SOP BCC De-Humidifier and HVAC Checks

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	Standard Operating Procedure
Subject:	SOP BCC De-Humidifier and HVAC Checks
Author:	Troy Humphrey
Approved by:	Don Warf

Contents 1 Objective 2 Scope 3 Responsibilities 4 Procedure 4.1 Quarterly 4.1.1 RHT Check 4.1.2 De-Hu Unit and Filter Inspection 4.2 Semi-Annually 4.2.1 HVAC Unit and Filter Inspection 4.3 Annually 4.3.1 De-Humidifier Annual Maintenance 4.3.2 HVAC Annual Maintenance 4.4 Documentation 5 References

Objective

The objective of this SOP is to give the reader a list of items to check quarterly, semi-annually and annually.

Scope

The scope of this procedure is limited to general checks and does not divulge into trouble shooting or repair. It is a simple guide line to be used to ensure the De-humidifiers and HVAC units are checked in a consistent and timely manner. The information gathered during these checks can be used to project when maintenance may be required.

Responsibilities

PSMFC or a contractor hired by PSMFC is responsible for performing the following checks.

Procedure

Quarterly

The following procedure should be performed every 3 months.

RHT Check

1. Remove the Vaisala HM70 calibration probe from the locker and plug it into the wall to charge.

   • If you do not have time to let the unit charge plug it in close to the RHT probes located in the Return Air duct above the PLC enclosure.

2. Using a ladder, remove the tape from the CAL port on north side of the Return Air duct.
3. Attach the probe to the HM70.
4. Insert the probe into the CAL port up to the line drawn on the probe.

   • Inserting the probe too far will damage the probe tip.

5. Turn on the HM70.
6. Cancel the 'Environmental' settings
7. Let the HM70 stabilize for 15-30 mins.
8. Record the HM70 readings on the check list.

   • Use the following form to record the data. De-Hu Check List.pdf
     

9. Record the RHT readings on the check list.

   • You can either use the readings on the PV700 or open the PLC enclosure and read the Temperature and Relative Humidity from the RHT meters. The RHT meters will toggle between temperature and Relative Humidity.

10. Remove the probe and re-tape the CAL port.
11. Turn off the HM70 and return to the case.
12. Place the case back in the locker.

De-Hu Unit and Filter Inspection

1. Remove the 4 black handled screws that hold the top cover down on the unit that is NOT running . This will give you access to the inside of the de-humidifier.

   • It should be noted that the inside of the de-humidifier is consider part of the duct work so consequently any thing that passes through the duct work (dirt, water, debris) may be present in the de-humidifier.

2. Inspect the inside of the de-humidifier. Look for:

   • Dirt
   • Water
   • Debris
   • Grease

3. Inspect the drive belt. Look for:

   • Grease
   • Cracks

4. Remove the Air Return filter.

   • The filter is located on the south end of the unit.

5. Inspect the filter.

   • If the dirt is minimal no replacement is necessary.
   • If the filter is dirty replace the filter.

   • This filter is hand cut. It should be installed with the white side down stream of the air flow.

6. Replace the lid and tighten the 4 black handled screws that hold the top cover down.
7. Remove the screws from the side of the Regen Air In duct and pull the filter towards you.

   • The filter is located on the lower east side of the unit.
   • Inspect the filter and replace as needed.

   • This filter is hand cut. If should be installed with the white side down stream of the air flow.

8. Place filter back into the unit and re-attach the filter cover.
9. Remove the outside air filter for the regen air.

   • The filter is located just inside the building on the north side of the building in line with the Regen Air In duct.
   • Inspect and replace as needed.

10. Note your findings on the following form: De-Hu Check List.pdf
    
11. Measure the amperage of the unit that IS running.

    • The amperage reading can be taken inside the relay panel using a clamp on amp meter.
    • Note if the Regen heater is on or off at the time of the measurement.
    • Compare the amp meter reading to the amp meter on the unit.

12. Remove the 4 black handled screws that hold the top cover down on the unit that IS running.
13. Removing the lid should cause the de-humidifier to to shut down and the other should start automatically. Once the other unit has started perform 1 - 10.
14. When you are done inspecting the other unit log into the PV700 and clear any interlock alarms that may have occurred during your maintenance check.

