Air-Vac DRS25 practical field guide

An equipment reference for operation, process development, preventive maintenance and fault isolation. Start with the safety and configuration notes, then use the contents list to jump to the task or symptom you need.

Source and review: Adapted from the ChatGPT guide supplied for the Academy, originally written on October 3, 2026. Edited and checked against Air-Vac documentation on October 5, 2026. The manufacturer's online file is named DRS25_UserManual_R7a.pdf; its internal title/contents page identifies 0025.00.902, Rev 07.00, April 2023.

Before you use this guide

This is a reading and troubleshooting aid, not an approved maintenance procedure, thermal recipe or authorization to service a machine. Use the manual, schematics and approved work instructions for your serial number, options, installed software, tooling and assembly revision. The older 0025.00.901 manual and different versions of 0025.00.902 are not interchangeable.

Trained operators may perform the checks and tasks assigned by their local procedures. Qualified service personnel handle cabinet access, electrical measurements, fuse or relay replacement, pneumatic service, calibration and mechanical adjustments. Process development belongs to the authorized process engineer. Air-Vac requires training for operation and maintenance; its safety section directs disconnection of main power before service. User manual, §§1.4–1.4.2

• Keep hands clear of the powered nozzle and vision mechanisms. Let heated parts cool; use the supplied nozzle handling tool and a heat-safe stand for hot tooling.
• Use the facility's approved energy-isolation procedure before service. Isolate electrical and pneumatic supplies, release stored pressure as the procedure requires, and verify a safe energy state. An E-stop or software stop does not establish isolation.
• Do not bypass interlocks, temperature limits or safety software. Stop and escalate unexplained alarms, damaged tooling, uncontrolled motion, fumes, contamination or repeated process failures.
• Use fume extraction and the solder/flux supplier's safety data sheet, handling, PPE and disposal instructions. Flux products can present health or fire hazards. Observe ESD precautions when handling boards or internal machine electronics.
• Resistance, continuity and fuse checks require isolation and verified de-energization. Energized voltage/relay diagnostics require qualified electrical personnel and a specifically approved energized-work procedure. This guide gives no live-probing instructions.

1. What the DRS25 does

The DRS25 combines component removal, site cleaning where fitted, component preparation/alignment and replacement/reflow. It coordinates upper hot-gas heating and flow, bottom preheat, nozzle motion, vacuum, placement force and cooling. Closed-loop heater and flow control improve repeatability; they do not prove that every solder joint has reached the required temperature.

Air-Vac's product page describes a 1000 W upper heater, a 5000 W two-zone 16 × 16 inch preheater and eight programmable thermocouple channels for the listed standard configuration. These describe that configuration, not every DRS25 in service. Verify the installed equipment. Product overview

2. Major assemblies

See the user manual's getting-started and operator-training chapters and the product overview. The IR board-temperature sensor and site-clean equipment are options; do not assume they are installed.

3. Facility requirements and configuration

Have installation and supply adequacy verified by Air-Vac or authorized facilities/service personnel. Read the machine nameplate and serial-specific installation documentation before connecting or changing a supply.

The linked manual's §2.1 lists a three-phase electrical configuration. Other machine vintages/configurations can differ. Do not select wiring, a plug, fuse or transformer from this guide.

Facility gas supply, regulated machine inlet pressure, pressure under flow and nozzle flow are different quantities. The linked manual contains 90–130 psi facility-supply figures, an 80 psi regulator reference in verification/troubleshooting, and other pressure figures in maintenance. They are not one universal setpoint. Obtain the applicable requirements from Air-Vac when the machine documents disagree. Check both supply connections and pressure during the prescribed operating conditions; static pressure alone does not prove adequate flow. User manual, §§2.1, 3.1, 7.4.7, 9.1.2

Use clean, dry, properly filtered gas of the specified type. Water, oil and dirt can impair valves, flow control, vacuum and heaters. Nitrogen use also needs the facility's ventilation and compressed-gas controls.

