MVT26
October 2003
Section 4
Page 75
The ambient air temperature and its ability to cool the compressor will effect the operating life of the car-
tridge. See Paragraph 4.1.6.2 for the method of calculating this adjustment factor.
The optimum place to measure the temperature is at the inlet to the final separator as this best reflects the
temperature of the air as it enters the chambers. Experience has shown that this temperature is approxi-
mately 10° F above the ambient temperature. Therefore for the purpose of calculating cartridge operating
life use the Ambient Air Temperature plus 10° F.
Form-0018, titled Air Purification Cartridge Operating Hours for recording the ambient temperature,
operating time and adjustment factor is found in Paragaph 4.1.7. It is suggested that it be copied, placed
in a protective folder and kept with the unit to record the adjusted operating hours. An example of how
this form is used is shown in Figure 4.1-6.
4.1.6.1
Calculating the Maximum Cartridge Operating Hours
1. From the purification system dataplate (See Figure 4.1-3) on the unit determine the Air Processed
(cu.ft.)
2. From the compressor unit dataplate (See Figure 4.1-2) determine the Capacity (CFM).
3. Divide the Air Processed by the Capacity to obtain the Maximum Operating Time in minutes
4. Divide the Maximum Operating Time in minutes by 60 to obtain the Maximum Operating Hours.
5. Record the answer on the Air Purification Cartridge Operating Hours form.
4.1.6.2
Calculating the Adjusted Cartridge Operating Hours
1. Using the Air Purification Cartridge Operating Hours form (FORM-0018) record the Date, Operating
Hours and Ambient Air Temperature plus 10° F.
2. Using either the graph or the chart in Figure 4.1-5 determine the Correction Factor.
3. Divide the Operating Hours by the Correction Factor and record it under the column labeled Today.
4. Add the hours recorded in Today to the previous Total and record it as the current Total.
5. When the Total approaches the Maximum Operating Hours replace the Cartridges.