the refrigeration system run until the cabinet reaches temperature before relying on it to vend cold product. Products loaded warm take longer to chill.
- Set up payment and pricing
Install and test the coin mechanism, bill validator or cashless reader according to their instructions, then set prices and selections in the controller's service menu.
- Load and test
Load products into the correct columns or spirals, placing beverages and other temperature-sensitive items in the refrigerated section, then test-vend each selection.
Using your vending machine
Loading products
- Rotate stock: place fresh product behind or under existing product so older items vend first.
- Load each column only with the package size it is set up for, and do not overfill — jams are the most common cause of service calls.
- Loading large amounts of warm product at once increases run time; where possible, load pre-chilled product or allow extra time for pull-down.
- Keep perishable and temperature-sensitive products out of the non-refrigerated section.
Temperature settings
Set the cabinet temperature using the controller as described in the manual. Cold-drink machines are commonly set to deliver product in the mid-30s °F (about 2 °C); colder settings increase energy use and can freeze product. Check temperature with a thermometer in a product container rather than relying on air temperature.
Low-power modes
- Accessory low-power mode dims or switches off lighting and other accessories during periods you schedule (or, on some models, when no one is nearby).
- Program the schedules to match the building's actual hours — for example, nights and weekends in an office — so the machine is at full readiness when people are present.
Care and maintenance
| When | What to do |
|---|---|
| Every service visit | Wipe spills inside the cabinet and on the delivery bin, check the temperature reading and look for error messages on the controller. |
| Every month | Clean the exterior and door gasket. Check that the gasket seals all the way around. |
| Every 1–3 months | Disconnect power and clean dust and lint from the condenser coil and grille with a brush or vacuum; dusty or high-traffic sites need more frequent cleaning. |
| Every 6 months | Check the condensate drain and evaporation pan, clean the payment devices and confirm low-power schedules are still correct. |
| Every year | Have a qualified technician check refrigeration performance, fan motors, wiring and the vend mechanism. |
Troubleshooting
Most vending problems are caused by loading, dirty condensers or settings. Check these first before calling a technician.
| Problem | Possible cause | What to try |
|---|---|---|
| Product not cold enough | Recently loaded with warm product; refrigeration low-power mode recovering; dirty condenser; blocked airflow; door not sealing. | Allow pull-down time; check the low-power schedule; clean the condenser; restore clearances; inspect the gasket. |
| Compressor runs constantly | Dirty condenser coil; high room temperature; door gasket leak. | Clean the coil; improve ventilation; replace a damaged gasket. |
| Frost or ice buildup | Door left ajar or gasket leak; defrost problem. | Check the door closes and latches; inspect the gasket; call service if ice returns. |
| Lights off | Accessory low-power mode active; failed lamp or LED driver. | Check the lighting schedule in the service menu; replace the lighting component. |
| Product jams or does not vend | Wrong product size for the column; overfilled column; mechanism out of adjustment. | Reload with the correct product and count; adjust the column or spiral as the manual describes. |
| Bills or coins rejected | Dirty validator or coin path; payment device disabled in the menu. | Clean the validator and coin path; check payment settings. |
| Water on the floor | Blocked condensate drain or overflowing evaporation pan. | Clear the drain and check the pan and its heater. |
| Error code displayed | Brand-specific diagnostic code. | Error codes are not standardized; consult the code table in your manufacturer's manual. |
Energy use and running costs
The Wittern Group 3650 (Futura) is rated at 2.08 kWh per day under the DOE test procedure for refrigerated beverage vending machines. Running 24 hours a day all year, that is about 759 kWh — roughly $129 per year, or $10.75 per month, at $0.17 per kWh.
Spread across its 136-item capacity, that is about 1.53 kWh per day for every 100 items of capacity — a useful way to compare machines of different sizes within the same class.
Actual consumption depends on room temperature, how often the machine is restocked with warm product, vend frequency and lighting schedules.
Frequently asked questions
How many items does the Wittern Group 3650 (Futura) hold?
It has a vendible capacity of 136 items and 10.2 cu. ft. of refrigerated volume. Actual count depends on package sizes and column configuration.
How much electricity does the Wittern Group 3650 (Futura) use?
It is rated at 2.08 kWh per day, about 759 kWh a year, which costs roughly $129 annually at $0.17/kWh.
What does Combination B mean for the Wittern Group 3650 (Futura)?
Combination B is a U.S. Department of Energy equipment class for refrigerated beverage vending machines. It identifies a combination machine with refrigerated and non-refrigerated sections and less than 25% transparent front area. Energy limits are set separately for each class, so compare energy use only among machines of the same class.
Can the Wittern Group 3650 (Futura) be installed outdoors?
No. It is rated for indoor use only.
What refrigerant does the Wittern Group 3650 (Futura) use?
The certification lists R-290 (propane) with a global-warming potential of 3. Propane is flammable, so service must be performed by technicians trained in hydrocarbon refrigerants.
Does the Wittern Group 3650 (Futura) have an energy-saving mode?
Yes. It has an accessory low-power mode, which can be scheduled for nights, weekends or other low-traffic periods.
Sources and disclaimer
Specifications on this page come from the ENERGY STAR certified vending machines dataset published by the U.S. Environmental Protection Agency (record certified February 1, 2026), retrieved October 7, 2026.
The setup, operating, maintenance and troubleshooting guidance is written by ManualHarbor's editors for this specific product type and configuration. It is an independent guide — not a reproduction of the manufacturer's manual — and ManualHarbor is not affiliated with Wittern Group. Always follow the safety instructions, installation requirements and warranty terms supplied with your unit, and contact Wittern Group or an authorized service provider for warranty repairs and replacement parts.
Running-cost figures use assumed U.S. average utility prices and are estimates for comparison only. See our editorial methodology for details.