4. Before operating

Use the approved pre-use checklist:

1. Confirm the correct assembly revision, component, alloy, nozzle and validated program.
2. Inspect the nozzle, cup/O-ring, accessible tubing and site-clean tooling; report damage or contamination.
3. Support and secure the PCB, allowing thermal expansion and clearing underside components.
4. Verify supplies, extraction and machine readiness as specified. Do not operate with unexplained alarms or suspected leaks.
5. Check the required board-temperature sensor/thermocouples and their assigned channels.
6. Confirm alignment, clearances, cooling and the approved inspection/acceptance plan.

A functioning machine can still damage an assembly when given the wrong program. User manual, chapter 5

5. Developing a thermal profile

For an authorized process engineer, Control → Profile Tutor in the documented software opens the profiling workflow. Select an appropriate master template, instrument a representative development assembly, analyze the result, build the process and validate it before production use. A generated profile is a starting point, not automatic process approval. User manual, §§4.0.1–4.0.3

Measure the board and relevant solder-joint/package locations. The manual describes fine K-type thermocouples, multiple measurements under larger BGAs, and an illustrated top-of-device thermocouple secured with copper tape covered by Kapton. Assign channels from the actual procedure/profile: the manual shows different assignments in its text and illustrated example, so “TC2 always measures the package top” is incorrect. Attachment quality and sensor location affect readings. Any destructive instrumentation belongs on an approved development/sacrificial assembly, not an unapproved production board.

6. Understanding the profile

Heater setpoint, package-top temperature and solder-joint temperature are different measurements. Do not use a generic temperature/time recipe or one thermocouple as proof that the whole device is acceptable. User manual, chapter 4

7. Component removal

Fit the correct tooling, support and position the PCB, load the validated removal program and follow its prompts. In the documented automatic process, the vacuum sensor detects contact with the BGA and stops the downward Z move; a programmed relative lift follows. Monitor the process from a safe position. User manual, §5.3

If the component resists removal, stop using the approved stop sequence; do not pull harder or increase lift force. Have the engineer check thermal evidence, nozzle centering, preheat, alloy, thermal mass, vacuum, underfill/adhesive and mechanical retention. Vacuum sensing does not independently certify complete solder release.

8. Site cleaning

Where installed, the normal site-clean system uses heated gas, a vacuum tip and vacuum-based height sensing to remove residual solder while avoiding pad contact. It still needs correct tooling, a clean vacuum path, the approved program and operator control. Air-Vac also describes micro-component contact tips; the non-contact description does not apply to every option. User manual, §§1.3.1, 5.4; product overview

Inspect residual solder, pads, mask, contamination and debris against the approved acceptance criteria. A clogged-tool alarm needs the specified cleaning procedure or service attention, not a bypass of its detection threshold. Handle hot tools with the supplied tool; do not lay a hot site-clean nozzle on its side where solder may clog it.

9. Replacement and reflow

Inspect the prepared site; verify component identity, orientation and condition; apply the approved flux/paste process; pick up and align the component; then follow the validated placement/reflow program. Check board support and the specified placement force. Complete the programmed cooling and required post-rework inspection/electrical verification. User manual, §5.5

Keep hands off the machine and carrier during force-controlled placement: Air-Vac warns that external pressure can trigger premature vacuum release and misalignment. Do not remove the board before the approved handling condition. Self-centering during reflow cannot substitute for correct alignment or final acceptance, especially for hidden BGA joints.

10. Alignment technique

Begin at a magnification that shows the device and compare opposite corners. Use X/Y for translation and theta for rotation, then recheck at higher magnification. A mismatch at diagonal corners can indicate rotation, but also board/package distortion or vision setup error; do not assume theta is the only cause. Recheck registration after adjustments and lock the carrier as the procedure requires. Follow the specified microscope/vision clearance position; the documented alignment sequence calls for the microscope at its highest position. User manual, §§3.3, 5.5

11. Daily preventive maintenance

The maintenance checklist in §9.0 lists cleaning fallen parts from the carrier area, wiping painted surfaces and reporting problems. Inspect accessible tooling and cups as assigned by the local checklist; remove worn or contaminated parts from use when found. Cleaning agents and access boundaries must follow the applicable instructions. User manual, §§5.8, 9.0

12. Monthly maintenance and records

The linked manual's §9.0 monthly list covers optics, flux on the table/arms/rails and the specified light-oil film on X/Y rails. Heater/flow verification and filter replacement appear in other interval groups; see section 33. The operator schedule in §5.8 also differs from the maintenance schedule. Have the facility adopt a controlled schedule for its machine and use conditions; do not combine conflicting lists silently.

