Vmac UNDERHOOD 70 Owner's Manual
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Vmac UNDERHOOD 70 Owner's Manual

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AIR COMPRESSORS
UNDERHOOD 70 and
UNDERHOOD 150 Air Compressor
Owner's Manual
www.vmacair.com
www.vmacair.com
TM
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Summary of Contents for Vmac UNDERHOOD 70

  • Page 1 AIR COMPRESSORS UNDERHOOD 70 and UNDERHOOD 150 Air Compressor Owner’s Manual www.vmacair.com www.vmacair.com...

  • Page 3: Table Of Contents

    200 Hour / 6 Month Service UNDERHOOD 70 ....... 34...
  • Page 4 Copyright © 2020 VMAC Global Technology Inc. All Rights Reserved. These materials are provided by VMAC for informational purposes only, without representation or warranty of any kind, and VMAC shall not be liable for errors or omissions with respect to the materials. The only warranties for VMAC...

  • Page 5: General Information

    Ordering Parts To order parts, contact a VMAC dealer. The dealer will ask for the VMAC System ID (see page 11), part number, description and quantity. Locate the nearest dealer online at www.vmacair.com/dealer-locator or call 1-877-912-6605.

  • Page 6: Safety

    This symbol is used to call attention to additional instructions or special emphasis on a specific procedure. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...

  • Page 7: Safety Precautions

    Proper service and operation are important to the safety of the operator and the safe, reliable operation of the equipment. Always use genuine VMAC parts. The procedures described in this manual are effective methods of service and repair. Some procedures may require the use of special tools designed for a specific purpose.
  • Page 8 • Never adjust or attempt to make any repairs to the system while the engine is running. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 9 • Run the system at idle speed under no-load conditions for 1 minute before turning the system off, to allow system cooling and lubrication. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...

  • Page 10: Warranty

    1 October, 2015. Warranty Registration The VMAC warranty registration form is located near the back of this manual. This warranty registration form must be completed and sent to VMAC at the time of installation for any subsequent warranty claim to be considered valid.
  • Page 11 2. VMAC will provide direction for repair or replacement of the failed components. 3. If requested, failed parts must be returned to VMAC for evaluation. 4. Dealers may login to the VMAC website to view the “VMAC Labour Time Guide” (under “Agreements”) to see the allowable warranty labour times.

  • Page 12: System Specifications

    Control • Electric on/off 12 V control. Maximum Air Delivery • UNDERHOOD 70: Up to 70 cfm and 175 psi (1207 kPa). • UNDERHOOD 150: Up to 150 cfm and 175 psi (1207 kPa). Pressure Regulation • Mechanical inlet control valve which modulates flow in response to demand.

  • Page 13: Identifying Your System

    (Figure 2). V900140 A BC 123 Model number Unique identifier Production date code Revision letter Figure 2 — System ID breakdown VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...

  • Page 14: System Components

    200 psi pressure relief valve Blowdown muffler 3/4 in NPT to JIC adaptor 1/4 in oil (not included) scavenge fitting Figure 4 — AOST blowdown cap (back) VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 15 AOST) Pressure sensor (to throttle control) Pressure control (3/16 in PTFE from AOST) Figure 6 — Compressor assembly (fitting configuration may vary dependent upon specific system) VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 16 (underneath) Figure 7 — Analog throttle control OBDII Accelerator Control box, pedal transmission, Pressure Not used ground sensor Figure 8 — Digital throttle control VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 17 (UNDERHOOD 70 cooler shown) Hoses / Tubes The hoses used in VMAC compressor systems have an AQP inner liner that is compatible with VMAC compressor oil. The PTFE tubes used in VMAC systems are rated for the high temperatures VMAC compressors generate. Use of hoses or tubes other than those supplied or recommended by VMAC may cause compressor damage and may void your warranty.
  • Page 18 Monitors the park brake signal. • Monitors the clutch current. • Logs errors. • Displays error messages. • Provides 200 hour and 400 hour service reminders. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 19 Component Placement Overview Oil cooler Throttle control Compressor Control box AOST locations (varies with application) Figure 12 — General component overview (Actual installation locations may vary) VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...

