Fisher EZR Instruction Manual page 13

REcOmmEndEd TyPE PRX RESTRIcTOR and damPER ScREW
PILOT TyPE
Restrictor Screw (B)
• 1 turn out (counterclockwise) from fully seated for most low flows
• 2-1/2 turns out (for flows less than 5% of maximum)
PRX/120 and
PRX/120-aP Series damper Screw (d)
• Fully out (counterclockwise) from seated for most low flows
• One turn out (for flows less than 5% of maximum)
Note: Counterclockwise adjustment of the Type PRX restrictor screw will increase proportional band. Adjustment of the restrictor screw will also cause a shift in set
point. Setpoint should be checked and adjusted following restrictor screw adjustment.
Table 10. Type PRX Pilot Adjustment Recommendations
SETTIngS FOR LOW FLOW OPERaTIOn
Figure 12. Type EZR Startup Schematic
TyPE PRX RESTRIcTOR and damPER ScREW SETTIngS
TO aVOId LOW FLOW OPERaTIOn
Restrictor Screw (B)
• Fully seated (clockwise) or full out (counterclockwise)
damper Screw (d)
• Full in (clockwise)
Type EZR
B22
13