Record date, machine identity, procedure revision, observed condition, instrument identity where relevant, measured result, applicable limit, action and person performing it. Preserve the distinction between verification, calibration and repair. User manual, §§5.8, 9.0–9.1.1

13. Nozzle-flow verification

Use the prescribed flow meter, pressure conditions and setup. The manual distinguishes flow-controller verification from flow-sensor/display verification. Agreement with the on-screen value alone is not an independent flow check. Its §3.1 table uses 2.75 scfm as the 100% reference for that documented configuration; it is not a universal process flow or permission to alter offsets.

Only authorized personnel should perform the full procedure. Fully seat hoses and restore the upper-heater connection afterward: Air-Vac specifically warns that running the heater with its supply hose disconnected can destroy the element. User manual, §§3.1.1–3.1.2

14. Temperature and other calibration

The documented nozzle-heater utility is under Setup → Adjustments → Nozzle Heater. Use the full procedure and the specified NCAL1 tooling, channel and starting conditions. Air-Vac says not to adjust individual calibration points; changes to the automatic adjustment logic require factory technical guidance. A completed utility is not verification that an assembly's joints follow its validated thermal profile. User manual, §§3.2, 6.6.3.3

The material checklist includes FLM5, NCAL1, vision-verification tooling and a force weight. Confirm the kit and instrument status for your machine. Do not improvise force, vision or IR-sensor adjustments from this summary.

15. Vacuum-system maintenance

Inspect accessible cups, seals, tubing and filters for wear, leaks, blockage and contamination. Use the designated filter for each location; the manual lists both F1AE and 0001.11.101, so they must not be treated as interchangeable. §9.5 describes keeping vacuum glass tubes clean and replacing their specified felt filters as needed. Excess dirt or moisture calls for investigation of the incoming gas supply. Isolate pressure before opening or servicing pneumatic parts under the approved procedure. User manual, §§1.2, 9.5

16. Carrier bearings and rails

Check for binding, uneven movement or play and report changes. Cleaning, lubrication and preload adjustment belong to the applicable maintenance procedure. §9.0 lists bearing-play checks in the yearly group; repair/adjustment is condition-dependent. The manual's approximate 1/16 inch Y-bearing check must be interpreted in its illustrated procedure, not as a universal acceptance tolerance. Do not overtighten bearings. User manual, §§9.0–9.2

17. Carrier and preheater leveling

Leveling is a service/verification task using the specified nozzle, glass plate, gauge and setup. Carrier leveling and preheater leveling are distinct procedures. Do not infer adjustment direction, clearance or warm-up settings from this guide; use §§9.3–9.4 and trained support. Excessive fastener tightening can distort the preheater mounting plate. User manual

18. Z-axis belt

Jerky motion, changed pickup position, backlash or noise can justify inspection of the belt and drive, but do not prove a belt fault. Cabinet/casting removal and belt adjustment require qualified service and energy isolation. Use the manufacturer's measured adjustment method; do not tighten by feel or apply a generic belt tension. User manual, §9.6

19. Nozzle clamp and vacuum tube

The clamp must hold the nozzle properly. Wobble, poor opening/closing or contamination needs maintenance attention. Rebuilding the clamp involves the heater assembly and ordered parts; follow the illustrated, power-disconnected procedure. Apply only the specified lubricant at its designated points, keeping gas/vacuum passages clear. STB7 is listed for vacuum-port/tube cleaning; it is not a general instruction to brush delicate tooling. User manual, §§1.2, 9.1.1–9.1.2

20. Upper heater does not heat

Operator checks: Record the alarm, program and event; confirm that the approved event requests heat and that the required supplies are available. Stop for an unexplained or persistent failure.

