Heller 1913 MK7 Reflow Oven With Lower Delta T

“Delta T” refers to the temperature difference across a PCB during the reflow process (top vs bottom, front vs back). A lower Delta T means more uniform heating, better solder joint quality, reduced warpage, fewer hotspots, and more predictability. The MK7 achieves very low Delta T through enhanced low-profile heater modules, improved airflow, and better uniformity.

The MK7 offers 9 heated zones in the 1809 MK7 configuration. It supports conveyor (belt) speeds up to 1.88 m/min (≈ 1880 mm/min), making it suitable for medium to high volume SMT reflow operations.

• The MK7 has an Energy Management System that can reduce electrical power and nitrogen (N₂) usage when production is idle.
• Uniform Gas Management eliminates “net flow” of nitrogen, which reduces nitrogen consumption by ~ 40%.

• New flux management systems: filters or jars to collect flux, anti-flux drips, quick-release cooling grills so parts involved in maintenance / cleaning can be accessed or exchanged without cooling down the entire oven.
• Low temperature catalyst is available in heater modules to help decompose flux residues. This helps reduce build-up and simplifies preventive maintenance (PM).

• Max standard process temperatures up to ~ 350 °C, with optional higher temperature capability.
• Temperature controller accuracy is around ±0.1 °C.

• Cooling zones are included (number depends on model) with advanced cooling module options.
• There’s a “super cooling” option for heavy or high-mass boards which can achieve cooling rates in excess of 6 °C/sec and exit temperatures below 50 °C.

• Standard max PCB width is 22″ (≈ 56 cm).
• Transport options include single-lane, dual-lane, mesh belt or chain, with centre board supports for larger boards.

• Although more efficient, lower Delta T, energy savings, and nitrogen reductions come at cost of more complex design and possibly higher upfront investment.
• Size & footprint: depending on model (e.g. 1809, 1826, etc.), the oven is quite long and heavy; facility infrastructure (power, nitrogen supply, exhaust, cooling) must be capable.
• Maintenance: while the MK7 improves PM intervals, flux management & cooling grills still require regular maintenance; features ease this but do not remove it entirely.
• For ultra-high volume or extremely dense/hybrid PCBs, profiling and setup (including tool support) remain crucial to ensure consistency despite the better uniformity.

As an authorised Yamaha partner, Hawker Richardson supplies the Heller 1913 MK7 reflow oven with Lower Delta across Australia and New Zealand. We provide on-site installation, training, servicing and technical support, with coverage spanning Melbourne, Sydney, Adelaide, Auckland, and Christchurch, and stock commonly used spare parts for fast servicing and minimal downtime.