    • Navigate to the process overview page and press the LOGIN button in the upper right hand corner.
    • Touch the graphic for the unit that isn't running. If the interlocks button is blinking press it to clear it.
    • Start the unit that isn't running.

    • This will cause the unit that is running to shut down.

15. Note the Run Time hours for each unit.
16. Navigate back to the process overview page and log out.
17. The procedure is now complete.

Semi-Annually

The following checks should be performed every 6 months.

De-Hu Unit and Filter Inspection

HVAC Unit and Filter Inspection

1. Use the following form to record your findings : HVAC Check List.pdf
   
2. Inspect the filter for each unit.

   • Using a 5/16th nut driver remove the screws for the middle panel.

   • The panel holding the filter is located on the outside section of the unit.

   • Loosen the screws for the panels above and below the middle section.

3. Replace the filter if needed.
4. Replace middle panel and re-tighten the previously loosened screws.
5. Check the temperature differential for each unit.
6. Use the thermostat to change to heating.

   • You may have to raise the temperature set point to get the heater to turn on.

7. Check the temperature differential between supply and return ducts.

   • Using a temperature gun point it at the supply duct (top duct) and note the temperature.

   • This temperature should be between 120 and 150 Deg F.

   • Using a temperature gun point it at the return duct (bottom duct) and note the temperature.

   • This temperature should be close to 70 Deg F.

8. Use the thermostat to switch to cooling.

   • You may have to lower the temperature set point to get the AC to turn on.
   • It should be noted that the compressor for cooling has a 5 min time delay to protect the compressor. The AC has to be off for 5 Min's before it will come on again.

9. Check the temperature differential between supply and return ducts.

   • Using a temperature gun point it at the supply duct and note the temperature.
   • Using a temperature gun point it at the return duct and note the temperature.

10. The cooling temperature differential should be 10 to 20 Deg F difference from supply to return. The outside air temperature can impact this differential.

Annually

The following checks should be performed every 12 months in addition to and in conjunction with the previously described checks.

De-Hu Unit and Filter Inspection
HVAC Unit and Filter Inspection

De-Humidifier Annual Maintenance

1. Remove power from the unit that is not running.
2. Remove the Air Return filter and Regen Air In filter.
3. Inspect all the internal components.
4. The following items should be blown out with compressed air and cleaned with a vacuum cleaner:

   • Rotor motor and belt transmission
   • Fans
   • Electric equipment
   • Regeneration heater battery
   • Access panels and seals.
   • CAUTION:THE DESICCANT WHEEL IS VERY FRAGIL! CARE SHOULD BE TAKEN TO AVOID APPLYING HIGH PRESSURE AIR DIRECTLY TO THE DESICCANT WHEEL!

5. Wipe down any dirt or grease build up.
6. Check the rotor radial silicone sealing for wear.
7. Replace the Air Return filter.
8. Replace the Regen Air In filter.
9. Replace the Outside Air filter for the Regen Air In.
10. Inspect the desiccant wheel for dirt and grease. If it is determined that it should be removed and washed it is recommended that a DST engineer is consulted and that the procedure laid out in the De-humidifier manual is followed. This should be done as a last resort.
11. Re-assemble the unit and return power to the unit.
12. Switch control over to the unit previously inspected and perform the same step on the remaining unit.

HVAC Annual Maintenance

1. A qualified HVAC technician should use the following form HVAC Check List.pdf
   
2. to check for:

   • Supply Voltage
   • Compressor amp draw
   • Blower motor amp draw
   • Condenser motor amp draw
   • Liquid Line Pressure / Temperature
   • Suctions Line Pressure / Temperature
   • Blower Motor Belt

3. Inspect the fan blades for dirt build up, clean if needed.
4. Inspect the liquid lines for corrosion and repair if needed.
5. Check internal components.
6. Replace filters.

Documentation

The check list for the De-Humidifers should be filled out, returned and archived into BCC De-Humidifer Maintenance Check Archive.

The check list for the HVAC systems should be filled out, returned and archived into BCC HVAC Maintenance Check Archive.

References

Contact PSMFC at (509) 735-2773

Name	Extension
Don Warf	1
Scott Livingston	2
Darren Chase	3
Alan Brower	4
Troy Humphrey	5

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Categories: SOP | Troy