Qualified service: The manufacturer's troubleshooting list proceeds to supply voltage, the designated fuse and heater-element checks. Its troubleshooting text gives 52 ohms; the maintenance check gives 53 ±5 ohms at specified terminals. Neither is a generic test limit for every fitted heater. Match the element, terminals, schematic and controlled procedure. No live test sequence is supplied here. User manual, §§7.0.1, 9.7; separate troubleshooting chapter, §8.0.1

Use observations to narrow hypotheses: no heat command suggests a program/control question; missing flow suggests supply/control/interlock questions; adequate indicated flow with no heat still leaves heater, wiring, power/control and sensor possibilities. A heater voltage reading alone does not prove usable power or identify the failed part.

21. Temperature communications alarm

Capture the exact alarm and safely stop the process. Air-Vac lists temperature-control cable checks, computer restart and setup verification. Restart only after the machine and assembly are in a safe state, following the normal shutdown/startup procedure. Qualified service should handle internal connections or parameter changes. Persistent communication faults need Air-Vac support. User manual, §§7.0.2, 7.4.2

22. No or low nozzle flow

Check accessible supply connections, gauges and visible restrictions under the approved operator procedure. Distinguish loss of supply pressure from a flow alarm or calibration problem. Do not adopt an 80 psi setting without the applicable machine procedure; see section 3 above.

Qualified service can trace supply → regulation/filtration → valves/controller → heater/nozzle, checking the relevant fuse and components against the machine schematic. F6 in the published troubleshooting list is a locator for that configuration, not a universal fuse assignment or replacement rating. User manual, §§7.1, 7.4.6–7.4.7

23. Nozzle will not pick up a component

Air-Vac's first checks are the nozzle vacuum filter and the worn/missing vacuum cup. After safely stopping and cooling, check accessible tooling condition and correct fit. Escalate suspected tubing, valve, pump or sensing problems to qualified service. User manual, §7.2

Any vacuum-isolation test must use the approved fixture/method and a safe machine state. Keep hands away from hot or powered tooling; do not use a finger to block the nozzle.

24. No motion

Keep clear; capture the alarm and stop safely. Verify the expected machine state and authorized operator controls. Do not release an E-stop or restart merely to force motion without resolving why the machine stopped. The manufacturer lists computer restart for some communication faults, followed by connection checks and technical support. Internal drives, wiring, belts and sensors require qualified service. User manual, §§7.3, 7.4.2

One failed axis suggests axis-specific causes; multiple failed functions suggest a shared supply, control, communication or enable issue. These are diagnostic leads, not proof of a component failure.

25. Component lifts too early

Stop and hold the assembly for assessment. Have the engineer examine profile timing, vacuum/motion events, thermal uniformity, actual joint measurements, tooling and possible mechanical restraint. Do not change vacuum thresholds or force to conceal incomplete reflow. User manual, chapters 4–5

26. Component refuses to lift

Check the approved profile and thermal evidence, nozzle fit/centering, vacuum tooling, board support, alloy and any underfill, adhesive or retention. Do not increase mechanical lift force or manually pull the package. The process must be assessed before another attempt; record exposure and obtain the required disposition for the assembly. User manual, chapters 4–5

27. Component shifts during placement

Possible causes include alignment/vision error, incorrect pickup, force, vacuum timing, flux/paste application, package condition and board movement or distortion. Compare evidence with the validated setup; an apparent shift is not proof that the force setting is the cause. Hold the assembly for the required inspection and engineering disposition.

28. Repeated solder bridges

Treat paste quantity/application, registration, placement, site condition and the thermal process as hypotheses. Inspect against the controlled criteria and localize the fault before altering the process. Excessive placement force may affect solder distribution; bridges alone do not establish it. Do not tune a validated recipe by trial and error on production assemblies.