  • Page 20: Operating Principles

    The second stage uses an integral coalescing element to remove the remainder of the oil from the air stream. The hot compressor oil is directed to VMAC’s liquid to liquid cooler (which is tied into the vehicle’s engine coolant system) before being returned to the compressor.
  • Page 21 OEM safety controls (if present), to prevent increasing engine rpm when certain conditions are not met. This helps to protect both the operator/ occupants, and the vehicle should the VMAC system be inadvertently activated at an inappropriate time.

  • Page 22: System Operation

    20 seconds to prevent the system from restarting under pressure. Ensure the blowdown muffler is not blocked as this may prevent the system from completing the blowdown within 30 seconds. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 23 OEM base idle. In order to activate the system again, re-engage the appropriate lockout and turn the VMAC “OFF” then “ON” via the control box. Safety features The throttle control has built in safety features that will disable the system if an unsafe condition is detected, or either of the lock out parameters is not met (the vehicle must be in “PARK”...
  • Page 24 (generally after a set length of time without operator input). As the VMAC system is designed to only operate while the vehicle is in “PARK”, some manufacturers’ shut down timers may be trigged while the VMAC is in use.

  • Page 25: Maintenance And Repair Safety

    Use only genuine VMAC parts to maintain the system. Genuine VMAC parts are designed to work with the high pressure and heat generated by the compressor. Substituting genuine VMAC parts may void the warranty and could cause equipment damage, injury, or death.

  • Page 26: General Maintenance Information

    All fasteners must be torqued to specifications. Use manufacturers’ torque values for OEM fasteners. The torque values supplied in Table 1 are intended for VMAC supplied components, or for use as a guide in the absence of a torque value provided by an OEM.
  • Page 27 Installation Manuals and Illustrated Parts Lists (IPL) The installation manual and illustrated parts list are an invaluable resource for when inspecting, diagnosing or repairing the system. The installation manuals and IPL’s are available free of charge from VMAC. VMAC Installation Manuals https://www.vmacair.com/support/manuals/ VMAC IPLs https://www.vmacair.com/support/ipl/...
  • Page 28 (on 400 hour / 1 year service) for any evidence of metal filings or contaminants; if found, flush the tank, hoses and cooler. Metal filings and/or contaminants will damage the compressor. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 29 The following maintenance schedule must be observed to maintain both the “Standard” and “Lifetime” VMAC warranties and to assure proper performance and long service life of the system. In the event of a warranty claim, VMAC may request service records.
  • Page 30 Service Kit Contents UNDERHOOD 70 200 Hour / 6 Month Service Kit P/N: A700019 400 Hour / 1 Year Service Kit (Cont.) Part # Description Part # Description A700152 Coalescing assembly 3600037 Air filter 3600054 Valve, safety, 200 psi 9200039...

  • Page 31: Regular Inspection Instructions

    Wear appropriate Personal Protective Equipment and follow all industry standard safety practices. The VMAC supplied and approved compressor oil must be used in this system. Failure to use this special oil will result in damage to the compressor and will void warranty.
  • Page 32 *UNDERHOOD 70: 10 – 15 seconds. ☐ *UNDERHOOD 150: 30 – 40 seconds. ☐ If the muffler is showing signs of blockage, contact a local VMAC dealer for a replacement. A replacement blowdown muffler is included with the VMAC 400 hour service kit.
  • Page 33 ☐ If the pressure relief valve is showing loss of functionality, contact a local VMAC dealer for a replacement. A replacement pressure relief valve is included with the VMAC 400 hour service kit.
  • Page 34 Replace the cover and secure it with the cover nut. Do not over-tighten the nut (Figure 19). Filter plate "step" Filter cover Filter element Figure 19 — Install air filter element VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 35 Ensure the hoses and tubes have not shifted and remain secured away from hot, sharp, or moving parts. If any hoses or tubes need to be replaced, see "Hoses / Tubes" on page 15 for important information related to VMAC hoses. PTFE Tubing, Loom, and Push-To-Connect Fittings •...

  • Page 36: 200 Hour / 6 Month Service Underhood 70

    Inspect the Viton® O-ring on the oil drain plug for damage, hardness or defects and replace if necessary. ☐ Install and tighten the oil drain plug. ☐ Remove the oil filter (Figure 21). VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 37 ☐ Add 4 L (1.0 USG) of VMAC compressor oil to the AOST. ☐ While adding the oil, rotate the compressor clutch clockwise (by hand, do not use power tools) to speed the process.
  • Page 38 Continue holding the “OFF” button until “CLEAR OK” appears in the display. ☐ Press the ON and OFF button at the same time to exit diagnostics mode. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...

