MIXBOX-A Automatic Mixing Box, Pneumatic or Electric - Annual

                                                      Man Hours 1
Special Instructions:

1.  Review manufacturer's specifications.

Items to Check & Initial Completion:

1. ___ Check to see that the operating control thermostat activates
       the damper per design specifications.  If not, recalibrate.  Replace if it
       is defective with the same type action (direct or reverse action)and
       temperature range.
2. ___ Check damper linkage for tightness or damage.  Lightly oil moving parts.
3. ___ Inspect dampers for free movement in mixing box.  Replace felt or other
       type seals as required.
4. ___ Inspect mixing box and hot and cold connecting ducts for air leaks.
       Correct leaks with duct tape or tighten connections, as required.
5. ___ Inspect damper actuators for tightness to mounting brackets.
6. ___ Tighten electrical connections to servo-motors, and test if applicable.
7. ___ If pneumatic actuator does not stroke properly, correct sticking valve
       stem or binding linkage.  Replace diaphragm or actuator if necessary.
8. ___ Inspect for air leaks around actuator and in air line between controller
       and actuator.
9. ___ Inspect thermostat for proper location and check main and branch air lines
       at thermostat for crimps, breaks, etc.  Repair if needed.

Tools & Materials:

1.  Standard Tool Kit
    Plus  Insulated pliers and screwdrivers
          Wire strippers
          Wire crimpers
          Voltmeter - Ohmmeter - Milliammeter
          Clamp on meter(volt - ohm - amp meter)
          Soldering kit
          1/8" 25' fish tape
          Burnishing tool
2.  Control drawings
3.  Calibration tools
4.  Lubricants.  Consult the Material Safety Data Sheets (MSDS) for hazardous
    ingredients and proper personal protective equipment (PPE).
5.  Duct tape
6.  Cleaning materials and equipment.  Consult the MSDS for hazardous ingredients
    and proper PPE.
7.  Safety goggles

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