29. Opens after reflow

Investigate joint-temperature distribution, process timing, material/flux condition, paste coverage, board/package deformation and alignment. A package-top reading or one thermocouple cannot prove all joints reached acceptable conditions. Use the approved hidden-joint inspection and electrical tests where applicable. These are troubleshooting hypotheses, not a manufacturer fault-code table.

30. Board warping

Stop and have the engineer assess support, clamping/expansion, preheat uniformity, ramp and package/assembly limits. Do not force a hot board flat or add supports that obstruct heating or contact underside components. Warpage may involve the assembly as well as the machine; establish the cause before rework continues.

31. A validated profile behaves differently

Compare the actual program/revision, assembly/material changes, nozzle, sensor attachment, flow, incoming supplies, preheater performance, support and starting conditions with the validated setup. A sudden change can come from machine, tooling, measurement or assembly/process inputs. Verify those changes before editing parameters, and route any recipe change through revalidation.

32. Spares and tooling

Air-Vac's product page lists recommended spare-parts kit 0025.00.040 with a heater element, solid-state relay, vacuum filters, tubing and nozzle O-rings. The manufacturer's store listing uses 0025-00-040 and describes different contents. Confirm the exact serial-compatible contents with Air-Vac before ordering; do not assume either list describes the kit supplied for your machine. Cups, site-clean filters and calibration accessories have their own entries in the manual's material list. Product overview; user manual, §1.2

Keep approved spares identified by machine/part revision. Air-Vac calls for original spare parts. A similar-looking fuse, heater, filter or seal is not evidence of equivalence.

33. Build a controlled PM schedule

Use this as a routing summary of §9.0 of the linked manual, not an independent shop schedule:

Do not wait for a calendar interval when a fault or worn part is found. §5.8 has a different operator cleaning schedule, and §9.0 permits adjustment for use/environment. Resolve the applicable schedule through Air-Vac and the facility's maintenance/calibration/QMS requirements.

34. A useful fault-isolation model

Separate pneumatics, vacuum, thermal, motion, control and process. Record which functions still work, which fail and the exact event/alarm. A shared failure can point toward a common supply/control path; one failed function can narrow the search. This is a reasoning aid derived from the original guide, not an approved test sequence. Escalate with evidence instead of swapping parts indiscriminately.

35. Actions to avoid

• Do not compensate for a failing machine by changing a validated profile.
• Do not pull a package before confirmed release or increase lift force to overcome resistance.
• Do not run with damaged tooling, inadequate supports, contaminated gas or unresolved alarms.
• Do not bypass interlocks, overload bearings, improvise lubrication or calibrate without the specified setup.
• Do not rely on a single temperature reading, self-centering or a completed automatic cycle as final acceptance.
• Do not treat electrical, pneumatic or motion service as an operator task.

36. Information to collect before escalation

Record machine serial number, installed software/options, program/revision, event/alarm, assembly/component identity, nozzle and recent changes. Collect only measurements authorized for your role and procedure.

Include the required assembly hold/disposition and what has already been checked. Contact Air-Vac for persistent temperature-limit, communications, flow or unexplained motion faults; do not repeatedly rerun a suspect process.

Factory references

• Air-Vac DRS25 user manual, online filename R7a: internal title/contents page identifies 0025.00.902, Rev 07.00, April 2023. Printed section/page numbers are preferable to PDF page indices.
• Air-Vac separate DRS25 troubleshooting chapter: titled chapter 8; similar content is chapter 7 in the linked full manual. Check document applicability and cross-references before following it.
• Air-Vac DRS25 product and options overview: configuration descriptions, automation and option distinctions; marketing descriptions do not replace machine-specific work instructions.
• Air-Vac recommended DRS25 spare-parts kit listing: verify contents and compatibility directly before ordering.

General solder-defect hypotheses in sections 25–31 are aids to investigation; they do not establish a root cause or authorize a repair. Practical validation on your machine and approval through your workplace process remain necessary.