Price FFU series Installation And Service Manual page 20

FAN FILTER UNIT
INSTALLATION & SERVICE INSTRUCTIONS
STEP 2: Calculate number of turns required based on difference between factory set point and desired set point using the
following chart.
Example:
HEPA filter with desired set point of 0.9 in w.g.
Number of turns at 0.9 in w.g. = 4
Number of turns at factory set point of 0.6 in w.g. = 2.2
Number of turns to field set = 4 – 2.2 = 1.8 (approximately)
NOTE: Maximum available pressure setting is 1.0" w.g. Do not exceed 4 ½ turns (total).
STEP 3: Turn screw clockwise the number of turns calculated above. You will need a 1.5mm hex Allen wrench
STEP 4: To check filter pressure set point and/or to fine tune, insert Magnehelic gauge into the static pressure port (located along
knife edge of diffuser – diffuser face must be removed to access).
STEP 5: Using an obstruction (piece of cardboard or equivalent), slowly increasing pressure on the unit by blocking off more and
more of the diffuser face until the LED turns from green to yellow.
STEP 6: Take pressure measurement at point the LED changed color and rotate the adjustment screw until desired pressure set
point is reached.
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FAN FILTER UNIT - Manual | priceindustries.com
Table 2. Set Point Adjustment
FIGURE 10: RSR FILTER LED SET POINT ADJUSTMENT.
1.00
1.00
0.90
0.90
0.80
0.80
0.70
0.70
0.60
0.60
0.50
0.50
0.40
0.40
0.30
0.30
0.20
0.20
0.10
0.10
0.00
0.00
0 1
0 1
Turns of Set Point Adjustment Screw
Turns of Set Point Adjustment Screw
(from starting point at 0.25" w.g.)
(from starting point at 0.25" w.g.)
2 3 4
2 3 4
5
5