  • Page 39: 400 Hour / 1 Year Service Underhood 70

    Inspect the Viton O-ring on the oil drain plug for damage, hardness or defects and replace if necessary. ☐ Install and tighten the oil drain plug. ☐ Remove the oil filter (Figure 23). VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 40 Remove the bolts retaining the blowdown cap. Unscrew the bolts evenly to avoid damaging the blowdown cap as the coalescing element is spring-loaded against the inside of the end cap. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 41 AOST (Figure 26). Figure 26 — Remove small spring and thimble screen VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 42 Failure to install the wave spring may cause an electric arc which could result in an explosion, tank rupture or fire. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 43 Figure 30 — Rear cap seal ☐ Install the blowdown cap Viton O-ring in the AOST (Figure 31). Figure 31 — Blowdown cap O-ring VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 44 ☐ *Continue holding the “OFF” button until “CLEAR OK” appears in the display. If the Service Reminder does not clear using the above instructions, and the VMAC System is circa 2007, see "Clearing Service Reminders on Early 2007 Systems" on page 36.

  • Page 45: 200 Hour / 6 Month Service Underhood 150

    Inspect the Viton® O-ring on the oil drain plug for damage, hardness or defects and replace if necessary. ☐ Install and tighten the oil drain plug. ☐ Remove the oil filter (Figure 32). VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 46 ☐ Add 8 L (2.1 USG) of VMAC compressor oil to the AOST. ☐ While adding the oil, rotate the compressor clutch clockwise (by hand, do not use power tools) to speed the process.
  • Page 47 *Press and hold the “OFF” button (approximately 5 seconds) until “200 HR CLEAR” appears in the display. ☐ *Continue holding the “OFF” button until “CLEAR OK” appears in the display. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...

  • Page 48: 400 Hour / 1 Year Service Underhood 150

    Inspect the Viton O-ring on the oil drain plug for damage, hardness or defects and replace if necessary. ☐ Install and tighten the oil drain plug. ☐ Remove the oil filter (Figure 34). VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 49 Remove the bolts retaining the blowdown cap. Unscrew the bolts evenly to avoid damaging the blowdown cap as the coalescing element is spring-loaded against the inside of the end cap. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 50 AOST (Figure 37). Figure 37 — Remove small spring and thimble screen VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 51 ☐ Install the spring plate, spring, and coalescing filter into the AOST (Figure 39). Spring Coalescing filter Spring plate Figure 39 — Install coalescing filter VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 52 VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 53 ☐ Add 8 L (2.1 USG) of VMAC compressor oil to the AOST. ☐ While adding the oil, rotate the compressor clutch clockwise (by hand, do not use power tools) to speed the process. ☐ Allow 5 minutes for the oil to drain into the tank, then check th oil level via the sight glass (actual level will be corrected later).

  • Page 54: Diagnostics And Trouble Shooting

    Press the “OFF” button to scroll down, press the “ON” button to scroll up. ☐ When the end is reached, “NO SVC NEEDED” will be displayed. ☐ To exit diagnostic mode, press both the “OFF” and “ON” buttons simultaneously. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 55 Disconnected clutch wire. • Faulty clutch. CLUTCH Current draw on the clutch is too • Clutch wire shorted to ground or SHORT high (above 10 A). pinched. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 56 The normal operating too low or too high • range for the DTC is Faulty or damaged between 9.8 V and 16 V. DTC. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 57 Faulty clutch stator ground. Resistance should be windings. between 2.5 Ω – 3 Ω. If outside of this range, replace the clutch. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 58 Symptom Possible Cause Corrective Action Vehicle engine speed stays at Idle-down setting is too high. Reset idle-down pressure. VMAC maximum rpm. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 59 This oil will be drawn back into the compressor upon startup. Missing, damaged, or Contact a VMAC dealer or dislodged inlet poppet O-ring. VMAC Technical Support. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 60 Engine rpm setting too low or settings for optimum compressor is activated. throttle not set correctly. operation. Throttle control not Check for proper connections. connected properly at foot pedal. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...

  • Page 61: Performance Testing And System Adjustments

    Ball valve JIC Adapters Orifice Install orifice here Figure 42 — A700052 VMAC Air Test Tool VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 62 In applications that require pressures below 150 psi, VMAC recommends leaving the maximum pressure set at 150 psi and installing a regulator downstream to regulate pressure to the desired amount.
  • Page 63 The cfm produced by the system is directly related to engine speed. The “MAX RPM” on the throttle control is set from the factory provide optimum cfm (not necessarily maximum cfm) when the throttle is engaged. See the specific VMAC installation manual for default rpm settings as it will vary dependent upon vehicle manufacture as well as the engine type and size).
  • Page 64 Figure 45 — Analog throttle control adjustments Certain VMAC systems include throttle controls with a third adjustment screw for adjusting the VMAC base idle (engine idle once maximum system air pressure is reached and engine rpm is reduced).
  • Page 65 “PARK” and fully apply the park brake. ☐ Install the VMAC test tool (P/N: A700052) (do not install any orifice). Disconnect all downstream equipment (hose reels, etc.) and connect the test tool directly to the discharge fitting on the AOST.
  • Page 66 Maximum rpm Maximum VMAC rpm can be adjusted via the “MAX RPM” ““ or “” buttons (in 50 rpm increments). On some early models, after pressing one of the buttons, the throttle will temporarily jump up to the new maximum rpm. After 4 seconds of inactivity, the throttle will store the new “Max RPM”...
  • Page 67 The DTC is now in “Idle adjust mode”. While in “Idle adjust mode” the engine speed will remain at VMAC base idle until the system is turned off. Once the system is turned on again, it will operate as normal.
  • Page 68 To perform a factory reset, turn the system on and allow the engine speed to drop to VMAC base idle (approximately 1,000 rpm). Using a paper clip (or similar object), push and hold the factory reset button for 5 seconds. All of the LED lights will illuminate for several seconds while the settings revert to their defaults.

  • Page 69: Air Receiver Tank

    The VMAC compressor system will automatically depressurize when it is shutdown, therefore the hose from the VMAC AOST to the air receiver tank must have a check valve installed; this prevents blow back and moisture from the receiver tank...

  • Page 70: Recommended Accessories

    While the compressor system will function without the following accessories, VMAC strongly recommends their use for optimal performance. See the “Accessory Product” section of the VMAC this manual on page 68 for a list of products available for purchase through VMAC.

  • Page 71: Accessory Products From Vmac

    UNDERHOOD 70 Compressor Service Kits 200 Hour or 6 Month Service Kit - Part number: A700019 Includes 5 L VMAC high performance compressor oil, oil filter, air filter, and next service due decal. 400 Hour or 1-Year Service Kit -...
  • Page 72 VMAC De-icer Kit Part number: A700031 Cold climate heater package for operating VMAC compressors in cold climates; proven at temperatures of -30 °C (-22 °F). Requires 12V DC at 10A. VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 73 Part number: A300047 Air receiver tanks are used for lowering compressor duty cycle and removing water from compressed air. Recommended for optimum operation of VMAC Hydraulic Air Compressors, VMAC Diesel Driven Air Compressors, UNDERHOOD40, UNDERHOOD70 (including Green Series Air Compressors), DTM70/ DTM70H, and VMAC Multifunction Power Systems, which include standby mode;...
  • Page 74 Notes VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 75 Notes VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 76 Notes VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...
  • Page 77 Notes VMAC - Vehicle Mounted Air Compressors VMAC Technical Support: 888-241-2289 VMAC Knowledge Base: kb.vmacair.com...

  • Page 78: Warranty Registration

    Warranty Registration This form must be fully completed and returned to VMAC at the time the vehicle is put into service. Warranty may be void if this form is not received by VMAC within 3 months of receiving the vehicle, or 200 hours of operation, whichever occurs first.
  • Page 80 Manufactured by ® 888-241-2289 tech@vmacair.com 877-740-3202 warranty@vmacair.com www.vmacair.com https://kb.vmacair.com 1333 Kipp Road, Nanaimo, B.C., V9X 1R3 Canada...

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